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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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SPDX-License-Identifier: GPL-2.0-only */#ifndef __KVM_HOST_H#define __KVM_HOST_H
#include <linux/entry-virt.h>#include <linux/types.h>#include <linux/hardirq.h>#include <linux/list.h>#include <linux/mutex.h>#include <linux/spinlock.h>#include <linux/signal.h>#include <linux/sched.h>#include <linux/sched/stat.h>#include <linux/bug.h>#include <linux/minmax.h>#include <linux/mm.h>#include <linux/mmu_notifier.h>#include <linux/preempt.h>#include <linux/msi.h>#include <linux/slab.h>#include <linux/vmalloc.h>#include <linux/rcupdate.h>#include <linux/ratelimit.h>#include <linux/err.h>#include <linux/irqflags.h>#include <linux/context_tracking.h>#include <linux/irqbypass.h>#include <linux/rcuwait.h>#include <linux/refcount.h>#include <linux/nospec.h>#include <linux/notifier.h>#include <linux/ftrace.h>#include <linux/hashtable.h>#include <linux/instrumentation.h>#include <linux/interval_tree.h>#include <linux/rbtree.h>#include <linux/xarray.h>#include <asm/signal.h>
#include <linux/kvm.h>#include <linux/kvm_para.h>
#include <linux/kvm_types.h>
#include <asm/kvm_host.h>#include <linux/kvm_dirty_ring.h>
#define __KVM_DEV_STRING(name, x) __stringify(name ## _ ## x)#define _KVM_DEV_STRING(name, x) __KVM_DEV_STRING(name, x)#define KVM_DEV_STRING(x) _KVM_DEV_STRING(KVM_DEV_NAME, x)
#ifndef KVM_MAX_VCPU_IDS#define KVM_MAX_VCPU_IDS KVM_MAX_VCPUS#endif
/* * The bit 16 ~ bit 31 of kvm_userspace_memory_region::flags are internally * used in kvm, other bits are visible for userspace which are defined in * include/uapi/linux/kvm.h. */#define KVM_MEMSLOT_INVALID (1UL << 16)#define KVM_MEMSLOT_GMEM_ONLY (1UL << 17)
/* * Bit 63 of the memslot generation number is an "update in-progress flag", * e.g. is temporarily set for the duration of kvm_swap_active_memslots(). * This flag effectively creates a unique generation number that is used to * mark cached memslot data, e.g. MMIO accesses, as potentially being stale, * i.e. may (or may not) have come from the previous memslots generation. * * This is necessary because the actual memslots update is not atomic with * respect to the generation number update. Updating the generation number * first would allow a vCPU to cache a spte from the old memslots using the * new generation number, and updating the generation number after switching * to the new memslots would allow cache hits using the old generation number * to reference the defunct memslots. * * This mechanism is used to prevent getting hits in KVM's caches while a * memslot update is in-progress, and to prevent cache hits *after* updating * the actual generation number against accesses that were inserted into the * cache *before* the memslots were updated. */#define KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS BIT_ULL(63)
/* Two fragments for cross MMIO pages. */#define KVM_MAX_MMIO_FRAGMENTS 2
#ifndef KVM_MAX_NR_ADDRESS_SPACES#define KVM_MAX_NR_ADDRESS_SPACES 1#endif
/* * For the normal pfn, the highest 12 bits should be zero, * so we can mask bit 62 ~ bit 52 to indicate the error pfn, * mask bit 63 to indicate the noslot pfn. */#define KVM_PFN_ERR_MASK (0x7ffULL << 52)#define KVM_PFN_ERR_NOSLOT_MASK (0xfffULL << 52)#define KVM_PFN_NOSLOT (0x1ULL << 63)
#define KVM_PFN_ERR_FAULT (KVM_PFN_ERR_MASK)#define KVM_PFN_ERR_HWPOISON (KVM_PFN_ERR_MASK + 1)#define KVM_PFN_ERR_RO_FAULT (KVM_PFN_ERR_MASK + 2)#define KVM_PFN_ERR_SIGPENDING (KVM_PFN_ERR_MASK + 3)#define KVM_PFN_ERR_NEEDS_IO (KVM_PFN_ERR_MASK + 4)
/* * error pfns indicate that the gfn is in slot but faild to * translate it to pfn on host. */static inline bool is_error_pfn(kvm_pfn_t pfn){ return !!(pfn & KVM_PFN_ERR_MASK);}
/* * KVM_PFN_ERR_SIGPENDING indicates that fetching the PFN was interrupted * by a pending signal. Note, the signal may or may not be fatal. */static inline bool is_sigpending_pfn(kvm_pfn_t pfn){ return pfn == KVM_PFN_ERR_SIGPENDING;}
/* * error_noslot pfns indicate that the gfn can not be * translated to pfn - it is not in slot or failed to * translate it to pfn. */static inline bool is_error_noslot_pfn(kvm_pfn_t pfn){ return !!(pfn & KVM_PFN_ERR_NOSLOT_MASK);}
/* noslot pfn indicates that the gfn is not in slot. */static inline bool is_noslot_pfn(kvm_pfn_t pfn){ return pfn == KVM_PFN_NOSLOT;}
/* * architectures with KVM_HVA_ERR_BAD other than PAGE_OFFSET (e.g. s390) * provide own defines and kvm_is_error_hva */#ifndef KVM_HVA_ERR_BAD
#define KVM_HVA_ERR_BAD (PAGE_OFFSET)#define KVM_HVA_ERR_RO_BAD (PAGE_OFFSET + PAGE_SIZE)
static inline bool kvm_is_error_hva(unsigned long addr){ return addr >= PAGE_OFFSET;}
#endif
static inline bool kvm_is_error_gpa(gpa_t gpa){ return gpa == INVALID_GPA;}
#define KVM_REQUEST_MASK GENMASK(7,0)#define KVM_REQUEST_NO_WAKEUP BIT(8)#define KVM_REQUEST_WAIT BIT(9)#define KVM_REQUEST_NO_ACTION BIT(10)/* * Architecture-independent vcpu->requests bit members * Bits 3-7 are reserved for more arch-independent bits. */#define KVM_REQ_TLB_FLUSH (0 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)#define KVM_REQ_VM_DEAD (1 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)#define KVM_REQ_UNBLOCK 2#define KVM_REQ_DIRTY_RING_SOFT_FULL 3#define KVM_REQUEST_ARCH_BASE 8
/* * KVM_REQ_OUTSIDE_GUEST_MODE exists is purely as way to force the vCPU to * OUTSIDE_GUEST_MODE. KVM_REQ_OUTSIDE_GUEST_MODE differs from a vCPU "kick" * in that it ensures the vCPU has reached OUTSIDE_GUEST_MODE before continuing * on. A kick only guarantees that the vCPU is on its way out, e.g. a previous * kick may have set vcpu->mode to EXITING_GUEST_MODE, and so there's no * guarantee the vCPU received an IPI and has actually exited guest mode. */#define KVM_REQ_OUTSIDE_GUEST_MODE (KVM_REQUEST_NO_ACTION | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_ARCH_REQ_FLAGS(nr, flags) ({ \ BUILD_BUG_ON((unsigned)(nr) >= (sizeof_field(struct kvm_vcpu, requests) * 8) - KVM_REQUEST_ARCH_BASE); \ (unsigned)(((nr) + KVM_REQUEST_ARCH_BASE) | (flags)); \})#define KVM_ARCH_REQ(nr) KVM_ARCH_REQ_FLAGS(nr, 0)
bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req, unsigned long *vcpu_bitmap);bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req);
#define KVM_USERSPACE_IRQ_SOURCE_ID 0#define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID 1#define KVM_PIT_IRQ_SOURCE_ID 2
extern struct mutex kvm_lock;extern struct list_head vm_list;
struct kvm_io_range { gpa_t addr; int len; struct kvm_io_device *dev;};
#define NR_IOBUS_DEVS 1000
struct kvm_io_bus { int dev_count; int ioeventfd_count; struct rcu_head rcu; struct kvm_io_range range[];};
enum kvm_bus { KVM_MMIO_BUS, KVM_PIO_BUS, KVM_VIRTIO_CCW_NOTIFY_BUS, KVM_FAST_MMIO_BUS, KVM_IOCSR_BUS, KVM_NR_BUSES};
int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, int len, const void *val);int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, int len, const void *val, long cookie);int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, int len, void *val);int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int len, struct kvm_io_device *dev);int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, struct kvm_io_device *dev);struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr);
#ifdef CONFIG_KVM_ASYNC_PFstruct kvm_async_pf { struct work_struct work; struct list_head link; struct list_head queue; struct kvm_vcpu *vcpu; gpa_t cr2_or_gpa; unsigned long addr; struct kvm_arch_async_pf arch; bool wakeup_all; bool notpresent_injected;};
void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu);void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu);bool kvm_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, unsigned long hva, struct kvm_arch_async_pf *arch);int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);#endif
union kvm_mmu_notifier_arg { unsigned long attributes;};
enum kvm_gfn_range_filter { KVM_FILTER_SHARED = BIT(0), KVM_FILTER_PRIVATE = BIT(1),};
struct kvm_gfn_range { struct kvm_memory_slot *slot; gfn_t start; gfn_t end; union kvm_mmu_notifier_arg arg; enum kvm_gfn_range_filter attr_filter; bool may_block; bool lockless;};bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range);bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range);bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range);
enum { OUTSIDE_GUEST_MODE, IN_GUEST_MODE, EXITING_GUEST_MODE, READING_SHADOW_PAGE_TABLES,};
struct kvm_host_map { /* * Only valid if the 'pfn' is managed by the host kernel (i.e. There is * a 'struct page' for it. When using mem= kernel parameter some memory * can be used as guest memory but they are not managed by host * kernel). */ struct page *pinned_page; struct page *page; void *hva; kvm_pfn_t pfn; kvm_pfn_t gfn; bool writable;};
/* * Used to check if the mapping is valid or not. Never use 'kvm_host_map' * directly to check for that. */static inline bool kvm_vcpu_mapped(struct kvm_host_map *map){ return !!map->hva;}
static inline bool kvm_vcpu_can_poll(ktime_t cur, ktime_t stop){ return single_task_running() && !need_resched() && ktime_before(cur, stop);}
/* * Sometimes a large or cross-page mmio needs to be broken up into separate * exits for userspace servicing. */struct kvm_mmio_fragment { gpa_t gpa; void *data; u64 val; unsigned int len;};
struct kvm_vcpu { struct kvm *kvm;#ifdef CONFIG_PREEMPT_NOTIFIERS struct preempt_notifier preempt_notifier;#endif int cpu; int vcpu_id; /* id given by userspace at creation */ int vcpu_idx; /* index into kvm->vcpu_array */ int ____srcu_idx; /* Don't use this directly. You've been warned. */#ifdef CONFIG_PROVE_RCU int srcu_depth;#endif int mode; u64 requests; unsigned long guest_debug;
struct mutex mutex; struct kvm_run *run;
#ifndef __KVM_HAVE_ARCH_WQP struct rcuwait wait;#endif struct pid *pid; rwlock_t pid_lock; int sigset_active; sigset_t sigset; unsigned int halt_poll_ns; bool valid_wakeup;
#ifdef CONFIG_HAS_IOMEM int mmio_needed; int mmio_read_completed; int mmio_is_write; int mmio_cur_fragment; int mmio_nr_fragments; struct kvm_mmio_fragment mmio_fragments[KVM_MAX_MMIO_FRAGMENTS];#endif
#ifdef CONFIG_KVM_ASYNC_PF struct { u32 queued; struct list_head queue; struct list_head done; spinlock_t lock; } async_pf;#endif
#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT /* * Cpu relax intercept or pause loop exit optimization * in_spin_loop: set when a vcpu does a pause loop exit * or cpu relax intercepted. * dy_eligible: indicates whether vcpu is eligible for directed yield. */ struct { bool in_spin_loop; bool dy_eligible; } spin_loop;#endif bool wants_to_run; bool preempted; bool ready; bool scheduled_out; struct kvm_vcpu_arch arch; struct kvm_vcpu_stat stat; char stats_id[KVM_STATS_NAME_SIZE]; struct kvm_dirty_ring dirty_ring;
/* * The most recently used memslot by this vCPU and the slots generation * for which it is valid. * No wraparound protection is needed since generations won't overflow in * thousands of years, even assuming 1M memslot operations per second. */ struct kvm_memory_slot *last_used_slot; u64 last_used_slot_gen;};
/* * Start accounting time towards a guest. * Must be called before entering guest context. */static __always_inline void guest_timing_enter_irqoff(void){ /* * This is running in ioctl context so its safe to assume that it's the * stime pending cputime to flush. */ instrumentation_begin(); vtime_account_guest_enter(); instrumentation_end();}
/* * Enter guest context and enter an RCU extended quiescent state. * * Between guest_context_enter_irqoff() and guest_context_exit_irqoff() it is * unsafe to use any code which may directly or indirectly use RCU, tracing * (including IRQ flag tracing), or lockdep. All code in this period must be * non-instrumentable. */static __always_inline void guest_context_enter_irqoff(void){ /* * KVM does not hold any references to rcu protected data when it * switches CPU into a guest mode. In fact switching to a guest mode * is very similar to exiting to userspace from rcu point of view. In * addition CPU may stay in a guest mode for quite a long time (up to * one time slice). Lets treat guest mode as quiescent state, just like * we do with user-mode execution. */ if (!context_tracking_guest_enter()) { instrumentation_begin(); rcu_virt_note_context_switch(); instrumentation_end(); }}
/* * Deprecated. Architectures should move to guest_timing_enter_irqoff() and * guest_state_enter_irqoff(). */static __always_inline void guest_enter_irqoff(void){ guest_timing_enter_irqoff(); guest_context_enter_irqoff();}
/** * guest_state_enter_irqoff - Fixup state when entering a guest * * Entry to a guest will enable interrupts, but the kernel state is interrupts * disabled when this is invoked. Also tell RCU about it. * * 1) Trace interrupts on state * 2) Invoke context tracking if enabled to adjust RCU state * 3) Tell lockdep that interrupts are enabled * * Invoked from architecture specific code before entering a guest. * Must be called with interrupts disabled and the caller must be * non-instrumentable. * The caller has to invoke guest_timing_enter_irqoff() before this. * * Note: this is analogous to exit_to_user_mode(). */static __always_inline void guest_state_enter_irqoff(void){ instrumentation_begin(); trace_hardirqs_on_prepare(); lockdep_hardirqs_on_prepare(); instrumentation_end();
guest_context_enter_irqoff(); lockdep_hardirqs_on(CALLER_ADDR0);}
/* * Exit guest context and exit an RCU extended quiescent state. * * Between guest_context_enter_irqoff() and guest_context_exit_irqoff() it is * unsafe to use any code which may directly or indirectly use RCU, tracing * (including IRQ flag tracing), or lockdep. All code in this period must be * non-instrumentable. */static __always_inline void guest_context_exit_irqoff(void){ /* * Guest mode is treated as a quiescent state, see * guest_context_enter_irqoff() for more details. */ if (!context_tracking_guest_exit()) { instrumentation_begin(); rcu_virt_note_context_switch(); instrumentation_end(); }}
/* * Stop accounting time towards a guest. * Must be called after exiting guest context. */static __always_inline void guest_timing_exit_irqoff(void){ instrumentation_begin(); /* Flush the guest cputime we spent on the guest */ vtime_account_guest_exit(); instrumentation_end();}
/* * Deprecated. Architectures should move to guest_state_exit_irqoff() and * guest_timing_exit_irqoff(). */static __always_inline void guest_exit_irqoff(void){ guest_context_exit_irqoff(); guest_timing_exit_irqoff();}
static inline void guest_exit(void){ unsigned long flags;
local_irq_save(flags); guest_exit_irqoff(); local_irq_restore(flags);}
/** * guest_state_exit_irqoff - Establish state when returning from guest mode * * Entry from a guest disables interrupts, but guest mode is traced as * interrupts enabled. Also with NO_HZ_FULL RCU might be idle. * * 1) Tell lockdep that interrupts are disabled * 2) Invoke context tracking if enabled to reactivate RCU * 3) Trace interrupts off state * * Invoked from architecture specific code after exiting a guest. * Must be invoked with interrupts disabled and the caller must be * non-instrumentable. * The caller has to invoke guest_timing_exit_irqoff() after this. * * Note: this is analogous to enter_from_user_mode(). */static __always_inline void guest_state_exit_irqoff(void){ lockdep_hardirqs_off(CALLER_ADDR0); guest_context_exit_irqoff();
instrumentation_begin(); trace_hardirqs_off_finish(); instrumentation_end();}
static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu){ /* * The memory barrier ensures a previous write to vcpu->requests cannot * be reordered with the read of vcpu->mode. It pairs with the general * memory barrier following the write of vcpu->mode in KVM_RUN. */ smp_mb__before_atomic(); return cmpxchg(&vcpu->mode, IN_GUEST_MODE, EXITING_GUEST_MODE);}
/* * Some of the bitops functions do not support too long bitmaps. * This number must be determined not to exceed such limits. */#define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1)
/* * Since at idle each memslot belongs to two memslot sets it has to contain * two embedded nodes for each data structure that it forms a part of. * * Two memslot sets (one active and one inactive) are necessary so the VM * continues to run on one memslot set while the other is being modified. * * These two memslot sets normally point to the same set of memslots. * They can, however, be desynchronized when performing a memslot management * operation by replacing the memslot to be modified by its copy. * After the operation is complete, both memslot sets once again point to * the same, common set of memslot data. * * The memslots themselves are independent of each other so they can be * individually added or deleted. */struct kvm_memory_slot { struct hlist_node id_node[2]; struct interval_tree_node hva_node[2]; struct rb_node gfn_node[2]; gfn_t base_gfn; unsigned long npages; unsigned long *dirty_bitmap; struct kvm_arch_memory_slot arch; unsigned long userspace_addr; u32 flags; short id; u16 as_id;
#ifdef CONFIG_KVM_GUEST_MEMFD struct { /* * Writes protected by kvm->slots_lock. Acquiring a * reference via kvm_gmem_get_file() is protected by * either kvm->slots_lock or kvm->srcu. */ struct file *file; pgoff_t pgoff; } gmem;#endif};
static inline bool kvm_slot_has_gmem(const struct kvm_memory_slot *slot){ return slot && (slot->flags & KVM_MEM_GUEST_MEMFD);}
static inline bool kvm_slot_dirty_track_enabled(const struct kvm_memory_slot *slot){ return slot->flags & KVM_MEM_LOG_DIRTY_PAGES;}
static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot){ return ALIGN(memslot->npages, BITS_PER_LONG) / 8;}
static inline unsigned long *kvm_second_dirty_bitmap(struct kvm_memory_slot *memslot){ unsigned long len = kvm_dirty_bitmap_bytes(memslot);
return memslot->dirty_bitmap + len / sizeof(*memslot->dirty_bitmap);}
#ifndef KVM_DIRTY_LOG_MANUAL_CAPS#define KVM_DIRTY_LOG_MANUAL_CAPS KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE#endif
struct kvm_s390_adapter_int { u64 ind_addr; u64 ind_gaddr; u64 summary_addr; u64 summary_gaddr; u64 ind_offset; u32 summary_offset; u32 adapter_id;};
struct kvm_hv_sint { u32 vcpu; u32 sint;};
struct kvm_xen_evtchn { u32 port; u32 vcpu_id; int vcpu_idx; u32 priority;};
struct kvm_kernel_irq_routing_entry { u32 gsi; u32 type; int (*set)(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, int irq_source_id, int level, bool line_status); union { struct { unsigned irqchip; unsigned pin; } irqchip; struct { u32 address_lo; u32 address_hi; u32 data; u32 flags; u32 devid; } msi; struct kvm_s390_adapter_int adapter; struct kvm_hv_sint hv_sint; struct kvm_xen_evtchn xen_evtchn; }; struct hlist_node link;};
#ifdef CONFIG_HAVE_KVM_IRQ_ROUTINGstruct kvm_irq_routing_table { int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS]; u32 nr_rt_entries; /* * Array indexed by gsi. Each entry contains list of irq chips * the gsi is connected to. */ struct hlist_head map[] __counted_by(nr_rt_entries);};#endif
bool kvm_arch_irqchip_in_kernel(struct kvm *kvm);
#ifndef KVM_INTERNAL_MEM_SLOTS#define KVM_INTERNAL_MEM_SLOTS 0#endif
#define KVM_MEM_SLOTS_NUM SHRT_MAX#define KVM_USER_MEM_SLOTS (KVM_MEM_SLOTS_NUM - KVM_INTERNAL_MEM_SLOTS)
#if KVM_MAX_NR_ADDRESS_SPACES == 1static inline int kvm_arch_nr_memslot_as_ids(struct kvm *kvm){ return KVM_MAX_NR_ADDRESS_SPACES;}
static inline int kvm_arch_vcpu_memslots_id(struct kvm_vcpu *vcpu){ return 0;}#endif
#ifndef kvm_arch_has_readonly_memstatic inline bool kvm_arch_has_readonly_mem(struct kvm *kvm){#ifdef __KVM_HAVE_READONLY_MEM return true;#else return false;#endif}#endif
struct kvm_memslots { u64 generation; atomic_long_t last_used_slot; struct rb_root_cached hva_tree; struct rb_root gfn_tree; /* * The mapping table from slot id to memslot. * * 7-bit bucket count matches the size of the old id to index array for * 512 slots, while giving good performance with this slot count. * Higher bucket counts bring only small performance improvements but * always result in higher memory usage (even for lower memslot counts). */ DECLARE_HASHTABLE(id_hash, 7); int node_idx;};
struct kvm {#ifdef KVM_HAVE_MMU_RWLOCK rwlock_t mmu_lock;#else spinlock_t mmu_lock;#endif /* KVM_HAVE_MMU_RWLOCK */
struct mutex slots_lock;
/* * Protects the arch-specific fields of struct kvm_memory_slots in * use by the VM. To be used under the slots_lock (above) or in a * kvm->srcu critical section where acquiring the slots_lock would * lead to deadlock with the synchronize_srcu in * kvm_swap_active_memslots(). */ struct mutex slots_arch_lock; /* * Back-reference to the VM file for subsystems (e.g., VFIO). Holds no * reference to avoid pinning the VM. Callers storing the file must * take their own reference. */ struct file *file; struct mm_struct *mm; /* userspace tied to this vm */ unsigned long nr_memslot_pages; /* The two memslot sets - active and inactive (per address space) */ struct kvm_memslots __memslots[KVM_MAX_NR_ADDRESS_SPACES][2]; /* The current active memslot set for each address space */ struct kvm_memslots __rcu *memslots[KVM_MAX_NR_ADDRESS_SPACES]; struct xarray vcpu_array; /* * Protected by slots_lock, but can be read outside if an * incorrect answer is acceptable. */ atomic_t nr_memslots_dirty_logging;
/* Used to wait for completion of MMU notifiers. */ spinlock_t mn_invalidate_lock; unsigned long mn_active_invalidate_count; struct rcuwait mn_memslots_update_rcuwait;
/* For management / invalidation of gfn_to_pfn_caches */ spinlock_t gpc_lock; struct list_head gpc_list;
/* * created_vcpus is protected by kvm->lock, and is incremented * at the beginning of KVM_CREATE_VCPU. online_vcpus is only * incremented after storing the kvm_vcpu pointer in vcpus, * and is accessed atomically. */ atomic_t online_vcpus; int max_vcpus; int created_vcpus; int last_boosted_vcpu; struct list_head vm_list; struct mutex lock; struct kvm_io_bus __rcu *buses[KVM_NR_BUSES];#ifdef CONFIG_HAVE_KVM_IRQCHIP struct { spinlock_t lock; struct list_head items; /* resampler_list update side is protected by resampler_lock. */ struct list_head resampler_list; struct mutex resampler_lock; } irqfds;#endif struct list_head ioeventfds; struct kvm_vm_stat stat; struct kvm_arch arch; refcount_t users_count;#ifndef __KVM_NO_MMIO struct kvm_coalesced_mmio_ring *coalesced_mmio_ring; spinlock_t ring_lock; struct list_head coalesced_zones;#endif
struct mutex irq_lock;#ifdef CONFIG_HAVE_KVM_IRQCHIP /* * Update side is protected by irq_lock. */ struct kvm_irq_routing_table __rcu *irq_routing;
struct hlist_head irq_ack_notifier_list;#endif
struct mmu_notifier mmu_notifier; unsigned long mmu_invalidate_seq; long mmu_invalidate_in_progress; gfn_t mmu_invalidate_range_start; gfn_t mmu_invalidate_range_end;
unsigned long gpc_invalidate_seq;
struct list_head devices; u64 manual_dirty_log_protect; struct dentry *debugfs_dentry; struct kvm_stat_data **debugfs_stat_data; struct srcu_struct srcu; struct srcu_struct irq_srcu; pid_t userspace_pid; bool override_halt_poll_ns; unsigned int max_halt_poll_ns; u32 dirty_ring_size; bool dirty_ring_with_bitmap; bool vm_bugged; bool vm_dead;
#ifdef CONFIG_HAVE_KVM_PM_NOTIFIER struct notifier_block pm_notifier;#endif#ifdef CONFIG_KVM_VM_MEMORY_ATTRIBUTES /* Protected by slots_lock (for writes) and RCU (for reads) */ struct xarray mem_attr_array;#endif char stats_id[KVM_STATS_NAME_SIZE];};
#define kvm_err(fmt, ...) \ pr_err("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)#define kvm_info(fmt, ...) \ pr_info("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)#define kvm_debug(fmt, ...) \ pr_debug("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)#define kvm_debug_ratelimited(fmt, ...) \ pr_debug_ratelimited("kvm [%i]: " fmt, task_pid_nr(current), \ ## __VA_ARGS__)#define kvm_pr_unimpl(fmt, ...) \ pr_err_ratelimited("kvm [%i]: " fmt, \ task_tgid_nr(current), ## __VA_ARGS__)
/* The guest did something we don't support. */#define vcpu_unimpl(vcpu, fmt, ...) \ kvm_pr_unimpl("vcpu%i, guest rIP: 0x%lx " fmt, \ (vcpu)->vcpu_id, kvm_rip_read(vcpu), ## __VA_ARGS__)
#define vcpu_debug(vcpu, fmt, ...) \ kvm_debug("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)#define vcpu_debug_ratelimited(vcpu, fmt, ...) \ kvm_debug_ratelimited("vcpu%i " fmt, (vcpu)->vcpu_id, \ ## __VA_ARGS__)#define vcpu_err(vcpu, fmt, ...) \ kvm_err("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
static inline void kvm_vm_dead(struct kvm *kvm){ kvm->vm_dead = true; kvm_make_all_cpus_request(kvm, KVM_REQ_VM_DEAD);}
static inline void kvm_vm_bugged(struct kvm *kvm){ kvm->vm_bugged = true; kvm_vm_dead(kvm);}
#define KVM_BUG(cond, kvm, fmt...) \({ \ bool __ret = !!(cond); \ \ if (WARN_ONCE(__ret && !(kvm)->vm_bugged, fmt)) \ kvm_vm_bugged(kvm); \ unlikely(__ret); \})
#define KVM_BUG_ON(cond, kvm) \({ \ bool __ret = !!(cond); \ \ if (WARN_ON_ONCE(__ret && !(kvm)->vm_bugged)) \ kvm_vm_bugged(kvm); \ unlikely(__ret); \})
/* * Note, "data corruption" refers to corruption of host kernel data structures, * not guest data. Guest data corruption, suspected or confirmed, that is tied * and contained to a single VM should *never* BUG() and potentially panic the * host, i.e. use this variant of KVM_BUG() if and only if a KVM data structure * is corrupted and that corruption can have a cascading effect to other parts * of the hosts and/or to other VMs. */#define KVM_BUG_ON_DATA_CORRUPTION(cond, kvm) \({ \ bool __ret = !!(cond); \ \ if (IS_ENABLED(CONFIG_BUG_ON_DATA_CORRUPTION)) \ BUG_ON(__ret); \ else if (WARN_ON_ONCE(__ret && !(kvm)->vm_bugged)) \ kvm_vm_bugged(kvm); \ unlikely(__ret); \})
static inline void kvm_vcpu_srcu_read_lock(struct kvm_vcpu *vcpu){#ifdef CONFIG_PROVE_RCU WARN_ONCE(vcpu->srcu_depth++, "KVM: Illegal vCPU srcu_idx LOCK, depth=%d", vcpu->srcu_depth - 1);#endif vcpu->____srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);}
static inline void kvm_vcpu_srcu_read_unlock(struct kvm_vcpu *vcpu){ srcu_read_unlock(&vcpu->kvm->srcu, vcpu->____srcu_idx);
#ifdef CONFIG_PROVE_RCU WARN_ONCE(--vcpu->srcu_depth, "KVM: Illegal vCPU srcu_idx UNLOCK, depth=%d", vcpu->srcu_depth);#endif}
static inline bool kvm_dirty_log_manual_protect_and_init_set(struct kvm *kvm){ return !!(kvm->manual_dirty_log_protect & KVM_DIRTY_LOG_INITIALLY_SET);}
/* * Get a bus reference under the update-side lock. No long-term SRCU reader * references are permitted, to avoid stale reads vs concurrent IO * registrations. */static inline struct kvm_io_bus *kvm_get_bus(struct kvm *kvm, enum kvm_bus idx){ return rcu_dereference_protected(kvm->buses[idx], lockdep_is_held(&kvm->slots_lock));}
static inline void kvm_lockdep_assert_vcpu_is_locked_or_unreachable(struct kvm_vcpu *vcpu){ lockdep_assert_once(lockdep_is_held(&vcpu->mutex) || vcpu->vcpu_idx < 0 || !refcount_read(&vcpu->kvm->users_count));}
static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i){ int num_vcpus = atomic_read(&kvm->online_vcpus);
/* * Explicitly verify the target vCPU is online, as the anti-speculation * logic only limits the CPU's ability to speculate, e.g. given a "bad" * index, clamping the index to 0 would return vCPU0, not NULL. */ if (i >= num_vcpus) return NULL;
i = array_index_nospec(i, num_vcpus);
/* Pairs with smp_wmb() in kvm_vm_ioctl_create_vcpu. */ smp_rmb(); return xa_load(&kvm->vcpu_array, i);}
#define kvm_for_each_vcpu(idx, vcpup, kvm) \ if (atomic_read(&kvm->online_vcpus)) \ xa_for_each_range(&kvm->vcpu_array, idx, vcpup, 0, \ (atomic_read(&kvm->online_vcpus) - 1))
static inline struct kvm_vcpu *kvm_get_vcpu_by_id(struct kvm *kvm, int id){ struct kvm_vcpu *vcpu = NULL; unsigned long i;
if (id < 0) return NULL; if (id < KVM_MAX_VCPUS) vcpu = kvm_get_vcpu(kvm, id); if (vcpu && vcpu->vcpu_id == id) return vcpu; kvm_for_each_vcpu(i, vcpu, kvm) if (vcpu->vcpu_id == id) return vcpu; return NULL;}
static inline bool kvm_is_vcpu_creation_in_progress(struct kvm *kvm){ lockdep_assert_held(&kvm->lock);
return kvm->created_vcpus != atomic_read(&kvm->online_vcpus);}
void kvm_destroy_vcpus(struct kvm *kvm);
int kvm_trylock_all_vcpus(struct kvm *kvm);int kvm_lock_all_vcpus(struct kvm *kvm);void kvm_unlock_all_vcpus(struct kvm *kvm);
void vcpu_load(struct kvm_vcpu *vcpu);void vcpu_put(struct kvm_vcpu *vcpu);
#ifdef CONFIG_KVM_IOAPICvoid kvm_arch_post_irq_ack_notifier_list_update(struct kvm *kvm);#elsestatic inline void kvm_arch_post_irq_ack_notifier_list_update(struct kvm *kvm){}#endif
#ifdef CONFIG_HAVE_KVM_IRQCHIPint kvm_irqfd_init(void);void kvm_irqfd_exit(void);#elsestatic inline int kvm_irqfd_init(void){ return 0;}
static inline void kvm_irqfd_exit(void){}#endifint kvm_init(unsigned vcpu_size, unsigned vcpu_align, struct module *module);void kvm_exit(void);
void kvm_get_kvm(struct kvm *kvm);bool kvm_get_kvm_safe(struct kvm *kvm);void kvm_put_kvm(struct kvm *kvm);
/* * Architectures define kvm_file_to_kvm_arch to <arch> * to get a typed, arch-namespaced helper: * * struct kvm *file_to_kvm_<arch>(struct file *file) */#ifdef kvm_file_to_kvm_arch#define kvm_file_to_kvm_fn CONCATENATE(file_to_kvm_, kvm_file_to_kvm_arch)struct kvm *kvm_file_to_kvm_fn(struct file *file);#endif /* kvm_file_to_kvm_arch */
void kvm_put_kvm_no_destroy(struct kvm *kvm);
static inline struct kvm_memslots *__kvm_memslots(struct kvm *kvm, int as_id){ as_id = array_index_nospec(as_id, KVM_MAX_NR_ADDRESS_SPACES); return srcu_dereference_check(kvm->memslots[as_id], &kvm->srcu, lockdep_is_held(&kvm->slots_lock) || !refcount_read(&kvm->users_count));}
static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm){ return __kvm_memslots(kvm, 0);}
static inline struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu){ int as_id = kvm_arch_vcpu_memslots_id(vcpu);
return __kvm_memslots(vcpu->kvm, as_id);}
static inline bool kvm_memslots_empty(struct kvm_memslots *slots){ return RB_EMPTY_ROOT(&slots->gfn_tree);}
bool kvm_are_all_memslots_empty(struct kvm *kvm);
#define kvm_for_each_memslot(memslot, bkt, slots) \ hash_for_each(slots->id_hash, bkt, memslot, id_node[slots->node_idx]) \ if (WARN_ON_ONCE(!memslot->npages)) { \ } else
static inlinestruct kvm_memory_slot *id_to_memslot(struct kvm_memslots *slots, int id){ struct kvm_memory_slot *slot; int idx = slots->node_idx;
hash_for_each_possible(slots->id_hash, slot, id_node[idx], id) { if (slot->id == id) return slot; }
return NULL;}
/* Iterator used for walking memslots that overlap a gfn range. */struct kvm_memslot_iter { struct kvm_memslots *slots; struct rb_node *node; struct kvm_memory_slot *slot;};
static inline void kvm_memslot_iter_next(struct kvm_memslot_iter *iter){ iter->node = rb_next(iter->node); if (!iter->node) return;
iter->slot = container_of(iter->node, struct kvm_memory_slot, gfn_node[iter->slots->node_idx]);}
static inline void kvm_memslot_iter_start(struct kvm_memslot_iter *iter, struct kvm_memslots *slots, gfn_t start){ int idx = slots->node_idx; struct rb_node *tmp; struct kvm_memory_slot *slot;
iter->slots = slots;
/* * Find the so called "upper bound" of a key - the first node that has * its key strictly greater than the searched one (the start gfn in our case). */ iter->node = NULL; for (tmp = slots->gfn_tree.rb_node; tmp; ) { slot = container_of(tmp, struct kvm_memory_slot, gfn_node[idx]); if (start < slot->base_gfn) { iter->node = tmp; tmp = tmp->rb_left; } else { tmp = tmp->rb_right; } }
/* * Find the slot with the lowest gfn that can possibly intersect with * the range, so we'll ideally have slot start <= range start */ if (iter->node) { /* * A NULL previous node means that the very first slot * already has a higher start gfn. * In this case slot start > range start. */ tmp = rb_prev(iter->node); if (tmp) iter->node = tmp; } else { /* a NULL node below means no slots */ iter->node = rb_last(&slots->gfn_tree); }
if (iter->node) { iter->slot = container_of(iter->node, struct kvm_memory_slot, gfn_node[idx]);
/* * It is possible in the slot start < range start case that the * found slot ends before or at range start (slot end <= range start) * and so it does not overlap the requested range. * * In such non-overlapping case the next slot (if it exists) will * already have slot start > range start, otherwise the logic above * would have found it instead of the current slot. */ if (iter->slot->base_gfn + iter->slot->npages <= start) kvm_memslot_iter_next(iter); }}
static inline bool kvm_memslot_iter_is_valid(struct kvm_memslot_iter *iter, gfn_t end){ if (!iter->node) return false;
/* * If this slot starts beyond or at the end of the range so does * every next one */ return iter->slot->base_gfn < end;}
/* Iterate over each memslot at least partially intersecting [start, end) range */#define kvm_for_each_memslot_in_gfn_range(iter, slots, start, end) \ for (kvm_memslot_iter_start(iter, slots, start); \ kvm_memslot_iter_is_valid(iter, end); \ kvm_memslot_iter_next(iter))
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu);struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn);
/* * KVM_SET_USER_MEMORY_REGION ioctl allows the following operations: * - create a new memory slot * - delete an existing memory slot * - modify an existing memory slot * -- move it in the guest physical memory space * -- just change its flags * * Since flags can be changed by some of these operations, the following * differentiation is the best we can do for kvm_set_memory_region(): */enum kvm_mr_change { KVM_MR_CREATE, KVM_MR_DELETE, KVM_MR_MOVE, KVM_MR_FLAGS_ONLY,};
int kvm_set_internal_memslot(struct kvm *kvm, const struct kvm_userspace_memory_region2 *mem);void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot);void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen);int kvm_arch_prepare_memory_region(struct kvm *kvm, const struct kvm_memory_slot *old, struct kvm_memory_slot *new, enum kvm_mr_change change);void kvm_arch_commit_memory_region(struct kvm *kvm, struct kvm_memory_slot *old, const struct kvm_memory_slot *new, enum kvm_mr_change change);/* flush all memory translations */void kvm_arch_flush_shadow_all(struct kvm *kvm);/* flush memory translations pointing to 'slot' */void kvm_arch_flush_shadow_memslot(struct kvm *kvm, struct kvm_memory_slot *slot);
int kvm_prefetch_pages(struct kvm_memory_slot *slot, gfn_t gfn, struct page **pages, int nr_pages);
struct page *__gfn_to_page(struct kvm *kvm, gfn_t gfn, bool write);static inline struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn){ return __gfn_to_page(kvm, gfn, true);}
unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable);unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn);unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, gfn_t gfn, bool *writable);
static inline void kvm_release_page_unused(struct page *page){ if (!page) return;
put_page(page);}
void kvm_release_page_clean(struct page *page);void kvm_release_page_dirty(struct page *page);
static inline void kvm_release_faultin_page(struct kvm *kvm, struct page *page, bool unused, bool dirty){ lockdep_assert_once(lockdep_is_held(&kvm->mmu_lock) || unused);
if (!page) return;
/* * If the page that KVM got from the *primary MMU* is writable, and KVM * installed or reused a SPTE, mark the page/folio dirty. Note, this * may mark a folio dirty even if KVM created a read-only SPTE, e.g. if * the GFN is write-protected. Folios can't be safely marked dirty * outside of mmu_lock as doing so could race with writeback on the * folio. As a result, KVM can't mark folios dirty in the fast page * fault handler, and so KVM must (somewhat) speculatively mark the * folio dirty if KVM could locklessly make the SPTE writable. */ if (unused) kvm_release_page_unused(page); else if (dirty) kvm_release_page_dirty(page); else kvm_release_page_clean(page);}
kvm_pfn_t __kvm_faultin_pfn(const struct kvm_memory_slot *slot, gfn_t gfn, unsigned int foll, bool *writable, struct page **refcounted_page);
static inline kvm_pfn_t kvm_faultin_pfn(struct kvm_vcpu *vcpu, gfn_t gfn, bool write, bool *writable, struct page **refcounted_page){ return __kvm_faultin_pfn(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, write ? FOLL_WRITE : 0, writable, refcounted_page);}
int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, int len);int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, void *data, unsigned long len);int kvm_read_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, void *data, unsigned int offset, unsigned long len);int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, int offset, int len);int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, unsigned long len);int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, void *data, unsigned long len);int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, void *data, unsigned int offset, unsigned long len);int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, gpa_t gpa, unsigned long len);
#define __kvm_get_guest(kvm, gfn, offset, v) \({ \ unsigned long __addr = gfn_to_hva(kvm, gfn); \ typeof(v) __user *__uaddr = (typeof(__uaddr))(__addr + offset); \ int __ret = -EFAULT; \ \ if (!kvm_is_error_hva(__addr)) \ __ret = get_user(v, __uaddr); \ __ret; \})
#define kvm_get_guest(kvm, gpa, v) \({ \ gpa_t __gpa = gpa; \ struct kvm *__kvm = kvm; \ \ __kvm_get_guest(__kvm, __gpa >> PAGE_SHIFT, \ offset_in_page(__gpa), v); \})
#define __kvm_put_guest(kvm, gfn, offset, v) \({ \ unsigned long __addr = gfn_to_hva(kvm, gfn); \ typeof(v) __user *__uaddr = (typeof(__uaddr))(__addr + offset); \ int __ret = -EFAULT; \ \ if (!kvm_is_error_hva(__addr)) \ __ret = put_user(v, __uaddr); \ if (!__ret) \ mark_page_dirty(kvm, gfn); \ __ret; \})
#define kvm_put_guest(kvm, gpa, v) \({ \ gpa_t __gpa = gpa; \ struct kvm *__kvm = kvm; \ \ __kvm_put_guest(__kvm, __gpa >> PAGE_SHIFT, \ offset_in_page(__gpa), v); \})
int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);bool kvm_vcpu_is_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn);unsigned long kvm_host_page_size(struct kvm_vcpu *vcpu, gfn_t gfn);void mark_page_dirty_in_slot(struct kvm *kvm, const struct kvm_memory_slot *memslot, gfn_t gfn);void mark_page_dirty(struct kvm *kvm, gfn_t gfn);void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn);
int __kvm_vcpu_map(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map, bool writable);void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map);
static inline int kvm_vcpu_map(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map){ return __kvm_vcpu_map(vcpu, gfn, map, true);}
static inline int kvm_vcpu_map_readonly(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map){ return __kvm_vcpu_map(vcpu, gfn, map, false);}
static inline void kvm_vcpu_map_mark_dirty(struct kvm_vcpu *vcpu, struct kvm_host_map *map){ if (kvm_vcpu_mapped(map)) kvm_vcpu_mark_page_dirty(vcpu, map->gfn);}
typedef struct { struct kvm_vcpu *vcpu; struct kvm_host_map map; int ret;} kvm_vcpu_local_map_t;
#define DEFINE_VCPU_MAP_CLASS(ro) \DEFINE_CLASS(kvm_vcpu_map_local##ro, kvm_vcpu_local_map_t, \ if (!_T.ret) kvm_vcpu_unmap(_T.vcpu, &_T.map), \ ({ \ kvm_vcpu_local_map_t m = { .vcpu = vcpu }; \ \ m.ret = kvm_vcpu_map##ro(vcpu, gfn, &m.map); \ \ m; \ }), struct kvm_vcpu *vcpu, gfn_t gfn);DEFINE_VCPU_MAP_CLASS();DEFINE_VCPU_MAP_CLASS(_readonly);
unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn);unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable);int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, int offset, int len);int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len);int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len);int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, const void *data, int offset, int len);int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data, unsigned long len);
/** * kvm_gpc_init - initialize gfn_to_pfn_cache. * * @gpc: struct gfn_to_pfn_cache object. * @kvm: pointer to kvm instance. * * This sets up a gfn_to_pfn_cache by initializing locks and assigning the * immutable attributes. Note, the cache must be zero-allocated (or zeroed by * the caller before init). */void kvm_gpc_init(struct gfn_to_pfn_cache *gpc, struct kvm *kvm);
/** * kvm_gpc_activate - prepare a cached kernel mapping and HPA for a given guest * physical address. * * @gpc: struct gfn_to_pfn_cache object. * @gpa: guest physical address to map. * @len: sanity check; the range being access must fit a single page. * * @return: 0 for success. * -EINVAL for a mapping which would cross a page boundary. * -EFAULT for an untranslatable guest physical address. * * This primes a gfn_to_pfn_cache and links it into the @gpc->kvm's list for * invalidations to be processed. Callers are required to use kvm_gpc_check() * to ensure that the cache is valid before accessing the target page. */int kvm_gpc_activate(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len);
/** * kvm_gpc_activate_hva - prepare a cached kernel mapping and HPA for a given HVA. * * @gpc: struct gfn_to_pfn_cache object. * @hva: userspace virtual address to map. * @len: sanity check; the range being access must fit a single page. * * @return: 0 for success. * -EINVAL for a mapping which would cross a page boundary. * -EFAULT for an untranslatable guest physical address. * * The semantics of this function are the same as those of kvm_gpc_activate(). It * merely bypasses a layer of address translation. */int kvm_gpc_activate_hva(struct gfn_to_pfn_cache *gpc, unsigned long hva, unsigned long len);
/** * kvm_gpc_check - check validity of a gfn_to_pfn_cache. * * @gpc: struct gfn_to_pfn_cache object. * @len: sanity check; the range being access must fit a single page. * * @return: %true if the cache is still valid and the address matches. * %false if the cache is not valid. * * Callers outside IN_GUEST_MODE context should hold a read lock on @gpc->lock * while calling this function, and then continue to hold the lock until the * access is complete. * * Callers in IN_GUEST_MODE may do so without locking, although they should * still hold a read lock on kvm->scru for the memslot checks. */bool kvm_gpc_check(struct gfn_to_pfn_cache *gpc, unsigned long len);
/** * kvm_gpc_refresh - update a previously initialized cache. * * @gpc: struct gfn_to_pfn_cache object. * @len: sanity check; the range being access must fit a single page. * * @return: 0 for success. * -EINVAL for a mapping which would cross a page boundary. * -EFAULT for an untranslatable guest physical address. * * This will attempt to refresh a gfn_to_pfn_cache. Note that a successful * return from this function does not mean the page can be immediately * accessed because it may have raced with an invalidation. Callers must * still lock and check the cache status, as this function does not return * with the lock still held to permit access. */int kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, unsigned long len);
/** * kvm_gpc_deactivate - deactivate and unlink a gfn_to_pfn_cache. * * @gpc: struct gfn_to_pfn_cache object. * * This removes a cache from the VM's list to be processed on MMU notifier * invocation. */void kvm_gpc_deactivate(struct gfn_to_pfn_cache *gpc);
static inline bool kvm_gpc_is_gpa_active(struct gfn_to_pfn_cache *gpc){ return gpc->active && !kvm_is_error_gpa(gpc->gpa);}
static inline bool kvm_gpc_is_hva_active(struct gfn_to_pfn_cache *gpc){ return gpc->active && kvm_is_error_gpa(gpc->gpa);}
void kvm_sigset_activate(struct kvm_vcpu *vcpu);void kvm_sigset_deactivate(struct kvm_vcpu *vcpu);
void kvm_vcpu_halt(struct kvm_vcpu *vcpu);bool kvm_vcpu_block(struct kvm_vcpu *vcpu);void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu);void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu);bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu);
#ifndef CONFIG_S390void __kvm_vcpu_kick(struct kvm_vcpu *vcpu, bool wait);
static inline void kvm_vcpu_kick(struct kvm_vcpu *vcpu){ __kvm_vcpu_kick(vcpu, false);}#endif
int kvm_vcpu_yield_to(struct kvm_vcpu *target);void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu, bool yield_to_kernel_mode);
void kvm_flush_remote_tlbs(struct kvm *kvm);void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 nr_pages);void kvm_flush_remote_tlbs_memslot(struct kvm *kvm, const struct kvm_memory_slot *memslot);
#ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHEint kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int min);int __kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int capacity, int min);int kvm_mmu_memory_cache_nr_free_objects(struct kvm_mmu_memory_cache *mc);void kvm_mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc);void *kvm_mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc);#endif
void kvm_mmu_invalidate_start(struct kvm *kvm);void kvm_mmu_invalidate_range_add(struct kvm *kvm, gfn_t start, gfn_t end);void kvm_mmu_invalidate_end(struct kvm *kvm);bool kvm_mmu_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range);
long kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg);long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg);long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg);vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf);
int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext);
void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm, struct kvm_memory_slot *slot, gfn_t gfn_offset, unsigned long mask);void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot);
#ifndef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECTint kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log);int kvm_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log, int *is_dirty, struct kvm_memory_slot **memslot);#endif
int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level, bool line_status);int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap);int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg);long kvm_arch_vm_compat_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg);
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, struct kvm_translation *tr);
int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, struct kvm_mp_state *mp_state);int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, struct kvm_mp_state *mp_state);int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg);int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id);int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu);void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu);void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
#ifdef CONFIG_HAVE_KVM_PM_NOTIFIERint kvm_arch_pm_notifier(struct kvm *kvm, unsigned long state);#endif
#ifdef __KVM_HAVE_ARCH_VCPU_DEBUGFSvoid kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry);#elsestatic inline void kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu) {}#endif
#ifdef CONFIG_KVM_GENERIC_HARDWARE_ENABLING/* * kvm_arch_shutdown() is invoked immediately prior to forcefully disabling * hardware virtualization on all CPUs via IPI function calls (in preparation * for shutdown or reboot), e.g. to allow arch code to prepare for disabling * virtualization while KVM may be actively running vCPUs. */void kvm_arch_shutdown(void);/* * kvm_arch_{enable,disable}_virtualization() are called on one CPU, under * kvm_usage_lock, immediately after/before 0=>1 and 1=>0 transitions of * kvm_usage_count, i.e. at the beginning of the generic hardware enabling * sequence, and at the end of the generic hardware disabling sequence. */void kvm_arch_enable_virtualization(void);void kvm_arch_disable_virtualization(void);/* * kvm_arch_{enable,disable}_virtualization_cpu() are called on "every" CPU to * do the actual twiddling of hardware bits. The hooks are called on all * online CPUs when KVM enables/disabled virtualization, and on a single CPU * when that CPU is onlined/offlined (including for Resume/Suspend). */int kvm_arch_enable_virtualization_cpu(void);void kvm_arch_disable_virtualization_cpu(void);#endifbool kvm_vcpu_has_events(struct kvm_vcpu *vcpu);int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu);int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);bool kvm_arch_dy_runnable(struct kvm_vcpu *vcpu);bool kvm_arch_dy_has_pending_interrupt(struct kvm_vcpu *vcpu);bool kvm_arch_vcpu_preempted_in_kernel(struct kvm_vcpu *vcpu);void kvm_arch_pre_destroy_vm(struct kvm *kvm);void kvm_arch_create_vm_debugfs(struct kvm *kvm);
#ifndef __KVM_HAVE_ARCH_VM_ALLOC/* * All architectures that want to use vzalloc currently also * need their own kvm_arch_alloc_vm implementation. */static inline struct kvm *kvm_arch_alloc_vm(void){ return kzalloc_obj(struct kvm, GFP_KERNEL_ACCOUNT);}#endif
static inline void __kvm_arch_free_vm(struct kvm *kvm){ kvfree(kvm);}
#ifndef __KVM_HAVE_ARCH_VM_FREEstatic inline void kvm_arch_free_vm(struct kvm *kvm){ __kvm_arch_free_vm(kvm);}#endif
#ifndef __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBSstatic inline int kvm_arch_flush_remote_tlbs(struct kvm *kvm){ return -ENOTSUPP;}#elseint kvm_arch_flush_remote_tlbs(struct kvm *kvm);#endif
#ifndef __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGEstatic inline int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 nr_pages){ return -EOPNOTSUPP;}#elseint kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 nr_pages);#endif
#ifdef __KVM_HAVE_ARCH_NONCOHERENT_DMAvoid kvm_arch_register_noncoherent_dma(struct kvm *kvm);void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm);bool kvm_arch_has_noncoherent_dma(struct kvm *kvm);#elsestatic inline void kvm_arch_register_noncoherent_dma(struct kvm *kvm){}
static inline void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm){}
static inline bool kvm_arch_has_noncoherent_dma(struct kvm *kvm){ return false;}#endif
static inline struct rcuwait *kvm_arch_vcpu_get_wait(struct kvm_vcpu *vcpu){#ifdef __KVM_HAVE_ARCH_WQP return vcpu->arch.waitp;#else return &vcpu->wait;#endif}
/* * Wake a vCPU if necessary, but don't do any stats/metadata updates. Returns * true if the vCPU was blocking and was awakened, false otherwise. */static inline bool __kvm_vcpu_wake_up(struct kvm_vcpu *vcpu){ return !!rcuwait_wake_up(kvm_arch_vcpu_get_wait(vcpu));}
static inline bool kvm_vcpu_is_blocking(struct kvm_vcpu *vcpu){ return rcuwait_active(kvm_arch_vcpu_get_wait(vcpu));}
#ifdef __KVM_HAVE_ARCH_INTC_INITIALIZED/* * returns true if the virtual interrupt controller is initialized and * ready to accept virtual IRQ. On some architectures the virtual interrupt * controller is dynamically instantiated and this is not always true. */bool kvm_arch_intc_initialized(struct kvm *kvm);#elsestatic inline bool kvm_arch_intc_initialized(struct kvm *kvm){ return true;}#endif
#ifdef CONFIG_GUEST_PERF_EVENTSunsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu);
void __kvm_register_perf_callbacks(unsigned int (*pt_intr_handler)(void), void (*mediated_pmi_handler)(void));
static inline void kvm_register_perf_callbacks(void){ __kvm_register_perf_callbacks(NULL, NULL);}
void kvm_unregister_perf_callbacks(void);#elsestatic inline void kvm_register_perf_callbacks(void) {}static inline void kvm_unregister_perf_callbacks(void) {}#endif /* CONFIG_GUEST_PERF_EVENTS */
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);void kvm_arch_destroy_vm(struct kvm *kvm);
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
struct kvm_irq_ack_notifier { struct hlist_node link; unsigned gsi; void (*irq_acked)(struct kvm_irq_ack_notifier *kian);};
int kvm_irq_map_gsi(struct kvm *kvm, struct kvm_kernel_irq_routing_entry *entries, int gsi);int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin);
int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level, bool line_status);int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm, int irq_source_id, int level, bool line_status);int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, int irq_source_id, int level, bool line_status);bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin);void kvm_notify_acked_gsi(struct kvm *kvm, int gsi);void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);void kvm_register_irq_ack_notifier(struct kvm *kvm, struct kvm_irq_ack_notifier *kian);void kvm_unregister_irq_ack_notifier(struct kvm *kvm, struct kvm_irq_ack_notifier *kian);bool kvm_arch_irqfd_allowed(struct kvm *kvm, struct kvm_irqfd *args);
static inline bool is_gfn_in_memslot(const struct kvm_memory_slot *slot, gfn_t gfn){ return gfn >= slot->base_gfn && gfn < slot->base_gfn + slot->npages;}
/* * Returns a pointer to the memslot if it contains gfn. * Otherwise returns NULL. */static inline struct kvm_memory_slot *try_get_memslot(struct kvm_memory_slot *slot, gfn_t gfn){ if (!slot) return NULL;
if (is_gfn_in_memslot(slot, gfn)) return slot; else return NULL;}
/* * Returns a pointer to the memslot that contains gfn. Otherwise returns NULL. * * With "approx" set returns the memslot also when the address falls * in a hole. In that case one of the memslots bordering the hole is * returned. */static inline struct kvm_memory_slot *search_memslots(struct kvm_memslots *slots, gfn_t gfn, bool approx){ struct kvm_memory_slot *slot; struct rb_node *node; int idx = slots->node_idx;
slot = NULL; for (node = slots->gfn_tree.rb_node; node; ) { slot = container_of(node, struct kvm_memory_slot, gfn_node[idx]); if (gfn >= slot->base_gfn) { if (gfn < slot->base_gfn + slot->npages) return slot; node = node->rb_right; } else node = node->rb_left; }
return approx ? slot : NULL;}
static inline struct kvm_memory_slot *____gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn, bool approx){ struct kvm_memory_slot *slot;
slot = (struct kvm_memory_slot *)atomic_long_read(&slots->last_used_slot); slot = try_get_memslot(slot, gfn); if (slot) return slot;
slot = search_memslots(slots, gfn, approx); if (slot) { atomic_long_set(&slots->last_used_slot, (unsigned long)slot); return slot; }
return NULL;}
/* * __gfn_to_memslot() and its descendants are here to allow arch code to inline * the lookups in hot paths. gfn_to_memslot() itself isn't here as an inline * because that would bloat other code too much. */static inline struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn){ return ____gfn_to_memslot(slots, gfn, false);}
static inline unsigned long__gfn_to_hva_memslot(const struct kvm_memory_slot *slot, gfn_t gfn){ /* * The index was checked originally in search_memslots. To avoid * that a malicious guest builds a Spectre gadget out of e.g. page * table walks, do not let the processor speculate loads outside * the guest's registered memslots. */ unsigned long offset = gfn - slot->base_gfn; offset = array_index_nospec(offset, slot->npages); return slot->userspace_addr + offset * PAGE_SIZE;}
static inline int memslot_id(struct kvm *kvm, gfn_t gfn){ return gfn_to_memslot(kvm, gfn)->id;}
static inline gfn_thva_to_gfn_memslot(unsigned long hva, struct kvm_memory_slot *slot){ gfn_t gfn_offset = (hva - slot->userspace_addr) >> PAGE_SHIFT;
return slot->base_gfn + gfn_offset;}
static inline gpa_t gfn_to_gpa(gfn_t gfn){ return (gpa_t)gfn << PAGE_SHIFT;}
static inline gfn_t gpa_to_gfn(gpa_t gpa){ return (gfn_t)(gpa >> PAGE_SHIFT);}
static inline hpa_t pfn_to_hpa(kvm_pfn_t pfn){ return (hpa_t)pfn << PAGE_SHIFT;}
static inline bool kvm_is_gpa_in_memslot(struct kvm *kvm, gpa_t gpa){ unsigned long hva = gfn_to_hva(kvm, gpa_to_gfn(gpa));
return !kvm_is_error_hva(hva);}
static inline void kvm_gpc_mark_dirty_in_slot(struct gfn_to_pfn_cache *gpc){ lockdep_assert_held(&gpc->lock);
if (!gpc->memslot) return;
mark_page_dirty_in_slot(gpc->kvm, gpc->memslot, gpa_to_gfn(gpc->gpa));}
enum kvm_stat_kind { KVM_STAT_VM, KVM_STAT_VCPU,};
struct kvm_stat_data { struct kvm *kvm; const struct kvm_stats_desc *desc; enum kvm_stat_kind kind;};
#define STATS_DESC_COMMON(type, unit, base, exp, sz, bsz) \ .flags = type | unit | base | \ BUILD_BUG_ON_ZERO(type & ~KVM_STATS_TYPE_MASK) | \ BUILD_BUG_ON_ZERO(unit & ~KVM_STATS_UNIT_MASK) | \ BUILD_BUG_ON_ZERO(base & ~KVM_STATS_BASE_MASK), \ .exponent = exp, \ .size = sz, \ .bucket_size = bsz
#define VM_GENERIC_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \{ \ STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \ .offset = offsetof(struct kvm_vm_stat, generic.stat), \ .name = #stat, \}#define VCPU_GENERIC_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \{ \ STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \ .offset = offsetof(struct kvm_vcpu_stat, generic.stat), \ .name = #stat, \}#define VM_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \{ \ STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \ .offset = offsetof(struct kvm_vm_stat, stat), \ .name = #stat, \}#define VCPU_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \{ \ STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \ .offset = offsetof(struct kvm_vcpu_stat, stat), \ .name = #stat, \}/* SCOPE: VM, VM_GENERIC, VCPU, VCPU_GENERIC */#define STATS_DESC(SCOPE, stat, type, unit, base, exp, sz, bsz) \ SCOPE##_STATS_DESC(stat, type, unit, base, exp, sz, bsz)
#define STATS_DESC_CUMULATIVE(SCOPE, name, unit, base, exponent) \ STATS_DESC(SCOPE, name, KVM_STATS_TYPE_CUMULATIVE, \ unit, base, exponent, 1, 0)#define STATS_DESC_INSTANT(SCOPE, name, unit, base, exponent) \ STATS_DESC(SCOPE, name, KVM_STATS_TYPE_INSTANT, \ unit, base, exponent, 1, 0)#define STATS_DESC_PEAK(SCOPE, name, unit, base, exponent) \ STATS_DESC(SCOPE, name, KVM_STATS_TYPE_PEAK, \ unit, base, exponent, 1, 0)#define STATS_DESC_LINEAR_HIST(SCOPE, name, unit, base, exponent, sz, bsz) \ STATS_DESC(SCOPE, name, KVM_STATS_TYPE_LINEAR_HIST, \ unit, base, exponent, sz, bsz)#define STATS_DESC_LOG_HIST(SCOPE, name, unit, base, exponent, sz) \ STATS_DESC(SCOPE, name, KVM_STATS_TYPE_LOG_HIST, \ unit, base, exponent, sz, 0)
/* Cumulative counter, read/write */#define STATS_DESC_COUNTER(SCOPE, name) \ STATS_DESC_CUMULATIVE(SCOPE, name, KVM_STATS_UNIT_NONE, \ KVM_STATS_BASE_POW10, 0)/* Instantaneous counter, read only */#define STATS_DESC_ICOUNTER(SCOPE, name) \ STATS_DESC_INSTANT(SCOPE, name, KVM_STATS_UNIT_NONE, \ KVM_STATS_BASE_POW10, 0)/* Peak counter, read/write */#define STATS_DESC_PCOUNTER(SCOPE, name) \ STATS_DESC_PEAK(SCOPE, name, KVM_STATS_UNIT_NONE, \ KVM_STATS_BASE_POW10, 0)
/* Instantaneous boolean value, read only */#define STATS_DESC_IBOOLEAN(SCOPE, name) \ STATS_DESC_INSTANT(SCOPE, name, KVM_STATS_UNIT_BOOLEAN, \ KVM_STATS_BASE_POW10, 0)/* Peak (sticky) boolean value, read/write */#define STATS_DESC_PBOOLEAN(SCOPE, name) \ STATS_DESC_PEAK(SCOPE, name, KVM_STATS_UNIT_BOOLEAN, \ KVM_STATS_BASE_POW10, 0)
/* Cumulative time in nanosecond */#define STATS_DESC_TIME_NSEC(SCOPE, name) \ STATS_DESC_CUMULATIVE(SCOPE, name, KVM_STATS_UNIT_SECONDS, \ KVM_STATS_BASE_POW10, -9)/* Linear histogram for time in nanosecond */#define STATS_DESC_LINHIST_TIME_NSEC(SCOPE, name, sz, bsz) \ STATS_DESC_LINEAR_HIST(SCOPE, name, KVM_STATS_UNIT_SECONDS, \ KVM_STATS_BASE_POW10, -9, sz, bsz)/* Logarithmic histogram for time in nanosecond */#define STATS_DESC_LOGHIST_TIME_NSEC(SCOPE, name, sz) \ STATS_DESC_LOG_HIST(SCOPE, name, KVM_STATS_UNIT_SECONDS, \ KVM_STATS_BASE_POW10, -9, sz)
#define KVM_GENERIC_VM_STATS() \ STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush), \ STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush_requests)
#define KVM_GENERIC_VCPU_STATS() \ STATS_DESC_COUNTER(VCPU_GENERIC, halt_successful_poll), \ STATS_DESC_COUNTER(VCPU_GENERIC, halt_attempted_poll), \ STATS_DESC_COUNTER(VCPU_GENERIC, halt_poll_invalid), \ STATS_DESC_COUNTER(VCPU_GENERIC, halt_wakeup), \ STATS_DESC_TIME_NSEC(VCPU_GENERIC, halt_poll_success_ns), \ STATS_DESC_TIME_NSEC(VCPU_GENERIC, halt_poll_fail_ns), \ STATS_DESC_TIME_NSEC(VCPU_GENERIC, halt_wait_ns), \ STATS_DESC_LOGHIST_TIME_NSEC(VCPU_GENERIC, halt_poll_success_hist, \ HALT_POLL_HIST_COUNT), \ STATS_DESC_LOGHIST_TIME_NSEC(VCPU_GENERIC, halt_poll_fail_hist, \ HALT_POLL_HIST_COUNT), \ STATS_DESC_LOGHIST_TIME_NSEC(VCPU_GENERIC, halt_wait_hist, \ HALT_POLL_HIST_COUNT), \ STATS_DESC_IBOOLEAN(VCPU_GENERIC, blocking)
ssize_t kvm_stats_read(char *id, const struct kvm_stats_header *header, const struct kvm_stats_desc *desc, void *stats, size_t size_stats, char __user *user_buffer, size_t size, loff_t *offset);
/** * kvm_stats_linear_hist_update() - Update bucket value for linear histogram * statistics data. * * @data: start address of the stats data * @size: the number of bucket of the stats data * @value: the new value used to update the linear histogram's bucket * @bucket_size: the size (width) of a bucket */static inline void kvm_stats_linear_hist_update(u64 *data, size_t size, u64 value, size_t bucket_size){ size_t index = div64_u64(value, bucket_size);
index = min(index, size - 1); ++data[index];}
/** * kvm_stats_log_hist_update() - Update bucket value for logarithmic histogram * statistics data. * * @data: start address of the stats data * @size: the number of bucket of the stats data * @value: the new value used to update the logarithmic histogram's bucket */static inline void kvm_stats_log_hist_update(u64 *data, size_t size, u64 value){ size_t index = fls64(value);
index = min(index, size - 1); ++data[index];}
#define KVM_STATS_LINEAR_HIST_UPDATE(array, value, bsize) \ kvm_stats_linear_hist_update(array, ARRAY_SIZE(array), value, bsize)#define KVM_STATS_LOG_HIST_UPDATE(array, value) \ kvm_stats_log_hist_update(array, ARRAY_SIZE(array), value)
extern const struct kvm_stats_header kvm_vm_stats_header;extern const struct kvm_stats_desc kvm_vm_stats_desc[];extern const struct kvm_stats_header kvm_vcpu_stats_header;extern const struct kvm_stats_desc kvm_vcpu_stats_desc[];
static inline int mmu_invalidate_retry(struct kvm *kvm, unsigned long mmu_seq){ if (unlikely(kvm->mmu_invalidate_in_progress)) return 1; /* * Ensure the read of mmu_invalidate_in_progress happens before * the read of mmu_invalidate_seq. This interacts with the * smp_wmb() in mmu_notifier_invalidate_range_end to make sure * that the caller either sees the old (non-zero) value of * mmu_invalidate_in_progress or the new (incremented) value of * mmu_invalidate_seq. * * PowerPC Book3s HV KVM calls this under a per-page lock rather * than under kvm->mmu_lock, for scalability, so can't rely on * kvm->mmu_lock to keep things ordered. */ smp_rmb(); if (kvm->mmu_invalidate_seq != mmu_seq) return 1; return 0;}
static inline int mmu_invalidate_retry_gfn(struct kvm *kvm, unsigned long mmu_seq, gfn_t gfn){ lockdep_assert_held(&kvm->mmu_lock); /* * If mmu_invalidate_in_progress is non-zero, then the range maintained * by kvm_mmu_notifier_invalidate_range_start contains all addresses * that might be being invalidated. Note that it may include some false * positives, due to shortcuts when handing concurrent invalidations. */ if (unlikely(kvm->mmu_invalidate_in_progress)) { /* * Dropping mmu_lock after bumping mmu_invalidate_in_progress * but before updating the range is a KVM bug. */ if (WARN_ON_ONCE(kvm->mmu_invalidate_range_start == INVALID_GPA || kvm->mmu_invalidate_range_end == INVALID_GPA)) return 1;
if (gfn >= kvm->mmu_invalidate_range_start && gfn < kvm->mmu_invalidate_range_end) return 1; }
if (kvm->mmu_invalidate_seq != mmu_seq) return 1; return 0;}
/* * This lockless version of the range-based retry check *must* be paired with a * call to the locked version after acquiring mmu_lock, i.e. this is safe to * use only as a pre-check to avoid contending mmu_lock. This version *will* * get false negatives and false positives. */static inline bool mmu_invalidate_retry_gfn_unsafe(struct kvm *kvm, unsigned long mmu_seq, gfn_t gfn){ /* * Use READ_ONCE() to ensure the in-progress flag and sequence counter * are always read from memory, e.g. so that checking for retry in a * loop won't result in an infinite retry loop. Don't force loads for * start+end, as the key to avoiding infinite retry loops is observing * the 1=>0 transition of in-progress, i.e. getting false negatives * due to stale start+end values is acceptable. */ if (unlikely(READ_ONCE(kvm->mmu_invalidate_in_progress)) && gfn >= kvm->mmu_invalidate_range_start && gfn < kvm->mmu_invalidate_range_end) return true;
return READ_ONCE(kvm->mmu_invalidate_seq) != mmu_seq;}
#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
#define KVM_MAX_IRQ_ROUTES 4096 /* might need extension/rework in the future */
bool kvm_arch_can_set_irq_routing(struct kvm *kvm);int kvm_set_irq_routing(struct kvm *kvm, const struct kvm_irq_routing_entry *entries, unsigned nr, unsigned flags);int kvm_init_irq_routing(struct kvm *kvm);int kvm_set_routing_entry(struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e, const struct kvm_irq_routing_entry *ue);void kvm_free_irq_routing(struct kvm *kvm);
#else
static inline void kvm_free_irq_routing(struct kvm *kvm) {}
static inline int kvm_init_irq_routing(struct kvm *kvm){ return 0;}
#endif
int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);
void kvm_eventfd_init(struct kvm *kvm);int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
#ifdef CONFIG_HAVE_KVM_IRQCHIPint kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args);void kvm_irqfd_release(struct kvm *kvm);bool kvm_notify_irqfd_resampler(struct kvm *kvm, unsigned int irqchip, unsigned int pin);void kvm_irq_routing_update(struct kvm *);#elsestatic inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args){ return -EINVAL;}
static inline void kvm_irqfd_release(struct kvm *kvm) {}
static inline bool kvm_notify_irqfd_resampler(struct kvm *kvm, unsigned int irqchip, unsigned int pin){ return false;}#endif /* CONFIG_HAVE_KVM_IRQCHIP */
void kvm_arch_irq_routing_update(struct kvm *kvm);
static inline void __kvm_make_request(int req, struct kvm_vcpu *vcpu){ /* * Ensure the rest of the request is published to kvm_check_request's * caller. Paired with the smp_mb__after_atomic in kvm_check_request. */ smp_wmb(); set_bit(req & KVM_REQUEST_MASK, (void *)&vcpu->requests);}
static __always_inline void kvm_make_request(int req, struct kvm_vcpu *vcpu){ /* * Request that don't require vCPU action should never be logged in * vcpu->requests. The vCPU won't clear the request, so it will stay * logged indefinitely and prevent the vCPU from entering the guest. */ BUILD_BUG_ON(!__builtin_constant_p(req) || (req & KVM_REQUEST_NO_ACTION));
__kvm_make_request(req, vcpu);}
#ifndef CONFIG_S390static inline void kvm_make_request_and_kick(int req, struct kvm_vcpu *vcpu){ kvm_make_request(req, vcpu); __kvm_vcpu_kick(vcpu, req & KVM_REQUEST_WAIT);}#endif
static inline bool kvm_request_pending(struct kvm_vcpu *vcpu){ return READ_ONCE(vcpu->requests);}
static inline bool kvm_test_request(int req, struct kvm_vcpu *vcpu){ return test_bit(req & KVM_REQUEST_MASK, (void *)&vcpu->requests);}
static __always_inline void kvm_clear_request(int req, struct kvm_vcpu *vcpu){ BUILD_BUG_ON(req == KVM_REQ_VM_DEAD);
clear_bit(req & KVM_REQUEST_MASK, (void *)&vcpu->requests);}
static __always_inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu){ /* Once a VM is dead, it needs to stay dead. */ BUILD_BUG_ON(req == KVM_REQ_VM_DEAD);
if (kvm_test_request(req, vcpu)) { kvm_clear_request(req, vcpu);
/* * Ensure the rest of the request is visible to kvm_check_request's * caller. Paired with the smp_wmb in kvm_make_request. */ smp_mb__after_atomic(); return true; } else { return false; }}
#ifdef CONFIG_KVM_GENERIC_HARDWARE_ENABLINGextern bool enable_virt_at_load;#endif
extern unsigned int halt_poll_ns;extern unsigned int halt_poll_ns_grow;extern unsigned int halt_poll_ns_grow_start;extern unsigned int halt_poll_ns_shrink;
struct kvm_device { const struct kvm_device_ops *ops; struct kvm *kvm; void *private; struct list_head vm_node;};
/* create, destroy, and name are mandatory */struct kvm_device_ops { const char *name;
/* * create is called holding kvm->lock and any operations not suitable * to do while holding the lock should be deferred to init (see * below). */ int (*create)(struct kvm_device *dev, u32 type);
/* * init is called after create if create is successful and is called * outside of holding kvm->lock. */ void (*init)(struct kvm_device *dev);
/* * Destroy is responsible for freeing dev. * * Destroy may be called before or after destructors are called * on emulated I/O regions, depending on whether a reference is * held by a vcpu or other kvm component that gets destroyed * after the emulated I/O. */ void (*destroy)(struct kvm_device *dev);
/* * Release is an alternative method to free the device. It is * called when the device file descriptor is closed. Once * release is called, the destroy method will not be called * anymore as the device is removed from the device list of * the VM. kvm->lock is held. */ void (*release)(struct kvm_device *dev);
int (*set_attr)(struct kvm_device *dev, struct kvm_device_attr *attr); int (*get_attr)(struct kvm_device *dev, struct kvm_device_attr *attr); int (*has_attr)(struct kvm_device *dev, struct kvm_device_attr *attr); long (*ioctl)(struct kvm_device *dev, unsigned int ioctl, unsigned long arg); int (*mmap)(struct kvm_device *dev, struct vm_area_struct *vma);};
struct kvm_device *kvm_device_from_filp(struct file *filp);int kvm_register_device_ops(const struct kvm_device_ops *ops, u32 type);void kvm_unregister_device_ops(u32 type);
extern struct kvm_device_ops kvm_mpic_ops;extern struct kvm_device_ops kvm_arm_vgic_v2_ops;extern struct kvm_device_ops kvm_arm_vgic_v3_ops;extern struct kvm_device_ops kvm_arm_vgic_v5_ops;
#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val){ vcpu->spin_loop.in_spin_loop = val;}static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val){ vcpu->spin_loop.dy_eligible = val;}
#else /* !CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val){}
static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val){}#endif /* CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
static inline bool kvm_is_visible_memslot(struct kvm_memory_slot *memslot){ return (memslot && memslot->id < KVM_USER_MEM_SLOTS && !(memslot->flags & KVM_MEMSLOT_INVALID));}
struct kvm_vcpu *kvm_get_running_vcpu(void);struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void);
#if IS_ENABLED(CONFIG_HAVE_KVM_IRQ_BYPASS)struct kvm_kernel_irqfd;
bool kvm_arch_has_irq_bypass(void);int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *, struct irq_bypass_producer *);void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *, struct irq_bypass_producer *);void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *);void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *);void kvm_arch_update_irqfd_routing(struct kvm_kernel_irqfd *irqfd, struct kvm_kernel_irq_routing_entry *old, struct kvm_kernel_irq_routing_entry *new);#endif /* CONFIG_HAVE_KVM_IRQ_BYPASS */
#ifdef __KVM_HAVE_INVALID_WAKEUPS/* If we wakeup during the poll time, was it a sucessful poll? */static inline bool vcpu_valid_wakeup(struct kvm_vcpu *vcpu){ return vcpu->valid_wakeup;}
#elsestatic inline bool vcpu_valid_wakeup(struct kvm_vcpu *vcpu){ return true;}#endif /* __KVM_HAVE_INVALID_WAKEUPS */
#ifdef __KVM_HAVE_NO_POLL/* Callback that tells if we must not poll */bool kvm_arch_no_poll(struct kvm_vcpu *vcpu);#elsestatic inline bool kvm_arch_no_poll(struct kvm_vcpu *vcpu){ return false;}#endif /* __KVM_HAVE_NO_POLL */
void kvm_arch_guest_memory_reclaimed(struct kvm *kvm);
#ifdef __KVM_HAVE_VCPU_RUN_PID_CHANGEint kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu);#elsestatic inline int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu){ return 0;}#endif /* __KVM_HAVE_VCPU_RUN_PID_CHANGE */
#ifdef CONFIG_VIRT_XFER_TO_GUEST_WORKstatic inline void kvm_handle_signal_exit(struct kvm_vcpu *vcpu){ vcpu->run->exit_reason = KVM_EXIT_INTR; vcpu->stat.signal_exits++;}
static inline int kvm_xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu){ int r = xfer_to_guest_mode_handle_work();
if (r) { WARN_ON_ONCE(r != -EINTR); kvm_handle_signal_exit(vcpu); } return r;}#endif /* CONFIG_VIRT_XFER_TO_GUEST_WORK */
/* * If more than one page is being (un)accounted, @virt must be the address of * the first page of a block of pages what were allocated together (i.e * accounted together). * * kvm_account_pgtable_pages() is thread-safe because mod_lruvec_page_state() * is thread-safe. */static inline void kvm_account_pgtable_pages(void *virt, int nr){ mod_lruvec_page_state(virt_to_page(virt), NR_SECONDARY_PAGETABLE, nr);}
/* * This defines how many reserved entries we want to keep before we * kick the vcpu to the userspace to avoid dirty ring full. This * value can be tuned to higher if e.g. PML is enabled on the host. */#define KVM_DIRTY_RING_RSVD_ENTRIES 64
/* Max number of entries allowed for each kvm dirty ring */#define KVM_DIRTY_RING_MAX_ENTRIES 65536
static inline void kvm_prepare_memory_fault_exit(struct kvm_vcpu *vcpu, gpa_t gpa, gpa_t size, bool is_write, bool is_exec, bool is_private){ vcpu->run->exit_reason = KVM_EXIT_MEMORY_FAULT; vcpu->run->memory_fault.gpa = gpa; vcpu->run->memory_fault.size = size;
/* RWX flags are not (yet) defined or communicated to userspace. */ vcpu->run->memory_fault.flags = 0; if (is_private) vcpu->run->memory_fault.flags |= KVM_MEMORY_EXIT_FLAG_PRIVATE;}
static inline bool kvm_memslot_is_gmem_only(const struct kvm_memory_slot *slot){ if (!IS_ENABLED(CONFIG_KVM_GUEST_MEMFD)) return false;
return slot->flags & KVM_MEMSLOT_GMEM_ONLY;}
#ifdef CONFIG_KVM_VM_MEMORY_ATTRIBUTESstatic inline unsigned long kvm_get_vm_memory_attributes(struct kvm *kvm, gfn_t gfn){ return xa_to_value(xa_load(&kvm->mem_attr_array, gfn));}
bool kvm_range_has_vm_memory_attributes(struct kvm *kvm, gfn_t start, gfn_t end, unsigned long mask, unsigned long attrs);bool kvm_arch_pre_set_vm_memory_attributes(struct kvm *kvm, struct kvm_gfn_range *range);bool kvm_arch_post_set_vm_memory_attributes(struct kvm *kvm, struct kvm_gfn_range *range);#endif /* CONFIG_KVM_VM_MEMORY_ATTRIBUTES */
#ifdef CONFIG_KVM_PRIVATE_MEMATTR_VMextern bool gmem_in_place_conversion;typedef bool (kvm_is_private_gfn_t)(struct kvm *kvm, gfn_t gfn);DECLARE_STATIC_CALL(__kvm_is_private_gfn, kvm_is_private_gfn_t);
static inline bool kvm_is_private_gfn(struct kvm *kvm, gfn_t gfn){ return static_call(__kvm_is_private_gfn)(kvm, gfn);}
#elif defined kvm_arch_has_private_mem#define gmem_in_place_conversion true#define kvm_is_private_gfn kvm_gmem_is_private_gfn
#else#define gmem_in_place_conversion false
static inline bool kvm_arch_has_private_mem(struct kvm *kvm){ return false;}
static inline bool kvm_is_private_gfn(struct kvm *kvm, gfn_t gfn){ return false;}#endif /* kvm_arch_has_private_mem */
#ifdef CONFIG_KVM_GUEST_MEMFDbool kvm_gmem_is_private_gfn(struct kvm *kvm, gfn_t gfn);bool kvm_arch_supports_gmem_init_shared(struct kvm *kvm);
static inline u64 kvm_gmem_get_supported_flags(struct kvm *kvm){ u64 flags = GUEST_MEMFD_FLAG_MMAP;
if (!kvm || kvm_arch_supports_gmem_init_shared(kvm)) flags |= GUEST_MEMFD_FLAG_INIT_SHARED;
return flags;}
int kvm_gmem_get_pfn(struct kvm *kvm, struct kvm_memory_slot *slot, gfn_t gfn, kvm_pfn_t *pfn, int *max_order);#elsestatic inline int kvm_gmem_get_pfn(struct kvm *kvm, struct kvm_memory_slot *slot, gfn_t gfn, kvm_pfn_t *pfn, int *max_order){ KVM_BUG_ON(1, kvm); return -EIO;}#endif /* CONFIG_KVM_GUEST_MEMFD */
int kvm_arch_gmem_make_private(struct kvm *kvm, gfn_t gfn, kvm_pfn_t pfn, kvm_pfn_t nr_pages);void kvm_arch_gmem_make_shared(kvm_pfn_t pfn, kvm_pfn_t nr_pages);#ifndef CONFIG_HAVE_KVM_ARCH_GMEM_CONVERT#define kvm_arch_has_gmem_convert() false#endif
#ifdef CONFIG_HAVE_KVM_ARCH_GMEM_POPULATE/** * kvm_gmem_populate() - Populate/prepare a GPA range with guest data * * @kvm: KVM instance * @gfn: starting GFN to be populated * @src: userspace-provided buffer containing data to copy into GFN range * (passed to @post_populate, and incremented on each iteration * if not NULL). Must be page-aligned. * @npages: number of pages to copy from userspace-buffer * @post_populate: callback to issue for each gmem page that backs the GPA * range * @opaque: opaque data to pass to @post_populate callback * * This is primarily intended for cases where a gmem-backed GPA range needs * to be initialized with userspace-provided data prior to being mapped into * the guest as a private page. This should be called with the slots->lock * held so that caller-enforced invariants regarding the expected memory * attributes of the GPA range do not race with KVM_SET_MEMORY_ATTRIBUTES. * * Returns the number of pages that were populated. */typedef int (*kvm_gmem_populate_cb)(struct kvm *kvm, gfn_t gfn, kvm_pfn_t pfn, struct page *page, void *opaque);
long kvm_gmem_populate(struct kvm *kvm, gfn_t start_gfn, void __user *src, long npages, bool may_writeback_src, kvm_gmem_populate_cb post_populate, void *opaque);#endif
#ifdef CONFIG_HAVE_KVM_ARCH_GMEM_RECLAIMvoid kvm_arch_gmem_reclaim(kvm_pfn_t pfn, kvm_pfn_t nr_pages);#endif
#ifdef CONFIG_HAVE_KVM_ARCH_GMEM_INVALIDATEvoid kvm_arch_gmem_invalidate_range(struct kvm *kvm, struct kvm_gfn_range *range);#endif
#ifdef CONFIG_KVM_GENERIC_PRE_FAULT_MEMORYint kvm_arch_pre_fault_allowed(struct kvm_vcpu *vcpu);long kvm_arch_vcpu_pre_fault_memory(struct kvm_vcpu *vcpu, struct kvm_pre_fault_memory *range);#endif
#endif