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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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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253// SPDX-License-Identifier: GPL-2.0-only/****************************************************************************** * features.c * * Xen feature flags. * * Copyright (c) 2006, Ian Campbell, XenSource Inc. */#include <linux/types.h>#include <linux/cache.h>#include <linux/export.h>#include <linux/printk.h>
#include <asm/xen/hypercall.h>
#include <xen/xen.h>#include <xen/interface/xen.h>#include <xen/interface/version.h>#include <xen/features.h>
/* * Linux kernel expects at least Xen 4.0. * * Assume some features to be available for that reason (depending on guest * mode, of course). */#define chk_required_feature(f) { \ if (!xen_feature(f)) \ panic("Xen: feature %s not available!\n", #f); \ }
u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly;EXPORT_SYMBOL_GPL(xen_features);
void xen_setup_features(void){ struct xen_feature_info fi; int i, j;
for (i = 0; i < XENFEAT_NR_SUBMAPS; i++) { fi.submap_idx = i; if (HYPERVISOR_xen_version(XENVER_get_features, &fi) < 0) break; for (j = 0; j < 32; j++) xen_features[i * 32 + j] = !!(fi.submap & 1U << j); }
if (xen_pv_domain()) { chk_required_feature(XENFEAT_mmu_pt_update_preserve_ad); chk_required_feature(XENFEAT_gnttab_map_avail_bits); }}