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KVM: MMU: skip global pgtables on sync due to cr3 switch

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Skip syncing global pages on cr3 switch (but not on cr4/cr0). This is
important for Linux 32-bit guests with PAE, where the kmap page is
marked as global.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Marcelo Tosatti
2008-12-01 22:32:04 -02:00
committed by Avi Kivity
parent b1a368218a
commit 6cffe8ca4a
4 changed files with 63 additions and 10 deletions
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6
arch/x86/include/asm/kvm_host.h
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@@ -182,6 +182,8 @@ struct kvm_mmu_page {
struct list_head link;
struct hlist_node hash_link;
struct list_head oos_link;
/*
* The following two entries are used to key the shadow page in the
* hash table.
@@ -200,6 +202,7 @@ struct kvm_mmu_page {
int multimapped; /* More than one parent_pte? */
int root_count; /* Currently serving as active root */
bool unsync;
bool global;
unsigned int unsync_children;
union {
u64 *parent_pte; /* !multimapped */
@@ -356,6 +359,7 @@ struct kvm_arch{
*/
struct list_head active_mmu_pages;
struct list_head assigned_dev_head;
struct list_head oos_global_pages;
struct dmar_domain *intel_iommu_domain;
struct kvm_pic *vpic;
struct kvm_ioapic *vioapic;
@@ -385,6 +389,7 @@ struct kvm_vm_stat {
u32 mmu_recycled;
u32 mmu_cache_miss;
u32 mmu_unsync;
u32 mmu_unsync_global;
u32 remote_tlb_flush;
u32 lpages;
};
@@ -603,6 +608,7 @@ void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
int kvm_mmu_load(struct kvm_vcpu *vcpu);
void kvm_mmu_unload(struct kvm_vcpu *vcpu);
void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu);
void kvm_mmu_sync_global(struct kvm_vcpu *vcpu);
int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);