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kvm: x86: Add multi-entry LRU cache for previous CR3s

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Adds support for storing multiple previous CR3/root_hpa pairs maintained
as an LRU cache, so that the lockless CR3 switch path can be used when
switching back to any of them.

Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Junaid Shahid
2018-06-27 14:59:20 -07:00
committed by Paolo Bonzini
parent faff87588d
commit b94742c958
3 changed files with 92 additions and 41 deletions
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10
arch/x86/include/asm/kvm_host.h
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@@ -335,6 +335,8 @@ struct kvm_mmu_root_info {
#define KVM_MMU_ROOT_INFO_INVALID \
((struct kvm_mmu_root_info) { .cr3 = INVALID_PAGE, .hpa = INVALID_PAGE })
#define KVM_MMU_NUM_PREV_ROOTS 3
/*
* x86 supports 4 paging modes (5-level 64-bit, 4-level 64-bit, 3-level 32-bit,
* and 2-level 32-bit). The kvm_mmu structure abstracts the details of the
@@ -363,7 +365,7 @@ struct kvm_mmu {
u8 shadow_root_level;
u8 ept_ad;
bool direct_map;
struct kvm_mmu_root_info prev_root;
struct kvm_mmu_root_info prev_roots[KVM_MMU_NUM_PREV_ROOTS];
/*
* Bitmap; bit set = permission fault
@@ -1295,9 +1297,9 @@ static inline int __kvm_irq_line_state(unsigned long *irq_state,
return !!(*irq_state);
}
#define KVM_MMU_ROOT_CURRENT BIT(0)
#define KVM_MMU_ROOT_PREVIOUS BIT(1)
#define KVM_MMU_ROOTS_ALL (~0UL)
#define KVM_MMU_ROOT_CURRENT BIT(0)
#define KVM_MMU_ROOT_PREVIOUS(i) BIT(1+i)
#define KVM_MMU_ROOTS_ALL (~0UL)
int kvm_pic_set_irq(struct kvm_pic *pic, int irq, int irq_source_id, int level);
void kvm_pic_clear_all(struct kvm_pic *pic, int irq_source_id);