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KVM: MMU: large page support

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Create large pages mappings if the guest PTE's are marked as such and
the underlying memory is hugetlbfs backed.  If the largepage contains
write-protected pages, a large pte is not used.

Gives a consistent 2% improvement for data copies on ram mounted
filesystem, without NPT/EPT.

Anthony measures a 4% improvement on 4-way kernbench, with NPT.

Signed-off-by: Marcelo Tosatti <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
This commit is contained in:
Marcelo Tosatti 2008-02-23 11:44:30 -03:00 • committed by Avi Kivity
commit 05da45583d
6 changed files with 262 additions and 32 deletions
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9
include/asm-x86/kvm_host.h
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@ -39,6 +39,13 @@
#define INVALID_PAGE (~(hpa_t)0)
#define UNMAPPED_GVA (~(gpa_t)0)
/* shadow tables are PAE even on non-PAE hosts */
#define KVM_HPAGE_SHIFT 21
#define KVM_HPAGE_SIZE (1UL << KVM_HPAGE_SHIFT)
#define KVM_HPAGE_MASK (~(KVM_HPAGE_SIZE - 1))
#define KVM_PAGES_PER_HPAGE (KVM_HPAGE_SIZE / PAGE_SIZE)
#define DE_VECTOR 0
#define UD_VECTOR 6
#define NM_VECTOR 7
@ -230,6 +237,7 @@ struct kvm_vcpu_arch {
struct {
gfn_t gfn; /* presumed gfn during guest pte update */
struct page *page; /* page corresponding to that gfn */
int largepage;
} update_pte;
struct i387_fxsave_struct host_fx_image;
@ -307,6 +315,7 @@ struct kvm_vm_stat {
u32 mmu_recycled;
u32 mmu_cache_miss;
u32 remote_tlb_flush;
u32 lpages;
};
struct kvm_vcpu_stat {