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authorMarcelo Tosatti <marcelo@kvack.org>2008-02-23 11:44:30 -0300
committerAvi Kivity <avi@qumranet.com>2008-04-27 11:53:25 +0300
commit05da45583de9b383dc81dd695fe248431d6c9f2b (patch)
treea76d699e60aca4f775d5f67254214654235e2e17 /include/asm-x86
parent2e53d63acba75795aa226febd140f67c58c6a353 (diff)
KVM: MMU: large page support
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 <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'include/asm-x86')
-rw-r--r--include/asm-x86/kvm_host.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index 8c3f74b7352..95473ef5a90 100644
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -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 {