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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 <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Marcelo Tosatti
2008-02-23 11:44:30 -03:00
committed by Avi Kivity
parent 2e53d63acb
commit 05da45583d
6 changed files with 262 additions and 32 deletions
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5
include/linux/kvm_host.h
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@@ -103,6 +103,10 @@ struct kvm_memory_slot {
unsigned long flags;
unsigned long *rmap;
unsigned long *dirty_bitmap;
struct {
unsigned long rmap_pde;
int write_count;
} *lpage_info;
unsigned long userspace_addr;
int user_alloc;
};
@@ -169,6 +173,7 @@ int kvm_arch_set_memory_region(struct kvm *kvm,
int user_alloc);
gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn);
struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
void kvm_release_page_clean(struct page *page);
void kvm_release_page_dirty(struct page *page);
int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,