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| author | Marcelo Tosatti <marcelo@kvack.org> | 2008-02-23 17:44:30 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-04-27 12:53:25 +0400 |
| commit | 05da45583de9b383dc81dd695fe248431d6c9f2b (patch) | |
| tree | a76d699e60aca4f775d5f67254214654235e2e17 /include/linux/kvm_host.h | |
| parent | 2e53d63acba75795aa226febd140f67c58c6a353 (diff) | |
| download | linux-05da45583de9b383dc81dd695fe248431d6c9f2b.tar.xz | |
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/linux/kvm_host.h')
| -rw-r--r-- | include/linux/kvm_host.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 994278fb5883..9750bb3c5a75 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -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, |