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authorRadim Krčmář <rkrcmar@redhat.com>2015-04-10 22:47:27 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2015-05-08 11:51:38 +0300
commit251eb84144ec7aba5e344fb8553c67e749655aef (patch)
tree7bdf7614318665a65267d274cae7fbf3205b5263 /virt
parent4eb64dce8d0a3ceccc0036383e4683b7c3ea7a50 (diff)
downloadlinux-251eb84144ec7aba5e344fb8553c67e749655aef.tar.xz
KVM: reuse memslot in kvm_write_guest_page
Caching memslot value and using mark_page_dirty_in_slot() avoids another O(log N) search when dirtying the page. Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> Message-Id: <1428695247-27603-1-git-send-email-rkrcmar@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 90977418aeb6..b6d415156283 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1590,15 +1590,17 @@ int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
int offset, int len)
{
int r;
+ struct kvm_memory_slot *memslot;
unsigned long addr;
- addr = gfn_to_hva(kvm, gfn);
+ memslot = gfn_to_memslot(kvm, gfn);
+ addr = gfn_to_hva_memslot(memslot, gfn);
if (kvm_is_error_hva(addr))
return -EFAULT;
r = __copy_to_user((void __user *)addr + offset, data, len);
if (r)
return -EFAULT;
- mark_page_dirty(kvm, gfn);
+ mark_page_dirty_in_slot(kvm, memslot, gfn);
return 0;
}
EXPORT_SYMBOL_GPL(kvm_write_guest_page);