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>
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 9097741..b6d4151 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1590,15 +1590,17 @@
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);