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Commit 251eb841 authored by Radim Krčmář's avatar Radim Krčmář Committed by Paolo Bonzini
Browse files

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: default avatarRadim Krčmář <rkrcmar@redhat.com>
Message-Id: <1428695247-27603-1-git-send-email-rkrcmar@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 4eb64dce

virt/kvm/kvm_main.c

+4 −2
Original line number Diff line number Diff line
@@ -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);