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: NRadim Krčmář <rkrcmar@redhat.com> Message-Id: <1428695247-27603-1-git-send-email-rkrcmar@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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