Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e925c5ba9380dad5fdf1d0a9d9199ac43be74c6a
Commit:     e925c5ba9380dad5fdf1d0a9d9199ac43be74c6a
Parent:     c86813393f8b8f9f738ab57d9837858ed850df4b
Author:     Avi Kivity <[EMAIL PROTECTED]>
AuthorDate: Mon Apr 30 14:47:02 2007 +0300
Committer:  Avi Kivity <[EMAIL PROTECTED]>
CommitDate: Mon Jul 16 12:05:38 2007 +0300

    KVM: Assume that writes smaller than 4 bytes are to non-pagetable pages
    
    This allows us to remove write protection earlier than otherwise.  Should
    some mad OS choose to use byte writes to update pagetables, it will suffer
    a performance hit, but still work correctly.
    
    Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
---
 drivers/kvm/mmu.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index e8e2281..2277b7c 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -1169,6 +1169,7 @@ void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, 
int bytes)
                        continue;
                pte_size = page->role.glevels == PT32_ROOT_LEVEL ? 4 : 8;
                misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1);
+               misaligned |= bytes < 4;
                if (misaligned || flooded) {
                        /*
                         * Misaligned accesses are too much trouble to fix
-
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