KVM: Assume that writes smaller than 4 bytes are to non-pagetable pages
Avi Kivity [Mon, 30 Apr 2007 11:47:02 +0000 (14:47 +0300)]
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 <avi@qumranet.com>

drivers/kvm/mmu.c

index e8e2281..2277b7c 100644 (file)
@@ -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