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[PATCH] KVM: MMU: Add missing dirty bit 

If we emulate a write, we fail to set the dirty bit on the guest pte, leading
the guest to believe the page is clean, and thus lose data.  Bad.

Fix by setting the guest pte dirty bit under such conditions.

Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
hifive-unleashed-5.1
Avi Kivity 2007-01-05 16:36:59 -08:00 committed by Linus Torvalds
parent 4db9c47c05
commit 760db773fb
1 changed files with 1 additions and 0 deletions
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drivers/kvm/paging_tmpl.h
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@ -317,6 +317,7 @@ static int FNAME(fix_write_pf)(struct kvm_vcpu *vcpu,
} else if (kvm_mmu_lookup_page(vcpu, gfn)) {
pgprintk("%s: found shadow page for %lx, marking ro\n",
__FUNCTION__, gfn);
*guest_ent |= PT_DIRTY_MASK;
*write_pt = 1;
return 0;
}