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authorAvi Kivity <avi@qumranet.com>2007-01-05 16:36:45 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2007-01-05 23:55:25 -0800
commita436036baf331703b4d2c8e8a45f02c597bf6913 (patch)
treeba134b0b42ca42c53e818073af8d51d73771c56b /drivers/kvm/kvm_main.c
parent9b7a032567ee1128daeebebfc14d3acedfe28c8c (diff)
[PATCH] KVM: MMU: If emulating an instruction fails, try unprotecting the page
A page table may have been recycled into a regular page, and so any instruction can be executed on it. Unprotect the page and let the cpu do its thing. Signed-off-by: Avi Kivity <avi@qumranet.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/kvm/kvm_main.c')
-rw-r--r--drivers/kvm/kvm_main.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 047f6f6ed3f6..79032438dd16 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -1063,6 +1063,8 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
}
if (r) {
+ if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
+ return EMULATE_DONE;
if (!vcpu->mmio_needed) {
report_emulation_failure(&emulate_ctxt);
return EMULATE_FAIL;