If the destination is a memory operand and the memory
cannot map to a valid page, the xchg instruction emulation
will fail. If so, we should emulate exchange as write
to fix it.
Signed-off-by: Wei Yongjun <yj...@cn.fujitsu.com>
---
arch/x86/kvm/x86.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d94811e..ac63f6f 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3560,6 +3560,8 @@ static int emulator_cmpxchg_emulated(unsigned long addr,
goto emul_write;
page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
+ if (is_error_page(page))
+ goto emul_write;
kaddr = kmap_atomic(page, KM_USER0);
kaddr += offset_in_page(gpa);
--
1.7.0.4
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