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 <yjwei@xxxxxxxxxxxxxx> --- 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 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
