KVM: x86: fix possible infinite loop caused by reexecute_instruction

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Currently, we reexecute all unhandleable instructions if they do not
access on the mmio, however, it can not work if host map the readonly
memory to guest. If the instruction try to write this kind of memory,
it will fault again when guest retry it, then we will goto a infinite
loop: retry instruction -> write #PF -> emulation fail ->
retry instruction -> ...

Fix it by retrying the instruction only when it faults on the writable
memory

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

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Xiao Guangrong 2012-08-21 10:57:42 +08:00 • committed by Avi Kivity

parent 8fbe6a541f

commit 8e3d9d061b

1 changed files with 11 additions and 1 deletions

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arch/x86/kvm/x86.c

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