KVM: x86: improve reexecute_instruction

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The current reexecute_instruction can not well detect the failed instruction
emulation. It allows guest to retry all the instructions except it accesses
on error pfn

For example, some cases are nested-write-protect - if the page we want to
write is used as PDE but it chains to itself. Under this case, we should
stop the emulation and report the case to userspace

Reviewed-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

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This commit is contained in:

Xiao Guangrong 2013-01-13 23:49:07 +08:00 • committed by Marcelo Tosatti

parent 95b3cf69bd

commit 93c05d3ef2

3 changed files with 45 additions and 11 deletions

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7

arch/x86/include/asm/kvm_host.h

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27

arch/x86/kvm/paging_tmpl.h

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22

arch/x86/kvm/x86.c

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