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SubjectRe: [PATCH v2 0/5] KVM: x86: improve reexecute_instruction
On Mon, Dec 10, 2012 at 05:11:35PM +0800, Xiao Guangrong wrote:
> Changelog:
> There are some changes from Marcelo and Gleb's review, thank you all!
> - access indirect_shadow_pages in the protection of mmu-lock
> - fix the issue when unhandleable instruction access on large page
> - add a new test case for large page
> 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, these cases can not be detected:
> - for tdp used
> currently, it refused to retry all instructions. If nested npt is used, the
> emulation may be caused by shadow page, it can be fixed by unshadow the
> shadow page.
> - for shadow mmu
> some cases are nested-write-protect, for example, 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.
> There are two test cases based on kvm-unit-test can trigger a infinite loop on
> current code (ept = 0), after this patchset, it can report the error to Qemu.
> Subject: [PATCH] access test: test unhandleable instruction
> Test the instruction which can not be handled by kvm
> Signed-off-by: Xiao Guangrong <>

Please submit the test for inclusion. There should be some way to make
it fail.. program a timer interrupt and #GP?

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