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xen-devel
Re: [Xen-devel] [PATCH] retry instruction on svm emulation failure
I don't think we can take this patch before understanding what is going
on. As Keir said, could you share a sample code or failure case? so we
can debug it.
Thanks,
-Wei
On 05/18/2011 05:08 AM, Keir Fraser wrote:
On 18/05/2011 10:05, "Paolo Bonzini"<pbonzini@xxxxxxxxxx> wrote:
retry instruction on svm emulation failure
Upon emulation failure, Xen injects a #GP into the guest on AMD machines.
However, this kind of #GP does not happen in hardware. It is possible
(and was observed in practice) that the failure is transient. It will
go away naturally if the instruction is retried, because the guest will
be executing other code and will not exit.
It begs the question why we were emulating the instruction in the first
place. I'd like to see further explanation, with a concrete example, before
applying this patch. Or get an Ack from an AMD maintainer.
-- Keir
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