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Re: [Xen-devel] [PATCH] retry instruction on svm emulation failure
| To: | Paolo Bonzini <pbonzini@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] retry instruction on svm emulation failure |
| From: | Keir Fraser <keir.xen@xxxxxxxxx> |
| Date: | Wed, 18 May 2011 11:08:30 +0100 |
| Cc: | |
| Delivery-date: | Wed, 18 May 2011 03:09:14 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH] retry instruction on svm emulation failure |
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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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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