Re: [Xen-devel] [PATCH v2] x86/HVM: use available linear->phys translations in REP MOVS/STOS handling

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

On 21 June 2016, at 20:50, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:

>
>
>On 20/06/16 12:29, Jan Beulich wrote:
>> If we have the translation result available already, we should also use
>> it here. In my tests with Linux guests this eliminates all calls to
>> hvmemul_linear_to_phys() from the STOS path and most from the MOVS one.
>>
>> Also record the translation for re-use at least during response
>> processing.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>This patch is still broken.  All XenServer HVM guests (both windows and
>linux) are dying, with Qemu citing
>I/O request not read: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0
>The domain still exists, but it looks like it never gets unpaused from
>the device model request.

I think that error is normal. The first time QEMU scans the ioreq pages it sees them blank. The lack of unpause, of course, is not normal.

  Paul

>~Andrew
>

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