Re: [Xen-devel] [PATCH] xen: fix initialization of wallclock time for PVHVM on migration

[Roger Pau Monnà <roger.pau@xxxxxxxxxx>]

On 11/06/13 13:59, Jan Beulich wrote:
>>>> On 11.06.13 at 12:46, Roger Pau Monne <roger.pau@xxxxxxxxxx> wrote:
>> The initial values of the wallclock time in the shared info page are
>> set for PVHVM guests when the hypercall page is initialized, since the
>> hypercall page is not reinitialized on resume, the hypervisor
>> wallclock time is not properly set on resume.
>>
>> Fix it by forcing an update of the wallclock values when the shared
>> info page is mapped.
> 
> NACK - this is a guest side bug. After migration, a guest _has_ to
> re-init the hypercall page, as it may have got migrated between
> a VMX and an SVM machine, and the hypercall instructions are
> different between them.

AFAICS Linux doesn't seem to re-init the hypercall page, see
xen_arch_hvm_post_suspend at arch/x86/xen/suspend.c, but maybe I'm
missing something.

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