Re: [Xen-devel] [PATCH for-4.8] libxc/x86: Report consistent initial APIC value for PV guests

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 11.11.16 at 16:16, <wei.liu2@xxxxxxxxxx> wrote:
> On Thu, Nov 10, 2016 at 09:50:24AM -0500, Boris Ostrovsky wrote:
>> Currently hypervisor provides PV guest's CPUID(1).EBX[31:24] (initial
>> APIC ID) with contents of that field on the processor that launched
>> the guest. This results in the guest reporting different initial
>> APIC IDs across runs.
>> 
>> We should be consistent in how this value is reported, let's set
>> it to 0 (which is also what Linux guests expect).
>> 
>> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> 
> I will defer this to x86 maintainers.

Changing from a random (wrong) value to a deterministic (but still
wrong) value certainly won't make things worse. IOW the patch
can have my ack if needed, but I thought I had seen Andrew
already give his.

Jan


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