Re: [Xen-devel] support for more than 32 VCPUs when migrating PVHVM guest

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 02/02/15 10:47, Vitaly Kuznetsov wrote:
> Hi Konrad,
>
> I just hit an issue with PVHVM guests after save/restore (or migration),
> if a PVHVM guest has > 32 VCPUs it hangs. Turns out, you saw it almost a
> year ago and even wrote patches to call VCPUOP_register_vcpu_info after
> resume. Unfortunately these patches never made it to xen/kernel. Do you
> have a plan to pick this up? What were the arguments against your
> suggestion?

32 VCPUs is the legacy limit for HVM guests, but should not have any
remaining artefacts these days.

Do you know why the hang occurs?  I can't spot anything in the legacy
migration code which would enforce such a limit.

What is the subject of the thread you reference so I can search for it?

~Andrew


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