linux-kernel - Re: [LINUX PATCH 2/2] xen/pvhvm: Support more than 32 VCPUs when migrating.

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Date:	Wed, 09 Apr 2014 11:21:03 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>
Cc:	<david.vrabel@...rix.com>, <konrad@...nel.org>,
	<xen-devel@...ts.xenproject.org>, <boris.ostrovsky@...cle.com>,
	<linux-kernel@...r.kernel.org>, <keir@....org>
Subject: Re: [LINUX PATCH 2/2] xen/pvhvm: Support more than 32 VCPUs
 when migrating.

>>> On 09.04.14 at 12:15, <konrad.wilk@...cle.com> wrote:

> On Apr 9, 2014 4:03 AM, Jan Beulich <JBeulich@...e.com> wrote:
>>
>> >>> On 08.04.14 at 19:25, <konrad@...nel.org> wrote: 
>> > + /* Only Xen 4.5 and higher supports this. */ 
>> > + if (HYPERVISOR_vcpu_op(VCPUOP_is_up, smp_processor_id(), NULL) == 
> -ENOSYS) 
>> > + vcpuops = false; 
>>
>> Did you mean to say "for HVM guests" in the comment? And of 
>> course the comment could quickly become stale if we backported 
>> the Xen side change to e.g. 4.4.1. 
>>
> 
> Right. But I thought that features like that (new hypercalls) wasn't 
> applicable for backporting?

It's not really a new hypercall, and fixing a problem, so I'd consider
it a candidate at least for 4.4.1.

Jan

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