Re: [Xen-devel] [PATCH] x86/vlapic: Don't reset APIC mode/ID when handling INIT signal

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 19.04.17 at 06:56, <chao.gao@xxxxxxxxx> wrote:
> On Wed, Apr 19, 2017 at 02:48:57AM -0600, Jan Beulich wrote:
>>>>> On 18.04.17 at 23:51, <chao.gao@xxxxxxxxx> wrote:
>>> HVM guest can't enable x2apic as XENFEAT_hvm_pirqs is exposed to it.
>>> Why we have this restriction? As a consequence, This patch isn't
>>> tested in that case.
>>
>>HVM guests very well can use x2APIC, I'm seeing them use it all
>>the time. Please be more specific with your question.
> 
> OK. I failed to enable guest's x2apic, with the output: IRQ Remapping doesn't
> support X2APIC mode. Eventually, I found the xen_x2apic_para_available()
> in linux kernel and it returns false when Xen exposes XENFEAT_hvm_pirqs to
> guest.

Looks more like a Linux/pvops question, which I continue to not
really be an expert on. Let's ask the maintainers (now Cc-ed)
(but it may well be that this simply depends on whether you
enable PVHVM mode)...

Jan


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