Re: [Xen-devel] [PATCH v2 02/30] xen/x86: remove XENFEAT_hvm_pirqs for PVHv2 guests

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 29.09.16 at 16:17, <roger.pau@xxxxxxxxxx> wrote:
> On Wed, Sep 28, 2016 at 10:03:21AM -0600, Jan Beulich wrote:
>> >>> On 27.09.16 at 17:56, <roger.pau@xxxxxxxxxx> wrote:
>> > On PVHv2 guests we explicitly want to use native methods for routing
>> > interrupts.
>> > 
>> > Introduce a new XEN_X86_EMU_USE_PIRQ to notify Xen whether a HVM guest can
>> > route physical interrupts (even from emulated devices) over event channels.
>> 
>> So you specifically want this new flag off for PVHv2 guests? Based on
>> just this description I did get the opposite impression...
> 
> Yes, that's right, I don't want PVHv2 guests to know anything about PIRQs. I 
> 
> don't really know how to reword this, what about:
> 
> "PVHv2 guests, unlike HVM guests, won't have the option to route interrupts 
> from physical or emulated devices over event channels using PIRQs. This 
> applies to both DomU and Dom0 PVHv2 guests.
> 
> Introduce a new XEN_X86_EMU_USE_PIRQ to notify Xen whether a HVM guest can
> route physical interrupts (even from emulated devices) over event channels, 
> and is thus allowed to use some of the PHYSDEV ops."

SGTM

Jan


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