Re: [Xen-devel] [PATCH v3.1 01/15] xen/x86: remove XENFEAT_hvm_pirqs for PVHv2 guests

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 29.10.16 at 10:59, <roger.pau@xxxxxxxxxx> wrote:
> 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.
> 
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

The patch looks fine now for its purpose, but I'm hesitant to ack it
without us having settled on whether we indeed mean to hide all
those physdev ops from Dom0. In particular I don't recall this (and
the reasoning behind it) having got written down somewhere.

Jan

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