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Re: SR-IOV: do we need to virtualize in Xen or rely on Dom0?

  • To: Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Thu, 10 Jun 2021 12:48:16 +0200
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  • Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Thu, 10 Jun 2021 10:48:37 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 10.06.2021 12:01, Oleksandr Andrushchenko wrote:
> On 10.06.21 10:54, Roger Pau Monné wrote:
>> OTOH if we properly trap accesses to the SR-IOV capability (like it
>> was proposed in [1] from your references) we won't have to modify OSes
>> that want to run as hardware domains in order to handle SR-IOV devices.
> Out of curiosity, could you please name a few? I do understand that
> we do want to support unmodified OSes and this is indeed important.
> But, still what are the other OSes which do support Xen + PCI passthrough?

I think Roger saying "want" meant to cover ones which currently don't,
and which would have to undergo more extensive changes if they were to
be enabled.




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