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Re: SR-IOV: do we need to virtualize in Xen or rely on Dom0?
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>
- Date: Thu, 10 Jun 2021 11:45:49 +0000
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 10 Jun 2021 11:46:01 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHXWQwW/O3obtZgqkmpGRvt7ZNDkasM6aMAgAAjXoCAAA0jAIAAEBMA
- Thread-topic: SR-IOV: do we need to virtualize in Xen or rely on Dom0?
Hi, Jan!
On 10.06.21 13:48, Jan Beulich wrote:
> 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.
Fair enough. Do you think we would also need to re-work the existing code
in Xen to support normal devices (not SR-IOV), e.g. we currently rely on
PHYSDEVOP_XXX and other Linux specifics. And even if SR-IOV is implemented
in Xen this won't allow those OSes to stay unmodified, including FreeBSD.
Is my understanding correct?
>
> Jan
>
Thank you,
Oleksandr
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