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Re: [PATCH v1] CHANGELOG.md: Mention PCI passthrough for HVM domUs
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 13 Mar 2025 08:42:25 +0100
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- Cc: Jiqian Chen <Jiqian.Chen@xxxxxxx>, Community Manager <community.manager@xxxxxxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, Huang Rui <ray.huang@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 13 Mar 2025 07:42:42 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 12.03.2025 17:36, Roger Pau Monné wrote:
> On Wed, Mar 12, 2025 at 09:51:09AM +0100, Jan Beulich wrote:
>> On 12.03.2025 05:02, Jiqian Chen wrote:
>>> PCI passthrough is already supported for HVM domUs when dom0 is PVH
>>> on x86. The last related patch on Qemu side was merged after Xen4.20
>>> release. So mention this feature in Xen4.21 entry.
>>>
>>> Signed-off-by: Jiqian Chen <Jiqian.Chen@xxxxxxx>
>>> ---
>>> CHANGELOG.md | 1 +
>>> 1 file changed, 1 insertion(+)
>>>
>>> diff --git a/CHANGELOG.md b/CHANGELOG.md
>>> index 7201c484f899..b6de9b72ea7a 100644
>>> --- a/CHANGELOG.md
>>> +++ b/CHANGELOG.md
>>> @@ -12,6 +12,7 @@ The format is based on [Keep a
>>> Changelog](https://keepachangelog.com/en/1.0.0/)
>>> - On x86:
>>> - Option to attempt to fixup p2m page-faults on PVH dom0.
>>> - Resizable BARs is supported for PVH dom0.
>>> + - Support PCI passthrough for HVM domUs when dom0 is PVH.
>>
>> Aren't we still in need of SR-IOV support in order to make such an
>> unconditional statement?
>
> I view SR-IOV as kind of orthogonal to this: SR-IOV is not
> supported at all on PVH dom0, so it's not just pass through, but the
> capability itself that won't work as expected when using such devices.
Hmm, yes and no. No in so far as I as someone who simply wants to use Xen
would read the above statement as indicating full pass-through support.
Which first and foremost includes the passing through of VFs.
Jan
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