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Re: [PATCH v2 0/2] Add support for MSI injection on Arm
- To: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>
- From: Mykyta Poturai <Mykyta_Poturai@xxxxxxxx>
- Date: Wed, 16 Apr 2025 08:37:14 +0000
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 16 Apr 2025 08:37:26 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHbrSLDj7RBwKKgz0m9mJin+yPd5rOi+rAAgAJZvwCAAKbLgA==
- Thread-topic: [PATCH v2 0/2] Add support for MSI injection on Arm
On 16.04.25 01:40, Stefano Stabellini wrote:
> On Mon, 14 Apr 2025, Julien Grall wrote:
>> Hi Mykyta,
>>
>> On 14/04/2025 18:51, Mykyta Poturai wrote:
>>> This series adds the base support for MSI injection on Arm. This is
>>> needed to streamline virtio-pci interrupt triggering.
>>>
>>> With this patches, MSIs can be triggered in guests by issuing the new
>>> DM op, inject_msi2. This op is similar to inject_msi, but it allows
>>> to specify the source id of the MSI.
>>>
>>> We chose the approach of adding a new DM op instead of using the pad
>>> field of inject_msi because we have no clear way of distinguishing
>>> between set and unset pad fields. New implementations also adds flags
>>> field to clearly specify if the SBDF is set.
>>>
>>> Patches were tested on QEMU with
>>
>> [...]
>>
>>> patches for ITS support for DomUs applied.
>>
>> This means this series is unusable without external patches. Given this is
>> adding a new DM operations, I think it would be more sensible to have the
>> vITS
>> support merged first. Then we can look at merging this series.
>
> Hi Mykyta, just checking explicitly with you whether this series
> requires vgic-v3-its.c for DomUs?
>
> If yes, how far are you from sending the relevant patches to xen-devel?
> How many are they?
Hi Stefano,
Yes, I am planning to send them together with VPCI MSI support after
SMMU patches are merged.
Although the DomU vits itself is only two patches.
1.
https://github.com/Deedone/xen/commit/c7fe54e776e4205fbb993e47a6b826f5154fad76
2.
https://github.com/Deedone/xen/commit/b6b4ffadb368f540a0ae8ef6b4572f0cfd2eccaa
--
Mykyta
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