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Re: [PATCH v1 0/3] vpci/msix: separate out common MSI-X code
- To: Mykyta Poturai <Mykyta_Poturai@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 27 Oct 2026 11:21:28 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Jason Andryuk <jason.andryuk@xxxxxxx>, Stewart Hildebrand <stewart.hildebrand@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 27 Oct 2026 10:21:33 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 27.10.2026 10:39, Mykyta Poturai wrote:
> On 10/26/26 2:34 PM, Jan Beulich wrote:
>> On 26.10.2026 13:27, Mykyta Poturai wrote:
>>> This is preparatory work to make vPCI MSI-X functional on Arm. Split the
>>> vPCI MSI-X code so that intercepting the MSI-X table and PBA stays x86
>>> only,
>>
>> This likely is related to peculiarities of Arm's interrupt handling, yet
>> on the surface I can't see why not intercepting MSI-X table accesses
>> would be safe. Would it be possible to extend background here a little?
>
> On Arm most of the work is done by the ITS, so the only thing the device
> needs to write to the doorbell register is the EventID. Interrupt
> translation is fully configured in the ITS; it will reject invalid
> EventIDs and also has a sideband DeviceID, so misconfigured devices
> cannot trigger each other's interrupts. Memory-wise everything is gated
> by the IOMMU, so a wrong doorbell address would not pose any risk either.
And a guest fiddling with the mask bits behind Xen's back isn't a problem
either?
Jan
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