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Re: [PATCH v5 1/3] x86/vmx: fix posted interrupts usage of msi_desc->msg field
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 11 Mar 2025 16:46:15 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 11 Mar 2025 15:46:22 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.03.2025 16:27, Roger Pau Monne wrote:
> The current usage of msi_desc->msg in vmx_pi_update_irte() will make the
> field contain a translated MSI message, instead of the expected
> untranslated one. This breaks dump_msi(), that use the data in
> msi_desc->msg to print the interrupt details.
>
> Fix this by introducing a dummy local msi_msg, and use it with
> iommu_update_ire_from_msi(). vmx_pi_update_irte() relies on the MSI
> message not changing, so there's no need to propagate the resulting msi_msg
> to the hardware, and the contents can be ignored.
>
> Additionally add a comment to clarify that msi_desc->msg must always
> contain the untranslated MSI message.
>
> Fixes: a5e25908d18d ('VT-d: introduce new fields in msi_desc to track binding
> with guest interrupt')
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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