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Re: [PATCH v3 2/4] x86/ioapic: RTE modifications must use ioapic_write_entry
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 27 Jul 2023 14:19:02 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 27 Jul 2023 12:19:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26.07.2023 14:55, Roger Pau Monne wrote:
> Do not allow to write to RTE registers using io_apic_write and instead
> require changes to RTE to be performed using ioapic_write_entry.
>
> This is in preparation for passing the full contents of the RTE to the
> IOMMU interrupt remapping handlers, so remapping entries for IO-APIC
> RTEs can be updated atomically when possible.
>
> While immediately this commit might expand the number of MMIO accesses
> in order to update an IO-APIC RTE, further changes will benefit from
> getting the full RTE value passed to the IOMMU handlers, as the logic
> is greatly simplified when the IOMMU handlers can get the complete RTE
> value in one go.
>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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