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Re: [PATCH for-4.20 v4 4/5] x86/pci: disable MSI(-X) on all devices at shutdown
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 11 Feb 2025 18:00:37 +0100
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- Cc: oleksii.kurochko@xxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 11 Feb 2025 17:00:42 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.02.2025 15:48, Roger Pau Monne wrote:
> Attempt to disable MSI(-X) capabilities on all PCI devices know by Xen at
> shutdown. Doing such disabling should facilitate kexec chained kernel from
> booting more reliably, as device MSI(-X) interrupt generation should be
> quiesced.
>
> Only attempt to disable MSI(-X) on all devices in the crash context if the
> PCI lock is not taken, otherwise the PCI device list could be in an
> inconsistent state. This requires introducing a new pcidevs_trylock()
> helper to check whether the lock is currently taken.
>
> Disabling MSI(-X) should prevent "Receive accept error" being raised as a
> result of non-disabled interrupts targeting offline CPUs.
>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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