Re: [PATCH for-4.20? v2 0/5] xen/x86: prevent local APIC errors at shutdown

["Roger Pau Monné" <roger.pau@citrix.com>]

Hello,

This should have had a 'for-4.20?' tag in the subject name, as
otherwise we will need to add an errata to the release notes to notice
that reboot can sometimes fail on AMD boxes.

Also adding Oleksii.

Thanks, Roger.

On Thu, Feb 06, 2025 at 04:06:10PM +0100, Roger Pau Monne wrote:
> Hello,
> 
> The following series aims to prevent local APIC errors from stalling the
> shtudown process.  On XenServer testing we have seen reports of AMD
> boxes sporadically getting stuck in a spam of:
> 
> APIC error on CPU0: 00(08), Receive accept error
> 
> Messages during shutdown, as a result of device interrupts targeting
> CPUs that are offline (and have the local APIC disabled).
> 
> First patch strictly solves the issue of shutdown getting stuck, further
> patches aim to quiesce interrupts from all devices (known by Xen) as an
> attempt to prevent a spurious "APIC error on CPU0: 00(00)" plus also
> make kexec more reliable.
> 
> Thanks, Roger.
> 
> Roger Pau Monne (5):
>   x86/shutdown: offline APs with interrupts disabled on all CPUs
>   x86/irq: drop fixup_irqs() parameters
>   x86/smp: perform disabling on interrupts ahead of AP shutdown
>   x86/pci: disable MSI(-X) on all devices at shutdown
>   x86/iommu: disable interrupts at shutdown
> 
>  xen/arch/x86/crash.c                        |  2 ++
>  xen/arch/x86/include/asm/irq.h              |  4 +--
>  xen/arch/x86/include/asm/msi.h              |  1 +
>  xen/arch/x86/irq.c                          | 30 ++++++++-----------
>  xen/arch/x86/msi.c                          | 18 +++++++++++
>  xen/arch/x86/smp.c                          | 33 +++++++++++++++------
>  xen/arch/x86/smpboot.c                      |  2 +-
>  xen/drivers/passthrough/amd/iommu.h         |  1 +
>  xen/drivers/passthrough/amd/iommu_init.c    | 17 +++++++++++
>  xen/drivers/passthrough/amd/pci_amd_iommu.c |  1 +
>  xen/drivers/passthrough/iommu.c             |  6 ++++
>  xen/drivers/passthrough/pci.c               | 33 +++++++++++++++++++++
>  xen/drivers/passthrough/vtd/iommu.c         | 19 ++++++++++++
>  xen/include/xen/iommu.h                     |  3 ++
>  xen/include/xen/pci.h                       |  4 +++
>  15 files changed, 145 insertions(+), 29 deletions(-)
> 
> -- 
> 2.46.0
>