Re: [PATCH v2] x86/xen: disable Firmware First mode for correctable memory errors

[boris.ostrovsky@xxxxxxxxxx]

On 9/25/20 10:07 AM, Juergen Gross wrote:
> When running as Xen dom0 the kernel isn't responsible for selecting the
> error handling mode, this should be handled by the hypervisor.
>
> So disable setting FF mode when running as Xen pv guest. Not doing so
> might result in boot splats like:
>
> [    7.509696] HEST: Enabling Firmware First mode for corrected errors.
> [    7.510382] mce: [Firmware Bug]: Ignoring request to disable invalid MCA 
> bank 2.
> [    7.510383] mce: [Firmware Bug]: Ignoring request to disable invalid MCA 
> bank 3.
> [    7.510384] mce: [Firmware Bug]: Ignoring request to disable invalid MCA 
> bank 4.
> [    7.510384] mce: [Firmware Bug]: Ignoring request to disable invalid MCA 
> bank 5.
> [    7.510385] mce: [Firmware Bug]: Ignoring request to disable invalid MCA 
> bank 6.
> [    7.510386] mce: [Firmware Bug]: Ignoring request to disable invalid MCA 
> bank 7.
> [    7.510386] mce: [Firmware Bug]: Ignoring request to disable invalid MCA 
> bank 8.
>
> Reason is that the HEST ACPI table contains the real number of MCA
> banks, while the hypervisor is emulating only 2 banks for guests.
>
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>


Applied to for-linus-5.10



-boris