From: Juergen Gross jgross@suse.com
commit d759af38572f97321112a0852353613d18126038 upstream.
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@vger.kernel.org Signed-off-by: Juergen Gross jgross@suse.com Reviewed-by: Boris Ostrovsky boris.ostrovsky@oracle.com Link: https://lore.kernel.org/r/20200925140751.31381-1-jgross@suse.com Signed-off-by: Boris Ostrovsky boris.ostrovsky@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/xen/enlighten_pv.c | 9 +++++++++ 1 file changed, 9 insertions(+)
--- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -1404,6 +1404,15 @@ asmlinkage __visible void __init xen_sta x86_init.mpparse.get_smp_config = x86_init_uint_noop;
xen_boot_params_init_edd(); + +#ifdef CONFIG_ACPI + /* + * Disable selecting "Firmware First mode" for correctable + * memory errors, as this is the duty of the hypervisor to + * decide. + */ + acpi_disable_cmcff = 1; +#endif } #ifdef CONFIG_PCI /* PCI BIOS service won't work from a PV guest. */