From: Juergen Gross Date: Fri, 25 Sep 2020 14:07:51 +0000 (+0200) Subject: x86/xen: disable Firmware First mode for correctable memory errors X-Git-Tag: v5.8.18~19 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b9cc04b049d85bc1597bfe4512937424b1e60401;p=thirdparty%2Fkernel%2Fstable.git x86/xen: disable Firmware First mode for correctable memory errors 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 Reviewed-by: Boris Ostrovsky Link: https://lore.kernel.org/r/20200925140751.31381-1-jgross@suse.com Signed-off-by: Boris Ostrovsky Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index c46b9f2e732ff..6e39eda00c2c9 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -1438,6 +1438,15 @@ asmlinkage __visible void __init xen_start_kernel(void) 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 } if (!boot_params.screen_info.orig_video_isVGA)