Patch-mainline: v5.10-rc1
Git-commit: d759af38572f97321112a0852353613d18126038
References: bsc#1176713
From: Juergen Gross <jgross@suse.com>
Date: Fri, 25 Sep 2020 16:07:51 +0200
Subject: [PATCH] x86/xen: disable Firmware First mode for correctable memory
errors
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>
---
arch/x86/xen/enlighten_pv.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 22e741e0b10c..351ac1a9a119 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -1376,6 +1376,15 @@ 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
}
#ifdef CONFIG_PCI
/* PCI BIOS service won't work from a PV guest. */
--
2.26.2