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 <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>

diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 6d4d8a5700b71c0e6dcae0d168a563911926cbcb..3e66feff524a80b9258eb9a194f471c8a8774467 100644 (file)
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -1382,6 +1382,15 @@ 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)