Commit-ID: 594a30fb12424717a41c62323d2a8bf167dbccad
Gitweb: http://git.kernel.org/tip/594a30fb12424717a41c62323d2a8bf167dbccad
Author: Hans de Goede <hdegoede@xxxxxxxxxx>
AuthorDate: Wed, 30 Aug 2017 12:58:11 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 31 Aug 2017 11:17:27 +0200
x86/apic: Silence "FW_BUG TSC_DEADLINE disabled due to Errata" on CPUs without the feature
When booting 4.13 on a VirtualBox VM on a Skylake host the following
error shows up in the logs:
[ 0.000000] [Firmware Bug]: TSC_DEADLINE disabled due to Errata;
please update microcode to version: 0xb2 (or later)
This is caused by apic_check_deadline_errata() only checking CPU model
and not the X86_FEATURE_TSC_DEADLINE_TIMER flag (which VirtualBox does
NOT export to the guest), combined with VirtualBox not exporting the
micro-code version to the guest.
This commit adds a check for X86_FEATURE_TSC_DEADLINE_TIMER to
apic_check_deadline_errata(), silencing this error on VirtualBox VMs.
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Frank Mehnert <frank.mehnert@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Michael Thayer <michael.thayer@xxxxxxxxxx>
Cc: Michal Necasek <michal.necasek@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Fixes: bd9240a18e ("x86/apic: Add TSC_DEADLINE quirk due to errata")
Link: http://lkml.kernel.org/r/20170830105811.27539-1-hdegoede@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/kernel/apic/apic.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index eebee4c..7834f73 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -597,9 +597,13 @@ static const struct x86_cpu_id deadline_match[] = {
static void apic_check_deadline_errata(void)
{
- const struct x86_cpu_id *m = x86_match_cpu(deadline_match);
+ const struct x86_cpu_id *m;
u32 rev;
+ if (!boot_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER))
+ return;
+
+ m = x86_match_cpu(deadline_match);
if (!m)
return;
--
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