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Subject[GIT PULL] RAS urgent for 5.5
Hi Linus,

please pull three urgent RAS fixes for the AMD side of things:

- initialize struct mce.bank so that calculated error severity on AMD
SMCA machines is correct

- do not send IPIs early during bank initialization, when interrupts are
disabled

- a fix for when only a subset of MCA banks are enabled, which led to
boot hangs on some new AMD CPUs.

Thx.

---
The following changes since commit e42617b825f8073569da76dc4510bfa019b1c35a:

Linux 5.5-rc1 (2019-12-08 14:57:55 -0800)

are available in the Git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git ras-urgent-for-linus

for you to fetch changes up to a3a57ddad061acc90bef39635caf2b2330ce8f21:

x86/mce: Fix possibly incorrect severity calculation on AMD (2019-12-17 09:39:53 +0100)

----------------------------------------------------------------
Jan H. Schönherr (1):
x86/mce: Fix possibly incorrect severity calculation on AMD

Konstantin Khlebnikov (1):
x86/MCE/AMD: Do not use rdmsr_safe_on_cpu() in smca_configure()

Yazen Ghannam (1):
x86/MCE/AMD: Allow Reserved types to be overwritten in smca_banks[]

arch/x86/kernel/cpu/mce/amd.c | 4 ++--
arch/x86/kernel/cpu/mce/core.c | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index 5167bd2bb6b1..d6cf5c18a7e0 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -266,10 +266,10 @@ static void smca_configure(unsigned int bank, unsigned int cpu)
smca_set_misc_banks_map(bank, cpu);

/* Return early if this bank was already initialized. */
- if (smca_banks[bank].hwid)
+ if (smca_banks[bank].hwid && smca_banks[bank].hwid->hwid_mcatype != 0)
return;

- if (rdmsr_safe_on_cpu(cpu, MSR_AMD64_SMCA_MCx_IPID(bank), &low, &high)) {
+ if (rdmsr_safe(MSR_AMD64_SMCA_MCx_IPID(bank), &low, &high)) {
pr_warn("Failed to read MCA_IPID for bank %d\n", bank);
return;
}
diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index 5f42f25bac8f..2e2a421c8528 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -819,8 +819,8 @@ static int mce_no_way_out(struct mce *m, char **msg, unsigned long *validp,
if (quirk_no_way_out)
quirk_no_way_out(i, m, regs);

+ m->bank = i;
if (mce_severity(m, mca_cfg.tolerant, &tmp, true) >= MCE_PANIC_SEVERITY) {
- m->bank = i;
mce_read_aux(m, i);
*msg = tmp;
return 1;
--
Regards/Gruss,
Boris.

SUSE Software Solutions Germany GmbH, GF: Felix Imendörffer, HRB 36809, AG Nürnberg

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