linux-kernel - [tip:ras/core] x86/mce/AMD: Read MSRs on the CPU allocating the threshold blocks

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Message-ID: <tip-cfee4f6f0b2026380c6bc6913dbd27943df17371@git.kernel.org>
Date:   Tue, 13 Sep 2016 06:29:47 -0700
From:   tip-bot for Yazen Ghannam <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de,
        Yazen.Ghannam@....com, bp@...e.de, mingo@...nel.org, hpa@...or.com
Subject: [tip:ras/core] x86/mce/AMD: Read MSRs on the CPU allocating the
 threshold blocks

Commit-ID:  cfee4f6f0b2026380c6bc6913dbd27943df17371
Gitweb:     http://git.kernel.org/tip/cfee4f6f0b2026380c6bc6913dbd27943df17371
Author:     Yazen Ghannam <Yazen.Ghannam@....com>
AuthorDate: Mon, 12 Sep 2016 09:59:31 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 13 Sep 2016 15:23:08 +0200

x86/mce/AMD: Read MSRs on the CPU allocating the threshold blocks

Scalable MCA systems allow non-core MCA banks to only be accessible by
certain CPUs. The MSRs for these banks are Read-as-Zero on other CPUs.

During allocate_threshold_blocks(), get_block_address() can be scheduled
on CPUs other than the one allocating the block. This causes the MSRs to
be read on the wrong CPU and results in incorrect behavior.

Add a @cpu parameter to get_block_address() and pass this in to ensure
that the MSRs are only read on the CPU that is allocating the block.

Signed-off-by: Yazen Ghannam <Yazen.Ghannam@....com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Link: http://lkml.kernel.org/r/1472673994-12235-2-git-send-email-Yazen.Ghannam@amd.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 arch/x86/kernel/cpu/mcheck/mce_amd.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c
index 419e0ee..9da92fb 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
@@ -293,7 +293,7 @@ static void deferred_error_interrupt_enable(struct cpuinfo_x86 *c)
 	wrmsr(MSR_CU_DEF_ERR, low, high);
 }
 
-static u32 get_block_address(u32 current_addr, u32 low, u32 high,
+static u32 get_block_address(unsigned int cpu, u32 current_addr, u32 low, u32 high,
 			     unsigned int bank, unsigned int block)
 {
 	u32 addr = 0, offset = 0;
@@ -309,13 +309,13 @@ static u32 get_block_address(u32 current_addr, u32 low, u32 high,
 			 */
 			u32 low, high;
 
-			if (rdmsr_safe(MSR_AMD64_SMCA_MCx_CONFIG(bank), &low, &high))
+			if (rdmsr_safe_on_cpu(cpu, MSR_AMD64_SMCA_MCx_CONFIG(bank), &low, &high))
 				return addr;
 
 			if (!(low & MCI_CONFIG_MCAX))
 				return addr;
 
-			if (!rdmsr_safe(MSR_AMD64_SMCA_MCx_MISC(bank), &low, &high) &&
+			if (!rdmsr_safe_on_cpu(cpu, MSR_AMD64_SMCA_MCx_MISC(bank), &low, &high) &&
 			    (low & MASK_BLKPTR_LO))
 				addr = MSR_AMD64_SMCA_MCx_MISCy(bank, block - 1);
 		}
@@ -421,12 +421,12 @@ out:
 void mce_amd_feature_init(struct cpuinfo_x86 *c)
 {
 	u32 low = 0, high = 0, address = 0;
-	unsigned int bank, block;
+	unsigned int bank, block, cpu = smp_processor_id();
 	int offset = -1;
 
 	for (bank = 0; bank < mca_cfg.banks; ++bank) {
 		for (block = 0; block < NR_BLOCKS; ++block) {
-			address = get_block_address(address, low, high, bank, block);
+			address = get_block_address(cpu, address, low, high, bank, block);
 			if (!address)
 				break;
 
@@ -544,15 +544,14 @@ static void amd_deferred_error_interrupt(void)
 static void amd_threshold_interrupt(void)
 {
 	u32 low = 0, high = 0, address = 0;
-	int cpu = smp_processor_id();
-	unsigned int bank, block;
+	unsigned int bank, block, cpu = smp_processor_id();
 
 	/* assume first bank caused it */
 	for (bank = 0; bank < mca_cfg.banks; ++bank) {
 		if (!(per_cpu(bank_map, cpu) & (1 << bank)))
 			continue;
 		for (block = 0; block < NR_BLOCKS; ++block) {
-			address = get_block_address(address, low, high, bank, block);
+			address = get_block_address(cpu, address, low, high, bank, block);
 			if (!address)
 				break;
 
@@ -774,7 +773,7 @@ static int allocate_threshold_blocks(unsigned int cpu, unsigned int bank,
 	if (err)
 		goto out_free;
 recurse:
-	address = get_block_address(address, low, high, bank, ++block);
+	address = get_block_address(cpu, address, low, high, bank, ++block);
 	if (!address)
 		return 0;