x86/MCE/AMD: Read MCx_MISC block addresses on any CPU

We used rdmsr_safe_on_cpu() to make sure we're reading the proper CPU's
MISC block addresses. However, that caused trouble with CPU hotplug due to
the _on_cpu() helper issuing an IPI while IRQs are disabled.

But we don't have to do that: the block addresses are the same on any CPU
so we can read them on any CPU. (What practically happens is, we read them
on the BSP and cache them, and for later reads, we service them from the
cache).

Suggested-by: Yazen Ghannam <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>

Author: suryasaimadhu

arch/x86/kernel/cpu/mcheck/mce_amd.c

@@ -436,8 +436,7 @@ static void deferred_error_interrupt_enable(struct cpuinfo_x86 *c)
 	wrmsr(MSR_CU_DEF_ERR, low, high);
 }
 
-static u32 smca_get_block_address(unsigned int cpu, unsigned int bank,
-				  unsigned int block)
+static u32 smca_get_block_address(unsigned int bank, unsigned int block)
 {
 	u32 low, high;
 	u32 addr = 0;
@@ -456,13 +455,13 @@ static u32 smca_get_block_address(unsigned int cpu, unsigned int bank,
 	 * For SMCA enabled processors, BLKPTR field of the first MISC register
 	 * (MCx_MISC0) indicates presence of additional MISC regs set (MISC1-4).
 	 */
-	if (rdmsr_safe_on_cpu(cpu, MSR_AMD64_SMCA_MCx_CONFIG(bank), &low, &high))
+	if (rdmsr_safe(MSR_AMD64_SMCA_MCx_CONFIG(bank), &low, &high))
 		goto out;
 
 	if (!(low & MCI_CONFIG_MCAX))
 		goto out;
 
-	if (!rdmsr_safe_on_cpu(cpu, MSR_AMD64_SMCA_MCx_MISC(bank), &low, &high) &&
+	if (!rdmsr_safe(MSR_AMD64_SMCA_MCx_MISC(bank), &low, &high) &&
 	    (low & MASK_BLKPTR_LO))
 		addr = MSR_AMD64_SMCA_MCx_MISCy(bank, block - 1);
 
@@ -471,7 +470,7 @@ static u32 smca_get_block_address(unsigned int cpu, unsigned int bank,
 	return addr;
 }
 
-static u32 get_block_address(unsigned int cpu, u32 current_addr, u32 low, u32 high,
+static u32 get_block_address(u32 current_addr, u32 low, u32 high,
 			     unsigned int bank, unsigned int block)
 {
 	u32 addr = 0, offset = 0;
@@ -480,7 +479,7 @@ static u32 get_block_address(unsigned int cpu, u32 current_addr, u32 low, u32 hi
 		return addr;
 
 	if (mce_flags.smca)
-		return smca_get_block_address(cpu, bank, block);
+		return smca_get_block_address(bank, block);
 
 	/* Fall back to method we used for older processors: */
 	switch (block) {
@@ -558,7 +557,7 @@ void mce_amd_feature_init(struct cpuinfo_x86 *c)
 			smca_configure(bank, cpu);
 
 		for (block = 0; block < NR_BLOCKS; ++block) {
-			address = get_block_address(cpu, address, low, high, bank, block);
+			address = get_block_address(address, low, high, bank, block);
 			if (!address)
 				break;
 
@@ -1175,7 +1174,7 @@ static int allocate_threshold_blocks(unsigned int cpu, unsigned int bank,
 	if (err)
 		goto out_free;
 recurse:
-	address = get_block_address(cpu, address, low, high, bank, ++block);
+	address = get_block_address(address, low, high, bank, ++block);
 	if (!address)
 		return 0;