x86, AMD, MCE thresholding: Fix the MCi_MISCj iteration order

commit 6dcbfe4f0b4e17e289d56fa534b7ce5a6b7f63a3 upstream.

This fixes possible cases of not collecting valid error info in
the MCE error thresholding groups on F10h hardware.

The current code contains a subtle problem of checking only the
Valid bit of MSR0000_0413 (which is MC4_MISC0 - DRAM
thresholding group) in its first iteration and breaking out if
the bit is cleared.

But (!), this MSR contains an offset value, BlkPtr[31:24], which
points to the remaining MSRs in this thresholding group which
might contain valid information too. But if we bail out only
after we checked the valid bit in the first MSR and not the
block pointer too, we miss that other information.

The thing is, MC4_MISC0[BlkPtr] is not predicated on
MCi_STATUS[MiscV] or MC4_MISC0[Valid] and should be checked
prior to iterating over the MCI_MISCj thresholding group,
irrespective of the MC4_MISC0[Valid] setting.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c
index 83a3d1f4efca9ff447e0e2b2f902d4c7d4d16248..8387792a696b025a4b34acb3ea90bd50670a4aff 100644 (file)
--- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
@@ -140,6 +140,7 @@ void mce_amd_feature_init(struct cpuinfo_x86 *c)
                                address = (low & MASK_BLKPTR_LO) >> 21;
                                if (!address)
                                        break;
+
                                address += MCG_XBLK_ADDR;
                        } else
                                ++address;
@@ -147,12 +148,8 @@ void mce_amd_feature_init(struct cpuinfo_x86 *c)
                        if (rdmsr_safe(address, &low, &high))
                                break;
 
-                       if (!(high & MASK_VALID_HI)) {
-                               if (block)
-                                       continue;
-                               else
-                                       break;
-                       }
+                       if (!(high & MASK_VALID_HI))
+                               continue;
 
                        if (!(high & MASK_CNTP_HI)  ||
                             (high & MASK_LOCKED_HI))