[Xen-devel] [PATCH] x86/MCE: Present MSR_IA32_MCx_MISC(2-6) as invalid on AMD

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

MSR_IA32_MCx_MISC(4) register on AMD processors is used for error
thresholding. PV guests may try to set it up for threshold
interrupts which will fail and result in these warnings in the log:

  [Firmware Bug]: cpu 0, try to use APIC510 (LVT offset 1) for vector
  0xf9, but the register is already in use for vector 0x0 on this cpu

Mark this register as invalid to avoid this. While at it, also present
other MSR_IA32_MCx_MISC() registers as invalid (except for the first
GUEST_MC_BANK_NUM which are emulated).

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
 xen/arch/x86/cpu/mcheck/mce.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/cpu/mcheck/mce.h b/xen/arch/x86/cpu/mcheck/mce.h
index f2aeacb..d6526a4 100644
--- a/xen/arch/x86/cpu/mcheck/mce.h
+++ b/xen/arch/x86/cpu/mcheck/mce.h
@@ -166,6 +166,7 @@ static inline int mce_vendor_bank_msr(const struct vcpu *v, 
uint32_t msr)
         case MSR_F10_MC4_MISC1:
         case MSR_F10_MC4_MISC2:
         case MSR_F10_MC4_MISC3:
+        case MSR_IA32_MCx_MISC(GUEST_MC_BANK_NUM)...MSR_IA32_MCx_MISC(6):
             return 1;
         }
         break;
-- 
1.8.1.2


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