Windows 8 will attempt to read MSR_IA32_THERM_STATUS and panic if a
#GP fault is injected as a result:
vmx.c:3035:d8v0 RDMSR 0x0000019c unimplemented
d8v0 VIRIDIAN CRASH: 3b c0000096 fffff8061de31651 fffff4088a613720 0
So handle the MSR and return 0 instead.
Note that this is done on the generic MSR handler, and PV guest will
also get 0 back when trying to read the MSR. There doesn't seem to be
much value in handling the MSR for HVM guests only.
Fixes: 84e848fd7a1 ('x86/hvm: disallow access to unknown MSRs')
Signed-off-by: Roger Pau Monné <roger....@citrix.com>
---
xen/arch/x86/msr.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/xen/arch/x86/msr.c b/xen/arch/x86/msr.c
index e4c4fa6127..190d6ac6c5 100644
--- a/xen/arch/x86/msr.c
+++ b/xen/arch/x86/msr.c
@@ -253,6 +253,12 @@ int guest_rdmsr(struct vcpu *v, uint32_t msr, uint64_t
*val)
break;
goto gp_fault;
+ case MSR_IA32_THERM_STATUS:
+ if ( cp->x86_vendor != X86_VENDOR_INTEL )
+ goto gp_fault;
+ *val = 0;
+ break;
+
case MSR_X2APIC_FIRST ... MSR_X2APIC_LAST:
if ( !is_hvm_domain(d) || v != curr )
goto gp_fault;
--
2.28.0
