[xen staging] x86/msr: handle IA32_THERM_STATUS

[patchbot@xxxxxxx]

commit 628055822452f8678c18193835fdc1e2c20d4d14
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Wed Oct 14 14:10:08 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Oct 14 14:10:08 2020 +0200

    x86/msr: handle IA32_THERM_STATUS
    
    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.pau@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 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 81b34fb212..9c69ef8792 100644
--- a/xen/arch/x86/msr.c
+++ b/xen/arch/x86/msr.c
@@ -242,6 +242,12 @@ int guest_rdmsr(struct vcpu *v, uint32_t msr, uint64_t 
*val)
             goto gp_fault;
         break;
 
+    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;
--
generated by git-patchbot for /home/xen/git/xen.git#staging