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charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) 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 Monn=C3=A9 Acked-by: Jan Beulich --- 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; =20 + case MSR_IA32_THERM_STATUS: + if ( cp->x86_vendor !=3D X86_VENDOR_INTEL ) + goto gp_fault; + *val =3D 0; + break; + case MSR_X2APIC_FIRST ... MSR_X2APIC_LAST: if ( !is_hvm_domain(d) || v !=3D curr ) goto gp_fault; --=20 2.28.0