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[PATCH 3/4] x86/hvm: Remove cross-vendor checks from MSR handlers.
- To: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
- Date: Thu, 22 Jan 2026 17:49:39 +0100
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- Cc: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 22 Jan 2026 16:50:24 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Not a functional change now that cross-vendor guests are not launchable.
Signed-off-by: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
---
xen/arch/x86/msr.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/xen/arch/x86/msr.c b/xen/arch/x86/msr.c
index ad75a2e108..c9cc4f0692 100644
--- a/xen/arch/x86/msr.c
+++ b/xen/arch/x86/msr.c
@@ -169,9 +169,9 @@ int guest_rdmsr(struct vcpu *v, uint32_t msr, uint64_t *val)
break;
case MSR_IA32_PLATFORM_ID:
- if ( !(cp->x86_vendor & X86_VENDOR_INTEL) ||
- !(boot_cpu_data.x86_vendor & X86_VENDOR_INTEL) )
+ if ( cp->x86_vendor != X86_VENDOR_INTEL )
goto gp_fault;
+
rdmsrl(MSR_IA32_PLATFORM_ID, *val);
break;
@@ -190,8 +190,6 @@ int guest_rdmsr(struct vcpu *v, uint32_t msr, uint64_t *val)
* the guest.
*/
if ( !(cp->x86_vendor & (X86_VENDOR_INTEL | X86_VENDOR_AMD)) ||
- !(boot_cpu_data.x86_vendor &
- (X86_VENDOR_INTEL | X86_VENDOR_AMD)) ||
rdmsr_safe(MSR_AMD_PATCHLEVEL, val) )
goto gp_fault;
break;
--
2.43.0
|
