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[PATCH 2/3] x86/Intel: skip CORE_THREAD_COUNT read on family 0xf
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 10 Feb 2022 15:56:12 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 10 Feb 2022 14:56:19 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
This avoids an unnecessary (and always somewhat scary) log message for
the recovered from #GP(0).
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
Perhaps even use "== 6" in the family check?
--- a/xen/arch/x86/spec_ctrl.c
+++ b/xen/arch/x86/spec_ctrl.c
@@ -453,7 +453,8 @@ static bool __init check_smt_enabled(voi
* At the time of writing, it is almost completely undocumented, so isn't
* virtualised reliably.
*/
- if ( boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && !cpu_has_hypervisor &&
+ if ( boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
+ boot_cpu_data.x86 != 0xf && !cpu_has_hypervisor &&
!rdmsr_safe(MSR_INTEL_CORE_THREAD_COUNT, val) )
return (MASK_EXTR(val, MSR_CTC_CORE_MASK) !=
MASK_EXTR(val, MSR_CTC_THREAD_MASK));
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