[RFC PATCH] x86/intel: Add recent CPU models model-specific LBRs

["Teddy Astie" <teddy.astie@xxxxxxxxxx>]

Add all CPU models that supports these MSR as they are defined in February 2026 
SDM.
It uses the same list that span from Skylake to latest CPU models as a part of

    MSRs in the 6th—13th generation Intel® Core™ processors,
    1st—5th generation Intel® Xeon® Scalable processor families,
    Intel® Core™ Ultra 7 processors, 8th generation Intel® Core™ i3
    processors, Intel® Xeon® E processors, Intel® Xeon® 6 P-Core
    processors, Intel® Xeon® 6 E-Core processors, and Intel® Series 2
    Core™ Ultra processors

Signed-off-by: Teddy Astie <teddy.astie@xxxxxxxxxx>
---
Currently, none of these MSR are exposed on these CPUs, leading to BSOD [1]
in Windows when it is supposedly trying to debug some program.

I guess [2] is also caused by these missing MSRs.

[1] https://xcp-ng.org/forum/topic/12008/application-on-vm-causing-bsod
[2] 
https://lore.kernel.org/xen-devel/ced16fca-3b55-40a1-a7e2-ffadd9707394@xxxxxxxxxx/

 xen/arch/x86/hvm/vmx/vmx.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 82c55f49ae..98a25ce301 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -541,10 +541,26 @@ static const struct lbr_info *__init 
get_model_specific_lbr(void)
         case 0x8c: case 0x8d:
         /* Tremont */
         case 0x86:
+        /* Saphire Rapids */
+        case 0x8f:
         /* Kaby Lake */
         case 0x8e: case 0x9e:
+        /* Alder Lake */
+        case 0x97: case 0x9a:
         /* Comet Lake */
         case 0xa5: case 0xa6:
+        /* Meteor Lake */
+        case 0xaa:
+        /* Granite Rapids */
+        case 0xad: case 0xae:
+        /* Sierra Forest */
+        case 0xaf:
+        /* Raptor Lake */
+        case 0xba: case 0xb7: case 0xbf:
+        /* Lunar Lake */
+        case 0xbd:
+        /* Emerald Rapids */
+        case 0xcf:
             return sk_lbr;
         /* Atom */
         case 0x1c: case 0x26: case 0x27: case 0x35: case 0x36:
--
2.52.0



--
Teddy Astie | Vates XCP-ng Developer

XCP-ng & Xen Orchestra - Vates solutions

web: https://vates.tech