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[PATCH 29/30] x86: permit guests to use APX
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 11 Nov 2026 15:32:46 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, "community.manager@xxxxxxxxxxxxxx" <community.manager@xxxxxxxxxxxxxx>
- Delivery-date: Wed, 11 Nov 2026 14:32:53 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
The feature is marked experimental (for only parts of the code actually
having got tested yet, while other parts require respective hardware)
and opt-in for guests.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@ The format is based on [Keep a Changelog
- On x86:
- Support for AVX10.2. (Experimental)
- Support for AVX10-V2-AUX. (Experimental)
+ - Support for APX. (Experimental)
### Removed
- On Arm:
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -87,6 +87,10 @@ For the Cortex A77 r0p0 - r1p0, see Erra
Status: Tech Preview
+### x86 APX
+
+ Status: Experimental
+
### IOMMU
Status, AMD IOMMU: Supported
--- a/xen/include/public/arch-x86/cpufeatureset.h
+++ b/xen/include/public/arch-x86/cpufeatureset.h
@@ -367,7 +367,7 @@ XEN_CPUFEATURE(USER_MSR, 15*32
XEN_CPUFEATURE(UIRET_UIF, 15*32+17) /* UIRET updates UIF */
XEN_CPUFEATURE(CET_SSS, 15*32+18) /* CET Supervisor Shadow Stacks
safe to use */
XEN_CPUFEATURE(AVX10, 15*32+19) /*a AVX10 Converged Vector ISA */
-XEN_CPUFEATURE(APX_F, 15*32+21) /* APX Foundation Instructions
*/
+XEN_CPUFEATURE(APX_F, 15*32+21) /*a APX Foundation Instructions
*/
XEN_CPUFEATURE(SLSM, 15*32+24) /* Static Lockstep Mode */
/* Intel-defined CPU features, MSR_ARCH_CAPS 0x10a.eax, word 16 */
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