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[PATCH v1 03/28] x86/hvm: report SVM x2AVIC support
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: dmukhin@xxxxxxxx
- Date: Wed, 4 Nov 2026 17:33:20 -0800
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- Cc: andrew.cooper3@xxxxxxxxxx, jason.andryuk@xxxxxxx, jbeulich@xxxxxxxx, roger@xxxxxxxxxxxxxx, teddy.astie@xxxxxxxxxx, dmukhin@xxxxxxx, Denis Mukhin <dmukhin@xxxxxxxx>
- Delivery-date: Thu, 05 Nov 2026 01:34:32 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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From: Denis Mukhin <dmukhin@xxxxxxxx>
Report SVM AVIC support from CPUID Fn8000000A_EDX[X2AVIC](bit 18).
Signed-off-by: Denis Mukhin <dmukhin@xxxxxxxx>
---
xen/arch/x86/hvm/svm/svm.c | 1 +
xen/arch/x86/include/asm/hvm/svm.h | 2 ++
2 files changed, 3 insertions(+)
diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c
index cf008a8acdf2..db81dad4b681 100644
--- a/xen/arch/x86/hvm/svm/svm.c
+++ b/xen/arch/x86/hvm/svm/svm.c
@@ -2457,6 +2457,7 @@ static void __init print_svm_features(void)
P(cpu_has_svm_vnmi, "Virtual NMI");
P(cpu_has_svm_bus_lock, "Bus Lock Filter");
P(cpu_has_svm_avic, "Advanced Virtual Interrupt Controller");
+ P(cpu_has_svm_x2avic, "x2 Advanced Virtual Interrupt Controller");
#undef P
if ( !printed )
diff --git a/xen/arch/x86/include/asm/hvm/svm.h
b/xen/arch/x86/include/asm/hvm/svm.h
index 0fc33f41b09d..292a9ee19b11 100644
--- a/xen/arch/x86/include/asm/hvm/svm.h
+++ b/xen/arch/x86/include/asm/hvm/svm.h
@@ -36,6 +36,7 @@ extern u32 svm_feature_flags;
#define SVM_FEATURE_AVIC 13 /* Advanced Virtual Interrupt Controller
*/
#define SVM_FEATURE_VLOADSAVE 15 /* virtual vmload/vmsave */
#define SVM_FEATURE_VGIF 16 /* Virtual GIF */
+#define SVM_FEATURE_X2AVIC 18 /* x2 Advanced Virtual Interrupt
Controller */
#define SVM_FEATURE_SSS 19 /* NPT Supervisor Shadow Stacks */
#define SVM_FEATURE_SPEC_CTRL 20 /* MSR_SPEC_CTRL virtualisation */
#define SVM_FEATURE_VNMI 25 /* Virtual NMI */
@@ -57,6 +58,7 @@ static inline bool cpu_has_svm_feature(unsigned int feat)
#define cpu_has_pause_thresh cpu_has_svm_feature(SVM_FEATURE_PAUSETHRESH)
#define cpu_has_tsc_ratio cpu_has_svm_feature(SVM_FEATURE_TSCRATEMSR)
#define cpu_has_svm_avic cpu_has_svm_feature(SVM_FEATURE_AVIC)
+#define cpu_has_svm_x2avic cpu_has_svm_feature(SVM_FEATURE_X2AVIC)
#define cpu_has_svm_vloadsave cpu_has_svm_feature(SVM_FEATURE_VLOADSAVE)
#define cpu_has_svm_sss cpu_has_svm_feature(SVM_FEATURE_SSS)
#define cpu_has_svm_spec_ctrl cpu_has_svm_feature(SVM_FEATURE_SPEC_CTRL)
--
2.55.0
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