Add the KVM_CAP_ARM_SPE capability which allows userspace to discover if
SPE emulation is available. Add the KVM_ARM_VCPU_SPE feature which
enables the emulation for a VCPU.
Both are disabled for now.
Signed-off-by: Alexandru Elisei <alexandru.elisei@xxxxxxx>
---
Documentation/virt/kvm/api.rst | 9 +++++++++
arch/arm64/include/uapi/asm/kvm.h | 1 +
arch/arm64/kvm/arm.c | 3 +++
include/uapi/linux/kvm.h | 1 +
4 files changed, 14 insertions(+)
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 994faa24690a..68fada258b80 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -7315,3 +7315,12 @@ The argument to KVM_ENABLE_CAP is also a bitmask, and must be a subset
of the result of KVM_CHECK_EXTENSION. KVM will forward to userspace
the hypercalls whose corresponding bit is in the argument, and return
ENOSYS for the others.
+
+8.35 KVM_CAP_ARM_SPE
+--------------------
+
+:Architectures: arm64
+
+This capability indicates that Statistical Profiling Extension (SPE) emulation
+is available in KVM. SPE emulation is enabled for each VCPU which has the
+feature bit KVM_ARM_VCPU_SPE set.
diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
index b3edde68bc3e..9f0a8ea50ea9 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h
@@ -106,6 +106,7 @@ struct kvm_regs {
#define KVM_ARM_VCPU_SVE 4 /* enable SVE for this CPU */
#define KVM_ARM_VCPU_PTRAUTH_ADDRESS 5 /* VCPU uses address authentication */
#define KVM_ARM_VCPU_PTRAUTH_GENERIC 6 /* VCPU uses generic authentication */
+#define KVM_ARM_VCPU_SPE 7 /* enable SPE for this CPU */
struct kvm_vcpu_init {
__u32 target;
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index e8a7c0c3a086..22544eb367f3 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -304,6 +304,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_ARM_VCPU_SUPPORTED_CPUS:
r = 1;
break;
+ case KVM_CAP_ARM_SPE:
+ r = 0;
+ break;
default:
r = 0;
}
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index e5acc925c528..930ef91f7916 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1114,6 +1114,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_ARM_MTE 205
#define KVM_CAP_ARM_LOCK_USER_MEMORY_REGION 206
#define KVM_CAP_ARM_VCPU_SUPPORTED_CPUS 207
+#define KVM_CAP_ARM_SPE 208
#ifdef KVM_CAP_IRQ_ROUTING
--
2.33.0
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