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 <[email protected]> --- 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 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
