[RFC PATCH v4 14/39] KVM: arm64: Add SPE capability and VCPU feature
From: Alexandru Elisei <hidden>
Date: 2021-08-25 16:17:53
Also in:
kvmarm, lkml
Subsystem:
arm64 port (aarch64 architecture), documentation, kernel virtual machine (kvm), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Jonathan Corbet, Paolo Bonzini, Marc Zyngier, Oliver Upton, Linus Torvalds
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 <redacted> --- 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
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel