Commit 468b9c95 authored by Dave Martin's avatar Dave Martin
Browse files

arm64: Add SVE support



This patch enables the Scalable Vector Extension for the guest when
the host supports it.

This requires use of the new KVM_ARM_VCPU_FINALIZE ioctl before the
vcpu is runnable, so a new hook kvm_cpu__configure_features() is
added to provide an appropriate place to do this work.
Signed-off-by: default avatarDave Martin <Dave.Martin@arm.com>
parent 7f4335fd
......@@ -15,5 +15,9 @@
static inline void kvm_cpu__select_features(struct kvm *kvm,
struct kvm_vcpu_init *init) { }
static inline int kvm_cpu__configure_features(struct kvm_cpu *vcpu)
{
return 0;
}
#endif /* KVM__KVM_CPU_ARCH_H */
......@@ -18,5 +18,6 @@
#define ARM_CPU_CTRL_SCTLR_EL1 0
void kvm_cpu__select_features(struct kvm *kvm, struct kvm_vcpu_init *init);
int kvm_cpu__configure_features(struct kvm_cpu *vcpu);
#endif /* KVM__KVM_CPU_ARCH_H */
......@@ -136,6 +136,24 @@ void kvm_cpu__select_features(struct kvm *kvm, struct kvm_vcpu_init *init)
init->features[0] |= 1UL << KVM_ARM_VCPU_PTRAUTH_ADDRESS;
init->features[0] |= 1UL << KVM_ARM_VCPU_PTRAUTH_GENERIC;
}
/* Enable SVE if available */
if (kvm__supports_extension(kvm, KVM_CAP_ARM_SVE))
init->features[0] |= 1UL << KVM_ARM_VCPU_SVE;
}
int kvm_cpu__configure_features(struct kvm_cpu *vcpu)
{
if (kvm__supports_extension(vcpu->kvm, KVM_CAP_ARM_SVE)) {
int feature = KVM_ARM_VCPU_SVE;
if (ioctl(vcpu->vcpu_fd, KVM_ARM_VCPU_FINALIZE, &feature)) {
pr_err("KVM_ARM_VCPU_FINALIZE: %s", strerror(errno));
return -1;
}
}
return 0;
}
void kvm_cpu__reset_vcpu(struct kvm_cpu *vcpu)
......
......@@ -124,6 +124,9 @@ struct kvm_cpu *kvm_cpu__arch_init(struct kvm *kvm, unsigned long cpu_id)
vcpu->cpu_compatible = target->compatible;
vcpu->is_running = true;
if (kvm_cpu__configure_features(vcpu))
die("Unable to configure requested vcpu features");
return vcpu;
}
......
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