[PATCH v7 25/27] KVM: arm64: Add a capability to advertise SVE support

Dave Martin
2019-03-29T13:18:29Z

To provide a uniform way to check for KVM SVE support amongst other
features, this patch adds a suitable capability KVM_CAP_ARM_SVE,
and reports it as present when SVE is available.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Julien Thierry <julien.thierry@arm.com>
Tested-by: zhang.lei <zhang.lei@jp.fujitsu.com>

---

Changes since v5:

* [Julien Thierry] Strip out has_vhe() sanity-check, which wasn't in
the most logical place, and anyway doesn't really belong in this
patch.

Moved to KVM: arm64/sve: Allow userspace to enable SVE for vcpus
instead.
---
arch/arm64/kvm/reset.c | 3 +++
include/uapi/linux/kvm.h | 1 +
2 files changed, 4 insertions(+)

diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index 32c5ac0..f13378d 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -98,6 +98,9 @@ int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_ARM_VM_IPA_SIZE:
r = kvm_ipa_limit;
break;
+ case KVM_CAP_ARM_SVE:
+ r = system_supports_sve();
+ break;
default:
r = 0;
}
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index c3b8e7a..1d56444 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -988,6 +988,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_ARM_VM_IPA_SIZE 165
#define KVM_CAP_MANUAL_DIRTY_LOG_PROTECT 166
#define KVM_CAP_HYPERV_CPUID 167
+#define KVM_CAP_ARM_SVE 168

#ifdef KVM_CAP_IRQ_ROUTING

--
2.1.4