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| author | Dave Martin <Dave.Martin@arm.com> | 2018-12-19 15:27:01 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2019-03-29 15:41:54 +0100 |
| commit | 7dd32a0d0103a5941efbb971f85a3e930cc5665e (patch) | |
| tree | 55f342707eaa1a5ea0fa838091c79dff01d9df2b /include | |
| parent | KVM: arm/arm64: Add hook for arch-specific KVM initialisation (diff) | |
| download | linux-7dd32a0d0103a5941efbb971f85a3e930cc5665e.tar.xz linux-7dd32a0d0103a5941efbb971f85a3e930cc5665e.zip | |
KVM: arm/arm64: Add KVM_ARM_VCPU_FINALIZE ioctl
Some aspects of vcpu configuration may be too complex to be
completed inside KVM_ARM_VCPU_INIT. Thus, there may be a
requirement for userspace to do some additional configuration
before various other ioctls will work in a consistent way.
In particular this will be the case for SVE, where userspace will
need to negotiate the set of vector lengths to be made available to
the guest before the vcpu becomes fully usable.
In order to provide an explicit way for userspace to confirm that
it has finished setting up a particular vcpu feature, this patch
adds a new ioctl KVM_ARM_VCPU_FINALIZE.
When userspace has opted into a feature that requires finalization,
typically by means of a feature flag passed to KVM_ARM_VCPU_INIT, a
matching call to KVM_ARM_VCPU_FINALIZE is now required before
KVM_RUN or KVM_GET_REG_LIST is allowed. Individual features may
impose additional restrictions where appropriate.
No existing vcpu features are affected by this, so current
userspace implementations will continue to work exactly as before,
with no need to issue KVM_ARM_VCPU_FINALIZE.
As implemented in this patch, KVM_ARM_VCPU_FINALIZE is currently a
placeholder: no finalizable features exist yet, so ioctl is not
required and will always yield EINVAL. Subsequent patches will add
the finalization logic to make use of this ioctl for SVE.
No functional change for existing userspace.
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>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/kvm.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index dc77a5a3648d..c3b8e7a31315 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1441,6 +1441,9 @@ struct kvm_enc_region { /* Available with KVM_CAP_HYPERV_CPUID */ #define KVM_GET_SUPPORTED_HV_CPUID _IOWR(KVMIO, 0xc1, struct kvm_cpuid2) +/* Available with KVM_CAP_ARM_SVE */ +#define KVM_ARM_VCPU_FINALIZE _IOW(KVMIO, 0xc2, int) + /* Secure Encrypted Virtualization command */ enum sev_cmd_id { /* Guest initialization commands */ |