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| author |   Dave Martin <Dave.Martin@arm.com> | 2019-02-28 18:46:44 +0000 |
|---|---|---|
| committer |   Marc Zyngier <marc.zyngier@arm.com> | 2019-03-29 14:41:54 +0000 |
| commit | 9033bba4b53527b57bec217509a967a25cb19357 (patch) | |
| tree | 0bc71869065db0ddf197cf2a05d0a5aff4fe9759 /arch/arm64/include/uapi | |
| parent | KVM: arm/arm64: Add KVM_ARM_VCPU_FINALIZE ioctl (diff) | |
| download | linux-dev-9033bba4b53527b57bec217509a967a25cb19357.tar.xz linux-dev-9033bba4b53527b57bec217509a967a25cb19357.zip | |
KVM: arm64/sve: Add pseudo-register for the guest's vector lengths
This patch adds a new pseudo-register KVM_REG_ARM64_SVE_VLS to
allow userspace to set and query the set of vector lengths visible
to the guest.
In the future, multiple register slices per SVE register may be
visible through the ioctl interface. Once the set of slices has
been determined we would not be able to allow the vector length set
to be changed any more, in order to avoid userspace seeing
inconsistent sets of registers. For this reason, this patch adds
support for explicit finalization of the SVE configuration via the
KVM_ARM_VCPU_FINALIZE ioctl.
Finalization is the proper place to allocate the SVE register state
storage in vcpu->arch.sve_state, so this patch adds that as
appropriate. The data is freed via kvm_arch_vcpu_uninit(), which
was previously a no-op on arm64.
To simplify the logic for determining what vector lengths can be
supported, some code is added to KVM init to work this out, in the
kvm_arm_init_arch_resources() hook.
The KVM_REG_ARM64_SVE_VLS pseudo-register is not exposed yet.
Subsequent patches will allow SVE to be turned on for guest vcpus,
making it visible.
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 'arch/arm64/include/uapi')
| -rw-r--r-- | arch/arm64/include/uapi/asm/kvm.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index ced760cc8478..6963b7e8062b 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -102,6 +102,7 @@ struct kvm_regs { #define KVM_ARM_VCPU_EL1_32BIT 1 /* CPU running a 32bit VM */ #define KVM_ARM_VCPU_PSCI_0_2 2 /* CPU uses PSCI v0.2 */ #define KVM_ARM_VCPU_PMU_V3 3 /* Support guest PMUv3 */ +#define KVM_ARM_VCPU_SVE 4 /* enable SVE for this CPU */ struct kvm_vcpu_init { __u32 target; @@ -243,6 +244,10 @@ struct kvm_vcpu_events { ((n) << 5) | (i)) #define KVM_REG_ARM64_SVE_FFR(i) KVM_REG_ARM64_SVE_PREG(16, i) +/* Vector lengths pseudo-register: */ +#define KVM_REG_ARM64_SVE_VLS (KVM_REG_ARM64 | KVM_REG_ARM64_SVE | \ + KVM_REG_SIZE_U512 | 0xffff) + /* Device Control API: ARM VGIC */ #define KVM_DEV_ARM_VGIC_GRP_ADDR 0 #define KVM_DEV_ARM_VGIC_GRP_DIST_REGS 1 |