diff options
| author | Oliver Upton <oliver.upton@linux.dev> | 2023-07-10 19:31:40 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2023-07-11 09:40:52 +0100 |
| commit | 5346f7e13e5eb134920a14504b6900c6168dd16e (patch) | |
| tree | 71419df0184bdf1df2837859b7817b55e100f99a | |
| parent | ef98406036769107d5c49a519b31c940910b98d3 (diff) | |
KVM: arm64: Always return generic v8 as the preferred target
Userspace selecting an implementation-specific vCPU target has been
completely useless for a very long time. Let's go whole hog and start
returning the generic v8 target across all implementations as the
preferred target.
Uphold the pre-existing behavior by tolerating either the generic target
or an implementation-specific target if the vCPU happens to be running
on one of the lucky few parts.
Acked-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230710193140.1706399-5-oliver.upton@linux.dev
| -rw-r--r-- | arch/arm64/include/asm/kvm_host.h | 1 | ||||
| -rw-r--r-- | arch/arm64/kvm/arm.c | 9 | ||||
| -rw-r--r-- | arch/arm64/kvm/guest.c | 15 |
3 files changed, 5 insertions, 20 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index b53105bccff9..ed60277e834a 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -898,7 +898,6 @@ struct kvm_vcpu_stat { u64 exits; }; -void kvm_vcpu_preferred_target(struct kvm_vcpu_init *init); unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu); int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices); int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg); diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 13f1bde0bc2d..9ab17ecd76bb 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -1250,7 +1250,8 @@ static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu, { int ret; - if (init->target != kvm_target_cpu()) + if (init->target != KVM_ARM_TARGET_GENERIC_V8 && + init->target != kvm_target_cpu()) return -EINVAL; ret = kvm_vcpu_init_check_features(vcpu, init); @@ -1585,9 +1586,9 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr); } case KVM_ARM_PREFERRED_TARGET: { - struct kvm_vcpu_init init; - - kvm_vcpu_preferred_target(&init); + struct kvm_vcpu_init init = { + .target = KVM_ARM_TARGET_GENERIC_V8, + }; if (copy_to_user(argp, &init, sizeof(init))) return -EFAULT; diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index 20280a5233f6..95f6945c4432 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -884,21 +884,6 @@ u32 __attribute_const__ kvm_target_cpu(void) return KVM_ARM_TARGET_GENERIC_V8; } -void kvm_vcpu_preferred_target(struct kvm_vcpu_init *init) -{ - u32 target = kvm_target_cpu(); - - memset(init, 0, sizeof(*init)); - - /* - * For now, we don't return any features. - * In future, we might use features to return target - * specific features available for the preferred - * target type. - */ - init->target = (__u32)target; -} - int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) { return -EINVAL; |