Hi,
On Fri, Nov 05, 2021 at 09:15:00AM +0800, YueHaibing wrote:
> kvm_vcpu_preferred_target() always return 0 because kvm_target_cpu()
> never returns a negative error code.
>
> Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
> ---
> arch/arm64/include/asm/kvm_host.h | 2 +-
> arch/arm64/kvm/arm.c | 5 +----
> arch/arm64/kvm/guest.c | 7 +------
> 3 files changed, 3 insertions(+), 11 deletions(-)
>
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index 4be8486042a7..2a5f7f38006f 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -584,7 +584,7 @@ struct kvm_vcpu_stat {
> u64 exits;
> };
>
> -int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
> +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 f5490afe1ebf..2f03cbfefe67 100644
> --- a/arch/arm64/kvm/arm.c
> +++ b/arch/arm64/kvm/arm.c
> @@ -1389,12 +1389,9 @@ long kvm_arch_vm_ioctl(struct file *filp,
> return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
> }
> case KVM_ARM_PREFERRED_TARGET: {
> - int err;
> struct kvm_vcpu_init init;
>
> - err = kvm_vcpu_preferred_target(&init);
> - if (err)
> - return err;
> + kvm_vcpu_preferred_target(&init);
>
> 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 5ce26bedf23c..e116c7767730 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -869,13 +869,10 @@ u32 __attribute_const__ kvm_target_cpu(void)
> return KVM_ARM_TARGET_GENERIC_V8;
> }
>
> -int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
> +void kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
> {
> u32 target = kvm_target_cpu();
Checked and kvm_target_cpu() never returns a negative value (the target values
are from 0 to 5, inclusive), which matches the type of the return value from the
function, which is unsigned. The patch look correct to me:
Reviewed-by: Alexandru Elisei <alexandru.elisei@xxxxxxx>
Thanks,
Alex
>
> - if (target < 0)
> - return -ENODEV;
> -
> memset(init, 0, sizeof(*init));
>
> /*
> @@ -885,8 +882,6 @@ int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
> * target type.
> */
> init->target = (__u32)target;
> -
> - return 0;
> }
>
> int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
> --
> 2.17.1
>
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