On Mon, Jun 10, 2019 at 03:20:30PM +0530, Viresh Kumar wrote:
> On 10-06-19, 10:09, Dave Martin wrote:
> > You could drop the extra level of indirection on vqs now. The only
> > thing it achieves is to enforce the size of the array via type-
> > checkout, but the macro can't easily do that (unless you can think
> > of another way to do it).
> >
> > Otherwise, looks good.
>
> Below is what I wrote initially this morning and then moved to the
> current version as I wasn't sure if you would want that :)
>
> --
> viresh
>
> -------------------------8<-------------------------
>
> From be823e68faffc82a6f621c16ce1bd45990d92791 Mon Sep 17 00:00:00 2001
> Message-Id: <be823e68faffc82a6f621c16ce1bd45990d92791.1560160165.git.viresh.kumar@xxxxxxxxxx>
> From: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
> Date: Mon, 10 Jun 2019 11:15:17 +0530
> Subject: [PATCH] KVM: arm64: Implement vq_present() as a macro
>
> This routine is a one-liner and doesn't really need to be function and
> can be implemented as a macro.
>
> Suggested-by: Dave Martin <Dave.Martin@xxxxxxx>
> Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
> ---
> arch/arm64/kvm/guest.c | 12 +++---------
> 1 file changed, 3 insertions(+), 9 deletions(-)
>
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index 3ae2f82fca46..ae734fcfd4ea 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -207,13 +207,7 @@ static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
>
> #define vq_word(vq) (((vq) - SVE_VQ_MIN) / 64)
> #define vq_mask(vq) ((u64)1 << ((vq) - SVE_VQ_MIN) % 64)
> -
> -static bool vq_present(
> - const u64 (*const vqs)[KVM_ARM64_SVE_VLS_WORDS],
> - unsigned int vq)
> -{
> - return (*vqs)[vq_word(vq)] & vq_mask(vq);
> -}
> +#define vq_present(vqs, vq) ((vqs)[vq_word(vq)] & vq_mask(vq))
>
> static int get_sve_vls(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
> {
> @@ -258,7 +252,7 @@ static int set_sve_vls(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
>
> max_vq = 0;
> for (vq = SVE_VQ_MIN; vq <= SVE_VQ_MAX; ++vq)
> - if (vq_present(&vqs, vq))
> + if (vq_present(vqs, vq))
> max_vq = vq;
>
> if (max_vq > sve_vq_from_vl(kvm_sve_max_vl))
> @@ -272,7 +266,7 @@ static int set_sve_vls(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
> * maximum:
> */
> for (vq = SVE_VQ_MIN; vq <= max_vq; ++vq)
> - if (vq_present(&vqs, vq) != sve_vq_available(vq))
> + if (vq_present(vqs, vq) != sve_vq_available(vq))
> return -EINVAL;
I think I prefer this version:
Reviewed-by: Dave Martin <Dave.Martin@xxxxxxx>
Cheers
---Dave
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