On Wed, Jul 06, 2022 at 05:42:52PM +0100, Marc Zyngier wrote:
> Finding out whether a sysreg exists has little to do with that
> register being accessed, so drop the is_write parameter.
>
> Also, the reg pointer is completely unused, and we're better off
> just passing the attr pointer to the function.
>
> This result in a small cleanup of the calling site, with a new
> helper converting the vGIC view of a sysreg into the canonical
> one (this is purely cosmetic, as the encoding is the same).
>
> Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Reviewed-by: Oliver Upton <oliver.upton@xxxxxxxxx>
> ---
> arch/arm64/kvm/vgic-sys-reg-v3.c | 14 ++++++++++----
> arch/arm64/kvm/vgic/vgic-mmio-v3.c | 8 ++------
> arch/arm64/kvm/vgic/vgic.h | 3 +--
> 3 files changed, 13 insertions(+), 12 deletions(-)
>
> diff --git a/arch/arm64/kvm/vgic-sys-reg-v3.c b/arch/arm64/kvm/vgic-sys-reg-v3.c
> index 644acda33c7c..85a5e1d15e9f 100644
> --- a/arch/arm64/kvm/vgic-sys-reg-v3.c
> +++ b/arch/arm64/kvm/vgic-sys-reg-v3.c
> @@ -260,12 +260,18 @@ static const struct sys_reg_desc gic_v3_icc_reg_descs[] = {
> { SYS_DESC(SYS_ICC_IGRPEN1_EL1), access_gic_grpen1 },
> };
>
> -int vgic_v3_has_cpu_sysregs_attr(struct kvm_vcpu *vcpu, bool is_write, u64 id,
> - u64 *reg)
> +static u64 attr_to_id(u64 attr)
> {
> - u64 sysreg = (id & KVM_DEV_ARM_VGIC_SYSREG_MASK) | KVM_REG_SIZE_U64;
> + return ARM64_SYS_REG(FIELD_GET(KVM_REG_ARM_VGIC_SYSREG_OP0_MASK, attr),
> + FIELD_GET(KVM_REG_ARM_VGIC_SYSREG_OP1_MASK, attr),
> + FIELD_GET(KVM_REG_ARM_VGIC_SYSREG_CRN_MASK, attr),
> + FIELD_GET(KVM_REG_ARM_VGIC_SYSREG_CRM_MASK, attr),
> + FIELD_GET(KVM_REG_ARM_VGIC_SYSREG_OP2_MASK, attr));
> +}
>
> - if (get_reg_by_id(sysreg, gic_v3_icc_reg_descs,
> +int vgic_v3_has_cpu_sysregs_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
> +{
> + if (get_reg_by_id(attr_to_id(attr->attr), gic_v3_icc_reg_descs,
> ARRAY_SIZE(gic_v3_icc_reg_descs)))
> return 0;
>
> diff --git a/arch/arm64/kvm/vgic/vgic-mmio-v3.c b/arch/arm64/kvm/vgic/vgic-mmio-v3.c
> index f15e29cc63ce..a2ff73899976 100644
> --- a/arch/arm64/kvm/vgic/vgic-mmio-v3.c
> +++ b/arch/arm64/kvm/vgic/vgic-mmio-v3.c
> @@ -986,12 +986,8 @@ int vgic_v3_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr)
> iodev.base_addr = 0;
> break;
> }
> - case KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS: {
> - u64 reg, id;
> -
> - id = (attr->attr & KVM_DEV_ARM_VGIC_SYSREG_INSTR_MASK);
> - return vgic_v3_has_cpu_sysregs_attr(vcpu, 0, id, ®);
> - }
> + case KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS:
> + return vgic_v3_has_cpu_sysregs_attr(vcpu, attr);
> default:
> return -ENXIO;
> }
> diff --git a/arch/arm64/kvm/vgic/vgic.h b/arch/arm64/kvm/vgic/vgic.h
> index 4c6bdd321faa..ffc2d3c81b28 100644
> --- a/arch/arm64/kvm/vgic/vgic.h
> +++ b/arch/arm64/kvm/vgic/vgic.h
> @@ -247,8 +247,7 @@ int vgic_v3_redist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
> int offset, u32 *val);
> int vgic_v3_cpu_sysregs_uaccess(struct kvm_vcpu *vcpu, bool is_write,
> u64 id, u64 *val);
> -int vgic_v3_has_cpu_sysregs_attr(struct kvm_vcpu *vcpu, bool is_write, u64 id,
> - u64 *reg);
> +int vgic_v3_has_cpu_sysregs_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
> int vgic_v3_line_level_info_uaccess(struct kvm_vcpu *vcpu, bool is_write,
> u32 intid, u64 *val);
> int kvm_register_vgic_device(unsigned long type);
> --
> 2.34.1
>
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