On Fri, Jun 09, 2017 at 12:49:42PM +0100, Marc Zyngier wrote:
> Add a handler for reading/writing the guest's view of the ICC_BPR0_EL1
> register, which is located in the ICH_VMCR_EL2.BPR0 field.
>
> Tested-by: Alexander Graf <agraf@xxxxxxx>
> Acked-by: David Daney <david.daney@xxxxxxxxxx>
> Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx>
> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Reviewed-by: Christoffer Dall <cdall@xxxxxxxxxx>
> ---
> arch/arm64/include/asm/sysreg.h | 1 +
> virt/kvm/arm/hyp/vgic-v3-sr.c | 28 ++++++++++++++++++++++++++++
> 2 files changed, 29 insertions(+)
>
> diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
> index bd000686194a..d20be0b28ca4 100644
> --- a/arch/arm64/include/asm/sysreg.h
> +++ b/arch/arm64/include/asm/sysreg.h
> @@ -180,6 +180,7 @@
>
> #define SYS_VBAR_EL1 sys_reg(3, 0, 12, 0, 0)
>
> +#define SYS_ICC_BPR0_EL1 sys_reg(3, 0, 12, 8, 3)
> #define SYS_ICC_AP1Rn_EL1(n) sys_reg(3, 0, 12, 9, n)
> #define SYS_ICC_DIR_EL1 sys_reg(3, 0, 12, 11, 1)
> #define SYS_ICC_SGI1R_EL1 sys_reg(3, 0, 12, 11, 5)
> diff --git a/virt/kvm/arm/hyp/vgic-v3-sr.c b/virt/kvm/arm/hyp/vgic-v3-sr.c
> index a2a62f030341..f53908cc981c 100644
> --- a/virt/kvm/arm/hyp/vgic-v3-sr.c
> +++ b/virt/kvm/arm/hyp/vgic-v3-sr.c
> @@ -706,11 +706,33 @@ static void __hyp_text __vgic_v3_write_igrpen1(struct kvm_vcpu *vcpu, u32 vmcr,
> __vgic_v3_write_vmcr(vmcr);
> }
>
> +static void __hyp_text __vgic_v3_read_bpr0(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
> +{
> + vcpu_set_reg(vcpu, rt, __vgic_v3_get_bpr0(vmcr));
> +}
> +
> static void __hyp_text __vgic_v3_read_bpr1(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
> {
> vcpu_set_reg(vcpu, rt, __vgic_v3_get_bpr1(vmcr));
> }
>
> +static void __hyp_text __vgic_v3_write_bpr0(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
> +{
> + u64 val = vcpu_get_reg(vcpu, rt);
> + u8 bpr_min = __vgic_v3_bpr_min() - 1;
> +
> + /* Enforce BPR limiting */
> + if (val < bpr_min)
> + val = bpr_min;
> +
> + val <<= ICH_VMCR_BPR0_SHIFT;
> + val &= ICH_VMCR_BPR0_MASK;
> + vmcr &= ~ICH_VMCR_BPR0_MASK;
> + vmcr |= val;
> +
> + __vgic_v3_write_vmcr(vmcr);
> +}
> +
> static void __hyp_text __vgic_v3_write_bpr1(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
> {
> u64 val = vcpu_get_reg(vcpu, rt);
> @@ -888,6 +910,12 @@ int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu)
> case SYS_ICC_HPPIR1_EL1:
> fn = __vgic_v3_read_hppir;
> break;
> + case SYS_ICC_BPR0_EL1:
> + if (is_read)
> + fn = __vgic_v3_read_bpr0;
> + else
> + fn = __vgic_v3_write_bpr0;
> + break;
> default:
> return 0;
> }
> --
> 2.11.0
>
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