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.
Reviewed-by: Eric Auger <[email protected]> Signed-off-by: Marc Zyngier <[email protected]> --- arch/arm64/include/asm/sysreg.h | 1 + virt/kvm/arm/hyp/vgic-v3-sr.c | 36 ++++++++++++++++++++++++++++++++++++ 2 files changed, 37 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 42ac9ee7650a..54a8e828c85b 100644 --- a/virt/kvm/arm/hyp/vgic-v3-sr.c +++ b/virt/kvm/arm/hyp/vgic-v3-sr.c @@ -688,11 +688,41 @@ 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 = 7 - vtr_to_nr_pre_bits(read_gicreg(ICH_VTR_EL2)); + + /* 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; + + if (vmcr & ICH_VMCR_CBPR_MASK) { + val = __vgic_v3_get_bpr1(vmcr); + val <<= ICH_VMCR_BPR1_SHIFT; + val &= ICH_VMCR_BPR1_MASK; + vmcr &= ~ICH_VMCR_BPR1_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); @@ -870,6 +900,12 @@ 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 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
