| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * VGIC system registers handling functions for AArch64 mode |
| */ |
| |
| #include <linux/irqchip/arm-gic-v3.h> |
| #include <linux/kvm.h> |
| #include <linux/kvm_host.h> |
| #include <asm/kvm_emulate.h> |
| #include "vgic/vgic.h" |
| #include "sys_regs.h" |
| |
| static bool access_gic_ctlr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, |
| const struct sys_reg_desc *r) |
| { |
| u32 host_pri_bits, host_id_bits, host_seis, host_a3v, seis, a3v; |
| struct vgic_cpu *vgic_v3_cpu = &vcpu->arch.vgic_cpu; |
| struct vgic_vmcr vmcr; |
| u64 val; |
| |
| vgic_get_vmcr(vcpu, &vmcr); |
| if (p->is_write) { |
| val = p->regval; |
| |
| /* |
| * Disallow restoring VM state if not supported by this |
| * hardware. |
| */ |
| host_pri_bits = ((val & ICC_CTLR_EL1_PRI_BITS_MASK) >> |
| ICC_CTLR_EL1_PRI_BITS_SHIFT) + 1; |
| if (host_pri_bits > vgic_v3_cpu->num_pri_bits) |
| return false; |
| |
| vgic_v3_cpu->num_pri_bits = host_pri_bits; |
| |
| host_id_bits = (val & ICC_CTLR_EL1_ID_BITS_MASK) >> |
| ICC_CTLR_EL1_ID_BITS_SHIFT; |
| if (host_id_bits > vgic_v3_cpu->num_id_bits) |
| return false; |
| |
| vgic_v3_cpu->num_id_bits = host_id_bits; |
| |
| host_seis = ((kvm_vgic_global_state.ich_vtr_el2 & |
| ICH_VTR_SEIS_MASK) >> ICH_VTR_SEIS_SHIFT); |
| seis = (val & ICC_CTLR_EL1_SEIS_MASK) >> |
| ICC_CTLR_EL1_SEIS_SHIFT; |
| if (host_seis != seis) |
| return false; |
| |
| host_a3v = ((kvm_vgic_global_state.ich_vtr_el2 & |
| ICH_VTR_A3V_MASK) >> ICH_VTR_A3V_SHIFT); |
| a3v = (val & ICC_CTLR_EL1_A3V_MASK) >> ICC_CTLR_EL1_A3V_SHIFT; |
| if (host_a3v != a3v) |
| return false; |
| |
| /* |
| * Here set VMCR.CTLR in ICC_CTLR_EL1 layout. |
| * The vgic_set_vmcr() will convert to ICH_VMCR layout. |
| */ |
| vmcr.cbpr = (val & ICC_CTLR_EL1_CBPR_MASK) >> ICC_CTLR_EL1_CBPR_SHIFT; |
| vmcr.eoim = (val & ICC_CTLR_EL1_EOImode_MASK) >> ICC_CTLR_EL1_EOImode_SHIFT; |
| vgic_set_vmcr(vcpu, &vmcr); |
| } else { |
| val = 0; |
| val |= (vgic_v3_cpu->num_pri_bits - 1) << |
| ICC_CTLR_EL1_PRI_BITS_SHIFT; |
| val |= vgic_v3_cpu->num_id_bits << ICC_CTLR_EL1_ID_BITS_SHIFT; |
| val |= ((kvm_vgic_global_state.ich_vtr_el2 & |
| ICH_VTR_SEIS_MASK) >> ICH_VTR_SEIS_SHIFT) << |
| ICC_CTLR_EL1_SEIS_SHIFT; |
| val |= ((kvm_vgic_global_state.ich_vtr_el2 & |
| ICH_VTR_A3V_MASK) >> ICH_VTR_A3V_SHIFT) << |
| ICC_CTLR_EL1_A3V_SHIFT; |
| /* |
| * The VMCR.CTLR value is in ICC_CTLR_EL1 layout. |
| * Extract it directly using ICC_CTLR_EL1 reg definitions. |
| */ |
| val |= (vmcr.cbpr << ICC_CTLR_EL1_CBPR_SHIFT) & ICC_CTLR_EL1_CBPR_MASK; |
| val |= (vmcr.eoim << ICC_CTLR_EL1_EOImode_SHIFT) & ICC_CTLR_EL1_EOImode_MASK; |
| |
| p->regval = val; |
| } |
| |
| return true; |
| } |
| |
| static bool access_gic_pmr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, |
| const struct sys_reg_desc *r) |
| { |
| struct vgic_vmcr vmcr; |
| |
| vgic_get_vmcr(vcpu, &vmcr); |
| if (p->is_write) { |
| vmcr.pmr = (p->regval & ICC_PMR_EL1_MASK) >> ICC_PMR_EL1_SHIFT; |
| vgic_set_vmcr(vcpu, &vmcr); |
| } else { |
| p->regval = (vmcr.pmr << ICC_PMR_EL1_SHIFT) & ICC_PMR_EL1_MASK; |
| } |
| |
| return true; |
| } |
| |
| static bool access_gic_bpr0(struct kvm_vcpu *vcpu, struct sys_reg_params *p, |
| const struct sys_reg_desc *r) |
| { |
| struct vgic_vmcr vmcr; |
| |
| vgic_get_vmcr(vcpu, &vmcr); |
| if (p->is_write) { |
| vmcr.bpr = (p->regval & ICC_BPR0_EL1_MASK) >> |
| ICC_BPR0_EL1_SHIFT; |
| vgic_set_vmcr(vcpu, &vmcr); |
| } else { |
| p->regval = (vmcr.bpr << ICC_BPR0_EL1_SHIFT) & |
| ICC_BPR0_EL1_MASK; |
| } |
| |
| return true; |
| } |
| |
| static bool access_gic_bpr1(struct kvm_vcpu *vcpu, struct sys_reg_params *p, |
| const struct sys_reg_desc *r) |
| { |
| struct vgic_vmcr vmcr; |
| |
| if (!p->is_write) |
| p->regval = 0; |
| |
| vgic_get_vmcr(vcpu, &vmcr); |
| if (!vmcr.cbpr) { |
| if (p->is_write) { |
| vmcr.abpr = (p->regval & ICC_BPR1_EL1_MASK) >> |
| ICC_BPR1_EL1_SHIFT; |
| vgic_set_vmcr(vcpu, &vmcr); |
| } else { |
| p->regval = (vmcr.abpr << ICC_BPR1_EL1_SHIFT) & |
| ICC_BPR1_EL1_MASK; |
| } |
| } else { |
| if (!p->is_write) |
| p->regval = min((vmcr.bpr + 1), 7U); |
| } |
| |
| return true; |
| } |
| |
| static bool access_gic_grpen0(struct kvm_vcpu *vcpu, struct sys_reg_params *p, |
| const struct sys_reg_desc *r) |
| { |
| struct vgic_vmcr vmcr; |
| |
| vgic_get_vmcr(vcpu, &vmcr); |
| if (p->is_write) { |
| vmcr.grpen0 = (p->regval & ICC_IGRPEN0_EL1_MASK) >> |
| ICC_IGRPEN0_EL1_SHIFT; |
| vgic_set_vmcr(vcpu, &vmcr); |
| } else { |
| p->regval = (vmcr.grpen0 << ICC_IGRPEN0_EL1_SHIFT) & |
| ICC_IGRPEN0_EL1_MASK; |
| } |
| |
| return true; |
| } |
| |
| static bool access_gic_grpen1(struct kvm_vcpu *vcpu, struct sys_reg_params *p, |
| const struct sys_reg_desc *r) |
| { |
| struct vgic_vmcr vmcr; |
| |
| vgic_get_vmcr(vcpu, &vmcr); |
| if (p->is_write) { |
| vmcr.grpen1 = (p->regval & ICC_IGRPEN1_EL1_MASK) >> |
| ICC_IGRPEN1_EL1_SHIFT; |
| vgic_set_vmcr(vcpu, &vmcr); |
| } else { |
| p->regval = (vmcr.grpen1 << ICC_IGRPEN1_EL1_SHIFT) & |
| ICC_IGRPEN1_EL1_MASK; |
| } |
| |
| return true; |
| } |
| |
| static void vgic_v3_access_apr_reg(struct kvm_vcpu *vcpu, |
| struct sys_reg_params *p, u8 apr, u8 idx) |
| { |
| struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3; |
| uint32_t *ap_reg; |
| |
| if (apr) |
| ap_reg = &vgicv3->vgic_ap1r[idx]; |
| else |
| ap_reg = &vgicv3->vgic_ap0r[idx]; |
| |
| if (p->is_write) |
| *ap_reg = p->regval; |
| else |
| p->regval = *ap_reg; |
| } |
| |
| static bool access_gic_aprn(struct kvm_vcpu *vcpu, struct sys_reg_params *p, |
| const struct sys_reg_desc *r, u8 apr) |
| { |
| u8 idx = r->Op2 & 3; |
| |
| if (idx > vgic_v3_max_apr_idx(vcpu)) |
| goto err; |
| |
| vgic_v3_access_apr_reg(vcpu, p, apr, idx); |
| return true; |
| err: |
| if (!p->is_write) |
| p->regval = 0; |
| |
| return false; |
| } |
| |
| static bool access_gic_ap0r(struct kvm_vcpu *vcpu, struct sys_reg_params *p, |
| const struct sys_reg_desc *r) |
| |
| { |
| return access_gic_aprn(vcpu, p, r, 0); |
| } |
| |
| static bool access_gic_ap1r(struct kvm_vcpu *vcpu, struct sys_reg_params *p, |
| const struct sys_reg_desc *r) |
| { |
| return access_gic_aprn(vcpu, p, r, 1); |
| } |
| |
| static bool access_gic_sre(struct kvm_vcpu *vcpu, struct sys_reg_params *p, |
| const struct sys_reg_desc *r) |
| { |
| struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3; |
| |
| /* Validate SRE bit */ |
| if (p->is_write) { |
| if (!(p->regval & ICC_SRE_EL1_SRE)) |
| return false; |
| } else { |
| p->regval = vgicv3->vgic_sre; |
| } |
| |
| return true; |
| } |
| static const struct sys_reg_desc gic_v3_icc_reg_descs[] = { |
| { SYS_DESC(SYS_ICC_PMR_EL1), access_gic_pmr }, |
| { SYS_DESC(SYS_ICC_BPR0_EL1), access_gic_bpr0 }, |
| { SYS_DESC(SYS_ICC_AP0R0_EL1), access_gic_ap0r }, |
| { SYS_DESC(SYS_ICC_AP0R1_EL1), access_gic_ap0r }, |
| { SYS_DESC(SYS_ICC_AP0R2_EL1), access_gic_ap0r }, |
| { SYS_DESC(SYS_ICC_AP0R3_EL1), access_gic_ap0r }, |
| { SYS_DESC(SYS_ICC_AP1R0_EL1), access_gic_ap1r }, |
| { SYS_DESC(SYS_ICC_AP1R1_EL1), access_gic_ap1r }, |
| { SYS_DESC(SYS_ICC_AP1R2_EL1), access_gic_ap1r }, |
| { SYS_DESC(SYS_ICC_AP1R3_EL1), access_gic_ap1r }, |
| { SYS_DESC(SYS_ICC_BPR1_EL1), access_gic_bpr1 }, |
| { SYS_DESC(SYS_ICC_CTLR_EL1), access_gic_ctlr }, |
| { SYS_DESC(SYS_ICC_SRE_EL1), access_gic_sre }, |
| { SYS_DESC(SYS_ICC_IGRPEN0_EL1), access_gic_grpen0 }, |
| { 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) |
| { |
| struct sys_reg_params params; |
| u64 sysreg = (id & KVM_DEV_ARM_VGIC_SYSREG_MASK) | KVM_REG_SIZE_U64; |
| |
| params.regval = *reg; |
| params.is_write = is_write; |
| |
| if (find_reg_by_id(sysreg, ¶ms, gic_v3_icc_reg_descs, |
| ARRAY_SIZE(gic_v3_icc_reg_descs))) |
| return 0; |
| |
| return -ENXIO; |
| } |
| |
| int vgic_v3_cpu_sysregs_uaccess(struct kvm_vcpu *vcpu, bool is_write, u64 id, |
| u64 *reg) |
| { |
| struct sys_reg_params params; |
| const struct sys_reg_desc *r; |
| u64 sysreg = (id & KVM_DEV_ARM_VGIC_SYSREG_MASK) | KVM_REG_SIZE_U64; |
| |
| if (is_write) |
| params.regval = *reg; |
| params.is_write = is_write; |
| |
| r = find_reg_by_id(sysreg, ¶ms, gic_v3_icc_reg_descs, |
| ARRAY_SIZE(gic_v3_icc_reg_descs)); |
| if (!r) |
| return -ENXIO; |
| |
| if (!r->access(vcpu, ¶ms, r)) |
| return -EINVAL; |
| |
| if (!is_write) |
| *reg = params.regval; |
| |
| return 0; |
| } |
