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// 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 int set_gic_ctlr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 val)
{
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;
vgic_get_vmcr(vcpu, &vmcr);
/*
* Disallow restoring VM state if not supported by this
* hardware.
*/
host_pri_bits = FIELD_GET(ICC_CTLR_EL1_PRI_BITS_MASK, val) + 1;
if (host_pri_bits > vgic_v3_cpu->num_pri_bits)
return -EINVAL;
vgic_v3_cpu->num_pri_bits = host_pri_bits;
host_id_bits = FIELD_GET(ICC_CTLR_EL1_ID_BITS_MASK, val);
if (host_id_bits > vgic_v3_cpu->num_id_bits)
return -EINVAL;
vgic_v3_cpu->num_id_bits = host_id_bits;
host_seis = FIELD_GET(ICH_VTR_SEIS_MASK, kvm_vgic_global_state.ich_vtr_el2);
seis = FIELD_GET(ICC_CTLR_EL1_SEIS_MASK, val);
if (host_seis != seis)
return -EINVAL;
host_a3v = FIELD_GET(ICH_VTR_A3V_MASK, kvm_vgic_global_state.ich_vtr_el2);
a3v = FIELD_GET(ICC_CTLR_EL1_A3V_MASK, val);
if (host_a3v != a3v)
return -EINVAL;
/*
* Here set VMCR.CTLR in ICC_CTLR_EL1 layout.
* The vgic_set_vmcr() will convert to ICH_VMCR layout.
*/
vmcr.cbpr = FIELD_GET(ICC_CTLR_EL1_CBPR_MASK, val);
vmcr.eoim = FIELD_GET(ICC_CTLR_EL1_EOImode_MASK, val);
vgic_set_vmcr(vcpu, &vmcr);
return 0;
}
static int get_gic_ctlr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 *valp)
{
struct vgic_cpu *vgic_v3_cpu = &vcpu->arch.vgic_cpu;
struct vgic_vmcr vmcr;
u64 val;
vgic_get_vmcr(vcpu, &vmcr);
val = 0;
val |= FIELD_PREP(ICC_CTLR_EL1_PRI_BITS_MASK, vgic_v3_cpu->num_pri_bits - 1);
val |= FIELD_PREP(ICC_CTLR_EL1_ID_BITS_MASK, vgic_v3_cpu->num_id_bits);
val |= FIELD_PREP(ICC_CTLR_EL1_SEIS_MASK,
FIELD_GET(ICH_VTR_SEIS_MASK,
kvm_vgic_global_state.ich_vtr_el2));
val |= FIELD_PREP(ICC_CTLR_EL1_A3V_MASK,
FIELD_GET(ICH_VTR_A3V_MASK, kvm_vgic_global_state.ich_vtr_el2));
/*
* The VMCR.CTLR value is in ICC_CTLR_EL1 layout.
* Extract it directly using ICC_CTLR_EL1 reg definitions.
*/
val |= FIELD_PREP(ICC_CTLR_EL1_CBPR_MASK, vmcr.cbpr);
val |= FIELD_PREP(ICC_CTLR_EL1_EOImode_MASK, vmcr.eoim);
*valp = val;
return 0;
}
static int set_gic_pmr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 val)
{
struct vgic_vmcr vmcr;
vgic_get_vmcr(vcpu, &vmcr);
vmcr.pmr = FIELD_GET(ICC_PMR_EL1_MASK, val);
vgic_set_vmcr(vcpu, &vmcr);
return 0;
}
static int get_gic_pmr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 *val)
{
struct vgic_vmcr vmcr;
vgic_get_vmcr(vcpu, &vmcr);
*val = FIELD_PREP(ICC_PMR_EL1_MASK, vmcr.pmr);
return 0;
}
static int set_gic_bpr0(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 val)
{
struct vgic_vmcr vmcr;
vgic_get_vmcr(vcpu, &vmcr);
vmcr.bpr = FIELD_GET(ICC_BPR0_EL1_MASK, val);
vgic_set_vmcr(vcpu, &vmcr);
return 0;
}
static int get_gic_bpr0(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 *val)
{
struct vgic_vmcr vmcr;
vgic_get_vmcr(vcpu, &vmcr);
*val = FIELD_PREP(ICC_BPR0_EL1_MASK, vmcr.bpr);
return 0;
}
static int set_gic_bpr1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 val)
{
struct vgic_vmcr vmcr;
vgic_get_vmcr(vcpu, &vmcr);
if (!vmcr.cbpr) {
vmcr.abpr = FIELD_GET(ICC_BPR1_EL1_MASK, val);
vgic_set_vmcr(vcpu, &vmcr);
}
return 0;
}
static int get_gic_bpr1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 *val)
{
struct vgic_vmcr vmcr;
vgic_get_vmcr(vcpu, &vmcr);
if (!vmcr.cbpr)
*val = FIELD_PREP(ICC_BPR1_EL1_MASK, vmcr.abpr);
else
*val = min((vmcr.bpr + 1), 7U);
return 0;
}
static int set_gic_grpen0(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 val)
{
struct vgic_vmcr vmcr;
vgic_get_vmcr(vcpu, &vmcr);
vmcr.grpen0 = FIELD_GET(ICC_IGRPEN0_EL1_MASK, val);
vgic_set_vmcr(vcpu, &vmcr);
return 0;
}
static int get_gic_grpen0(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 *val)
{
struct vgic_vmcr vmcr;
vgic_get_vmcr(vcpu, &vmcr);
*val = FIELD_PREP(ICC_IGRPEN0_EL1_MASK, vmcr.grpen0);
return 0;
}
static int set_gic_grpen1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 val)
{
struct vgic_vmcr vmcr;
vgic_get_vmcr(vcpu, &vmcr);
vmcr.grpen1 = FIELD_GET(ICC_IGRPEN1_EL1_MASK, val);
vgic_set_vmcr(vcpu, &vmcr);
return 0;
}
static int get_gic_grpen1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 *val)
{
struct vgic_vmcr vmcr;
vgic_get_vmcr(vcpu, &vmcr);
*val = FIELD_GET(ICC_IGRPEN1_EL1_MASK, vmcr.grpen1);
return 0;
}
static void set_apr_reg(struct kvm_vcpu *vcpu, u64 val, u8 apr, u8 idx)
{
struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;
if (apr)
vgicv3->vgic_ap1r[idx] = val;
else
vgicv3->vgic_ap0r[idx] = val;
}
static u64 get_apr_reg(struct kvm_vcpu *vcpu, u8 apr, u8 idx)
{
struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;
if (apr)
return vgicv3->vgic_ap1r[idx];
else
return vgicv3->vgic_ap0r[idx];
}
static int set_gic_ap0r(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 val)
{
u8 idx = r->Op2 & 3;
if (idx > vgic_v3_max_apr_idx(vcpu))
return -EINVAL;
set_apr_reg(vcpu, val, 0, idx);
return 0;
}
static int get_gic_ap0r(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 *val)
{
u8 idx = r->Op2 & 3;
if (idx > vgic_v3_max_apr_idx(vcpu))
return -EINVAL;
*val = get_apr_reg(vcpu, 0, idx);
return 0;
}
static int set_gic_ap1r(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 val)
{
u8 idx = r->Op2 & 3;
if (idx > vgic_v3_max_apr_idx(vcpu))
return -EINVAL;
set_apr_reg(vcpu, val, 1, idx);
return 0;
}
static int get_gic_ap1r(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 *val)
{
u8 idx = r->Op2 & 3;
if (idx > vgic_v3_max_apr_idx(vcpu))
return -EINVAL;
*val = get_apr_reg(vcpu, 1, idx);
return 0;
}
static int set_gic_sre(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 val)
{
/* Validate SRE bit */
if (!(val & ICC_SRE_EL1_SRE))
return -EINVAL;
return 0;
}
static int get_gic_sre(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
u64 *val)
{
struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;
*val = vgicv3->vgic_sre;
return 0;
}
static const struct sys_reg_desc gic_v3_icc_reg_descs[] = {
{ SYS_DESC(SYS_ICC_PMR_EL1),
.set_user = set_gic_pmr, .get_user = get_gic_pmr, },
{ SYS_DESC(SYS_ICC_BPR0_EL1),
.set_user = set_gic_bpr0, .get_user = get_gic_bpr0, },
{ SYS_DESC(SYS_ICC_AP0R0_EL1),
.set_user = set_gic_ap0r, .get_user = get_gic_ap0r, },
{ SYS_DESC(SYS_ICC_AP0R1_EL1),
.set_user = set_gic_ap0r, .get_user = get_gic_ap0r, },
{ SYS_DESC(SYS_ICC_AP0R2_EL1),
.set_user = set_gic_ap0r, .get_user = get_gic_ap0r, },
{ SYS_DESC(SYS_ICC_AP0R3_EL1),
.set_user = set_gic_ap0r, .get_user = get_gic_ap0r, },
{ SYS_DESC(SYS_ICC_AP1R0_EL1),
.set_user = set_gic_ap1r, .get_user = get_gic_ap1r, },
{ SYS_DESC(SYS_ICC_AP1R1_EL1),
.set_user = set_gic_ap1r, .get_user = get_gic_ap1r, },
{ SYS_DESC(SYS_ICC_AP1R2_EL1),
.set_user = set_gic_ap1r, .get_user = get_gic_ap1r, },
{ SYS_DESC(SYS_ICC_AP1R3_EL1),
.set_user = set_gic_ap1r, .get_user = get_gic_ap1r, },
{ SYS_DESC(SYS_ICC_BPR1_EL1),
.set_user = set_gic_bpr1, .get_user = get_gic_bpr1, },
{ SYS_DESC(SYS_ICC_CTLR_EL1),
.set_user = set_gic_ctlr, .get_user = get_gic_ctlr, },
{ SYS_DESC(SYS_ICC_SRE_EL1),
.set_user = set_gic_sre, .get_user = get_gic_sre, },
{ SYS_DESC(SYS_ICC_IGRPEN0_EL1),
.set_user = set_gic_grpen0, .get_user = get_gic_grpen0, },
{ SYS_DESC(SYS_ICC_IGRPEN1_EL1),
.set_user = set_gic_grpen1, .get_user = get_gic_grpen1, },
};
static u64 attr_to_id(u64 attr)
{
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));
}
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;
return -ENXIO;
}
int vgic_v3_cpu_sysregs_uaccess(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr,
bool is_write)
{
struct kvm_one_reg reg = {
.id = attr_to_id(attr->attr),
.addr = attr->addr,
};
if (is_write)
return kvm_sys_reg_set_user(vcpu, ®, gic_v3_icc_reg_descs,
ARRAY_SIZE(gic_v3_icc_reg_descs));
else
return kvm_sys_reg_get_user(vcpu, ®, gic_v3_icc_reg_descs,
ARRAY_SIZE(gic_v3_icc_reg_descs));
}
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