#include <linux/irqchip/arm-gic-v3.h>
#include <linux/kvm_host.h>
+#include <asm/kvm_emulate.h>
#include <asm/kvm_hyp.h>
#define vtr_to_max_lr_idx(v) ((v) & 0xf)
#define vtr_to_nr_pre_bits(v) ((((u32)(v) >> 26) & 7) + 1)
+#define vtr_to_nr_apr_regs(v) (1 << (vtr_to_nr_pre_bits(v) - 5))
static u64 __hyp_text __gic_v3_get_lr(unsigned int lr)
{
vcpu->arch.vgic_cpu.live_lrs = 0;
} else {
+ if (static_branch_unlikely(&vgic_v3_cpuif_trap))
+ write_gicreg(0, ICH_HCR_EL2);
+
cpu_if->vgic_misr = 0;
cpu_if->vgic_eisr = 0;
cpu_if->vgic_elrsr = 0xffff;
__gic_v3_set_lr(cpu_if->vgic_lr[i], i);
}
+ } else {
+ /*
+ * If we need to trap system registers, we must write
+ * ICH_HCR_EL2 anyway, even if no interrupts are being
+ * injected,
+ */
+ if (static_branch_unlikely(&vgic_v3_cpuif_trap))
+ write_gicreg(cpu_if->vgic_hcr, ICH_HCR_EL2);
}
/*
{
return read_gicreg(ICH_VTR_EL2);
}
+
+u64 __hyp_text __vgic_v3_read_vmcr(void)
+{
+ return read_gicreg(ICH_VMCR_EL2);
+}
+
+void __hyp_text __vgic_v3_write_vmcr(u32 vmcr)
+{
+ write_gicreg(vmcr, ICH_VMCR_EL2);
+}
+
+#ifdef CONFIG_ARM64
+
+static int __hyp_text __vgic_v3_bpr_min(void)
+{
+ /* See Pseudocode for VPriorityGroup */
+ return 8 - vtr_to_nr_pre_bits(read_gicreg(ICH_VTR_EL2));
+}
+
+static int __hyp_text __vgic_v3_get_group(struct kvm_vcpu *vcpu)
+{
+ u32 esr = kvm_vcpu_get_hsr(vcpu);
+ u8 crm = (esr & ESR_ELx_SYS64_ISS_CRM_MASK) >> ESR_ELx_SYS64_ISS_CRM_SHIFT;
+
+ return crm != 8;
+}
+
+#define GICv3_IDLE_PRIORITY 0xff
+
+static int __hyp_text __vgic_v3_highest_priority_lr(struct kvm_vcpu *vcpu,
+ u32 vmcr,
+ u64 *lr_val)
+{
+ unsigned int used_lrs = vcpu->arch.vgic_cpu.used_lrs;
+ u8 priority = GICv3_IDLE_PRIORITY;
+ int i, lr = -1;
+
+ for (i = 0; i < used_lrs; i++) {
+ u64 val = __gic_v3_get_lr(i);
+ u8 lr_prio = (val & ICH_LR_PRIORITY_MASK) >> ICH_LR_PRIORITY_SHIFT;
+
+ /* Not pending in the state? */
+ if ((val & ICH_LR_STATE) != ICH_LR_PENDING_BIT)
+ continue;
+
+ /* Group-0 interrupt, but Group-0 disabled? */
+ if (!(val & ICH_LR_GROUP) && !(vmcr & ICH_VMCR_ENG0_MASK))
+ continue;
+
+ /* Group-1 interrupt, but Group-1 disabled? */
+ if ((val & ICH_LR_GROUP) && !(vmcr & ICH_VMCR_ENG1_MASK))
+ continue;
+
+ /* Not the highest priority? */
+ if (lr_prio >= priority)
+ continue;
+
+ /* This is a candidate */
+ priority = lr_prio;
+ *lr_val = val;
+ lr = i;
+ }
+
+ if (lr == -1)
+ *lr_val = ICC_IAR1_EL1_SPURIOUS;
+
+ return lr;
+}
+
+static int __hyp_text __vgic_v3_find_active_lr(struct kvm_vcpu *vcpu,
+ int intid, u64 *lr_val)
+{
+ unsigned int used_lrs = vcpu->arch.vgic_cpu.used_lrs;
+ int i;
+
+ for (i = 0; i < used_lrs; i++) {
+ u64 val = __gic_v3_get_lr(i);
+
+ if ((val & ICH_LR_VIRTUAL_ID_MASK) == intid &&
+ (val & ICH_LR_ACTIVE_BIT)) {
+ *lr_val = val;
+ return i;
+ }
+ }
+
+ *lr_val = ICC_IAR1_EL1_SPURIOUS;
+ return -1;
+}
+
+static int __hyp_text __vgic_v3_get_highest_active_priority(void)
+{
+ u8 nr_apr_regs = vtr_to_nr_apr_regs(read_gicreg(ICH_VTR_EL2));
+ u32 hap = 0;
+ int i;
+
+ for (i = 0; i < nr_apr_regs; i++) {
+ u32 val;
+
+ /*
+ * The ICH_AP0Rn_EL2 and ICH_AP1Rn_EL2 registers
+ * contain the active priority levels for this VCPU
+ * for the maximum number of supported priority
+ * levels, and we return the full priority level only
+ * if the BPR is programmed to its minimum, otherwise
+ * we return a combination of the priority level and
+ * subpriority, as determined by the setting of the
+ * BPR, but without the full subpriority.
+ */
+ val = __vgic_v3_read_ap0rn(i);
+ val |= __vgic_v3_read_ap1rn(i);
+ if (!val) {
+ hap += 32;
+ continue;
+ }
+
+ return (hap + __ffs(val)) << __vgic_v3_bpr_min();
+ }
+
+ return GICv3_IDLE_PRIORITY;
+}
+
+static unsigned int __hyp_text __vgic_v3_get_bpr0(u32 vmcr)
+{
+ return (vmcr & ICH_VMCR_BPR0_MASK) >> ICH_VMCR_BPR0_SHIFT;
+}
+
+static unsigned int __hyp_text __vgic_v3_get_bpr1(u32 vmcr)
+{
+ unsigned int bpr;
+
+ if (vmcr & ICH_VMCR_CBPR_MASK) {
+ bpr = __vgic_v3_get_bpr0(vmcr);
+ if (bpr < 7)
+ bpr++;
+ } else {
+ bpr = (vmcr & ICH_VMCR_BPR1_MASK) >> ICH_VMCR_BPR1_SHIFT;
+ }
+
+ return bpr;
+}
+
+/*
+ * Convert a priority to a preemption level, taking the relevant BPR
+ * into account by zeroing the sub-priority bits.
+ */
+static u8 __hyp_text __vgic_v3_pri_to_pre(u8 pri, u32 vmcr, int grp)
+{
+ unsigned int bpr;
+
+ if (!grp)
+ bpr = __vgic_v3_get_bpr0(vmcr) + 1;
+ else
+ bpr = __vgic_v3_get_bpr1(vmcr);
+
+ return pri & (GENMASK(7, 0) << bpr);
+}
+
+/*
+ * The priority value is independent of any of the BPR values, so we
+ * normalize it using the minumal BPR value. This guarantees that no
+ * matter what the guest does with its BPR, we can always set/get the
+ * same value of a priority.
+ */
+static void __hyp_text __vgic_v3_set_active_priority(u8 pri, u32 vmcr, int grp)
+{
+ u8 pre, ap;
+ u32 val;
+ int apr;
+
+ pre = __vgic_v3_pri_to_pre(pri, vmcr, grp);
+ ap = pre >> __vgic_v3_bpr_min();
+ apr = ap / 32;
+
+ if (!grp) {
+ val = __vgic_v3_read_ap0rn(apr);
+ __vgic_v3_write_ap0rn(val | BIT(ap % 32), apr);
+ } else {
+ val = __vgic_v3_read_ap1rn(apr);
+ __vgic_v3_write_ap1rn(val | BIT(ap % 32), apr);
+ }
+}
+
+static int __hyp_text __vgic_v3_clear_highest_active_priority(void)
+{
+ u8 nr_apr_regs = vtr_to_nr_apr_regs(read_gicreg(ICH_VTR_EL2));
+ u32 hap = 0;
+ int i;
+
+ for (i = 0; i < nr_apr_regs; i++) {
+ u32 ap0, ap1;
+ int c0, c1;
+
+ ap0 = __vgic_v3_read_ap0rn(i);
+ ap1 = __vgic_v3_read_ap1rn(i);
+ if (!ap0 && !ap1) {
+ hap += 32;
+ continue;
+ }
+
+ c0 = ap0 ? __ffs(ap0) : 32;
+ c1 = ap1 ? __ffs(ap1) : 32;
+
+ /* Always clear the LSB, which is the highest priority */
+ if (c0 < c1) {
+ ap0 &= ~BIT(c0);
+ __vgic_v3_write_ap0rn(ap0, i);
+ hap += c0;
+ } else {
+ ap1 &= ~BIT(c1);
+ __vgic_v3_write_ap1rn(ap1, i);
+ hap += c1;
+ }
+
+ /* Rescale to 8 bits of priority */
+ return hap << __vgic_v3_bpr_min();
+ }
+
+ return GICv3_IDLE_PRIORITY;
+}
+
+static void __hyp_text __vgic_v3_read_iar(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+ u64 lr_val;
+ u8 lr_prio, pmr;
+ int lr, grp;
+
+ grp = __vgic_v3_get_group(vcpu);
+
+ lr = __vgic_v3_highest_priority_lr(vcpu, vmcr, &lr_val);
+ if (lr < 0)
+ goto spurious;
+
+ if (grp != !!(lr_val & ICH_LR_GROUP))
+ goto spurious;
+
+ pmr = (vmcr & ICH_VMCR_PMR_MASK) >> ICH_VMCR_PMR_SHIFT;
+ lr_prio = (lr_val & ICH_LR_PRIORITY_MASK) >> ICH_LR_PRIORITY_SHIFT;
+ if (pmr <= lr_prio)
+ goto spurious;
+
+ if (__vgic_v3_get_highest_active_priority() <= __vgic_v3_pri_to_pre(lr_prio, vmcr, grp))
+ goto spurious;
+
+ lr_val &= ~ICH_LR_STATE;
+ /* No active state for LPIs */
+ if ((lr_val & ICH_LR_VIRTUAL_ID_MASK) <= VGIC_MAX_SPI)
+ lr_val |= ICH_LR_ACTIVE_BIT;
+ __gic_v3_set_lr(lr_val, lr);
+ __vgic_v3_set_active_priority(lr_prio, vmcr, grp);
+ vcpu_set_reg(vcpu, rt, lr_val & ICH_LR_VIRTUAL_ID_MASK);
+ return;
+
+spurious:
+ vcpu_set_reg(vcpu, rt, ICC_IAR1_EL1_SPURIOUS);
+}
+
+static void __hyp_text __vgic_v3_clear_active_lr(int lr, u64 lr_val)
+{
+ lr_val &= ~ICH_LR_ACTIVE_BIT;
+ if (lr_val & ICH_LR_HW) {
+ u32 pid;
+
+ pid = (lr_val & ICH_LR_PHYS_ID_MASK) >> ICH_LR_PHYS_ID_SHIFT;
+ gic_write_dir(pid);
+ }
+
+ __gic_v3_set_lr(lr_val, lr);
+}
+
+static void __hyp_text __vgic_v3_bump_eoicount(void)
+{
+ u32 hcr;
+
+ hcr = read_gicreg(ICH_HCR_EL2);
+ hcr += 1 << ICH_HCR_EOIcount_SHIFT;
+ write_gicreg(hcr, ICH_HCR_EL2);
+}
+
+static void __hyp_text __vgic_v3_write_eoir(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+ u32 vid = vcpu_get_reg(vcpu, rt);
+ u64 lr_val;
+ u8 lr_prio, act_prio;
+ int lr, grp;
+
+ grp = __vgic_v3_get_group(vcpu);
+
+ /* Drop priority in any case */
+ act_prio = __vgic_v3_clear_highest_active_priority();
+
+ /* If EOIing an LPI, no deactivate to be performed */
+ if (vid >= VGIC_MIN_LPI)
+ return;
+
+ /* EOImode == 1, nothing to be done here */
+ if (vmcr & ICH_VMCR_EOIM_MASK)
+ return;
+
+ lr = __vgic_v3_find_active_lr(vcpu, vid, &lr_val);
+ if (lr == -1) {
+ __vgic_v3_bump_eoicount();
+ return;
+ }
+
+ lr_prio = (lr_val & ICH_LR_PRIORITY_MASK) >> ICH_LR_PRIORITY_SHIFT;
+
+ /* If priorities or group do not match, the guest has fscked-up. */
+ if (grp != !!(lr_val & ICH_LR_GROUP) ||
+ __vgic_v3_pri_to_pre(lr_prio, vmcr, grp) != act_prio)
+ return;
+
+ /* Let's now perform the deactivation */
+ __vgic_v3_clear_active_lr(lr, lr_val);
+}
+
+static void __hyp_text __vgic_v3_read_igrpen0(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+ vcpu_set_reg(vcpu, rt, !!(vmcr & ICH_VMCR_ENG0_MASK));
+}
+
+static void __hyp_text __vgic_v3_read_igrpen1(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+ vcpu_set_reg(vcpu, rt, !!(vmcr & ICH_VMCR_ENG1_MASK));
+}
+
+static void __hyp_text __vgic_v3_write_igrpen0(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+ u64 val = vcpu_get_reg(vcpu, rt);
+
+ if (val & 1)
+ vmcr |= ICH_VMCR_ENG0_MASK;
+ else
+ vmcr &= ~ICH_VMCR_ENG0_MASK;
+
+ __vgic_v3_write_vmcr(vmcr);
+}
+
+static void __hyp_text __vgic_v3_write_igrpen1(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+ u64 val = vcpu_get_reg(vcpu, rt);
+
+ if (val & 1)
+ vmcr |= ICH_VMCR_ENG1_MASK;
+ else
+ vmcr &= ~ICH_VMCR_ENG1_MASK;
+
+ __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);
+ u8 bpr_min = __vgic_v3_bpr_min();
+
+ if (vmcr & ICH_VMCR_CBPR_MASK)
+ return;
+
+ /* Enforce BPR limiting */
+ if (val < bpr_min)
+ val = bpr_min;
+
+ 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_read_apxrn(struct kvm_vcpu *vcpu, int rt, int n)
+{
+ u32 val;
+
+ if (!__vgic_v3_get_group(vcpu))
+ val = __vgic_v3_read_ap0rn(n);
+ else
+ val = __vgic_v3_read_ap1rn(n);
+
+ vcpu_set_reg(vcpu, rt, val);
+}
+
+static void __hyp_text __vgic_v3_write_apxrn(struct kvm_vcpu *vcpu, int rt, int n)
+{
+ u32 val = vcpu_get_reg(vcpu, rt);
+
+ if (!__vgic_v3_get_group(vcpu))
+ __vgic_v3_write_ap0rn(val, n);
+ else
+ __vgic_v3_write_ap1rn(val, n);
+}
+
+static void __hyp_text __vgic_v3_read_apxr0(struct kvm_vcpu *vcpu,
+ u32 vmcr, int rt)
+{
+ __vgic_v3_read_apxrn(vcpu, rt, 0);
+}
+
+static void __hyp_text __vgic_v3_read_apxr1(struct kvm_vcpu *vcpu,
+ u32 vmcr, int rt)
+{
+ __vgic_v3_read_apxrn(vcpu, rt, 1);
+}
+
+static void __hyp_text __vgic_v3_read_apxr2(struct kvm_vcpu *vcpu,
+ u32 vmcr, int rt)
+{
+ __vgic_v3_read_apxrn(vcpu, rt, 2);
+}
+
+static void __hyp_text __vgic_v3_read_apxr3(struct kvm_vcpu *vcpu,
+ u32 vmcr, int rt)
+{
+ __vgic_v3_read_apxrn(vcpu, rt, 3);
+}
+
+static void __hyp_text __vgic_v3_write_apxr0(struct kvm_vcpu *vcpu,
+ u32 vmcr, int rt)
+{
+ __vgic_v3_write_apxrn(vcpu, rt, 0);
+}
+
+static void __hyp_text __vgic_v3_write_apxr1(struct kvm_vcpu *vcpu,
+ u32 vmcr, int rt)
+{
+ __vgic_v3_write_apxrn(vcpu, rt, 1);
+}
+
+static void __hyp_text __vgic_v3_write_apxr2(struct kvm_vcpu *vcpu,
+ u32 vmcr, int rt)
+{
+ __vgic_v3_write_apxrn(vcpu, rt, 2);
+}
+
+static void __hyp_text __vgic_v3_write_apxr3(struct kvm_vcpu *vcpu,
+ u32 vmcr, int rt)
+{
+ __vgic_v3_write_apxrn(vcpu, rt, 3);
+}
+
+static void __hyp_text __vgic_v3_read_hppir(struct kvm_vcpu *vcpu,
+ u32 vmcr, int rt)
+{
+ u64 lr_val;
+ int lr, lr_grp, grp;
+
+ grp = __vgic_v3_get_group(vcpu);
+
+ lr = __vgic_v3_highest_priority_lr(vcpu, vmcr, &lr_val);
+ if (lr == -1)
+ goto spurious;
+
+ lr_grp = !!(lr_val & ICH_LR_GROUP);
+ if (lr_grp != grp)
+ lr_val = ICC_IAR1_EL1_SPURIOUS;
+
+spurious:
+ vcpu_set_reg(vcpu, rt, lr_val & ICH_LR_VIRTUAL_ID_MASK);
+}
+
+int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu)
+{
+ int rt;
+ u32 esr;
+ u32 vmcr;
+ void (*fn)(struct kvm_vcpu *, u32, int);
+ bool is_read;
+ u32 sysreg;
+
+ esr = kvm_vcpu_get_hsr(vcpu);
+ if (vcpu_mode_is_32bit(vcpu)) {
+ if (!kvm_condition_valid(vcpu))
+ return 1;
+
+ sysreg = esr_cp15_to_sysreg(esr);
+ } else {
+ sysreg = esr_sys64_to_sysreg(esr);
+ }
+
+ is_read = (esr & ESR_ELx_SYS64_ISS_DIR_MASK) == ESR_ELx_SYS64_ISS_DIR_READ;
+
+ switch (sysreg) {
+ case ICC_IAR0_EL1:
+ case ICC_IAR1_EL1:
+ fn = __vgic_v3_read_iar;
+ break;
+ case ICC_EOIR0_EL1:
+ case ICC_EOIR1_EL1:
+ fn = __vgic_v3_write_eoir;
+ break;
+ case ICC_GRPEN1_EL1:
+ if (is_read)
+ fn = __vgic_v3_read_igrpen1;
+ else
+ fn = __vgic_v3_write_igrpen1;
+ break;
+ case ICC_BPR1_EL1:
+ if (is_read)
+ fn = __vgic_v3_read_bpr1;
+ else
+ fn = __vgic_v3_write_bpr1;
+ break;
+ case ICC_AP0Rn_EL1(0):
+ case ICC_AP1Rn_EL1(0):
+ if (is_read)
+ fn = __vgic_v3_read_apxr0;
+ else
+ fn = __vgic_v3_write_apxr0;
+ break;
+ case ICC_AP0Rn_EL1(1):
+ case ICC_AP1Rn_EL1(1):
+ if (is_read)
+ fn = __vgic_v3_read_apxr1;
+ else
+ fn = __vgic_v3_write_apxr1;
+ break;
+ case ICC_AP0Rn_EL1(2):
+ case ICC_AP1Rn_EL1(2):
+ if (is_read)
+ fn = __vgic_v3_read_apxr2;
+ else
+ fn = __vgic_v3_write_apxr2;
+ break;
+ case ICC_AP0Rn_EL1(3):
+ case ICC_AP1Rn_EL1(3):
+ if (is_read)
+ fn = __vgic_v3_read_apxr3;
+ else
+ fn = __vgic_v3_write_apxr3;
+ break;
+ case ICC_HPPIR0_EL1:
+ case ICC_HPPIR1_EL1:
+ fn = __vgic_v3_read_hppir;
+ break;
+ case ICC_GRPEN0_EL1:
+ if (is_read)
+ fn = __vgic_v3_read_igrpen0;
+ else
+ fn = __vgic_v3_write_igrpen0;
+ break;
+ case ICC_BPR0_EL1:
+ if (is_read)
+ fn = __vgic_v3_read_bpr0;
+ else
+ fn = __vgic_v3_write_bpr0;
+ break;
+ default:
+ return 0;
+ }
+
+ vmcr = __vgic_v3_read_vmcr();
+ rt = kvm_vcpu_sys_get_rt(vcpu);
+ fn(vcpu, vmcr, rt);
+
+ return 1;
+}
+
+#endif
projects / mirror_ubuntu-zesty-kernel.git / blobdiff