^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2015, 2016 ARM Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/kvm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kvm_host.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/list_sort.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/nospec.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/kvm_hyp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "vgic.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define CREATE_TRACE_POINTS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include "trace.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) struct vgic_global kvm_vgic_global_state __ro_after_init = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) .gicv3_cpuif = STATIC_KEY_FALSE_INIT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * Locking order is always:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * kvm->lock (mutex)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * its->cmd_lock (mutex)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * its->its_lock (mutex)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * vgic_cpu->ap_list_lock must be taken with IRQs disabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * kvm->lpi_list_lock must be taken with IRQs disabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * vgic_irq->irq_lock must be taken with IRQs disabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * As the ap_list_lock might be taken from the timer interrupt handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * we have to disable IRQs before taking this lock and everything lower
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * than it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * If you need to take multiple locks, always take the upper lock first,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * then the lower ones, e.g. first take the its_lock, then the irq_lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * If you are already holding a lock and need to take a higher one, you
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * have to drop the lower ranking lock first and re-aquire it after having
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * taken the upper one.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * When taking more than one ap_list_lock at the same time, always take the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * lowest numbered VCPU's ap_list_lock first, so:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * vcpuX->vcpu_id < vcpuY->vcpu_id:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * raw_spin_lock(vcpuX->arch.vgic_cpu.ap_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * raw_spin_lock(vcpuY->arch.vgic_cpu.ap_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * Since the VGIC must support injecting virtual interrupts from ISRs, we have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * to use the raw_spin_lock_irqsave/raw_spin_unlock_irqrestore versions of outer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * spinlocks for any lock that may be taken while injecting an interrupt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * Iterate over the VM's list of mapped LPIs to find the one with a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * matching interrupt ID and return a reference to the IRQ structure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static struct vgic_irq *vgic_get_lpi(struct kvm *kvm, u32 intid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) struct vgic_dist *dist = &kvm->arch.vgic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct vgic_irq *irq = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) if (irq->intid != intid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * This increases the refcount, the caller is expected to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * call vgic_put_irq() later once it's finished with the IRQ.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) vgic_get_irq_kref(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) irq = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * This looks up the virtual interrupt ID to get the corresponding
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * struct vgic_irq. It also increases the refcount, so any caller is expected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * to call vgic_put_irq() once it's finished with this IRQ.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) u32 intid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /* SGIs and PPIs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (intid <= VGIC_MAX_PRIVATE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) intid = array_index_nospec(intid, VGIC_MAX_PRIVATE + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return &vcpu->arch.vgic_cpu.private_irqs[intid];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /* SPIs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (intid < (kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) intid = array_index_nospec(intid, kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return &kvm->arch.vgic.spis[intid - VGIC_NR_PRIVATE_IRQS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /* LPIs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (intid >= VGIC_MIN_LPI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return vgic_get_lpi(kvm, intid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) WARN(1, "Looking up struct vgic_irq for reserved INTID");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * We can't do anything in here, because we lack the kvm pointer to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) * lock and remove the item from the lpi_list. So we keep this function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) * empty and use the return value of kref_put() to trigger the freeing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static void vgic_irq_release(struct kref *ref)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) * Drop the refcount on the LPI. Must be called with lpi_list_lock held.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) void __vgic_put_lpi_locked(struct kvm *kvm, struct vgic_irq *irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct vgic_dist *dist = &kvm->arch.vgic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) if (!kref_put(&irq->refcount, vgic_irq_release))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) list_del(&irq->lpi_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) dist->lpi_list_count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) kfree(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) struct vgic_dist *dist = &kvm->arch.vgic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (irq->intid < VGIC_MIN_LPI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) __vgic_put_lpi_locked(kvm, irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) void vgic_flush_pending_lpis(struct kvm_vcpu *vcpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) struct vgic_irq *irq, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) raw_spin_lock_irqsave(&vgic_cpu->ap_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) list_for_each_entry_safe(irq, tmp, &vgic_cpu->ap_list_head, ap_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (irq->intid >= VGIC_MIN_LPI) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) raw_spin_lock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) list_del(&irq->ap_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) irq->vcpu = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) raw_spin_unlock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) vgic_put_irq(vcpu->kvm, irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) raw_spin_unlock_irqrestore(&vgic_cpu->ap_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) void vgic_irq_set_phys_pending(struct vgic_irq *irq, bool pending)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) WARN_ON(irq_set_irqchip_state(irq->host_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) IRQCHIP_STATE_PENDING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) pending));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) bool vgic_get_phys_line_level(struct vgic_irq *irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) bool line_level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) BUG_ON(!irq->hw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) if (irq->get_input_level)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) return irq->get_input_level(irq->intid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) WARN_ON(irq_get_irqchip_state(irq->host_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) IRQCHIP_STATE_PENDING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) &line_level));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) return line_level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) /* Set/Clear the physical active state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) void vgic_irq_set_phys_active(struct vgic_irq *irq, bool active)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) BUG_ON(!irq->hw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) WARN_ON(irq_set_irqchip_state(irq->host_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) IRQCHIP_STATE_ACTIVE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) active));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) * kvm_vgic_target_oracle - compute the target vcpu for an irq
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * @irq: The irq to route. Must be already locked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) * Based on the current state of the interrupt (enabled, pending,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) * active, vcpu and target_vcpu), compute the next vcpu this should be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) * given to. Return NULL if this shouldn't be injected at all.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) * Requires the IRQ lock to be held.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static struct kvm_vcpu *vgic_target_oracle(struct vgic_irq *irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) lockdep_assert_held(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) /* If the interrupt is active, it must stay on the current vcpu */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) if (irq->active)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) return irq->vcpu ? : irq->target_vcpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) * If the IRQ is not active but enabled and pending, we should direct
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) * it to its configured target VCPU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) * If the distributor is disabled, pending interrupts shouldn't be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) * forwarded.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) if (irq->enabled && irq_is_pending(irq)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (unlikely(irq->target_vcpu &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) !irq->target_vcpu->kvm->arch.vgic.enabled))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) return irq->target_vcpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) /* If neither active nor pending and enabled, then this IRQ should not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) * be queued to any VCPU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) * The order of items in the ap_lists defines how we'll pack things in LRs as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) * well, the first items in the list being the first things populated in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) * LRs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) * A hard rule is that active interrupts can never be pushed out of the LRs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) * (and therefore take priority) since we cannot reliably trap on deactivation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) * of IRQs and therefore they have to be present in the LRs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * Otherwise things should be sorted by the priority field and the GIC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) * hardware support will take care of preemption of priority groups etc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) * Return negative if "a" sorts before "b", 0 to preserve order, and positive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) * to sort "b" before "a".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) static int vgic_irq_cmp(void *priv, struct list_head *a, struct list_head *b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) struct vgic_irq *irqa = container_of(a, struct vgic_irq, ap_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) struct vgic_irq *irqb = container_of(b, struct vgic_irq, ap_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) bool penda, pendb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) * list_sort may call this function with the same element when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) * the list is fairly long.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) if (unlikely(irqa == irqb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) raw_spin_lock(&irqa->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) raw_spin_lock_nested(&irqb->irq_lock, SINGLE_DEPTH_NESTING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (irqa->active || irqb->active) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) ret = (int)irqb->active - (int)irqa->active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) penda = irqa->enabled && irq_is_pending(irqa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) pendb = irqb->enabled && irq_is_pending(irqb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) if (!penda || !pendb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) ret = (int)pendb - (int)penda;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) /* Both pending and enabled, sort by priority */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) ret = irqa->priority - irqb->priority;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) raw_spin_unlock(&irqb->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) raw_spin_unlock(&irqa->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) /* Must be called with the ap_list_lock held */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) static void vgic_sort_ap_list(struct kvm_vcpu *vcpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) lockdep_assert_held(&vgic_cpu->ap_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) list_sort(NULL, &vgic_cpu->ap_list_head, vgic_irq_cmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) * Only valid injection if changing level for level-triggered IRQs or for a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) * rising edge, and in-kernel connected IRQ lines can only be controlled by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) * their owner.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) static bool vgic_validate_injection(struct vgic_irq *irq, bool level, void *owner)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) if (irq->owner != owner)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) switch (irq->config) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) case VGIC_CONFIG_LEVEL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) return irq->line_level != level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) case VGIC_CONFIG_EDGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) return level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) * Check whether an IRQ needs to (and can) be queued to a VCPU's ap list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) * Do the queuing if necessary, taking the right locks in the right order.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) * Returns true when the IRQ was queued, false otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) * Needs to be entered with the IRQ lock already held, but will return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) * with all locks dropped.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) struct kvm_vcpu *vcpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) lockdep_assert_held(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) vcpu = vgic_target_oracle(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (irq->vcpu || !vcpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * If this IRQ is already on a VCPU's ap_list, then it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) * cannot be moved or modified and there is no more work for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) * us to do.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) * Otherwise, if the irq is not pending and enabled, it does
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) * not need to be inserted into an ap_list and there is also
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) * no more work for us to do.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) * We have to kick the VCPU here, because we could be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) * queueing an edge-triggered interrupt for which we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) * get no EOI maintenance interrupt. In that case,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) * while the IRQ is already on the VCPU's AP list, the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) * VCPU could have EOI'ed the original interrupt and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) * won't see this one until it exits for some other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) * reason.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) if (vcpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) kvm_vcpu_kick(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) * We must unlock the irq lock to take the ap_list_lock where
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) * we are going to insert this new pending interrupt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) /* someone can do stuff here, which we re-check below */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) raw_spin_lock_irqsave(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) raw_spin_lock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) * Did something change behind our backs?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) * There are two cases:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) * 1) The irq lost its pending state or was disabled behind our
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) * backs and/or it was queued to another VCPU's ap_list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) * 2) Someone changed the affinity on this irq behind our
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) * backs and we are now holding the wrong ap_list_lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) * In both cases, drop the locks and retry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) if (unlikely(irq->vcpu || vcpu != vgic_target_oracle(irq))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) raw_spin_unlock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) raw_spin_unlock_irqrestore(&vcpu->arch.vgic_cpu.ap_list_lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) raw_spin_lock_irqsave(&irq->irq_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) * Grab a reference to the irq to reflect the fact that it is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) * now in the ap_list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) vgic_get_irq_kref(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) list_add_tail(&irq->ap_list, &vcpu->arch.vgic_cpu.ap_list_head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) irq->vcpu = vcpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) raw_spin_unlock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) raw_spin_unlock_irqrestore(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) kvm_vcpu_kick(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) * kvm_vgic_inject_irq - Inject an IRQ from a device to the vgic
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) * @kvm: The VM structure pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) * @cpuid: The CPU for PPIs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) * @intid: The INTID to inject a new state to.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) * @level: Edge-triggered: true: to trigger the interrupt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) * false: to ignore the call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) * Level-sensitive true: raise the input signal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) * false: lower the input signal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) * @owner: The opaque pointer to the owner of the IRQ being raised to verify
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) * that the caller is allowed to inject this IRQ. Userspace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) * injections will have owner == NULL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) * The VGIC is not concerned with devices being active-LOW or active-HIGH for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) * level-sensitive interrupts. You can think of the level parameter as 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) * being HIGH and 0 being LOW and all devices being active-HIGH.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) bool level, void *owner)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) struct kvm_vcpu *vcpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) struct vgic_irq *irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) trace_vgic_update_irq_pending(cpuid, intid, level);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) ret = vgic_lazy_init(kvm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) vcpu = kvm_get_vcpu(kvm, cpuid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) if (!vcpu && intid < VGIC_NR_PRIVATE_IRQS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) irq = vgic_get_irq(kvm, vcpu, intid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) if (!irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) raw_spin_lock_irqsave(&irq->irq_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) if (!vgic_validate_injection(irq, level, owner)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) /* Nothing to see here, move along... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) vgic_put_irq(kvm, irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) if (irq->config == VGIC_CONFIG_LEVEL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) irq->line_level = level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) irq->pending_latch = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) vgic_queue_irq_unlock(kvm, irq, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) vgic_put_irq(kvm, irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) /* @irq->irq_lock must be held */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) static int kvm_vgic_map_irq(struct kvm_vcpu *vcpu, struct vgic_irq *irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) unsigned int host_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) bool (*get_input_level)(int vindid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) struct irq_desc *desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) struct irq_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) * Find the physical IRQ number corresponding to @host_irq
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) desc = irq_to_desc(host_irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) if (!desc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) kvm_err("%s: no interrupt descriptor\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) data = irq_desc_get_irq_data(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) while (data->parent_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) data = data->parent_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) irq->hw = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) irq->host_irq = host_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) irq->hwintid = data->hwirq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) irq->get_input_level = get_input_level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) /* @irq->irq_lock must be held */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) static inline void kvm_vgic_unmap_irq(struct vgic_irq *irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) irq->hw = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) irq->hwintid = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) irq->get_input_level = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) u32 vintid, bool (*get_input_level)(int vindid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) BUG_ON(!irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) raw_spin_lock_irqsave(&irq->irq_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) ret = kvm_vgic_map_irq(vcpu, irq, host_irq, get_input_level);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) vgic_put_irq(vcpu->kvm, irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) * kvm_vgic_reset_mapped_irq - Reset a mapped IRQ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) * @vcpu: The VCPU pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) * @vintid: The INTID of the interrupt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) * Reset the active and pending states of a mapped interrupt. Kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) * subsystems injecting mapped interrupts should reset their interrupt lines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) * when we are doing a reset of the VM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) void kvm_vgic_reset_mapped_irq(struct kvm_vcpu *vcpu, u32 vintid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) if (!irq->hw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) raw_spin_lock_irqsave(&irq->irq_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) irq->active = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) irq->pending_latch = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) irq->line_level = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) vgic_put_irq(vcpu->kvm, irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int vintid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) struct vgic_irq *irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) if (!vgic_initialized(vcpu->kvm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) BUG_ON(!irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) raw_spin_lock_irqsave(&irq->irq_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) kvm_vgic_unmap_irq(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) vgic_put_irq(vcpu->kvm, irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) * kvm_vgic_set_owner - Set the owner of an interrupt for a VM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) * @vcpu: Pointer to the VCPU (used for PPIs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) * @intid: The virtual INTID identifying the interrupt (PPI or SPI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) * @owner: Opaque pointer to the owner
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) * Returns 0 if intid is not already used by another in-kernel device and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) * owner is set, otherwise returns an error code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) int kvm_vgic_set_owner(struct kvm_vcpu *vcpu, unsigned int intid, void *owner)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) struct vgic_irq *irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) if (!vgic_initialized(vcpu->kvm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) /* SGIs and LPIs cannot be wired up to any device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) if (!irq_is_ppi(intid) && !vgic_valid_spi(vcpu->kvm, intid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) irq = vgic_get_irq(vcpu->kvm, vcpu, intid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) raw_spin_lock_irqsave(&irq->irq_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) if (irq->owner && irq->owner != owner)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) ret = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) irq->owner = owner;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) * vgic_prune_ap_list - Remove non-relevant interrupts from the list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) * @vcpu: The VCPU pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) * Go over the list of "interesting" interrupts, and prune those that we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) * won't have to consider in the near future.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) static void vgic_prune_ap_list(struct kvm_vcpu *vcpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) struct vgic_irq *irq, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) raw_spin_lock(&vgic_cpu->ap_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) list_for_each_entry_safe(irq, tmp, &vgic_cpu->ap_list_head, ap_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) struct kvm_vcpu *target_vcpu, *vcpuA, *vcpuB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) bool target_vcpu_needs_kick = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) raw_spin_lock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) BUG_ON(vcpu != irq->vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) target_vcpu = vgic_target_oracle(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) if (!target_vcpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) * We don't need to process this interrupt any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) * further, move it off the list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) list_del(&irq->ap_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) irq->vcpu = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) raw_spin_unlock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) * This vgic_put_irq call matches the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) * vgic_get_irq_kref in vgic_queue_irq_unlock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) * where we added the LPI to the ap_list. As
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) * we remove the irq from the list, we drop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) * also drop the refcount.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) vgic_put_irq(vcpu->kvm, irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) if (target_vcpu == vcpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) /* We're on the right CPU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) raw_spin_unlock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) /* This interrupt looks like it has to be migrated. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) raw_spin_unlock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) raw_spin_unlock(&vgic_cpu->ap_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) * Ensure locking order by always locking the smallest
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) * ID first.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) if (vcpu->vcpu_id < target_vcpu->vcpu_id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) vcpuA = vcpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) vcpuB = target_vcpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) vcpuA = target_vcpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) vcpuB = vcpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) raw_spin_lock(&vcpuA->arch.vgic_cpu.ap_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) raw_spin_lock_nested(&vcpuB->arch.vgic_cpu.ap_list_lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) SINGLE_DEPTH_NESTING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) raw_spin_lock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) * If the affinity has been preserved, move the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) * interrupt around. Otherwise, it means things have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) * changed while the interrupt was unlocked, and we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) * need to replay this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) * In all cases, we cannot trust the list not to have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) * changed, so we restart from the beginning.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) if (target_vcpu == vgic_target_oracle(irq)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) struct vgic_cpu *new_cpu = &target_vcpu->arch.vgic_cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) list_del(&irq->ap_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) irq->vcpu = target_vcpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) list_add_tail(&irq->ap_list, &new_cpu->ap_list_head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) target_vcpu_needs_kick = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) raw_spin_unlock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) raw_spin_unlock(&vcpuB->arch.vgic_cpu.ap_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) raw_spin_unlock(&vcpuA->arch.vgic_cpu.ap_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) if (target_vcpu_needs_kick) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) kvm_make_request(KVM_REQ_IRQ_PENDING, target_vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) kvm_vcpu_kick(target_vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) raw_spin_unlock(&vgic_cpu->ap_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) static inline void vgic_fold_lr_state(struct kvm_vcpu *vcpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) if (kvm_vgic_global_state.type == VGIC_V2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) vgic_v2_fold_lr_state(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) vgic_v3_fold_lr_state(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) /* Requires the irq_lock to be held. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) static inline void vgic_populate_lr(struct kvm_vcpu *vcpu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) struct vgic_irq *irq, int lr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) lockdep_assert_held(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) if (kvm_vgic_global_state.type == VGIC_V2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) vgic_v2_populate_lr(vcpu, irq, lr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) vgic_v3_populate_lr(vcpu, irq, lr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) static inline void vgic_clear_lr(struct kvm_vcpu *vcpu, int lr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) if (kvm_vgic_global_state.type == VGIC_V2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) vgic_v2_clear_lr(vcpu, lr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) vgic_v3_clear_lr(vcpu, lr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) static inline void vgic_set_underflow(struct kvm_vcpu *vcpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) if (kvm_vgic_global_state.type == VGIC_V2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) vgic_v2_set_underflow(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) vgic_v3_set_underflow(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) /* Requires the ap_list_lock to be held. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) static int compute_ap_list_depth(struct kvm_vcpu *vcpu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) bool *multi_sgi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) struct vgic_irq *irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) int count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) *multi_sgi = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) lockdep_assert_held(&vgic_cpu->ap_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) int w;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) raw_spin_lock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) /* GICv2 SGIs can count for more than one... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) w = vgic_irq_get_lr_count(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) raw_spin_unlock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) count += w;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) *multi_sgi |= (w > 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) /* Requires the VCPU's ap_list_lock to be held. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) static void vgic_flush_lr_state(struct kvm_vcpu *vcpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) struct vgic_irq *irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) int count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) bool multi_sgi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) u8 prio = 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) int i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) lockdep_assert_held(&vgic_cpu->ap_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) count = compute_ap_list_depth(vcpu, &multi_sgi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) if (count > kvm_vgic_global_state.nr_lr || multi_sgi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) vgic_sort_ap_list(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) raw_spin_lock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) * If we have multi-SGIs in the pipeline, we need to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) * guarantee that they are all seen before any IRQ of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) * lower priority. In that case, we need to filter out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) * these interrupts by exiting early. This is easy as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) * the AP list has been sorted already.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) if (multi_sgi && irq->priority > prio) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) _raw_spin_unlock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) if (likely(vgic_target_oracle(irq) == vcpu)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) vgic_populate_lr(vcpu, irq, count++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) if (irq->source)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) prio = irq->priority;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) raw_spin_unlock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) if (count == kvm_vgic_global_state.nr_lr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) if (!list_is_last(&irq->ap_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) &vgic_cpu->ap_list_head))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) vgic_set_underflow(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) /* Nuke remaining LRs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) for (i = count ; i < kvm_vgic_global_state.nr_lr; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) vgic_clear_lr(vcpu, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) vcpu->arch.vgic_cpu.vgic_v2.used_lrs = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) vcpu->arch.vgic_cpu.vgic_v3.used_lrs = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) static inline bool can_access_vgic_from_kernel(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) * GICv2 can always be accessed from the kernel because it is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) * memory-mapped, and VHE systems can access GICv3 EL2 system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) * registers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) return !static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif) || has_vhe();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) static inline void vgic_save_state(struct kvm_vcpu *vcpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) vgic_v2_save_state(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) __vgic_v3_save_state(&vcpu->arch.vgic_cpu.vgic_v3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) /* Sync back the hardware VGIC state into our emulation after a guest's run. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) int used_lrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) /* An empty ap_list_head implies used_lrs == 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) if (list_empty(&vcpu->arch.vgic_cpu.ap_list_head))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) if (can_access_vgic_from_kernel())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) vgic_save_state(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) used_lrs = vcpu->arch.vgic_cpu.vgic_v2.used_lrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) used_lrs = vcpu->arch.vgic_cpu.vgic_v3.used_lrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) if (used_lrs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) vgic_fold_lr_state(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) vgic_prune_ap_list(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) static inline void vgic_restore_state(struct kvm_vcpu *vcpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) vgic_v2_restore_state(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) __vgic_v3_restore_state(&vcpu->arch.vgic_cpu.vgic_v3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) /* Flush our emulation state into the GIC hardware before entering the guest. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) * If there are no virtual interrupts active or pending for this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) * VCPU, then there is no work to do and we can bail out without
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) * taking any lock. There is a potential race with someone injecting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) * interrupts to the VCPU, but it is a benign race as the VCPU will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) * either observe the new interrupt before or after doing this check,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) * and introducing additional synchronization mechanism doesn't change
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) * this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) * Note that we still need to go through the whole thing if anything
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) * can be directly injected (GICv4).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) if (list_empty(&vcpu->arch.vgic_cpu.ap_list_head) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) !vgic_supports_direct_msis(vcpu->kvm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) if (!list_empty(&vcpu->arch.vgic_cpu.ap_list_head)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) raw_spin_lock(&vcpu->arch.vgic_cpu.ap_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) vgic_flush_lr_state(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) raw_spin_unlock(&vcpu->arch.vgic_cpu.ap_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) if (can_access_vgic_from_kernel())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) vgic_restore_state(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) if (vgic_supports_direct_msis(vcpu->kvm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) vgic_v4_commit(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) void kvm_vgic_load(struct kvm_vcpu *vcpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) if (unlikely(!vgic_initialized(vcpu->kvm)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) if (kvm_vgic_global_state.type == VGIC_V2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) vgic_v2_load(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) vgic_v3_load(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) void kvm_vgic_put(struct kvm_vcpu *vcpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) if (unlikely(!vgic_initialized(vcpu->kvm)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) if (kvm_vgic_global_state.type == VGIC_V2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) vgic_v2_put(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) vgic_v3_put(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) void kvm_vgic_vmcr_sync(struct kvm_vcpu *vcpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) if (unlikely(!irqchip_in_kernel(vcpu->kvm)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) if (kvm_vgic_global_state.type == VGIC_V2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) vgic_v2_vmcr_sync(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) vgic_v3_vmcr_sync(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) struct vgic_irq *irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) bool pending = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) struct vgic_vmcr vmcr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) if (!vcpu->kvm->arch.vgic.enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) if (vcpu->arch.vgic_cpu.vgic_v3.its_vpe.pending_last)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) vgic_get_vmcr(vcpu, &vmcr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) raw_spin_lock_irqsave(&vgic_cpu->ap_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) raw_spin_lock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) pending = irq_is_pending(irq) && irq->enabled &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) !irq->active &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) irq->priority < vmcr.pmr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) raw_spin_unlock(&irq->irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) if (pending)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) raw_spin_unlock_irqrestore(&vgic_cpu->ap_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) return pending;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) void vgic_kick_vcpus(struct kvm *kvm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) struct kvm_vcpu *vcpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) int c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) * We've injected an interrupt, time to find out who deserves
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) * a good kick...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) kvm_for_each_vcpu(c, vcpu, kvm) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) if (kvm_vgic_vcpu_pending_irq(vcpu)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) kvm_vcpu_kick(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int vintid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) struct vgic_irq *irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) bool map_is_active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) if (!vgic_initialized(vcpu->kvm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) raw_spin_lock_irqsave(&irq->irq_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) map_is_active = irq->hw && irq->active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) vgic_put_irq(vcpu->kvm, irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) return map_is_active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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