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Diffstat (limited to 'virt/kvm/arm/vgic/vgic-v2.c')
-rw-r--r--virt/kvm/arm/vgic/vgic-v2.c504
1 files changed, 0 insertions, 504 deletions
diff --git a/virt/kvm/arm/vgic/vgic-v2.c b/virt/kvm/arm/vgic/vgic-v2.c
deleted file mode 100644
index 621cc168fe3f..000000000000
--- a/virt/kvm/arm/vgic/vgic-v2.c
+++ /dev/null
@@ -1,504 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2015, 2016 ARM Ltd.
- */
-
-#include <linux/irqchip/arm-gic.h>
-#include <linux/kvm.h>
-#include <linux/kvm_host.h>
-#include <kvm/arm_vgic.h>
-#include <asm/kvm_mmu.h>
-
-#include "vgic.h"
-
-static inline void vgic_v2_write_lr(int lr, u32 val)
-{
- void __iomem *base = kvm_vgic_global_state.vctrl_base;
-
- writel_relaxed(val, base + GICH_LR0 + (lr * 4));
-}
-
-void vgic_v2_init_lrs(void)
-{
- int i;
-
- for (i = 0; i < kvm_vgic_global_state.nr_lr; i++)
- vgic_v2_write_lr(i, 0);
-}
-
-void vgic_v2_set_underflow(struct kvm_vcpu *vcpu)
-{
- struct vgic_v2_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v2;
-
- cpuif->vgic_hcr |= GICH_HCR_UIE;
-}
-
-static bool lr_signals_eoi_mi(u32 lr_val)
-{
- return !(lr_val & GICH_LR_STATE) && (lr_val & GICH_LR_EOI) &&
- !(lr_val & GICH_LR_HW);
-}
-
-/*
- * transfer the content of the LRs back into the corresponding ap_list:
- * - active bit is transferred as is
- * - pending bit is
- * - transferred as is in case of edge sensitive IRQs
- * - set to the line-level (resample time) for level sensitive IRQs
- */
-void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu)
-{
- struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
- struct vgic_v2_cpu_if *cpuif = &vgic_cpu->vgic_v2;
- int lr;
-
- DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
-
- cpuif->vgic_hcr &= ~GICH_HCR_UIE;
-
- for (lr = 0; lr < vgic_cpu->used_lrs; lr++) {
- u32 val = cpuif->vgic_lr[lr];
- u32 cpuid, intid = val & GICH_LR_VIRTUALID;
- struct vgic_irq *irq;
-
- /* Extract the source vCPU id from the LR */
- cpuid = val & GICH_LR_PHYSID_CPUID;
- cpuid >>= GICH_LR_PHYSID_CPUID_SHIFT;
- cpuid &= 7;
-
- /* Notify fds when the guest EOI'ed a level-triggered SPI */
- if (lr_signals_eoi_mi(val) && vgic_valid_spi(vcpu->kvm, intid))
- kvm_notify_acked_irq(vcpu->kvm, 0,
- intid - VGIC_NR_PRIVATE_IRQS);
-
- irq = vgic_get_irq(vcpu->kvm, vcpu, intid);
-
- raw_spin_lock(&irq->irq_lock);
-
- /* Always preserve the active bit */
- irq->active = !!(val & GICH_LR_ACTIVE_BIT);
-
- if (irq->active && vgic_irq_is_sgi(intid))
- irq->active_source = cpuid;
-
- /* Edge is the only case where we preserve the pending bit */
- if (irq->config == VGIC_CONFIG_EDGE &&
- (val & GICH_LR_PENDING_BIT)) {
- irq->pending_latch = true;
-
- if (vgic_irq_is_sgi(intid))
- irq->source |= (1 << cpuid);
- }
-
- /*
- * Clear soft pending state when level irqs have been acked.
- */
- if (irq->config == VGIC_CONFIG_LEVEL && !(val & GICH_LR_STATE))
- irq->pending_latch = false;
-
- /*
- * Level-triggered mapped IRQs are special because we only
- * observe rising edges as input to the VGIC.
- *
- * If the guest never acked the interrupt we have to sample
- * the physical line and set the line level, because the
- * device state could have changed or we simply need to
- * process the still pending interrupt later.
- *
- * If this causes us to lower the level, we have to also clear
- * the physical active state, since we will otherwise never be
- * told when the interrupt becomes asserted again.
- */
- if (vgic_irq_is_mapped_level(irq) && (val & GICH_LR_PENDING_BIT)) {
- irq->line_level = vgic_get_phys_line_level(irq);
-
- if (!irq->line_level)
- vgic_irq_set_phys_active(irq, false);
- }
-
- raw_spin_unlock(&irq->irq_lock);
- vgic_put_irq(vcpu->kvm, irq);
- }
-
- vgic_cpu->used_lrs = 0;
-}
-
-/*
- * Populates the particular LR with the state of a given IRQ:
- * - for an edge sensitive IRQ the pending state is cleared in struct vgic_irq
- * - for a level sensitive IRQ the pending state value is unchanged;
- * it is dictated directly by the input level
- *
- * If @irq describes an SGI with multiple sources, we choose the
- * lowest-numbered source VCPU and clear that bit in the source bitmap.
- *
- * The irq_lock must be held by the caller.
- */
-void vgic_v2_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr)
-{
- u32 val = irq->intid;
- bool allow_pending = true;
-
- if (irq->active) {
- val |= GICH_LR_ACTIVE_BIT;
- if (vgic_irq_is_sgi(irq->intid))
- val |= irq->active_source << GICH_LR_PHYSID_CPUID_SHIFT;
- if (vgic_irq_is_multi_sgi(irq)) {
- allow_pending = false;
- val |= GICH_LR_EOI;
- }
- }
-
- if (irq->group)
- val |= GICH_LR_GROUP1;
-
- if (irq->hw) {
- val |= GICH_LR_HW;
- val |= irq->hwintid << GICH_LR_PHYSID_CPUID_SHIFT;
- /*
- * Never set pending+active on a HW interrupt, as the
- * pending state is kept at the physical distributor
- * level.
- */
- if (irq->active)
- allow_pending = false;
- } else {
- if (irq->config == VGIC_CONFIG_LEVEL) {
- val |= GICH_LR_EOI;
-
- /*
- * Software resampling doesn't work very well
- * if we allow P+A, so let's not do that.
- */
- if (irq->active)
- allow_pending = false;
- }
- }
-
- if (allow_pending && irq_is_pending(irq)) {
- val |= GICH_LR_PENDING_BIT;
-
- if (irq->config == VGIC_CONFIG_EDGE)
- irq->pending_latch = false;
-
- if (vgic_irq_is_sgi(irq->intid)) {
- u32 src = ffs(irq->source);
-
- if (WARN_RATELIMIT(!src, "No SGI source for INTID %d\n",
- irq->intid))
- return;
-
- val |= (src - 1) << GICH_LR_PHYSID_CPUID_SHIFT;
- irq->source &= ~(1 << (src - 1));
- if (irq->source) {
- irq->pending_latch = true;
- val |= GICH_LR_EOI;
- }
- }
- }
-
- /*
- * Level-triggered mapped IRQs are special because we only observe
- * rising edges as input to the VGIC. We therefore lower the line
- * level here, so that we can take new virtual IRQs. See
- * vgic_v2_fold_lr_state for more info.
- */
- if (vgic_irq_is_mapped_level(irq) && (val & GICH_LR_PENDING_BIT))
- irq->line_level = false;
-
- /* The GICv2 LR only holds five bits of priority. */
- val |= (irq->priority >> 3) << GICH_LR_PRIORITY_SHIFT;
-
- vcpu->arch.vgic_cpu.vgic_v2.vgic_lr[lr] = val;
-}
-
-void vgic_v2_clear_lr(struct kvm_vcpu *vcpu, int lr)
-{
- vcpu->arch.vgic_cpu.vgic_v2.vgic_lr[lr] = 0;
-}
-
-void vgic_v2_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
-{
- struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
- u32 vmcr;
-
- vmcr = (vmcrp->grpen0 << GICH_VMCR_ENABLE_GRP0_SHIFT) &
- GICH_VMCR_ENABLE_GRP0_MASK;
- vmcr |= (vmcrp->grpen1 << GICH_VMCR_ENABLE_GRP1_SHIFT) &
- GICH_VMCR_ENABLE_GRP1_MASK;
- vmcr |= (vmcrp->ackctl << GICH_VMCR_ACK_CTL_SHIFT) &
- GICH_VMCR_ACK_CTL_MASK;
- vmcr |= (vmcrp->fiqen << GICH_VMCR_FIQ_EN_SHIFT) &
- GICH_VMCR_FIQ_EN_MASK;
- vmcr |= (vmcrp->cbpr << GICH_VMCR_CBPR_SHIFT) &
- GICH_VMCR_CBPR_MASK;
- vmcr |= (vmcrp->eoim << GICH_VMCR_EOI_MODE_SHIFT) &
- GICH_VMCR_EOI_MODE_MASK;
- vmcr |= (vmcrp->abpr << GICH_VMCR_ALIAS_BINPOINT_SHIFT) &
- GICH_VMCR_ALIAS_BINPOINT_MASK;
- vmcr |= (vmcrp->bpr << GICH_VMCR_BINPOINT_SHIFT) &
- GICH_VMCR_BINPOINT_MASK;
- vmcr |= ((vmcrp->pmr >> GICV_PMR_PRIORITY_SHIFT) <<
- GICH_VMCR_PRIMASK_SHIFT) & GICH_VMCR_PRIMASK_MASK;
-
- cpu_if->vgic_vmcr = vmcr;
-}
-
-void vgic_v2_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
-{
- struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
- u32 vmcr;
-
- vmcr = cpu_if->vgic_vmcr;
-
- vmcrp->grpen0 = (vmcr & GICH_VMCR_ENABLE_GRP0_MASK) >>
- GICH_VMCR_ENABLE_GRP0_SHIFT;
- vmcrp->grpen1 = (vmcr & GICH_VMCR_ENABLE_GRP1_MASK) >>
- GICH_VMCR_ENABLE_GRP1_SHIFT;
- vmcrp->ackctl = (vmcr & GICH_VMCR_ACK_CTL_MASK) >>
- GICH_VMCR_ACK_CTL_SHIFT;
- vmcrp->fiqen = (vmcr & GICH_VMCR_FIQ_EN_MASK) >>
- GICH_VMCR_FIQ_EN_SHIFT;
- vmcrp->cbpr = (vmcr & GICH_VMCR_CBPR_MASK) >>
- GICH_VMCR_CBPR_SHIFT;
- vmcrp->eoim = (vmcr & GICH_VMCR_EOI_MODE_MASK) >>
- GICH_VMCR_EOI_MODE_SHIFT;
-
- vmcrp->abpr = (vmcr & GICH_VMCR_ALIAS_BINPOINT_MASK) >>
- GICH_VMCR_ALIAS_BINPOINT_SHIFT;
- vmcrp->bpr = (vmcr & GICH_VMCR_BINPOINT_MASK) >>
- GICH_VMCR_BINPOINT_SHIFT;
- vmcrp->pmr = ((vmcr & GICH_VMCR_PRIMASK_MASK) >>
- GICH_VMCR_PRIMASK_SHIFT) << GICV_PMR_PRIORITY_SHIFT;
-}
-
-void vgic_v2_enable(struct kvm_vcpu *vcpu)
-{
- /*
- * By forcing VMCR to zero, the GIC will restore the binary
- * points to their reset values. Anything else resets to zero
- * anyway.
- */
- vcpu->arch.vgic_cpu.vgic_v2.vgic_vmcr = 0;
-
- /* Get the show on the road... */
- vcpu->arch.vgic_cpu.vgic_v2.vgic_hcr = GICH_HCR_EN;
-}
-
-/* check for overlapping regions and for regions crossing the end of memory */
-static bool vgic_v2_check_base(gpa_t dist_base, gpa_t cpu_base)
-{
- if (dist_base + KVM_VGIC_V2_DIST_SIZE < dist_base)
- return false;
- if (cpu_base + KVM_VGIC_V2_CPU_SIZE < cpu_base)
- return false;
-
- if (dist_base + KVM_VGIC_V2_DIST_SIZE <= cpu_base)
- return true;
- if (cpu_base + KVM_VGIC_V2_CPU_SIZE <= dist_base)
- return true;
-
- return false;
-}
-
-int vgic_v2_map_resources(struct kvm *kvm)
-{
- struct vgic_dist *dist = &kvm->arch.vgic;
- int ret = 0;
-
- if (vgic_ready(kvm))
- goto out;
-
- if (IS_VGIC_ADDR_UNDEF(dist->vgic_dist_base) ||
- IS_VGIC_ADDR_UNDEF(dist->vgic_cpu_base)) {
- kvm_err("Need to set vgic cpu and dist addresses first\n");
- ret = -ENXIO;
- goto out;
- }
-
- if (!vgic_v2_check_base(dist->vgic_dist_base, dist->vgic_cpu_base)) {
- kvm_err("VGIC CPU and dist frames overlap\n");
- ret = -EINVAL;
- goto out;
- }
-
- /*
- * Initialize the vgic if this hasn't already been done on demand by
- * accessing the vgic state from userspace.
- */
- ret = vgic_init(kvm);
- if (ret) {
- kvm_err("Unable to initialize VGIC dynamic data structures\n");
- goto out;
- }
-
- ret = vgic_register_dist_iodev(kvm, dist->vgic_dist_base, VGIC_V2);
- if (ret) {
- kvm_err("Unable to register VGIC MMIO regions\n");
- goto out;
- }
-
- if (!static_branch_unlikely(&vgic_v2_cpuif_trap)) {
- ret = kvm_phys_addr_ioremap(kvm, dist->vgic_cpu_base,
- kvm_vgic_global_state.vcpu_base,
- KVM_VGIC_V2_CPU_SIZE, true);
- if (ret) {
- kvm_err("Unable to remap VGIC CPU to VCPU\n");
- goto out;
- }
- }
-
- dist->ready = true;
-
-out:
- return ret;
-}
-
-DEFINE_STATIC_KEY_FALSE(vgic_v2_cpuif_trap);
-
-/**
- * vgic_v2_probe - probe for a VGICv2 compatible interrupt controller
- * @info: pointer to the GIC description
- *
- * Returns 0 if the VGICv2 has been probed successfully, returns an error code
- * otherwise
- */
-int vgic_v2_probe(const struct gic_kvm_info *info)
-{
- int ret;
- u32 vtr;
-
- if (!info->vctrl.start) {
- kvm_err("GICH not present in the firmware table\n");
- return -ENXIO;
- }
-
- if (!PAGE_ALIGNED(info->vcpu.start) ||
- !PAGE_ALIGNED(resource_size(&info->vcpu))) {
- kvm_info("GICV region size/alignment is unsafe, using trapping (reduced performance)\n");
-
- ret = create_hyp_io_mappings(info->vcpu.start,
- resource_size(&info->vcpu),
- &kvm_vgic_global_state.vcpu_base_va,
- &kvm_vgic_global_state.vcpu_hyp_va);
- if (ret) {
- kvm_err("Cannot map GICV into hyp\n");
- goto out;
- }
-
- static_branch_enable(&vgic_v2_cpuif_trap);
- }
-
- ret = create_hyp_io_mappings(info->vctrl.start,
- resource_size(&info->vctrl),
- &kvm_vgic_global_state.vctrl_base,
- &kvm_vgic_global_state.vctrl_hyp);
- if (ret) {
- kvm_err("Cannot map VCTRL into hyp\n");
- goto out;
- }
-
- vtr = readl_relaxed(kvm_vgic_global_state.vctrl_base + GICH_VTR);
- kvm_vgic_global_state.nr_lr = (vtr & 0x3f) + 1;
-
- ret = kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V2);
- if (ret) {
- kvm_err("Cannot register GICv2 KVM device\n");
- goto out;
- }
-
- kvm_vgic_global_state.can_emulate_gicv2 = true;
- kvm_vgic_global_state.vcpu_base = info->vcpu.start;
- kvm_vgic_global_state.type = VGIC_V2;
- kvm_vgic_global_state.max_gic_vcpus = VGIC_V2_MAX_CPUS;
-
- kvm_debug("vgic-v2@%llx\n", info->vctrl.start);
-
- return 0;
-out:
- if (kvm_vgic_global_state.vctrl_base)
- iounmap(kvm_vgic_global_state.vctrl_base);
- if (kvm_vgic_global_state.vcpu_base_va)
- iounmap(kvm_vgic_global_state.vcpu_base_va);
-
- return ret;
-}
-
-static void save_lrs(struct kvm_vcpu *vcpu, void __iomem *base)
-{
- struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
- u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
- u64 elrsr;
- int i;
-
- elrsr = readl_relaxed(base + GICH_ELRSR0);
- if (unlikely(used_lrs > 32))
- elrsr |= ((u64)readl_relaxed(base + GICH_ELRSR1)) << 32;
-
- for (i = 0; i < used_lrs; i++) {
- if (elrsr & (1UL << i))
- cpu_if->vgic_lr[i] &= ~GICH_LR_STATE;
- else
- cpu_if->vgic_lr[i] = readl_relaxed(base + GICH_LR0 + (i * 4));
-
- writel_relaxed(0, base + GICH_LR0 + (i * 4));
- }
-}
-
-void vgic_v2_save_state(struct kvm_vcpu *vcpu)
-{
- void __iomem *base = kvm_vgic_global_state.vctrl_base;
- u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
-
- if (!base)
- return;
-
- if (used_lrs) {
- save_lrs(vcpu, base);
- writel_relaxed(0, base + GICH_HCR);
- }
-}
-
-void vgic_v2_restore_state(struct kvm_vcpu *vcpu)
-{
- struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
- void __iomem *base = kvm_vgic_global_state.vctrl_base;
- u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
- int i;
-
- if (!base)
- return;
-
- if (used_lrs) {
- writel_relaxed(cpu_if->vgic_hcr, base + GICH_HCR);
- for (i = 0; i < used_lrs; i++) {
- writel_relaxed(cpu_if->vgic_lr[i],
- base + GICH_LR0 + (i * 4));
- }
- }
-}
-
-void vgic_v2_load(struct kvm_vcpu *vcpu)
-{
- struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
-
- writel_relaxed(cpu_if->vgic_vmcr,
- kvm_vgic_global_state.vctrl_base + GICH_VMCR);
- writel_relaxed(cpu_if->vgic_apr,
- kvm_vgic_global_state.vctrl_base + GICH_APR);
-}
-
-void vgic_v2_vmcr_sync(struct kvm_vcpu *vcpu)
-{
- struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
-
- cpu_if->vgic_vmcr = readl_relaxed(kvm_vgic_global_state.vctrl_base + GICH_VMCR);
-}
-
-void vgic_v2_put(struct kvm_vcpu *vcpu)
-{
- struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
-
- vgic_v2_vmcr_sync(vcpu);
- cpu_if->vgic_apr = readl_relaxed(kvm_vgic_global_state.vctrl_base + GICH_APR);
-}