arch/arm64/kvm/vgic/vgic-v2.c - linux - Git at Google

 // 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->vgic_v2.used_lrs; lr++) {
 		u32 val = cpuif->vgic_lr[lr];
 		u32 cpuid, intid = val & GICH_LR_VIRTUALID;
 		struct vgic_irq *irq;
 		bool deactivated;

 		/* 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, note deactivation */
 		deactivated = irq->active && !(val & GICH_LR_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;

 		/* Handle resampling for mapped interrupts if required */
 		vgic_irq_handle_resampling(irq, deactivated, val & GICH_LR_PENDING_BIT);

 		raw_spin_unlock(&irq->irq_lock);
 		vgic_put_irq(vcpu->kvm, irq);
 	}

 	cpuif->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 && !vgic_irq_needs_resampling(irq)) {
 		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 (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");
 		return -ENXIO;
 	}

 	if (!vgic_v2_check_base(dist->vgic_dist_base, dist->vgic_cpu_base)) {
 		kvm_err("VGIC CPU and dist frames overlap\n");
 		return -EINVAL;
 	}

 	/*
 	 * 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");
 		return ret;
 	}

 	ret = vgic_register_dist_iodev(kvm, dist->vgic_dist_base, VGIC_V2);
 	if (ret) {
 		kvm_err("Unable to register VGIC MMIO regions\n");
 		return ret;
 	}

 	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");
 			return ret;
 		}
 	}

 	return 0;
 }

 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 = cpu_if->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.vgic_v2.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 = cpu_if->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);
 }
	// 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->vgic_v2.used_lrs; lr++) {
	u32 val = cpuif->vgic_lr[lr];
	u32 cpuid, intid = val & GICH_LR_VIRTUALID;
	struct vgic_irq *irq;
	bool deactivated;

	/* 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, note deactivation */
	deactivated = irq->active && !(val & GICH_LR_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;

	/* Handle resampling for mapped interrupts if required */
	vgic_irq_handle_resampling(irq, deactivated, val & GICH_LR_PENDING_BIT);

	raw_spin_unlock(&irq->irq_lock);
	vgic_put_irq(vcpu->kvm, irq);
	}

	cpuif->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 && !vgic_irq_needs_resampling(irq)) {
	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 (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");
	return -ENXIO;
	}

	if (!vgic_v2_check_base(dist->vgic_dist_base, dist->vgic_cpu_base)) {
	kvm_err("VGIC CPU and dist frames overlap\n");
	return -EINVAL;
	}

	/*
	* 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");
	return ret;
	}

	ret = vgic_register_dist_iodev(kvm, dist->vgic_dist_base, VGIC_V2);
	if (ret) {
	kvm_err("Unable to register VGIC MMIO regions\n");
	return ret;
	}

	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");
	return ret;
	}
	}

	return 0;
	}

	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 = cpu_if->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.vgic_v2.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 = cpu_if->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);
	}