virt/kvm/arm/vgic/vgic-v2.c - kernel/msm-4.19 - Gitiles

 /*
  * Copyright (C) 2015, 2016 ARM Ltd.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */

 #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"

 /*
  * Call this function to convert a u64 value to an unsigned long * bitmask
  * in a way that works on both 32-bit and 64-bit LE and BE platforms.
  *
  * Warning: Calling this function may modify *val.
  */
 static unsigned long *u64_to_bitmask(u64 *val)
 {
 #if defined(CONFIG_CPU_BIG_ENDIAN) && BITS_PER_LONG == 32
 	*val = (*val >> 32) | (*val << 32);
 #endif
 	return (unsigned long *)val;
 }

 void vgic_v2_process_maintenance(struct kvm_vcpu *vcpu)
 {
 	struct vgic_v2_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v2;

 	if (cpuif->vgic_misr & GICH_MISR_EOI) {
 		u64 eisr = cpuif->vgic_eisr;
 		unsigned long *eisr_bmap = u64_to_bitmask(&eisr);
 		int lr;

 		for_each_set_bit(lr, eisr_bmap, kvm_vgic_global_state.nr_lr) {
 			u32 intid = cpuif->vgic_lr[lr] & GICH_LR_VIRTUALID;

 			WARN_ON(cpuif->vgic_lr[lr] & GICH_LR_STATE);

 			kvm_notify_acked_irq(vcpu->kvm, 0,
 					     intid - VGIC_NR_PRIVATE_IRQS);
 		}
 	}

 	/* check and disable underflow maintenance IRQ */
 	cpuif->vgic_hcr &= ~GICH_HCR_UIE;

 	/*
 	 * In the next iterations of the vcpu loop, if we sync the
 	 * vgic state after flushing it, but before entering the guest
 	 * (this happens for pending signals and vmid rollovers), then
 	 * make sure we don't pick up any old maintenance interrupts
 	 * here.
 	 */
 	cpuif->vgic_eisr = 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;
 }

 /*
  * 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_v2_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v2;
 	int lr;

 	for (lr = 0; lr < vcpu->arch.vgic_cpu.used_lrs; lr++) {
 		u32 val = cpuif->vgic_lr[lr];
 		u32 intid = val & GICH_LR_VIRTUALID;
 		struct vgic_irq *irq;

 		irq = vgic_get_irq(vcpu->kvm, vcpu, intid);

 		spin_lock(&irq->irq_lock);

 		/* Always preserve the active bit */
 		irq->active = !!(val & GICH_LR_ACTIVE_BIT);

 		/* Edge is the only case where we preserve the pending bit */
 		if (irq->config == VGIC_CONFIG_EDGE &&
 		    (val & GICH_LR_PENDING_BIT)) {
 			irq->pending = true;

 			if (vgic_irq_is_sgi(intid)) {
 				u32 cpuid = val & GICH_LR_PHYSID_CPUID;

 				cpuid >>= GICH_LR_PHYSID_CPUID_SHIFT;
 				irq->source |= (1 << cpuid);
 			}
 		}

 		/*
 		 * Clear soft pending state when level irqs have been acked.
 		 * Always regenerate the pending state.
 		 */
 		if (irq->config == VGIC_CONFIG_LEVEL) {
 			if (!(val & GICH_LR_PENDING_BIT))
 				irq->soft_pending = false;

 			irq->pending = irq->line_level || irq->soft_pending;
 		}

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

 /*
  * 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;

 	if (irq->pending) {
 		val |= GICH_LR_PENDING_BIT;

 		if (irq->config == VGIC_CONFIG_EDGE)
 			irq->pending = false;

 		if (vgic_irq_is_sgi(irq->intid)) {
 			u32 src = ffs(irq->source);

 			BUG_ON(!src);
 			val |= (src - 1) << GICH_LR_PHYSID_CPUID_SHIFT;
 			irq->source &= ~(1 << (src - 1));
 			if (irq->source)
 				irq->pending = true;
 		}
 	}

 	if (irq->active)
 		val |= GICH_LR_ACTIVE_BIT;

 	if (irq->hw) {
 		val |= GICH_LR_HW;
 		val |= irq->hwintid << GICH_LR_PHYSID_CPUID_SHIFT;
 	} else {
 		if (irq->config == VGIC_CONFIG_LEVEL)
 			val |= GICH_LR_EOI;
 	}

 	/* 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)
 {
 	u32 vmcr;

 	vmcr  = (vmcrp->ctlr << GICH_VMCR_CTRL_SHIFT) & GICH_VMCR_CTRL_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 << GICH_VMCR_PRIMASK_SHIFT) &
 		GICH_VMCR_PRIMASK_MASK;

 	vcpu->arch.vgic_cpu.vgic_v2.vgic_vmcr = vmcr;
 }

 void vgic_v2_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
 {
 	u32 vmcr = vcpu->arch.vgic_cpu.vgic_v2.vgic_vmcr;

 	vmcrp->ctlr = (vmcr & GICH_VMCR_CTRL_MASK) >>
 			GICH_VMCR_CTRL_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;
 }

 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;
 	vcpu->arch.vgic_cpu.vgic_v2.vgic_elrsr = ~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:
 	if (ret)
 		kvm_vgic_destroy(kvm);
 	return ret;
 }

 DEFINE_STATIC_KEY_FALSE(vgic_v2_cpuif_trap);

 /**
  * vgic_v2_probe - probe for a GICv2 compatible interrupt controller in DT
  * @node:	pointer to the DT node
  *
  * Returns 0 if a GICv2 has been found, 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");
 		kvm_vgic_global_state.vcpu_base_va = ioremap(info->vcpu.start,
 							     resource_size(&info->vcpu));
 		if (!kvm_vgic_global_state.vcpu_base_va) {
 			kvm_err("Cannot ioremap GICV\n");
 			return -ENOMEM;
 		}

 		ret = create_hyp_io_mappings(kvm_vgic_global_state.vcpu_base_va,
 					     kvm_vgic_global_state.vcpu_base_va + resource_size(&info->vcpu),
 					     info->vcpu.start);
 		if (ret) {
 			kvm_err("Cannot map GICV into hyp\n");
 			goto out;
 		}

 		static_branch_enable(&vgic_v2_cpuif_trap);
 	}

 	kvm_vgic_global_state.vctrl_base = ioremap(info->vctrl.start,
 						   resource_size(&info->vctrl));
 	if (!kvm_vgic_global_state.vctrl_base) {
 		kvm_err("Cannot ioremap GICH\n");
 		ret = -ENOMEM;
 		goto out;
 	}

 	vtr = readl_relaxed(kvm_vgic_global_state.vctrl_base + GICH_VTR);
 	kvm_vgic_global_state.nr_lr = (vtr & 0x3f) + 1;

 	ret = create_hyp_io_mappings(kvm_vgic_global_state.vctrl_base,
 				     kvm_vgic_global_state.vctrl_base +
 					 resource_size(&info->vctrl),
 				     info->vctrl.start);
 	if (ret) {
 		kvm_err("Cannot map VCTRL into hyp\n");
 		goto out;
 	}

 	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_info("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;
 }
	/*
	* Copyright (C) 2015, 2016 ARM Ltd.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	#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"

	/*
	* Call this function to convert a u64 value to an unsigned long * bitmask
	* in a way that works on both 32-bit and 64-bit LE and BE platforms.
	*
	* Warning: Calling this function may modify *val.
	*/
	static unsigned long u64_to_bitmask(u64 val)
	{
	#if defined(CONFIG_CPU_BIG_ENDIAN) && BITS_PER_LONG == 32
	val = (val >> 32) \| (*val << 32);
	#endif
	return (unsigned long *)val;
	}

	void vgic_v2_process_maintenance(struct kvm_vcpu *vcpu)
	{
	struct vgic_v2_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v2;

	if (cpuif->vgic_misr & GICH_MISR_EOI) {
	u64 eisr = cpuif->vgic_eisr;
	unsigned long *eisr_bmap = u64_to_bitmask(&eisr);
	int lr;

	for_each_set_bit(lr, eisr_bmap, kvm_vgic_global_state.nr_lr) {
	u32 intid = cpuif->vgic_lr[lr] & GICH_LR_VIRTUALID;

	WARN_ON(cpuif->vgic_lr[lr] & GICH_LR_STATE);

	kvm_notify_acked_irq(vcpu->kvm, 0,
	intid - VGIC_NR_PRIVATE_IRQS);
	}
	}

	/* check and disable underflow maintenance IRQ */
	cpuif->vgic_hcr &= ~GICH_HCR_UIE;

	/*
	* In the next iterations of the vcpu loop, if we sync the
	* vgic state after flushing it, but before entering the guest
	* (this happens for pending signals and vmid rollovers), then
	* make sure we don't pick up any old maintenance interrupts
	* here.
	*/
	cpuif->vgic_eisr = 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;
	}

	/*
	* 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_v2_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v2;
	int lr;

	for (lr = 0; lr < vcpu->arch.vgic_cpu.used_lrs; lr++) {
	u32 val = cpuif->vgic_lr[lr];
	u32 intid = val & GICH_LR_VIRTUALID;
	struct vgic_irq *irq;

	irq = vgic_get_irq(vcpu->kvm, vcpu, intid);

	spin_lock(&irq->irq_lock);

	/* Always preserve the active bit */
	irq->active = !!(val & GICH_LR_ACTIVE_BIT);

	/* Edge is the only case where we preserve the pending bit */
	if (irq->config == VGIC_CONFIG_EDGE &&
	(val & GICH_LR_PENDING_BIT)) {
	irq->pending = true;

	if (vgic_irq_is_sgi(intid)) {
	u32 cpuid = val & GICH_LR_PHYSID_CPUID;

	cpuid >>= GICH_LR_PHYSID_CPUID_SHIFT;
	irq->source \|= (1 << cpuid);
	}
	}

	/*
	* Clear soft pending state when level irqs have been acked.
	* Always regenerate the pending state.
	*/
	if (irq->config == VGIC_CONFIG_LEVEL) {
	if (!(val & GICH_LR_PENDING_BIT))
	irq->soft_pending = false;

	irq->pending = irq->line_level \|\| irq->soft_pending;
	}

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

	/*
	* 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;

	if (irq->pending) {
	val \|= GICH_LR_PENDING_BIT;

	if (irq->config == VGIC_CONFIG_EDGE)
	irq->pending = false;

	if (vgic_irq_is_sgi(irq->intid)) {
	u32 src = ffs(irq->source);

	BUG_ON(!src);
	val \|= (src - 1) << GICH_LR_PHYSID_CPUID_SHIFT;
	irq->source &= ~(1 << (src - 1));
	if (irq->source)
	irq->pending = true;
	}
	}

	if (irq->active)
	val \|= GICH_LR_ACTIVE_BIT;

	if (irq->hw) {
	val \|= GICH_LR_HW;
	val \|= irq->hwintid << GICH_LR_PHYSID_CPUID_SHIFT;
	} else {
	if (irq->config == VGIC_CONFIG_LEVEL)
	val \|= GICH_LR_EOI;
	}

	/* 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)
	{
	u32 vmcr;

	vmcr = (vmcrp->ctlr << GICH_VMCR_CTRL_SHIFT) & GICH_VMCR_CTRL_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 << GICH_VMCR_PRIMASK_SHIFT) &
	GICH_VMCR_PRIMASK_MASK;

	vcpu->arch.vgic_cpu.vgic_v2.vgic_vmcr = vmcr;
	}

	void vgic_v2_get_vmcr(struct kvm_vcpu vcpu, struct vgic_vmcr vmcrp)
	{
	u32 vmcr = vcpu->arch.vgic_cpu.vgic_v2.vgic_vmcr;

	vmcrp->ctlr = (vmcr & GICH_VMCR_CTRL_MASK) >>
	GICH_VMCR_CTRL_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;
	}

	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;
	vcpu->arch.vgic_cpu.vgic_v2.vgic_elrsr = ~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:
	if (ret)
	kvm_vgic_destroy(kvm);
	return ret;
	}

	DEFINE_STATIC_KEY_FALSE(vgic_v2_cpuif_trap);

	/**
	* vgic_v2_probe - probe for a GICv2 compatible interrupt controller in DT
	* @node: pointer to the DT node
	*
	* Returns 0 if a GICv2 has been found, 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");
	kvm_vgic_global_state.vcpu_base_va = ioremap(info->vcpu.start,
	resource_size(&info->vcpu));
	if (!kvm_vgic_global_state.vcpu_base_va) {
	kvm_err("Cannot ioremap GICV\n");
	return -ENOMEM;
	}

	ret = create_hyp_io_mappings(kvm_vgic_global_state.vcpu_base_va,
	kvm_vgic_global_state.vcpu_base_va + resource_size(&info->vcpu),
	info->vcpu.start);
	if (ret) {
	kvm_err("Cannot map GICV into hyp\n");
	goto out;
	}

	static_branch_enable(&vgic_v2_cpuif_trap);
	}

	kvm_vgic_global_state.vctrl_base = ioremap(info->vctrl.start,
	resource_size(&info->vctrl));
	if (!kvm_vgic_global_state.vctrl_base) {
	kvm_err("Cannot ioremap GICH\n");
	ret = -ENOMEM;
	goto out;
	}

	vtr = readl_relaxed(kvm_vgic_global_state.vctrl_base + GICH_VTR);
	kvm_vgic_global_state.nr_lr = (vtr & 0x3f) + 1;

	ret = create_hyp_io_mappings(kvm_vgic_global_state.vctrl_base,
	kvm_vgic_global_state.vctrl_base +
	resource_size(&info->vctrl),
	info->vctrl.start);
	if (ret) {
	kvm_err("Cannot map VCTRL into hyp\n");
	goto out;
	}

	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_info("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;
	}