Merge branch kvm-arm64/m1 into kvmarm-master/next

Rework the KVM GIC and timer to cope with lesser HW such as
the Apple M1 SoC.

* kvm-arm64/m1:
  irqchip/apple-aic: Advertise some level of vGICv3 compatibility
  KVM: arm64: timer: Add support for SW-based deactivation
  KVM: arm64: timer: Refactor IRQ configuration
  KVM: arm64: vgic: Implement SW-driven deactivation
  KVM: arm64: vgic: move irq->get_input_level into an ops structure
  KVM: arm64: vgic: Let an interrupt controller advertise lack of HW deactivation
  KVM: arm64: vgic: Be tolerant to the lack of maintenance interrupt masking
  KVM: arm64: Handle physical FIQ as an IRQ while running a guest
  irqchip/gic: Split vGIC probing information from the GIC code

arch/arm64/kvm/arch_timer.c

@@ -9,6 +9,7 @@
 #include <linux/kvm_host.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
+#include <linux/irqdomain.h>
 #include <linux/uaccess.h>
 
 #include <clocksource/arm_arch_timer.h>
@@ -973,36 +974,154 @@ static int kvm_timer_dying_cpu(unsigned int cpu)
 	return 0;
 }
 
-int kvm_timer_hyp_init(bool has_gic)
+static int timer_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
 {
-	struct arch_timer_kvm_info *info;
-	int err;
+	if (vcpu)
+		irqd_set_forwarded_to_vcpu(d);
+	else
+		irqd_clr_forwarded_to_vcpu(d);
 
-	info = arch_timer_get_kvm_info();
-	timecounter = &info->timecounter;
+	return 0;
+}
 
-	if (!timecounter->cc) {
-		kvm_err("kvm_arch_timer: uninitialized timecounter\n");
-		return -ENODEV;
+static int timer_irq_set_irqchip_state(struct irq_data *d,
+				       enum irqchip_irq_state which, bool val)
+{
+	if (which != IRQCHIP_STATE_ACTIVE || !irqd_is_forwarded_to_vcpu(d))
+		return irq_chip_set_parent_state(d, which, val);
+
+	if (val)
+		irq_chip_mask_parent(d);
+	else
+		irq_chip_unmask_parent(d);
+
+	return 0;
+}
+
+static void timer_irq_eoi(struct irq_data *d)
+{
+	if (!irqd_is_forwarded_to_vcpu(d))
+		irq_chip_eoi_parent(d);
+}
+
+static void timer_irq_ack(struct irq_data *d)
+{
+	d = d->parent_data;
+	if (d->chip->irq_ack)
+		d->chip->irq_ack(d);
+}
+
+static struct irq_chip timer_chip = {
+	.name			= "KVM",
+	.irq_ack		= timer_irq_ack,
+	.irq_mask		= irq_chip_mask_parent,
+	.irq_unmask		= irq_chip_unmask_parent,
+	.irq_eoi		= timer_irq_eoi,
+	.irq_set_type		= irq_chip_set_type_parent,
+	.irq_set_vcpu_affinity	= timer_irq_set_vcpu_affinity,
+	.irq_set_irqchip_state	= timer_irq_set_irqchip_state,
+};
+
+static int timer_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
+				  unsigned int nr_irqs, void *arg)
+{
+	irq_hw_number_t hwirq = (uintptr_t)arg;
+
+	return irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
+					     &timer_chip, NULL);
+}
+
+static void timer_irq_domain_free(struct irq_domain *domain, unsigned int virq,
+				  unsigned int nr_irqs)
+{
+}
+
+static const struct irq_domain_ops timer_domain_ops = {
+	.alloc	= timer_irq_domain_alloc,
+	.free	= timer_irq_domain_free,
+};
+
+static struct irq_ops arch_timer_irq_ops = {
+	.get_input_level = kvm_arch_timer_get_input_level,
+};
+
+static void kvm_irq_fixup_flags(unsigned int virq, u32 *flags)
+{
+	*flags = irq_get_trigger_type(virq);
+	if (*flags != IRQF_TRIGGER_HIGH && *flags != IRQF_TRIGGER_LOW) {
+		kvm_err("Invalid trigger for timer IRQ%d, assuming level low\n",
+			virq);
+		*flags = IRQF_TRIGGER_LOW;
 	}
+}
 
-	/* First, do the virtual EL1 timer irq */
+static int kvm_irq_init(struct arch_timer_kvm_info *info)
+{
+	struct irq_domain *domain = NULL;
 
 	if (info->virtual_irq <= 0) {
 		kvm_err("kvm_arch_timer: invalid virtual timer IRQ: %d\n",
 			info->virtual_irq);
 		return -ENODEV;
 	}
+
 	host_vtimer_irq = info->virtual_irq;
+	kvm_irq_fixup_flags(host_vtimer_irq, &host_vtimer_irq_flags);
+
+	if (kvm_vgic_global_state.no_hw_deactivation) {
+		struct fwnode_handle *fwnode;
+		struct irq_data *data;
+
+		fwnode = irq_domain_alloc_named_fwnode("kvm-timer");
+		if (!fwnode)
+			return -ENOMEM;
+
+		/* Assume both vtimer and ptimer in the same parent */
+		data = irq_get_irq_data(host_vtimer_irq);
+		domain = irq_domain_create_hierarchy(data->domain, 0,
+						     NR_KVM_TIMERS, fwnode,
+						     &timer_domain_ops, NULL);
+		if (!domain) {
+			irq_domain_free_fwnode(fwnode);
+			return -ENOMEM;
+		}
+
+		arch_timer_irq_ops.flags |= VGIC_IRQ_SW_RESAMPLE;
+		WARN_ON(irq_domain_push_irq(domain, host_vtimer_irq,
+					    (void *)TIMER_VTIMER));
+	}
 
-	host_vtimer_irq_flags = irq_get_trigger_type(host_vtimer_irq);
-	if (host_vtimer_irq_flags != IRQF_TRIGGER_HIGH &&
-	    host_vtimer_irq_flags != IRQF_TRIGGER_LOW) {
-		kvm_err("Invalid trigger for vtimer IRQ%d, assuming level low\n",
-			host_vtimer_irq);
-		host_vtimer_irq_flags = IRQF_TRIGGER_LOW;
+	if (info->physical_irq > 0) {
+		host_ptimer_irq = info->physical_irq;
+		kvm_irq_fixup_flags(host_ptimer_irq, &host_ptimer_irq_flags);
+
+		if (domain)
+			WARN_ON(irq_domain_push_irq(domain, host_ptimer_irq,
+						    (void *)TIMER_PTIMER));
 	}
 
+	return 0;
+}
+
+int kvm_timer_hyp_init(bool has_gic)
+{
+	struct arch_timer_kvm_info *info;
+	int err;
+
+	info = arch_timer_get_kvm_info();
+	timecounter = &info->timecounter;
+
+	if (!timecounter->cc) {
+		kvm_err("kvm_arch_timer: uninitialized timecounter\n");
+		return -ENODEV;
+	}
+
+	err = kvm_irq_init(info);
+	if (err)
+		return err;
+
+	/* First, do the virtual EL1 timer irq */
+
 	err = request_percpu_irq(host_vtimer_irq, kvm_arch_timer_handler,
 				 "kvm guest vtimer", kvm_get_running_vcpus());
 	if (err) {
@@ -1027,15 +1146,6 @@ int kvm_timer_hyp_init(bool has_gic)
 	/* Now let's do the physical EL1 timer irq */
 
 	if (info->physical_irq > 0) {
-		host_ptimer_irq = info->physical_irq;
-		host_ptimer_irq_flags = irq_get_trigger_type(host_ptimer_irq);
-		if (host_ptimer_irq_flags != IRQF_TRIGGER_HIGH &&
-		    host_ptimer_irq_flags != IRQF_TRIGGER_LOW) {
-			kvm_err("Invalid trigger for ptimer IRQ%d, assuming level low\n",
-				host_ptimer_irq);
-			host_ptimer_irq_flags = IRQF_TRIGGER_LOW;
-		}
-
 		err = request_percpu_irq(host_ptimer_irq, kvm_arch_timer_handler,
 					 "kvm guest ptimer", kvm_get_running_vcpus());
 		if (err) {
@@ -1143,7 +1253,7 @@ int kvm_timer_enable(struct kvm_vcpu *vcpu)
 	ret = kvm_vgic_map_phys_irq(vcpu,
 				    map.direct_vtimer->host_timer_irq,
 				    map.direct_vtimer->irq.irq,
-				    kvm_arch_timer_get_input_level);
+				    &arch_timer_irq_ops);
 	if (ret)
 		return ret;
 
@@ -1151,7 +1261,7 @@ int kvm_timer_enable(struct kvm_vcpu *vcpu)
 		ret = kvm_vgic_map_phys_irq(vcpu,
 					    map.direct_ptimer->host_timer_irq,
 					    map.direct_ptimer->irq.irq,
-					    kvm_arch_timer_get_input_level);
+					    &arch_timer_irq_ops);
 	}
 
 	if (ret)

arch/arm64/kvm/hyp/hyp-entry.S

@@ -76,6 +76,7 @@ el1_trap:
 	b	__guest_exit
 
 el1_irq:
+el1_fiq:
 	get_vcpu_ptr	x1, x0
 	mov	x0, #ARM_EXCEPTION_IRQ
 	b	__guest_exit
@@ -131,7 +132,6 @@ SYM_CODE_END(\label)
 	invalid_vector	el2t_error_invalid
 	invalid_vector	el2h_irq_invalid
 	invalid_vector	el2h_fiq_invalid
-	invalid_vector	el1_fiq_invalid
 
 	.ltorg
 
@@ -179,12 +179,12 @@ SYM_CODE_START(__kvm_hyp_vector)
 
 	valid_vect	el1_sync		// Synchronous 64-bit EL1
 	valid_vect	el1_irq			// IRQ 64-bit EL1
-	invalid_vect	el1_fiq_invalid		// FIQ 64-bit EL1
+	valid_vect	el1_fiq			// FIQ 64-bit EL1
 	valid_vect	el1_error		// Error 64-bit EL1
 
 	valid_vect	el1_sync		// Synchronous 32-bit EL1
 	valid_vect	el1_irq			// IRQ 32-bit EL1
-	invalid_vect	el1_fiq_invalid		// FIQ 32-bit EL1
+	valid_vect	el1_fiq			// FIQ 32-bit EL1
 	valid_vect	el1_error		// Error 32-bit EL1
 SYM_CODE_END(__kvm_hyp_vector)
 

arch/arm64/kvm/vgic/vgic-init.c

@@ -482,6 +482,16 @@ static irqreturn_t vgic_maintenance_handler(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+static struct gic_kvm_info *gic_kvm_info;
+
+void __init vgic_set_kvm_info(const struct gic_kvm_info *info)
+{
+	BUG_ON(gic_kvm_info != NULL);
+	gic_kvm_info = kmalloc(sizeof(*info), GFP_KERNEL);
+	if (gic_kvm_info)
+		*gic_kvm_info = *info;
+}
+
 /**
  * kvm_vgic_init_cpu_hardware - initialize the GIC VE hardware
  *
@@ -509,18 +519,29 @@ void kvm_vgic_init_cpu_hardware(void)
  */
 int kvm_vgic_hyp_init(void)
 {
-	const struct gic_kvm_info *gic_kvm_info;
+	bool has_mask;
 	int ret;
 
-	gic_kvm_info = gic_get_kvm_info();
 	if (!gic_kvm_info)
 		return -ENODEV;
 
-	if (!gic_kvm_info->maint_irq) {
+	has_mask = !gic_kvm_info->no_maint_irq_mask;
+
+	if (has_mask && !gic_kvm_info->maint_irq) {
 		kvm_err("No vgic maintenance irq\n");
 		return -ENXIO;
 	}
 
+	/*
+	 * If we get one of these oddball non-GICs, taint the kernel,
+	 * as we have no idea of how they *really* behave.
+	 */
+	if (gic_kvm_info->no_hw_deactivation) {
+		kvm_info("Non-architectural vgic, tainting kernel\n");
+		add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK);
+		kvm_vgic_global_state.no_hw_deactivation = true;
+	}
+
 	switch (gic_kvm_info->type) {
 	case GIC_V2:
 		ret = vgic_v2_probe(gic_kvm_info);
@@ -536,10 +557,17 @@ int kvm_vgic_hyp_init(void)
 		ret = -ENODEV;
 	}
 
+	kvm_vgic_global_state.maint_irq = gic_kvm_info->maint_irq;
+
+	kfree(gic_kvm_info);
+	gic_kvm_info = NULL;
+
 	if (ret)
 		return ret;
 
-	kvm_vgic_global_state.maint_irq = gic_kvm_info->maint_irq;
+	if (!has_mask)
+		return 0;
+
 	ret = request_percpu_irq(kvm_vgic_global_state.maint_irq,
 				 vgic_maintenance_handler,
 				 "vgic", kvm_get_running_vcpus());

arch/arm64/kvm/vgic/vgic-v2.c

@@ -108,11 +108,22 @@ void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu)
 		 * 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.
+		 *
+		 * Another case is when the interrupt requires a helping hand
+		 * on deactivation (no HW deactivation, for example).
 		 */
-		if (vgic_irq_is_mapped_level(irq) && (val & GICH_LR_PENDING_BIT)) {
-			irq->line_level = vgic_get_phys_line_level(irq);
+		if (vgic_irq_is_mapped_level(irq)) {
+			bool resample = false;
+
+			if (val & GICH_LR_PENDING_BIT) {
+				irq->line_level = vgic_get_phys_line_level(irq);
+				resample = !irq->line_level;
+			} else if (vgic_irq_needs_resampling(irq) &&
+				   !(irq->active || irq->pending_latch)) {
+				resample = true;
+			}
 
-			if (!irq->line_level)
+			if (resample)
 				vgic_irq_set_phys_active(irq, false);
 		}
 
@@ -152,7 +163,7 @@ void vgic_v2_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr)
 	if (irq->group)
 		val |= GICH_LR_GROUP1;
 
-	if (irq->hw) {
+	if (irq->hw && !vgic_irq_needs_resampling(irq)) {
 		val |= GICH_LR_HW;
 		val |= irq->hwintid << GICH_LR_PHYSID_CPUID_SHIFT;
 		/*

arch/arm64/kvm/vgic/vgic-v3.c

@@ -101,11 +101,22 @@ void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu)
 		 * 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.
+		 *
+		 * Another case is when the interrupt requires a helping hand
+		 * on deactivation (no HW deactivation, for example).
 		 */
-		if (vgic_irq_is_mapped_level(irq) && (val & ICH_LR_PENDING_BIT)) {
-			irq->line_level = vgic_get_phys_line_level(irq);
+		if (vgic_irq_is_mapped_level(irq)) {
+			bool resample = false;
+
+			if (val & ICH_LR_PENDING_BIT) {
+				irq->line_level = vgic_get_phys_line_level(irq);
+				resample = !irq->line_level;
+			} else if (vgic_irq_needs_resampling(irq) &&
+				   !(irq->active || irq->pending_latch)) {
+				resample = true;
+			}
 
-			if (!irq->line_level)
+			if (resample)
 				vgic_irq_set_phys_active(irq, false);
 		}
 
@@ -136,7 +147,7 @@ void vgic_v3_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr)
 		}
 	}
 
-	if (irq->hw) {
+	if (irq->hw && !vgic_irq_needs_resampling(irq)) {
 		val |= ICH_LR_HW;
 		val |= ((u64)irq->hwintid) << ICH_LR_PHYS_ID_SHIFT;
 		/*

arch/arm64/kvm/vgic/vgic.c

@@ -182,8 +182,8 @@ bool vgic_get_phys_line_level(struct vgic_irq *irq)
 
 	BUG_ON(!irq->hw);
 
-	if (irq->get_input_level)
-		return irq->get_input_level(irq->intid);
+	if (irq->ops && irq->ops->get_input_level)
+		return irq->ops->get_input_level(irq->intid);
 
 	WARN_ON(irq_get_irqchip_state(irq->host_irq,
 				      IRQCHIP_STATE_PENDING,
@@ -480,7 +480,7 @@ int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
 /* @irq->irq_lock must be held */
 static int kvm_vgic_map_irq(struct kvm_vcpu *vcpu, struct vgic_irq *irq,
 			    unsigned int host_irq,
-			    bool (*get_input_level)(int vindid))
+			    struct irq_ops *ops)
 {
 	struct irq_desc *desc;
 	struct irq_data *data;
@@ -500,7 +500,7 @@ static int kvm_vgic_map_irq(struct kvm_vcpu *vcpu, struct vgic_irq *irq,
 	irq->hw = true;
 	irq->host_irq = host_irq;
 	irq->hwintid = data->hwirq;
-	irq->get_input_level = get_input_level;
+	irq->ops = ops;
 	return 0;
 }
 
@@ -509,11 +509,11 @@ static inline void kvm_vgic_unmap_irq(struct vgic_irq *irq)
 {
 	irq->hw = false;
 	irq->hwintid = 0;
-	irq->get_input_level = NULL;
+	irq->ops = NULL;
 }
 
 int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq,
-			  u32 vintid, bool (*get_input_level)(int vindid))
+			  u32 vintid, struct irq_ops *ops)
 {
 	struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
 	unsigned long flags;
@@ -522,7 +522,7 @@ int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq,
 	BUG_ON(!irq);
 
 	raw_spin_lock_irqsave(&irq->irq_lock, flags);
-	ret = kvm_vgic_map_irq(vcpu, irq, host_irq, get_input_level);
+	ret = kvm_vgic_map_irq(vcpu, irq, host_irq, ops);
 	raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
 	vgic_put_irq(vcpu->kvm, irq);
 

drivers/irqchip/irq-apple-aic.c

@@ -50,6 +50,7 @@
 #include <linux/cpuhotplug.h>
 #include <linux/io.h>
 #include <linux/irqchip.h>
+#include <linux/irqchip/arm-vgic-info.h>
 #include <linux/irqdomain.h>
 #include <linux/limits.h>
 #include <linux/of_address.h>
@@ -787,6 +788,12 @@ static int aic_init_cpu(unsigned int cpu)
 	return 0;
 }
 
+static struct gic_kvm_info vgic_info __initdata = {
+	.type			= GIC_V3,
+	.no_maint_irq_mask	= true,
+	.no_hw_deactivation	= true,
+};
+
 static int __init aic_of_ic_init(struct device_node *node, struct device_node *parent)
 {
 	int i;
@@ -843,6 +850,8 @@ static int __init aic_of_ic_init(struct device_node *node, struct device_node *p
 			  "irqchip/apple-aic/ipi:starting",
 			  aic_init_cpu, NULL);
 
+	vgic_set_kvm_info(&vgic_info);
+
 	pr_info("Initialized with %d IRQs, %d FIQs, %d vIPIs\n",
 		irqc->nr_hw, AIC_NR_FIQ, AIC_NR_SWIPI);
 

drivers/irqchip/irq-gic-common.c

@@ -12,19 +12,6 @@
 
 static DEFINE_RAW_SPINLOCK(irq_controller_lock);
 
-static const struct gic_kvm_info *gic_kvm_info;
-
-const struct gic_kvm_info *gic_get_kvm_info(void)
-{
-	return gic_kvm_info;
-}
-
-void gic_set_kvm_info(const struct gic_kvm_info *info)
-{
-	BUG_ON(gic_kvm_info != NULL);
-	gic_kvm_info = info;
-}
-
 void gic_enable_of_quirks(const struct device_node *np,
 			  const struct gic_quirk *quirks, void *data)
 {

drivers/irqchip/irq-gic-common.h

@@ -28,6 +28,4 @@ void gic_enable_quirks(u32 iidr, const struct gic_quirk *quirks,
 void gic_enable_of_quirks(const struct device_node *np,
 			  const struct gic_quirk *quirks, void *data);
 
-void gic_set_kvm_info(const struct gic_kvm_info *info);
-
 #endif /* _IRQ_GIC_COMMON_H */

drivers/irqchip/irq-gic-v3.c

@@ -103,7 +103,7 @@ EXPORT_SYMBOL(gic_nonsecure_priorities);
 /* ppi_nmi_refs[n] == number of cpus having ppi[n + 16] set as NMI */
 static refcount_t *ppi_nmi_refs;
 
-static struct gic_kvm_info gic_v3_kvm_info;
+static struct gic_kvm_info gic_v3_kvm_info __initdata;
 static DEFINE_PER_CPU(bool, has_rss);
 
 #define MPIDR_RS(mpidr)			(((mpidr) & 0xF0UL) >> 4)
@@ -1852,7 +1852,7 @@ static void __init gic_of_setup_kvm_info(struct device_node *node)
 
 	gic_v3_kvm_info.has_v4 = gic_data.rdists.has_vlpis;
 	gic_v3_kvm_info.has_v4_1 = gic_data.rdists.has_rvpeid;
-	gic_set_kvm_info(&gic_v3_kvm_info);
+	vgic_set_kvm_info(&gic_v3_kvm_info);
 }
 
 static int __init gic_of_init(struct device_node *node, struct device_node *parent)
@@ -2168,7 +2168,7 @@ static void __init gic_acpi_setup_kvm_info(void)
 
 	gic_v3_kvm_info.has_v4 = gic_data.rdists.has_vlpis;
 	gic_v3_kvm_info.has_v4_1 = gic_data.rdists.has_rvpeid;
-	gic_set_kvm_info(&gic_v3_kvm_info);
+	vgic_set_kvm_info(&gic_v3_kvm_info);
 }
 
 static int __init

drivers/irqchip/irq-gic.c

@@ -119,7 +119,7 @@ static DEFINE_STATIC_KEY_TRUE(supports_deactivate_key);
 
 static struct gic_chip_data gic_data[CONFIG_ARM_GIC_MAX_NR] __read_mostly;
 
-static struct gic_kvm_info gic_v2_kvm_info;
+static struct gic_kvm_info gic_v2_kvm_info __initdata;
 
 static DEFINE_PER_CPU(u32, sgi_intid);
 
@@ -1451,7 +1451,7 @@ static void __init gic_of_setup_kvm_info(struct device_node *node)
 		return;
 
 	if (static_branch_likely(&supports_deactivate_key))
-		gic_set_kvm_info(&gic_v2_kvm_info);
+		vgic_set_kvm_info(&gic_v2_kvm_info);
 }
 
 int __init
@@ -1618,7 +1618,7 @@ static void __init gic_acpi_setup_kvm_info(void)
 
 	gic_v2_kvm_info.maint_irq = irq;
 
-	gic_set_kvm_info(&gic_v2_kvm_info);
+	vgic_set_kvm_info(&gic_v2_kvm_info);
 }
 
 static int __init gic_v2_acpi_init(union acpi_subtable_headers *header,

include/kvm/arm_vgic.h

@@ -72,6 +72,9 @@ struct vgic_global {
 	bool			has_gicv4;
 	bool			has_gicv4_1;
 
+	/* Pseudo GICv3 from outer space */
+	bool			no_hw_deactivation;
+
 	/* GIC system register CPU interface */
 	struct static_key_false gicv3_cpuif;
 
@@ -89,6 +92,26 @@ enum vgic_irq_config {
 	VGIC_CONFIG_LEVEL
 };
 
+/*
+ * Per-irq ops overriding some common behavious.
+ *
+ * Always called in non-preemptible section and the functions can use
+ * kvm_arm_get_running_vcpu() to get the vcpu pointer for private IRQs.
+ */
+struct irq_ops {
+	/* Per interrupt flags for special-cased interrupts */
+	unsigned long flags;
+
+#define VGIC_IRQ_SW_RESAMPLE	BIT(0)	/* Clear the active state for resampling */
+
+	/*
+	 * Callback function pointer to in-kernel devices that can tell us the
+	 * state of the input level of mapped level-triggered IRQ faster than
+	 * peaking into the physical GIC.
+	 */
+	bool (*get_input_level)(int vintid);
+};
+
 struct vgic_irq {
 	raw_spinlock_t irq_lock;	/* Protects the content of the struct */
 	struct list_head lpi_list;	/* Used to link all LPIs together */
@@ -126,21 +149,17 @@ struct vgic_irq {
 	u8 group;			/* 0 == group 0, 1 == group 1 */
 	enum vgic_irq_config config;	/* Level or edge */
 
-	/*
-	 * Callback function pointer to in-kernel devices that can tell us the
-	 * state of the input level of mapped level-triggered IRQ faster than
-	 * peaking into the physical GIC.
-	 *
-	 * Always called in non-preemptible section and the functions can use
-	 * kvm_arm_get_running_vcpu() to get the vcpu pointer for private
-	 * IRQs.
-	 */
-	bool (*get_input_level)(int vintid);
+	struct irq_ops *ops;
 
 	void *owner;			/* Opaque pointer to reserve an interrupt
 					   for in-kernel devices. */
 };
 
+static inline bool vgic_irq_needs_resampling(struct vgic_irq *irq)
+{
+	return irq->ops && (irq->ops->flags & VGIC_IRQ_SW_RESAMPLE);
+}
+
 struct vgic_register_region;
 struct vgic_its;
 
@@ -352,7 +371,7 @@ void kvm_vgic_init_cpu_hardware(void);
 int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
 			bool level, void *owner);
 int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq,
-			  u32 vintid, bool (*get_input_level)(int vindid));
+			  u32 vintid, struct irq_ops *ops);
 int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int vintid);
 bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int vintid);
 

include/linux/irqchip/arm-gic-common.h

@@ -7,8 +7,7 @@
 #ifndef __LINUX_IRQCHIP_ARM_GIC_COMMON_H
 #define __LINUX_IRQCHIP_ARM_GIC_COMMON_H
 
-#include <linux/types.h>
-#include <linux/ioport.h>
+#include <linux/irqchip/arm-vgic-info.h>
 
 #define GICD_INT_DEF_PRI		0xa0
 #define GICD_INT_DEF_PRI_X4		((GICD_INT_DEF_PRI << 24) |\
@@ -16,28 +15,6 @@
 					(GICD_INT_DEF_PRI << 8) |\
 					GICD_INT_DEF_PRI)
 
-enum gic_type {
-	GIC_V2,
-	GIC_V3,
-};
-
-struct gic_kvm_info {
-	/* GIC type */
-	enum gic_type	type;
-	/* Virtual CPU interface */
-	struct resource vcpu;
-	/* Interrupt number */
-	unsigned int	maint_irq;
-	/* Virtual control interface */
-	struct resource vctrl;
-	/* vlpi support */
-	bool		has_v4;
-	/* rvpeid support */
-	bool		has_v4_1;
-};
-
-const struct gic_kvm_info *gic_get_kvm_info(void);
-
 struct irq_domain;
 struct fwnode_handle;
 int gicv2m_init(struct fwnode_handle *parent_handle,

include/linux/irqchip/arm-vgic-info.h

+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * include/linux/irqchip/arm-vgic-info.h
+ *
+ * Copyright (C) 2016 ARM Limited, All Rights Reserved.
+ */
+#ifndef __LINUX_IRQCHIP_ARM_VGIC_INFO_H
+#define __LINUX_IRQCHIP_ARM_VGIC_INFO_H
+
+#include <linux/types.h>
+#include <linux/ioport.h>
+
+enum gic_type {
+	/* Full GICv2 */
+	GIC_V2,
+	/* Full GICv3, optionally with v2 compat */
+	GIC_V3,
+};
+
+struct gic_kvm_info {
+	/* GIC type */
+	enum gic_type	type;
+	/* Virtual CPU interface */
+	struct resource vcpu;
+	/* Interrupt number */
+	unsigned int	maint_irq;
+	/* No interrupt mask, no need to use the above field */
+	bool		no_maint_irq_mask;
+	/* Virtual control interface */
+	struct resource vctrl;
+	/* vlpi support */
+	bool		has_v4;
+	/* rvpeid support */
+	bool		has_v4_1;
+	/* Deactivation impared, subpar stuff */
+	bool		no_hw_deactivation;
+};
+
+#ifdef CONFIG_KVM
+void vgic_set_kvm_info(const struct gic_kvm_info *info);
+#else
+static inline void vgic_set_kvm_info(const struct gic_kvm_info *info) {}
+#endif
+
+#endif