[PATCH] KVM: arm/arm64: vgic: Add debugfs vgic-state file

[christoffer.dall@linaro.org (Christoffer Dall)]

Add a file to debugfs to read the in-kernel state of the vgic.  We don't
do any locking of the entire VGIC state while traversing all the IRQs,
so if the VM is running the user/developer may not see a quiesced state,
but should take care to pause the VM using facilities in user space for
that purpose.

We also don't support LPIs yet, but they can be added easily if needed.

Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
 arch/arm/kvm/Makefile          |   1 +
 arch/arm64/kvm/Makefile        |   1 +
 include/kvm/arm_vgic.h         |   5 +
 virt/kvm/arm/vgic/vgic-debug.c | 278 +++++++++++++++++++++++++++++++++++++++++
 virt/kvm/arm/vgic/vgic-init.c  |   4 +
 virt/kvm/arm/vgic/vgic.h       |   3 +
 6 files changed, 292 insertions(+)
 create mode 100644 virt/kvm/arm/vgic/vgic-debug.c

diff --git a/arch/arm/kvm/Makefile b/arch/arm/kvm/Makefile
index d571243..12b6281 100644
--- a/arch/arm/kvm/Makefile
+++ b/arch/arm/kvm/Makefile
@@ -33,5 +33,6 @@ obj-y += $(KVM)/arm/vgic/vgic-mmio-v2.o
 obj-y += $(KVM)/arm/vgic/vgic-mmio-v3.o
 obj-y += $(KVM)/arm/vgic/vgic-kvm-device.o
 obj-y += $(KVM)/arm/vgic/vgic-its.o
+obj-y += $(KVM)/arm/vgic/vgic-debug.o
 obj-y += $(KVM)/irqchip.o
 obj-y += $(KVM)/arm/arch_timer.o
diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile
index d50a82a..e025bec 100644
--- a/arch/arm64/kvm/Makefile
+++ b/arch/arm64/kvm/Makefile
@@ -31,6 +31,7 @@ kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-mmio-v2.o
 kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-mmio-v3.o
 kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-kvm-device.o
 kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-its.o
+kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-debug.o
 kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/irqchip.o
 kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/arch_timer.o
 kvm-$(CONFIG_KVM_ARM_PMU) += $(KVM)/arm/pmu.o
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 002f092..1087aee 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -165,6 +165,8 @@ struct vgic_its {
 	struct list_head	collection_list;
 };
 
+struct vgic_state_iter;
+
 struct vgic_dist {
 	bool			in_kernel;
 	bool			ready;
@@ -212,6 +214,9 @@ struct vgic_dist {
 	spinlock_t		lpi_list_lock;
 	struct list_head	lpi_list_head;
 	int			lpi_list_count;
+
+	/* used by vgic-debug */
+	struct vgic_state_iter *iter;
 };
 
 struct vgic_v2_cpu_if {
diff --git a/virt/kvm/arm/vgic/vgic-debug.c b/virt/kvm/arm/vgic/vgic-debug.c
new file mode 100644
index 0000000..76e8b11
--- /dev/null
+++ b/virt/kvm/arm/vgic/vgic-debug.c
@@ -0,0 +1,278 @@
+/*
+ * Copyright (C) 2016 Linaro
+ * Author: Christoffer Dall <christoffer.dall@linaro.org>
+ *
+ * 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/cpu.h>
+#include <linux/debugfs.h>
+#include <linux/interrupt.h>
+#include <linux/kvm_host.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include <kvm/arm_vgic.h>
+#include <asm/kvm_mmu.h>
+#include "vgic.h"
+
+/*
+ * Structure to control looping through the entire vgic state.  We start at
+ * zero for each field and move upwards.  So, if dist_id is 0 we print the
+ * distributor info.  When dist_id is 1, we have already printed it and move
+ * on.
+ *
+ * When vcpu_id < nr_cpus we print the vcpu info until vcpu_id == nr_cpus and
+ * so on.
+ */
+struct vgic_state_iter {
+	int nr_cpus;
+	int nr_spis;
+	int dist_id;
+	int vcpu_id;
+	int intid;
+};
+
+static void iter_next(struct vgic_state_iter *iter)
+{
+	if (iter->dist_id == 0) {
+		iter->dist_id++;
+		return;
+	}
+
+	iter->intid++;
+	if (iter->intid == VGIC_NR_PRIVATE_IRQS &&
+	    ++iter->vcpu_id < iter->nr_cpus)
+		iter->intid = 0;
+}
+
+static void iter_init(struct kvm *kvm, struct vgic_state_iter *iter,
+		      loff_t pos)
+{
+	int nr_cpus = atomic_read(&kvm->online_vcpus);
+
+	memset(iter, 0, sizeof(*iter));
+
+	iter->nr_cpus = nr_cpus;
+	iter->nr_spis = kvm->arch.vgic.nr_spis;
+
+	/* Fast forward to the right position if needed */
+	while (pos--)
+		iter_next(iter);
+}
+
+static bool the_end(struct vgic_state_iter *iter)
+{
+	return iter->dist_id > 0 &&
+		iter->vcpu_id == iter->nr_cpus &&
+		(iter->intid - VGIC_NR_PRIVATE_IRQS) == iter->nr_spis;
+}
+
+static void *debug_start(struct seq_file *s, loff_t *pos)
+{
+	struct kvm *kvm = (struct kvm *)s->private;
+	struct vgic_state_iter *iter;
+
+	mutex_lock(&kvm->lock);
+	iter = kvm->arch.vgic.iter;
+	if (iter) {
+		iter = ERR_PTR(-EBUSY);
+		goto out;
+	}
+
+	iter = kmalloc(sizeof(*iter), GFP_KERNEL);
+	if (!iter) {
+		iter = ERR_PTR(-ENOMEM);
+		goto out;
+	}
+
+	iter_init(kvm, iter, *pos);
+	kvm->arch.vgic.iter = iter;
+
+	if (the_end(iter))
+		iter = NULL;
+out:
+	mutex_unlock(&kvm->lock);
+	return iter;
+}
+
+static void *debug_next(struct seq_file *s, void *v, loff_t *pos)
+{
+	struct kvm *kvm = (struct kvm *)s->private;
+	struct vgic_state_iter *iter = kvm->arch.vgic.iter;
+
+	++*pos;
+	iter_next(iter);
+	if (the_end(iter))
+		iter = NULL;
+	return iter;
+}
+
+static void debug_stop(struct seq_file *s, void *v)
+{
+	struct kvm *kvm = (struct kvm *)s->private;
+	struct vgic_state_iter *iter;
+
+	mutex_lock(&kvm->lock);
+	iter = kvm->arch.vgic.iter;
+	kfree(iter);
+	kvm->arch.vgic.iter = NULL;
+	mutex_unlock(&kvm->lock);
+}
+
+static void print_dist_state(struct seq_file *s, struct vgic_dist *dist)
+{
+	seq_printf(s, "Distributor\n");
+	seq_printf(s, "===========\n");
+	seq_printf(s, "vgic_model:\t%s\n",
+		   (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) ?
+		   "GICv3" : "GICv2");
+	seq_printf(s, "nr_spis:\t%d\n", dist->nr_spis);
+	seq_printf(s, "enabled:\t%d\n", dist->enabled);
+	seq_printf(s, "\n");
+
+	seq_printf(s, "P=pending, L=line_level, S=soft_pending, A=active\n");
+	seq_printf(s, "E=enabled, H=hw, L=config_level\n");
+}
+
+static void print_header(struct seq_file *s, struct vgic_irq *irq,
+			 struct kvm_vcpu *vcpu)
+{
+	int id = 0;
+	char *hdr = "SPI ";
+
+	if (vcpu) {
+		hdr = "VCPU";
+		id = vcpu->vcpu_id;
+	}
+
+	seq_printf(s, "\n");
+	seq_printf(s, "%s%2d TYP   ID TGT_ID PLSAEHL     HWID    MPIDR SRC PRI VCPU_ID\n", hdr, id);
+	seq_printf(s, "----------------------------------------------------------------\n");
+}
+
+static void print_irq_state(struct seq_file *s, struct vgic_irq *irq,
+			    struct kvm_vcpu *vcpu)
+{
+	char *type;
+	if (irq->intid < VGIC_NR_SGIS)
+		type = "SGI";
+	else if (irq->intid < VGIC_NR_PRIVATE_IRQS)
+		type = "PPI";
+	else
+		type = "SPI";
+
+	if (irq->intid ==0 || irq->intid == VGIC_NR_PRIVATE_IRQS)
+		print_header(s, irq, vcpu);
+
+	seq_printf(s, "       %s %4d "
+		      "    %2d "
+		      "%d%d%d%d%d%d%d "
+		      "%8x "
+		      "%8x "
+		      " %2x "
+		      " %2x "
+		      "     %2d "
+		      "\n",
+			type, irq->intid,
+			(irq->target_vcpu) ? irq->target_vcpu->vcpu_id : -1,
+			irq->pending,
+			irq->line_level,
+			irq->soft_pending,
+			irq->active,
+			irq->enabled,
+			irq->hw,
+			irq->config == VGIC_CONFIG_LEVEL,
+			irq->hwintid,
+			irq->mpidr,
+			irq->source,
+			irq->priority,
+			(irq->vcpu) ? irq->vcpu->vcpu_id : -1);
+
+}
+
+static int debug_show(struct seq_file *s, void *v)
+{
+	struct kvm *kvm = (struct kvm *)s->private;
+	struct vgic_state_iter *iter = (struct vgic_state_iter *)v;
+	struct vgic_irq *irq;
+	struct kvm_vcpu *vcpu = NULL;
+
+	if (iter->dist_id == 0) {
+		print_dist_state(s, &kvm->arch.vgic);
+		return 0;
+	}
+
+	if (!kvm->arch.vgic.initialized)
+		return 0;
+
+	if (iter->vcpu_id < iter->nr_cpus) {
+		vcpu = kvm_get_vcpu(kvm, iter->vcpu_id);
+		irq = &vcpu->arch.vgic_cpu.private_irqs[iter->intid];
+	} else {
+		irq = &kvm->arch.vgic.spis[iter->intid - VGIC_NR_PRIVATE_IRQS];
+	}
+
+	spin_lock(&irq->irq_lock);
+	print_irq_state(s, irq, vcpu);
+	spin_unlock(&irq->irq_lock);
+
+	return 0;
+}
+
+static struct seq_operations debug_seq_ops = {
+	.start = debug_start,
+	.next  = debug_next,
+	.stop  = debug_stop,
+	.show  = debug_show
+};
+
+static int debug_open(struct inode *inode, struct file *file)
+{
+	int ret;
+	ret = seq_open(file, &debug_seq_ops);
+	if (!ret) {
+		struct seq_file *seq;
+		/* seq_open will have modified file->private_data */
+		seq = file->private_data;
+		seq->private = inode->i_private;
+	}
+
+	return ret;
+};
+
+static struct file_operations vgic_debug_fops = {
+	.owner   = THIS_MODULE,
+	.open    = debug_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release
+};
+
+int vgic_debug_init(struct kvm *kvm)
+{
+	if (!kvm->debugfs_dentry)
+		return -ENOENT;
+
+	if (!debugfs_create_file("vgic-state", 0444,
+				 kvm->debugfs_dentry,
+				 kvm,
+				 &vgic_debug_fops))
+		return -ENOMEM;
+
+	return 0;
+}
+
+int vgic_debug_destroy(struct kvm *kvm)
+{
+	return 0;
+}
diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c
index 5114391..cf8e812 100644
--- a/virt/kvm/arm/vgic/vgic-init.c
+++ b/virt/kvm/arm/vgic/vgic-init.c
@@ -259,6 +259,8 @@ int vgic_init(struct kvm *kvm)
 	if (ret)
 		goto out;
 
+	vgic_debug_init(kvm);
+
 	dist->initialized = true;
 out:
 	return ret;
@@ -291,6 +293,8 @@ void kvm_vgic_destroy(struct kvm *kvm)
 	struct kvm_vcpu *vcpu;
 	int i;
 
+	vgic_debug_destroy(kvm);
+
 	kvm_vgic_dist_destroy(kvm);
 
 	kvm_for_each_vcpu(i, vcpu, kvm)
diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
index 859f65c..bbcbdbb 100644
--- a/virt/kvm/arm/vgic/vgic.h
+++ b/virt/kvm/arm/vgic/vgic.h
@@ -94,4 +94,7 @@ int kvm_register_vgic_device(unsigned long type);
 int vgic_lazy_init(struct kvm *kvm);
 int vgic_init(struct kvm *kvm);
 
+int vgic_debug_init(struct kvm *kvm);
+int vgic_debug_destroy(struct kvm *kvm);
+
 #endif
-- 
2.9.0