1 files changed, 221 insertions, 0 deletions
diff --git a/arch/arm/include/asm/kvm_vgic.h b/arch/arm/include/asm/kvm_vgic.h
new file mode 100644
index 000000000000..ab97207d9cd3
--- /dev/null
+++ b/arch/arm/include/asm/kvm_vgic.h
@@ -0,0 +1,221 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef __ASM_ARM_KVM_VGIC_H
+#define __ASM_ARM_KVM_VGIC_H
+
+#include <linux/kernel.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/irqreturn.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/irqchip/arm-gic.h>
+
+#define VGIC_NR_IRQS		128
+#define VGIC_NR_SGIS		16
+#define VGIC_NR_PPIS		16
+#define VGIC_NR_PRIVATE_IRQS	(VGIC_NR_SGIS + VGIC_NR_PPIS)
+#define VGIC_NR_SHARED_IRQS	(VGIC_NR_IRQS - VGIC_NR_PRIVATE_IRQS)
+#define VGIC_MAX_CPUS		KVM_MAX_VCPUS
+#define VGIC_MAX_LRS		(1 << 6)
+
+/* Sanity checks... */
+#if (VGIC_MAX_CPUS > 8)
+#error	Invalid number of CPU interfaces
+#endif
+
+#if (VGIC_NR_IRQS & 31)
+#error "VGIC_NR_IRQS must be a multiple of 32"
+#endif
+
+#if (VGIC_NR_IRQS > 1024)
+#error "VGIC_NR_IRQS must be <= 1024"
+#endif
+
+/*
+ * The GIC distributor registers describing interrupts have two parts:
+ * - 32 per-CPU interrupts (SGI + PPI)
+ * - a bunch of shared interrupts (SPI)
+ */
+struct vgic_bitmap {
+	union {
+		u32 reg[VGIC_NR_PRIVATE_IRQS / 32];
+		DECLARE_BITMAP(reg_ul, VGIC_NR_PRIVATE_IRQS);
+	} percpu[VGIC_MAX_CPUS];
+	union {
+		u32 reg[VGIC_NR_SHARED_IRQS / 32];
+		DECLARE_BITMAP(reg_ul, VGIC_NR_SHARED_IRQS);
+	} shared;
+};
+
+struct vgic_bytemap {
+	u32 percpu[VGIC_MAX_CPUS][VGIC_NR_PRIVATE_IRQS / 4];
+	u32 shared[VGIC_NR_SHARED_IRQS  / 4];
+};
+
+struct vgic_dist {
+#ifdef CONFIG_KVM_ARM_VGIC
+	spinlock_t		lock;
+	bool			ready;
+
+	/* Virtual control interface mapping */
+	void __iomem		*vctrl_base;
+
+	/* Distributor and vcpu interface mapping in the guest */
+	phys_addr_t		vgic_dist_base;
+	phys_addr_t		vgic_cpu_base;
+
+	/* Distributor enabled */
+	u32			enabled;
+
+	/* Interrupt enabled (one bit per IRQ) */
+	struct vgic_bitmap	irq_enabled;
+
+	/* Interrupt 'pin' level */
+	struct vgic_bitmap	irq_state;
+
+	/* Level-triggered interrupt in progress */
+	struct vgic_bitmap	irq_active;
+
+	/* Interrupt priority. Not used yet. */
+	struct vgic_bytemap	irq_priority;
+
+	/* Level/edge triggered */
+	struct vgic_bitmap	irq_cfg;
+
+	/* Source CPU per SGI and target CPU */
+	u8			irq_sgi_sources[VGIC_MAX_CPUS][VGIC_NR_SGIS];
+
+	/* Target CPU for each IRQ */
+	u8			irq_spi_cpu[VGIC_NR_SHARED_IRQS];
+	struct vgic_bitmap	irq_spi_target[VGIC_MAX_CPUS];
+
+	/* Bitmap indicating which CPU has something pending */
+	unsigned long		irq_pending_on_cpu;
+#endif
+};
+
+struct vgic_cpu {
+#ifdef CONFIG_KVM_ARM_VGIC
+	/* per IRQ to LR mapping */
+	u8		vgic_irq_lr_map[VGIC_NR_IRQS];
+
+	/* Pending interrupts on this VCPU */
+	DECLARE_BITMAP(	pending_percpu, VGIC_NR_PRIVATE_IRQS);
+	DECLARE_BITMAP(	pending_shared, VGIC_NR_SHARED_IRQS);
+
+	/* Bitmap of used/free list registers */
+	DECLARE_BITMAP(	lr_used, VGIC_MAX_LRS);
+
+	/* Number of list registers on this CPU */
+	int		nr_lr;
+
+	/* CPU vif control registers for world switch */
+	u32		vgic_hcr;
+	u32		vgic_vmcr;
+	u32		vgic_misr;	/* Saved only */
+	u32		vgic_eisr[2];	/* Saved only */
+	u32		vgic_elrsr[2];	/* Saved only */
+	u32		vgic_apr;
+	u32		vgic_lr[VGIC_MAX_LRS];
+#endif
+};
+
+#define LR_EMPTY	0xff
+
+struct kvm;
+struct kvm_vcpu;
+struct kvm_run;
+struct kvm_exit_mmio;
+
+#ifdef CONFIG_KVM_ARM_VGIC
+int kvm_vgic_set_addr(struct kvm *kvm, unsigned long type, u64 addr);
+int kvm_vgic_hyp_init(void);
+int kvm_vgic_init(struct kvm *kvm);
+int kvm_vgic_create(struct kvm *kvm);
+int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu);
+void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu);
+void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu);
+int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int irq_num,
+			bool level);
+int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu);
+bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
+		      struct kvm_exit_mmio *mmio);
+
+#define irqchip_in_kernel(k)	(!!((k)->arch.vgic.vctrl_base))
+#define vgic_initialized(k)	((k)->arch.vgic.ready)
+
+#else
+static inline int kvm_vgic_hyp_init(void)
+{
+	return 0;
+}
+
+static inline int kvm_vgic_set_addr(struct kvm *kvm, unsigned long type, u64 addr)
+{
+	return 0;
+}
+
+static inline int kvm_vgic_init(struct kvm *kvm)
+{
+	return 0;
+}
+
+static inline int kvm_vgic_create(struct kvm *kvm)
+{
+	return 0;
+}
+
+static inline int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
+{
+	return 0;
+}
+
+static inline void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu) {}
+static inline void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu) {}
+
+static inline int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid,
+				      unsigned int irq_num, bool level)
+{
+	return 0;
+}
+
+static inline int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
+{
+	return 0;
+}
+
+static inline bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
+				    struct kvm_exit_mmio *mmio)
+{
+	return false;
+}
+
+static inline int irqchip_in_kernel(struct kvm *kvm)
+{
+	return 0;
+}
+
+static inline bool vgic_initialized(struct kvm *kvm)
+{
+	return true;
+}
+#endif
+
+#endif