2 * Copyright (C) 2015, 2016 ARM Ltd.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 #ifndef __ASM_ARM_KVM_VGIC_VGIC_H
17 #define __ASM_ARM_KVM_VGIC_VGIC_H
19 #include <linux/kernel.h>
20 #include <linux/kvm.h>
21 #include <linux/irqreturn.h>
22 #include <linux/spinlock.h>
23 #include <linux/types.h>
24 #include <kvm/iodev.h>
26 #define VGIC_V3_MAX_CPUS 255
27 #define VGIC_V2_MAX_CPUS 8
28 #define VGIC_NR_IRQS_LEGACY 256
29 #define VGIC_NR_SGIS 16
30 #define VGIC_NR_PPIS 16
31 #define VGIC_NR_PRIVATE_IRQS (VGIC_NR_SGIS + VGIC_NR_PPIS)
32 #define VGIC_MAX_PRIVATE (VGIC_NR_PRIVATE_IRQS - 1)
33 #define VGIC_MAX_SPI 1019
34 #define VGIC_MAX_RESERVED 1023
35 #define VGIC_MIN_LPI 8192
38 VGIC_V2
, /* Good ol' GICv2 */
39 VGIC_V3
, /* New fancy GICv3 */
42 /* same for all guests, as depending only on the _host's_ GIC model */
44 /* type of the host GIC */
47 /* Physical address of vgic virtual cpu interface */
48 phys_addr_t vcpu_base
;
50 /* virtual control interface mapping */
51 void __iomem
*vctrl_base
;
53 /* Number of implemented list registers */
56 /* Maintenance IRQ number */
57 unsigned int maint_irq
;
59 /* maximum number of VCPUs allowed (GICv2 limits us to 8) */
62 /* Only needed for the legacy KVM_CREATE_IRQCHIP */
63 bool can_emulate_gicv2
;
66 extern struct vgic_global kvm_vgic_global_state
;
68 #define VGIC_V2_MAX_LRS (1 << 6)
69 #define VGIC_V3_MAX_LRS 16
70 #define VGIC_V3_LR_INDEX(lr) (VGIC_V3_MAX_LRS - 1 - lr)
72 enum vgic_irq_config
{
78 spinlock_t irq_lock
; /* Protects the content of the struct */
79 struct list_head ap_list
;
81 struct kvm_vcpu
*vcpu
; /* SGIs and PPIs: The VCPU
82 * SPIs and LPIs: The VCPU whose ap_list
86 struct kvm_vcpu
*target_vcpu
; /* The VCPU that this interrupt should
87 * be sent to, as a result of the
88 * targets reg (v2) or the
92 u32 intid
; /* Guest visible INTID */
94 bool line_level
; /* Level only */
95 bool soft_pending
; /* Level only */
96 bool active
; /* not used for LPIs */
98 bool hw
; /* Tied to HW IRQ */
99 u32 hwintid
; /* HW INTID number */
101 u8 targets
; /* GICv2 target VCPUs mask */
102 u32 mpidr
; /* GICv3 target VCPU */
104 u8 source
; /* GICv2 SGIs only */
106 enum vgic_irq_config config
; /* Level or edge */
109 struct vgic_register_region
;
111 struct vgic_io_device
{
113 struct kvm_vcpu
*redist_vcpu
;
114 const struct vgic_register_region
*regions
;
116 struct kvm_io_device dev
;
123 /* vGIC model the kernel emulates for the guest (GICv2 or GICv3) */
128 /* TODO: Consider moving to global state */
129 /* Virtual control interface mapping */
130 void __iomem
*vctrl_base
;
132 /* base addresses in guest physical address space: */
133 gpa_t vgic_dist_base
; /* distributor */
135 /* either a GICv2 CPU interface */
137 /* or a number of GICv3 redistributor regions */
138 gpa_t vgic_redist_base
;
141 /* distributor enabled */
144 struct vgic_irq
*spis
;
146 struct vgic_io_device dist_iodev
;
147 struct vgic_io_device
*redist_iodevs
;
150 struct vgic_v2_cpu_if
{
153 u32 vgic_misr
; /* Saved only */
154 u64 vgic_eisr
; /* Saved only */
155 u64 vgic_elrsr
; /* Saved only */
157 u32 vgic_lr
[VGIC_V2_MAX_LRS
];
160 struct vgic_v3_cpu_if
{
161 #ifdef CONFIG_KVM_ARM_VGIC_V3
164 u32 vgic_sre
; /* Restored only, change ignored */
165 u32 vgic_misr
; /* Saved only */
166 u32 vgic_eisr
; /* Saved only */
167 u32 vgic_elrsr
; /* Saved only */
170 u64 vgic_lr
[VGIC_V3_MAX_LRS
];
175 /* CPU vif control registers for world switch */
177 struct vgic_v2_cpu_if vgic_v2
;
178 struct vgic_v3_cpu_if vgic_v3
;
181 unsigned int used_lrs
;
182 struct vgic_irq private_irqs
[VGIC_NR_PRIVATE_IRQS
];
184 spinlock_t ap_list_lock
; /* Protects the ap_list */
187 * List of IRQs that this VCPU should consider because they are either
188 * Active or Pending (hence the name; AP list), or because they recently
189 * were one of the two and need to be migrated off this list to another
192 struct list_head ap_list_head
;
197 int kvm_vgic_inject_irq(struct kvm
*kvm
, int cpuid
, unsigned int intid
,
200 int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu
*vcpu
);
202 #define irqchip_in_kernel(k) (!!((k)->arch.vgic.in_kernel))
203 #define vgic_initialized(k) (false)
204 #define vgic_ready(k) ((k)->arch.vgic.ready)
205 #define vgic_valid_spi(k, i) (((i) >= VGIC_NR_PRIVATE_IRQS) && \
206 ((i) < (k)->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS))
208 bool kvm_vcpu_has_pending_irqs(struct kvm_vcpu
*vcpu
);
209 void kvm_vgic_sync_hwstate(struct kvm_vcpu
*vcpu
);
210 void kvm_vgic_flush_hwstate(struct kvm_vcpu
*vcpu
);
212 #ifdef CONFIG_KVM_ARM_VGIC_V3
213 void vgic_v3_dispatch_sgi(struct kvm_vcpu
*vcpu
, u64 reg
);
215 static inline void vgic_v3_dispatch_sgi(struct kvm_vcpu
*vcpu
, u64 reg
)
221 * kvm_vgic_get_max_vcpus - Get the maximum number of VCPUs allowed by HW
223 * The host's GIC naturally limits the maximum amount of VCPUs a guest
226 static inline int kvm_vgic_get_max_vcpus(void)
228 return kvm_vgic_global_state
.max_gic_vcpus
;
231 #endif /* __ASM_ARM_KVM_VGIC_VGIC_H */