1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * ARM Generic Interrupt Controller (GIC) v3 host support
4 */
5
6 #include <linux/kvm.h>
7 #include <linux/sizes.h>
8 #include <asm/kvm.h>
9
10 #include "kvm_util.h"
11 #include "../kvm_util_internal.h"
12 #include "vgic.h"
13
14 /*
15 * vGIC-v3 default host setup
16 *
17 * Input args:
18 * vm - KVM VM
19 * nr_vcpus - Number of vCPUs supported by this VM
20 * gicd_base_gpa - Guest Physical Address of the Distributor region
21 * gicr_base_gpa - Guest Physical Address of the Redistributor region
22 *
23 * Output args: None
24 *
25 * Return: GIC file-descriptor or negative error code upon failure
26 *
27 * The function creates a vGIC-v3 device and maps the distributor and
28 * redistributor regions of the guest. Since it depends on the number of
29 * vCPUs for the VM, it must be called after all the vCPUs have been created.
30 */
vgic_v3_setup(struct kvm_vm * vm,unsigned int nr_vcpus,uint64_t gicd_base_gpa,uint64_t gicr_base_gpa)31 int vgic_v3_setup(struct kvm_vm *vm, unsigned int nr_vcpus,
32 uint64_t gicd_base_gpa, uint64_t gicr_base_gpa)
33 {
34 int gic_fd;
35 uint64_t redist_attr;
36 struct list_head *iter;
37 unsigned int nr_gic_pages, nr_vcpus_created = 0;
38
39 TEST_ASSERT(nr_vcpus, "Number of vCPUs cannot be empty\n");
40
41 /*
42 * Make sure that the caller is infact calling this
43 * function after all the vCPUs are added.
44 */
45 list_for_each(iter, &vm->vcpus)
46 nr_vcpus_created++;
47 TEST_ASSERT(nr_vcpus == nr_vcpus_created,
48 "Number of vCPUs requested (%u) doesn't match with the ones created for the VM (%u)\n",
49 nr_vcpus, nr_vcpus_created);
50
51 /* Distributor setup */
52 gic_fd = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, false);
53 kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
54 KVM_VGIC_V3_ADDR_TYPE_DIST, &gicd_base_gpa, true);
55 nr_gic_pages = vm_calc_num_guest_pages(vm->mode, KVM_VGIC_V3_DIST_SIZE);
56 virt_map(vm, gicd_base_gpa, gicd_base_gpa, nr_gic_pages);
57
58 /* Redistributor setup */
59 redist_attr = REDIST_REGION_ATTR_ADDR(nr_vcpus, gicr_base_gpa, 0, 0);
60 kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
61 KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &redist_attr, true);
62 nr_gic_pages = vm_calc_num_guest_pages(vm->mode,
63 KVM_VGIC_V3_REDIST_SIZE * nr_vcpus);
64 virt_map(vm, gicr_base_gpa, gicr_base_gpa, nr_gic_pages);
65
66 kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
67 KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
68
69 return gic_fd;
70 }
71