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// SPDX-License-Identifier: GPL-2.0
/*
* ARM Generic Interrupt Controller (GIC) v3 host support
*/
#include <linux/kvm.h>
#include <linux/sizes.h>
#include <asm/kvm.h>
#include "kvm_util.h"
#include "../kvm_util_internal.h"
#include "vgic.h"
/*
* vGIC-v3 default host setup
*
* Input args:
* vm - KVM VM
* nr_vcpus - Number of vCPUs supported by this VM
* gicd_base_gpa - Guest Physical Address of the Distributor region
* gicr_base_gpa - Guest Physical Address of the Redistributor region
*
* Output args: None
*
* Return: GIC file-descriptor or negative error code upon failure
*
* The function creates a vGIC-v3 device and maps the distributor and
* redistributor regions of the guest. Since it depends on the number of
* vCPUs for the VM, it must be called after all the vCPUs have been created.
*/
int vgic_v3_setup(struct kvm_vm *vm, unsigned int nr_vcpus,
uint64_t gicd_base_gpa, uint64_t gicr_base_gpa)
{
int gic_fd;
uint64_t redist_attr;
struct list_head *iter;
unsigned int nr_gic_pages, nr_vcpus_created = 0;
TEST_ASSERT(nr_vcpus, "Number of vCPUs cannot be empty\n");
/*
* Make sure that the caller is infact calling this
* function after all the vCPUs are added.
*/
list_for_each(iter, &vm->vcpus)
nr_vcpus_created++;
TEST_ASSERT(nr_vcpus == nr_vcpus_created,
"Number of vCPUs requested (%u) doesn't match with the ones created for the VM (%u)\n",
nr_vcpus, nr_vcpus_created);
/* Distributor setup */
gic_fd = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, false);
kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
KVM_VGIC_V3_ADDR_TYPE_DIST, &gicd_base_gpa, true);
nr_gic_pages = vm_calc_num_guest_pages(vm->mode, KVM_VGIC_V3_DIST_SIZE);
virt_map(vm, gicd_base_gpa, gicd_base_gpa, nr_gic_pages);
/* Redistributor setup */
redist_attr = REDIST_REGION_ATTR_ADDR(nr_vcpus, gicr_base_gpa, 0, 0);
kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &redist_attr, true);
nr_gic_pages = vm_calc_num_guest_pages(vm->mode,
KVM_VGIC_V3_REDIST_SIZE * nr_vcpus);
virt_map(vm, gicr_base_gpa, gicr_base_gpa, nr_gic_pages);
kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
return gic_fd;
}
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