250b8d6cb3
Implement a simple library to perform vGIC-v3 setup from a host point of view. This includes creating a vGIC device, setting up distributor and redistributor attributes, and mapping the guest physical addresses. The definition of REDIST_REGION_ATTR_ADDR is taken from aarch64/vgic_init test. Hence, replace the definition by including vgic.h in the test file. Signed-off-by: Raghavendra Rao Ananta <rananta@google.com> Reviewed-by: Ricardo Koller <ricarkol@google.com> Reviewed-by: Andrew Jones <drjones@redhat.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20211007233439.1826892-14-rananta@google.com
70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ARM Generic Interrupt Controller (GIC) v3 host support
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*/
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#include <linux/kvm.h>
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#include <linux/sizes.h>
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#include <asm/kvm.h>
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#include "kvm_util.h"
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#include "../kvm_util_internal.h"
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#include "vgic.h"
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/*
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* vGIC-v3 default host setup
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*
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* Input args:
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* vm - KVM VM
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* nr_vcpus - Number of vCPUs supported by this VM
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* gicd_base_gpa - Guest Physical Address of the Distributor region
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* gicr_base_gpa - Guest Physical Address of the Redistributor region
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*
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* Output args: None
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*
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* Return: GIC file-descriptor or negative error code upon failure
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*
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* The function creates a vGIC-v3 device and maps the distributor and
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* redistributor regions of the guest. Since it depends on the number of
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* vCPUs for the VM, it must be called after all the vCPUs have been created.
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*/
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int vgic_v3_setup(struct kvm_vm *vm, unsigned int nr_vcpus,
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uint64_t gicd_base_gpa, uint64_t gicr_base_gpa)
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{
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int gic_fd;
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uint64_t redist_attr;
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struct list_head *iter;
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unsigned int nr_gic_pages, nr_vcpus_created = 0;
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TEST_ASSERT(nr_vcpus, "Number of vCPUs cannot be empty\n");
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/*
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* Make sure that the caller is infact calling this
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* function after all the vCPUs are added.
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*/
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list_for_each(iter, &vm->vcpus)
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nr_vcpus_created++;
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TEST_ASSERT(nr_vcpus == nr_vcpus_created,
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"Number of vCPUs requested (%u) doesn't match with the ones created for the VM (%u)\n",
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nr_vcpus, nr_vcpus_created);
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/* Distributor setup */
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gic_fd = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, false);
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kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
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KVM_VGIC_V3_ADDR_TYPE_DIST, &gicd_base_gpa, true);
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nr_gic_pages = vm_calc_num_guest_pages(vm->mode, KVM_VGIC_V3_DIST_SIZE);
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virt_map(vm, gicd_base_gpa, gicd_base_gpa, nr_gic_pages);
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/* Redistributor setup */
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redist_attr = REDIST_REGION_ATTR_ADDR(nr_vcpus, gicr_base_gpa, 0, 0);
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kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
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KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &redist_attr, true);
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nr_gic_pages = vm_calc_num_guest_pages(vm->mode,
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KVM_VGIC_V3_REDIST_SIZE * nr_vcpus);
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virt_map(vm, gicr_base_gpa, gicr_base_gpa, nr_gic_pages);
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kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
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KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
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return gic_fd;
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}
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