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/*
* Copyright (C) 2017 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, see <http://www.gnu.org/licenses/>.
*/
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/kvm_host.h>
#include "vgic.h"
/**
* vgic_v4_init - Initialize the GICv4 data structures
* @kvm: Pointer to the VM being initialized
*
* We may be called each time a vITS is created, or when the
* vgic is initialized. This relies on kvm->lock to be
* held. In both cases, the number of vcpus should now be
* fixed.
*/
int vgic_v4_init(struct kvm *kvm)
{
struct vgic_dist *dist = &kvm->arch.vgic;
struct kvm_vcpu *vcpu;
int i, nr_vcpus, ret;
if (dist->its_vm.vpes)
return 0;
nr_vcpus = atomic_read(&kvm->online_vcpus);
dist->its_vm.vpes = kzalloc(sizeof(*dist->its_vm.vpes) * nr_vcpus,
GFP_KERNEL);
if (!dist->its_vm.vpes)
return -ENOMEM;
dist->its_vm.nr_vpes = nr_vcpus;
kvm_for_each_vcpu(i, vcpu, kvm)
dist->its_vm.vpes[i] = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe;
ret = its_alloc_vcpu_irqs(&dist->its_vm);
if (ret < 0) {
kvm_err("VPE IRQ allocation failure\n");
kfree(dist->its_vm.vpes);
dist->its_vm.nr_vpes = 0;
dist->its_vm.vpes = NULL;
return ret;
}
return ret;
}
/**
* vgic_v4_teardown - Free the GICv4 data structures
* @kvm: Pointer to the VM being destroyed
*
* Relies on kvm->lock to be held.
*/
void vgic_v4_teardown(struct kvm *kvm)
{
struct its_vm *its_vm = &kvm->arch.vgic.its_vm;
if (!its_vm->vpes)
return;
its_free_vcpu_irqs(its_vm);
kfree(its_vm->vpes);
its_vm->nr_vpes = 0;
its_vm->vpes = NULL;
}
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