Commit 552c9f47 authored by Christoffer Dall's avatar Christoffer Dall

KVM: arm/arm64: Fix bug when registering redist iodevs

If userspace creates the VCPUs after initializing the VGIC, then we end
up in a situation where we trigger a bug in kvm_vcpu_get_idx(), because
it is called prior to adding the VCPU into the vcpus array on the VM.

There is no tight coupling between the VCPU index and the area of the
redistributor region used for the VCPU, so we can simply ensure that all
creations of redistributors are serialized per VM, and increment an
offset when we successfully add a redistributor.

The vgic_register_redist_iodev() function can be called from two paths:
vgic_redister_all_redist_iodev() which is called via the kvm_vgic_addr()
device attribute handler.  This patch already holds the kvm->lock mutex.

The other path is via kvm_vgic_vcpu_init, which is called through a
longer chain from kvm_vm_ioctl_create_vcpu(), which releases the
kvm->lock mutex just before calling kvm_arch_vcpu_create(), so we can
simply take this mutex again later for our purposes.

Fixes: ab6f468c10 ("KVM: arm/arm64: Register iodevs when setting redist base and creating VCPUs")
Signed-off-by: default avatarChristoffer Dall <cdall@linaro.org>
Tested-by: default avatarJean-Philippe Brucker <jean-philippe.brucker@arm.com>
Reviewed-by: default avatarEric Auger <eric.auger@redhat.com>
parent 0c428a6a
...@@ -195,7 +195,10 @@ struct vgic_dist { ...@@ -195,7 +195,10 @@ struct vgic_dist {
/* either a GICv2 CPU interface */ /* either a GICv2 CPU interface */
gpa_t vgic_cpu_base; gpa_t vgic_cpu_base;
/* or a number of GICv3 redistributor regions */ /* or a number of GICv3 redistributor regions */
struct {
gpa_t vgic_redist_base; gpa_t vgic_redist_base;
gpa_t vgic_redist_free_offset;
};
}; };
/* distributor enabled */ /* distributor enabled */
......
...@@ -242,8 +242,11 @@ int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu) ...@@ -242,8 +242,11 @@ int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
* If we are creating a VCPU with a GICv3 we must also register the * If we are creating a VCPU with a GICv3 we must also register the
* KVM io device for the redistributor that belongs to this VCPU. * KVM io device for the redistributor that belongs to this VCPU.
*/ */
if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) {
mutex_lock(&vcpu->kvm->lock);
ret = vgic_register_redist_iodev(vcpu); ret = vgic_register_redist_iodev(vcpu);
mutex_unlock(&vcpu->kvm->lock);
}
return ret; return ret;
} }
......
...@@ -586,7 +586,7 @@ int vgic_register_redist_iodev(struct kvm_vcpu *vcpu) ...@@ -586,7 +586,7 @@ int vgic_register_redist_iodev(struct kvm_vcpu *vcpu)
if (!vgic_v3_check_base(kvm)) if (!vgic_v3_check_base(kvm))
return -EINVAL; return -EINVAL;
rd_base = vgic->vgic_redist_base + kvm_vcpu_get_idx(vcpu) * SZ_64K * 2; rd_base = vgic->vgic_redist_base + vgic->vgic_redist_free_offset;
sgi_base = rd_base + SZ_64K; sgi_base = rd_base + SZ_64K;
kvm_iodevice_init(&rd_dev->dev, &kvm_io_gic_ops); kvm_iodevice_init(&rd_dev->dev, &kvm_io_gic_ops);
...@@ -615,11 +615,14 @@ int vgic_register_redist_iodev(struct kvm_vcpu *vcpu) ...@@ -615,11 +615,14 @@ int vgic_register_redist_iodev(struct kvm_vcpu *vcpu)
ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, sgi_base, ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, sgi_base,
SZ_64K, &sgi_dev->dev); SZ_64K, &sgi_dev->dev);
mutex_unlock(&kvm->slots_lock); mutex_unlock(&kvm->slots_lock);
if (ret) if (ret) {
kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS,
&rd_dev->dev); &rd_dev->dev);
return ret; return ret;
}
vgic->vgic_redist_free_offset += 2 * SZ_64K;
return 0;
} }
static void vgic_unregister_redist_iodev(struct kvm_vcpu *vcpu) static void vgic_unregister_redist_iodev(struct kvm_vcpu *vcpu)
......
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