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KVM: arm64: Disassociate vcpus from redistributor region on teardown 

commit 0d92e4a7ffd5c42b9fa864692f82476c0bf8bcc8 upstream.

When tearing down a redistributor region, make sure we don't have
any dangling pointer to that region stored in a vcpu.

Fixes: e5a3563546 ("kvm: arm64: vgic-v3: Introduce vgic_v3_free_redist_region()")
Reported-by: Alexander Potapenko <glider@google.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240605175637.1635653-1-maz@kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marc Zyngier 2024-06-05 18:56:37 +01:00 committed by Greg Kroah-Hartman
parent a937ef951b
commit 48bb62859d
3 changed files with 15 additions and 4 deletions
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2
arch/arm64/kvm/vgic/vgic-init.c
View File

@ -355,7 +355,7 @@ static void kvm_vgic_dist_destroy(struct kvm *kvm)
if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) {
list_for_each_entry_safe(rdreg, next, &dist->rd_regions, list)
vgic_v3_free_redist_region(rdreg);
vgic_v3_free_redist_region(kvm, rdreg);
INIT_LIST_HEAD(&dist->rd_regions);
} else {
dist->vgic_cpu_base = VGIC_ADDR_UNDEF;

15
arch/arm64/kvm/vgic/vgic-mmio-v3.c
View File

@ -942,8 +942,19 @@ free:
return ret;
}
void vgic_v3_free_redist_region(struct vgic_redist_region *rdreg)
void vgic_v3_free_redist_region(struct kvm *kvm, struct vgic_redist_region *rdreg)
{
struct kvm_vcpu *vcpu;
unsigned long c;
lockdep_assert_held(&kvm->arch.config_lock);
/* Garbage collect the region */
kvm_for_each_vcpu(c, vcpu, kvm) {
if (vcpu->arch.vgic_cpu.rdreg == rdreg)
vcpu->arch.vgic_cpu.rdreg = NULL;
}
list_del(&rdreg->list);
kfree(rdreg);
}
@ -968,7 +979,7 @@ int vgic_v3_set_redist_base(struct kvm *kvm, u32 index, u64 addr, u32 count)
mutex_lock(&kvm->arch.config_lock);
rdreg = vgic_v3_rdist_region_from_index(kvm, index);
vgic_v3_free_redist_region(rdreg);
vgic_v3_free_redist_region(kvm, rdreg);
mutex_unlock(&kvm->arch.config_lock);
return ret;
}

2
arch/arm64/kvm/vgic/vgic.h
View File

@ -310,7 +310,7 @@ vgic_v3_rd_region_size(struct kvm *kvm, struct vgic_redist_region *rdreg)
struct vgic_redist_region *vgic_v3_rdist_region_from_index(struct kvm *kvm,
u32 index);
void vgic_v3_free_redist_region(struct vgic_redist_region *rdreg);
void vgic_v3_free_redist_region(struct kvm *kvm, struct vgic_redist_region *rdreg);
bool vgic_v3_rdist_overlap(struct kvm *kvm, gpa_t base, size_t size);