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kvm: arm64: vgic: Introduce vgic_check_iorange

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Add the new vgic_check_iorange helper that checks that an iorange is
sane: the start address and size have valid alignments, the range is
within the addressable PA range, start+size doesn't overflow, and the
start wasn't already defined.

No functional change.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Ricardo Koller <ricarkol@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211005011921.437353-2-ricarkol@google.com
This commit is contained in:
Ricardo Koller 2021-10-04 18:19:11 -07:00 committed by Marc Zyngier
parent 9e1ff307c7
commit f25c5e4daf
2 changed files with 26 additions and 0 deletions
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22
arch/arm64/kvm/vgic/vgic-kvm-device.c
View File

@ -29,6 +29,28 @@ int vgic_check_ioaddr(struct kvm *kvm, phys_addr_t *ioaddr,
return 0;
}
int vgic_check_iorange(struct kvm *kvm, phys_addr_t ioaddr,
phys_addr_t addr, phys_addr_t alignment,
phys_addr_t size)
{
int ret;
ret = vgic_check_ioaddr(kvm, &ioaddr, addr, alignment);
if (ret)
return ret;
if (!IS_ALIGNED(size, alignment))
return -EINVAL;
if (addr + size < addr)
return -EINVAL;
if (addr + size > kvm_phys_size(kvm))
return -E2BIG;
return 0;
}
static int vgic_check_type(struct kvm *kvm, int type_needed)
{
if (kvm->arch.vgic.vgic_model != type_needed)

4
arch/arm64/kvm/vgic/vgic.h
View File

@ -175,6 +175,10 @@ void vgic_irq_handle_resampling(struct vgic_irq *irq,
int vgic_check_ioaddr(struct kvm *kvm, phys_addr_t *ioaddr,
phys_addr_t addr, phys_addr_t alignment);
int vgic_check_iorange(struct kvm *kvm, phys_addr_t ioaddr,
phys_addr_t addr, phys_addr_t alignment,
phys_addr_t size);
void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu);
void vgic_v2_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr);
void vgic_v2_clear_lr(struct kvm_vcpu *vcpu, int lr);