Commit f25c5e4d authored by Ricardo Koller's avatar Ricardo Koller Committed by Marc Zyngier
Browse files

kvm: arm64: vgic: Introduce vgic_check_iorange 



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: default avatarEric Auger <eric.auger@redhat.com>
Signed-off-by: default avatarRicardo Koller <ricarkol@google.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211005011921.437353-2-ricarkol@google.com
parent 9e1ff307

arch/arm64/kvm/vgic/vgic-kvm-device.c

+22 −0
Original line number Diff line number Diff line
@@ -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)

arch/arm64/kvm/vgic/vgic.h

+4 −0
Original line number Diff line number Diff line
@@ -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);