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KVM: arm64: GICv3: mandate page-aligned GICV region

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Just like GICv2 was fixed in 63afbe7a0a
(kvm: arm64: vgic: fix hyp panic with 64k pages on juno platform),
mandate the GICV region to be both aligned on a page boundary and
its size to be a multiple of page size.

This prevents a guest from being able to poke at regions where we
have no idea what is sitting there.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Marc Zyngier 2014-07-31 11:42:18 +01:00 committed by Christoffer Dall
parent f4c321eb26
commit fb3ec67942
1 changed files with 16 additions and 0 deletions
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16
virt/kvm/arm/vgic-v3.c
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@ -215,6 +215,22 @@ int vgic_v3_probe(struct device_node *vgic_node,
ret = -ENXIO;
goto out;
}
if (!PAGE_ALIGNED(vcpu_res.start)) {
kvm_err("GICV physical address 0x%llx not page aligned\n",
(unsigned long long)vcpu_res.start);
ret = -ENXIO;
goto out;
}
if (!PAGE_ALIGNED(resource_size(&vcpu_res))) {
kvm_err("GICV size 0x%llx not a multiple of page size 0x%lx\n",
(unsigned long long)resource_size(&vcpu_res),
PAGE_SIZE);
ret = -ENXIO;
goto out;
}
vgic->vcpu_base = vcpu_res.start;
vgic->vctrl_base = NULL;
vgic->type = VGIC_V3;