From fb3ec67942e92e5713e05b7691b277d0a0c0575d Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Thu, 31 Jul 2014 11:42:18 +0100 Subject: KVM: arm64: GICv3: mandate page-aligned GICV region Just like GICv2 was fixed in 63afbe7a0ac1 (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 Signed-off-by: Christoffer Dall --- virt/kvm/arm/vgic-v3.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'virt') diff --git a/virt/kvm/arm/vgic-v3.c b/virt/kvm/arm/vgic-v3.c index f01d44685720..1c2c8eef0599 100644 --- a/virt/kvm/arm/vgic-v3.c +++ b/virt/kvm/arm/vgic-v3.c @@ -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; -- cgit v1.2.1