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authorMarc Zyngier <marc.zyngier@arm.com>2014-07-31 11:42:18 +0100
committerChristoffer Dall <christoffer.dall@linaro.org>2014-10-02 17:19:07 +0200
commit099fcd90255453a5976a42c5f9421a6a7ad7ce3d (patch)
tree7e6a073d9a4cf69ed6919cd4bd1e69c34472fa73 /virt
parent45104cfeec66c1314a2ae5e4cb436a9ace725e59 (diff)
downloadlinux-linaro-stable-099fcd90255453a5976a42c5f9421a6a7ad7ce3d.tar.gz
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 <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> (cherry picked from commit fb3ec67942e92e5713e05b7691b277d0a0c0575d) Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/vgic-v3.c16
1 files changed, 16 insertions, 0 deletions
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;