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authorMarc Zyngier <marc.zyngier@arm.com>2016-08-22 11:01:17 +0300
committerChristoffer Dall <christoffer.dall@linaro.org>2016-09-06 14:09:31 +0300
commitd2896d4b55b2e32b423072a4124d7da4dc1e6cb1 (patch)
treeeb7df663d067362b49b884db81c66f92b76a2c41 /arch/arm
parent20218b86ad8adb4bf71db9425bb59680f345eafd (diff)
downloadlinux-d2896d4b55b2e32b423072a4124d7da4dc1e6cb1.tar.xz
arm: KVM: Fix idmap overlap detection when the kernel is idmap'ed
We're trying hard to detect when the HYP idmap overlaps with the HYP va, as it makes the teardown of a cpu dangerous. But there is one case where an overlap is completely safe, which is when the whole of the kernel is idmap'ed, which is likely to happen on 32bit when RAM is at 0x8000000 and we're using a 2G/2G VA split. In that case, we can proceed safely. Reported-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/kvm/mmu.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index 29d0b23af2a9..a3faafe70081 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -1714,7 +1714,8 @@ int kvm_mmu_init(void)
kern_hyp_va(PAGE_OFFSET), kern_hyp_va(~0UL));
if (hyp_idmap_start >= kern_hyp_va(PAGE_OFFSET) &&
- hyp_idmap_start < kern_hyp_va(~0UL)) {
+ hyp_idmap_start < kern_hyp_va(~0UL) &&
+ hyp_idmap_start != (unsigned long)__hyp_idmap_text_start) {
/*
* The idmap page is intersecting with the VA space,
* it is not safe to continue further.