diff options
| author | Marc Zyngier <marc.zyngier@arm.com> | 2017-01-25 12:29:59 +0000 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2017-06-05 21:17:00 +0100 |
| commit | 9e81d29f18cabe9084578494ac6cb61dd40e7920 (patch) | |
| tree | dc2fd35115808d76b15687ed7a342a6c7ff9de86 /arch/arm64/include | |
| parent | 324b4fb18d8b08633fa109e9a9d4aba44af2ddb8 (diff) | |
arm/arm64: KVM: Enforce unconditional flush to PoC when mapping to stage-2
commit 8f36ebaf21fdae99c091c67e8b6fab33969f2667 upstream.
When we fault in a page, we flush it to the PoC (Point of Coherency)
if the faulting vcpu has its own caches off, so that it can observe
the page we just brought it.
But if the vcpu has its caches on, we skip that step. Bad things
happen when *another* vcpu tries to access that page with its own
caches disabled. At that point, there is no garantee that the
data has made it to the PoC, and we access stale data.
The obvious fix is to always flush to PoC when a page is faulted
in, no matter what the state of the vcpu is.
Fixes: 2d58b733c876 ("arm64: KVM: force cache clean on page fault when caches are off")
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
[bwh: Backported to 3.16: conditions for flushing were simpler here]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/kvm_mmu.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h index 2067f4b75d13..7758e0f478a3 100644 --- a/arch/arm64/include/asm/kvm_mmu.h +++ b/arch/arm64/include/asm/kvm_mmu.h @@ -141,8 +141,7 @@ static inline bool vcpu_has_cache_enabled(struct kvm_vcpu *vcpu) static inline void coherent_cache_guest_page(struct kvm_vcpu *vcpu, hva_t hva, unsigned long size) { - if (!vcpu_has_cache_enabled(vcpu)) - kvm_flush_dcache_to_poc((void *)hva, size); + kvm_flush_dcache_to_poc((void *)hva, size); if (!icache_is_aliasing()) { /* PIPT */ flush_icache_range(hva, hva + size); |