arm/arm64: KVM: Enforce Break-Before-Make on Stage-2 page tables
authorMarc Zyngier <marc.zyngier@arm.com>
Thu, 28 Apr 2016 15:16:31 +0000 (16:16 +0100)
committerChristoffer Dall <christoffer.dall@linaro.org>
Fri, 29 Apr 2016 11:46:14 +0000 (13:46 +0200)
commitd4b9e0790aa764c0b01e18d4e8d33e93ba36d51f
tree7c68840b2597a9403763465ddea994547b22c855
parent02e0b7600f8350078f01328095c20dd715700921
arm/arm64: KVM: Enforce Break-Before-Make on Stage-2 page tables

The ARM architecture mandates that when changing a page table entry
from a valid entry to another valid entry, an invalid entry is first
written, TLB invalidated, and only then the new entry being written.

The current code doesn't respect this, directly writing the new
entry and only then invalidating TLBs. Let's fix it up.

Cc: <stable@vger.kernel.org>
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>
arch/arm/kvm/mmu.c