ARM/arm64: KVM: correct PTE uncachedness check
authorArd Biesheuvel <ard.biesheuvel@linaro.org>
Thu, 3 Dec 2015 08:25:22 +0000 (09:25 +0100)
committerMarc Zyngier <marc.zyngier@arm.com>
Fri, 4 Dec 2015 16:30:17 +0000 (16:30 +0000)
commit0de58f852875a0f0dcfb120bb8433e4e73c7803b
tree8ca1061b90dd970afdb9054489a11d788a5b89c4
parentf6be563abb60f0fa6978dec46da01164df89a635
ARM/arm64: KVM: correct PTE uncachedness check

Commit e6fab5442345 ("ARM/arm64: KVM: test properly for a PTE's
uncachedness") modified the logic to test whether a HYP or stage-2
mapping needs flushing, from [incorrectly] interpreting the page table
attributes to [incorrectly] checking whether the PFN that backs the
mapping is covered by host system RAM. The PFN number is part of the
output of the translation, not the input, so we have to use pte_pfn()
on the contents of the PTE, not __phys_to_pfn() on the HYP virtual
address or stage-2 intermediate physical address.

Fixes: e6fab5442345 ("ARM/arm64: KVM: test properly for a PTE's uncachedness")
Cc: stable@vger.kernel.org
Tested-by: Pavel Fedin <p.fedin@samsung.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
arch/arm/kvm/mmu.c