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authorChristoffer Dall <christoffer.dall@linaro.org>2016-08-03 18:03:44 +0200
committerChristoffer Dall <christoffer.dall@linaro.org>2016-08-15 23:00:20 +0200
commitd9ae449b3d14d7c55f69af329972f175d180e68d (patch)
treec9b04b65130b96654d275cb550568748a4087f08 /virt/kvm/arm/vgic/vgic-its.c
parent2cccbb368a2bf27d98cf36bb424fbbf5572c0fab (diff)
downloadlinux-stericsson-d9ae449b3d14d7c55f69af329972f175d180e68d.tar.gz
KVM: arm64: vgic-its: Make updates to propbaser/pendbaser atomic
There are two problems with the current implementation of the MMIO handlers for the propbaser and pendbaser: First, the write to the value itself is not guaranteed to be an atomic 64-bit write so two concurrent writes to the structure field could be intermixed. Second, because we do a read-modify-update operation without any synchronization, if we have two 32-bit accesses to separate parts of the register, we can loose one of them. By using the atomic cmpxchg64 we should cover both issues above. Reviewed-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
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