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| author | Christoffer Dall <christoffer.dall@linaro.org> | 2016-08-03 18:03:44 +0200 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2016-08-15 23:00:20 +0200 |
| commit | d9ae449b3d14d7c55f69af329972f175d180e68d (patch) | |
| tree | c9b04b65130b96654d275cb550568748a4087f08 | |
| parent | 2cccbb368a2bf27d98cf36bb424fbbf5572c0fab (diff) | |
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>