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authorMarc Zyngier <marc.zyngier@arm.com>2018-01-21 16:42:56 +0000
committerMarc Zyngier <marc.zyngier@arm.com>2018-04-20 16:32:23 +0100
commit85bd0ba1ff9875798fad94218b627ea9f768f3c3 (patch)
tree7a1d8741a980a8d8d0a235c1784b2121634a9265 /MAINTAINERS
parentbf9a41377d14f565764022470e14aae72559589a (diff)
downloadlinux-85bd0ba1ff9875798fad94218b627ea9f768f3c3.tar.bz2
arm/arm64: KVM: Add PSCI version selection API
Although we've implemented PSCI 0.1, 0.2 and 1.0, we expose either 0.1 or 1.0 to a guest, defaulting to the latest version of the PSCI implementation that is compatible with the requested version. This is no different from doing a firmware upgrade on KVM. But in order to give a chance to hypothetical badly implemented guests that would have a fit by discovering something other than PSCI 0.2, let's provide a new API that allows userspace to pick one particular version of the API. This is implemented as a new class of "firmware" registers, where we expose the PSCI version. This allows the PSCI version to be save/restored as part of a guest migration, and also set to any supported version if the guest requires it. Cc: stable@vger.kernel.org #4.16 Reviewed-by: Christoffer Dall <cdall@kernel.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
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