diff options
author | Marc Zyngier <marc.zyngier@arm.com> | 2018-01-21 19:42:56 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-01 22:58:27 +0300 |
commit | e5a290c4ff77c9fb3fcb1dee7cfb356969daeee2 (patch) | |
tree | e61d3d273424c6dc024b029f333fa9c3f966ee94 /sound/sparc | |
parent | a2066aa76a7a487b93bc6135b6add2f0036d4ef6 (diff) | |
download | linux-e5a290c4ff77c9fb3fcb1dee7cfb356969daeee2.tar.xz |
arm/arm64: KVM: Add PSCI version selection API
commit 85bd0ba1ff9875798fad94218b627ea9f768f3c3 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound/sparc')
0 files changed, 0 insertions, 0 deletions