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| author | Marc Zyngier <marc.zyngier@arm.com> | 2018-01-21 16:42:56 +0000 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2018-04-20 16:32:23 +0100 |
| commit | 85bd0ba1ff9875798fad94218b627ea9f768f3c3 (patch) | |
| tree | 7a1d8741a980a8d8d0a235c1784b2121634a9265 /arch/arm64/include/asm | |
| parent | bf9a41377d14f565764022470e14aae72559589a (diff) | |
| download | linux-85bd0ba1ff9875798fad94218b627ea9f768f3c3.tar.gz linux-85bd0ba1ff9875798fad94218b627ea9f768f3c3.tar.bz2 linux-85bd0ba1ff9875798fad94218b627ea9f768f3c3.zip | |
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>
Diffstat (limited to 'arch/arm64/include/asm')
| -rw-r--r-- | arch/arm64/include/asm/kvm_host.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index ab46bc70add6..469de8acd06f 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -75,6 +75,9 @@ struct kvm_arch { /* Interrupt controller */ struct vgic_dist vgic; + + /* Mandated version of PSCI */ + u32 psci_version; }; #define KVM_NR_MEM_OBJS 40 |