KVM: arm64: Enable access to sanitized CPU features at EL2

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Introduce the infrastructure in KVM enabling to copy CPU feature
registers into EL2-owned data-structures, to allow reading sanitised
values directly at EL2 in nVHE.

Given that only a subset of these features are being read by the
hypervisor, the ones that need to be copied are to be listed under
<asm/kvm_cpufeature.h> together with the name of the nVHE variable that
will hold the copy. This introduces only the infrastructure enabling
this copy. The first users will follow shortly.

Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210319100146.1149909-14-qperret@google.com

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Quentin Perret 2021-03-19 10:01:21 +00:00 • committed by Marc Zyngier

parent 8e17c66249

commit 7a440cc783

5 changed files with 59 additions and 0 deletions

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1

arch/arm64/include/asm/cpufeature.h

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arch/arm64/include/asm/kvm_cpufeature.h

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arch/arm64/include/asm/kvm_host.h

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arch/arm64/kernel/cpufeature.c

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arch/arm64/kvm/sys_regs.c

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