KVM: arm64: Use arm64_ftr_bits to sanitise ID register writes

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Rather than reinventing the wheel in KVM to do ID register sanitisation
we can rely on the work already done in the core kernel. Implement a
generalized sanitisation of ID registers based on the combination of the
arm64_ftr_bits definitions from the core kernel and (optionally) a set
of KVM-specific overrides.

This all amounts to absolutely nothing for now, but will be used in
subsequent changes to realize user-configurable ID registers.

Signed-off-by: Jing Zhang <jingzhangos@google.com>
Link: https://lore.kernel.org/r/20230609190054.1542113-8-oliver.upton@linux.dev
[Oliver: split off from monster patch, rewrote commit description,
 reworked RAZ handling, return EINVAL to userspace]
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

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Jing Zhang 2023-06-09 19:00:50 +00:00 • committed by Oliver Upton

parent 4733414690

commit 2e8bf0cbd0

3 changed files with 121 additions and 5 deletions

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1

arch/arm64/include/asm/cpufeature.h

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2

arch/arm64/kernel/cpufeature.c

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123

arch/arm64/kvm/sys_regs.c

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