KVM: arm64: Reject attempts to set invalid debug arch version

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The debug architecture is mandatory in ARMv8, so KVM should not allow
userspace to configure a vCPU with less than that. Of course, this isn't
handled elegantly by the generic ID register plumbing, as the respective
ID register fields have a nonzero starting value.

Add an explicit check for debug versions less than v8 of the
architecture.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231003230408.3405722-5-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

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Oliver Upton 2023-10-03 23:04:00 +00:00

parent 5a23e5c7cb

commit a9bc4a1c1e

1 changed files with 29 additions and 3 deletions

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32

arch/arm64/kvm/sys_regs.c

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