KVM: arm64: Allow userspace to change ID_AA64PFR0_EL1

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Allow userspace to change the guest-visible value of the register with
some severe limitation:

 - No changes to features not virtualized by KVM (AMU, MPAM, RAS)

 - Short of full GICv2 emulation in kernel, hiding GICv3 from the guest
   makes absolutely no sense.

 - FP is effectively assumed for KVM VMs.

Signed-off-by: Jing Zhang <jingzhangos@google.com>
[oliver: restrict features that are illogical to change]
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231003230408.3405722-9-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

...

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Jing Zhang 2023-10-03 23:04:04 +00:00 • committed by Oliver Upton

parent d5a32b60dc

commit 8cfd5be88e

1 changed files with 7 additions and 1 deletions

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arch/arm64/kvm/sys_regs.c

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