arm64: KVM: Handle Set/Way CMOs as NOPs if FWB is present

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Set/Way handling is one of the ugliest corners of KVM. We shouldn't
have to handle that, but better safe than sorry.

Thankfully, FWB fixes this for us by not requiering any maintenance
(the guest is forced to use cacheable memory, no matter what it says,
and the whole system is garanteed to be cache coherent), which means
we don't have to emulate S/W CMOs, and don't have to track VM ops either.

We still have to trap S/W though, if only to prevent the guest from
doing something bad.

Reviewed-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

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Marc Zyngier 2018-05-17 11:05:08 +01:00

parent e48d53a91f

commit 09605e94c2

1 changed files with 10 additions and 1 deletions

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arch/arm64/kvm/sys_regs.c

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