Commit 09605e94 authored May 17, 2018 by Marc Zyngier

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



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>

parent e48d53a9

arch/arm64/kvm/sys_regs.c

+10 −1

Original line number	Diff line number	Diff line
		@@ -194,7 +194,16 @@ static bool access_dcsw(struct kvm_vcpu *vcpu,
		if (!p->is_write)
		return read_from_write_only(vcpu, p, r);

		/*
		* Only track S/W ops if we don't have FWB. It still indicates
		* that the guest is a bit broken (S/W operations should only
		* be done by firmware, knowing that there is only a single
		* CPU left in the system, and certainly not from non-secure
		* software).
		*/
		if (!cpus_have_const_cap(ARM64_HAS_STAGE2_FWB))
		kvm_set_way_flush(vcpu);

		return true;
		}

Admin message