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kvm: arm/arm64: vgic-v3: Tighten synchronization for guests using v2 on v3

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On guest exit, and when using GICv2 on GICv3, we use a dsb(st) to
force synchronization between the memory-mapped guest view and
the system-register view that the hypervisor uses.

This is incorrect, as the spec calls out the need for "a DSB whose
required access type is both loads and stores with any Shareability
attribute", while we're only synchronizing stores.

We also lack an isb after the dsb to ensure that the latter has
actually been executed before we start reading stuff from the sysregs.

The fix is pretty easy: turn dsb(st) into dsb(sy), and slap an isb()
just after.

Cc: stable@vger.kernel.org
Fixes: f68d2b1b73 ("arm64: KVM: Implement vgic-v3 save/restore")
Acked-by: Christoffer Dall <cdall@kernel.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2018-03-06 21:44:37 +00:00
parent 16ca6a607d
commit 27e91ad1e7
1 changed files with 2 additions and 1 deletions
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3
virt/kvm/arm/hyp/vgic-v3-sr.c
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@ -215,7 +215,8 @@ void __hyp_text __vgic_v3_save_state(struct kvm_vcpu *vcpu)
* are now visible to the system register interface.
*/
if (!cpu_if->vgic_sre) {
dsb(st);
dsb(sy);
isb();
cpu_if->vgic_vmcr = read_gicreg(ICH_VMCR_EL2);
}