Re: [PATCH v5 2/3] arm/kvm: add support for MTE

[Richard Henderson]

On 2/6/23 03:32, Eric Auger wrote:
> > +void kvm_arm_enable_mte(Error **errp)
> > +{
> > +    static bool tried_to_enable = false;
> > +    Error *mte_migration_blocker = NULL;
> can't you make the mte_migration_blocker static instead?
>
> > +    int ret;
> > +
> > +    if (tried_to_enable) {
> > +        /*
> > +         * MTE on KVM is enabled on a per-VM basis (and retrying doesn't make
> > +         * sense), and we only want a single migration blocker as well.
> > +         */
> > +        return;
> > +    }
> > +    tried_to_enable = true;
> > +
> > +    if ((ret = kvm_vm_enable_cap(kvm_state, KVM_CAP_ARM_MTE, 0))) {
> > +        error_setg_errno(errp, -ret, "Failed to enable KVM_CAP_ARM_MTE");
> > +        return;
> > +    }
> > +
> > +    /* TODO: add proper migration support with MTE enabled */
> > +    error_setg(&mte_migration_blocker,
> > +               "Live migration disabled due to MTE enabled");

Making the blocker static wouldn't stop multiple errors from kvm_vm_enable_cap.


r~