Re: [Xen-devel] [PATCH v4 3/3] VT-d: Fix vt-d Device-TLB flush timeout issue.

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 26.01.16 at 14:47, <quan.xu@xxxxxxxxx> wrote:
> As you mentioned , I simply need to consult the bitmap along with the domain 
> ID array.
> 
> +If ( test_bit(did, iommu->domid_bitmap) && iommu->domid_map[did] >= 0 )
> +   d = rcu_lock_domain_by_id(iommu->domid_map[did]);
> 
> Is it right now?

Mostly, except that I don't understand the >= 0 part.

> At first, I am open for any solution.
> pcidevs_lock is quite a big lock. For this point, it looks much better to 
> add a new flag to delay hiding device.
> I am also afraid that it may raise further security issues.

Well, I'd say just go and see which one turns out to be less
cumbersome and/or less intrusive.

Jan


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