Re: [Xen-devel] [PATCH v2 1/5] IOMMU: make page table population preemptible

[Tim Deegan <tim@xxxxxxx>]

At 13:59 +0000 on 13 Dec (1386939579), Jan Beulich wrote:
> Since this can take an arbitrary amount of time, the rooting domctl as
> well as all involved code must become aware of this requiring a
> continuation.
> 
> The subject domain's rel_mem_list is being (ab)used for this, in a way
> similar to and compatible with broken page offlining.
> 
> Further, operations get slightly re-ordered in assign_device(): IOMMU
> page tables now get set up _before_ the first device gets assigned, at
> once closing a small timing window in which the guest may already see
> the device but wouldn't be able to access it.
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Acked-by: Tim Deegan <tim@xxxxxxx>

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel