Re: [Xen-devel] [PATCH v2] x86/vtd: fix IOMMU share PT destruction path

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Wei Liu [mailto:wei.liu2@xxxxxxxxxx]
> Sent: Thursday, October 11, 2018 4:28 PM
> 
> On Tue, Oct 09, 2018 at 03:57:08PM +0100, Wei Liu wrote:
> > Commit 2916951c1 ("mm / iommu: include need_iommu() test in
> > iommu_use_hap_pt()") included need_iommu() in iommu_use_hap_pt
> and
> > 91d4eca7add ("mm / iommu: split need_iommu() into has_iommu_pt()
> and
> > need_iommu_pt_sync()") made things finer grain by spliting need_iommu
> > into three states.
> >
> > The destruction path can't use iommu_use_hap_pt because at the point
> > platform op is called, IOMMU is either already switched to or has
> > always been in disabled state, and the shared PT test would always be
> > false.
> >
> > Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> 
> Kevin, can you ack/nack this patch? Staging is currently blocked by a
> bug which is fixed by this patch.
> 

Sorry I thought I've sent the ack but looks not:

Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

Thanks
Kevin

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