linux-kernel - Re: [PATCH v3 0/2] iommu/vt-d: Fix mapping PSI missing for iommu

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Date:   Fri, 4 May 2018 15:32:00 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Peter Xu <peterx@...hat.com>,
        Linux IOMMU Mailing List <iommu@...ts.linux-foundation.org>,
        linux-kernel@...r.kernel.org
Cc:     Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jintack Lim <jintack@...columbia.edu>,
        Alexander Witte <alexander.witte@...canada.com>
Subject: Re: [PATCH v3 0/2] iommu/vt-d: Fix mapping PSI missing for
 iommu_map()

Hi,

On 05/04/2018 10:34 AM, Peter Xu wrote:
> v3:
> - drop the pr_debug patch [Joerg]
> - rename all the subjects as suggested [Joerg]
> - rebase
>
> v2:
> - cc correct people and iommu list
>
> (PSI stands for: Page Selective Invalidations)
>
> Intel IOMMU has the caching mode to ease emulation of the device.
> When that bit is set, we need to send PSIs even for newly mapped
> pages.  However current driver is not fully obey the rule.  E.g.,
> iommu_map() API will only do the mapping but it never sent the PSIs
> before.  That can be problematic to emulated IOMMU devices since
> they'll never be able to build up the shadow page tables if without
> such information.  This patchset tries to fix the problem.
>
> Patch 1 introduces a helper to notify the MAP PSIs.
>
> Patch 2 fixes the real problem by making sure every domain mapping
> will trigger the MAP PSI notifications.
>
> Without the patchset, nested device assignment (assign one device
> firstly to L1 guest, then to L2 guest) won't work for QEMU.  After
> applying the patchset, it works.
>
> Please review.  Thanks.

Both patches look good to me.

Best regards,
Lu Baolu

>
> Peter Xu (2):
>   iommu/vt-d: Introduce __mapping_notify_one()
>   iommu/vt-d: Fix iotlb psi missing for mappings
>
>  drivers/iommu/intel-iommu.c | 65 ++++++++++++++++++++++++++-----------
>  1 file changed, 46 insertions(+), 19 deletions(-)
>