linux-kernel - Re: [virtio-dev] [PATCH 2/2] drm/virtio: add iommu support.

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Message-ID: <20180921054752.gjeaznoboqf2giit@sirius.home.kraxel.org>
Date:   Fri, 21 Sep 2018 07:47:52 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Jiandi An <jiandi@....com>
Cc:     Dave Airlie <airlied@...il.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "virtio-dev@...ts.oasis-open.org" <virtio-dev@...ts.oasis-open.org>,
        Dave Airlie <airlied@...ux.ie>,
        "open list:VIRTIO CORE, NET..." 
        <virtualization@...ts.linux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        "Singh, Brijesh" <brijesh.singh@....com>
Subject: Re: [virtio-dev] [PATCH 2/2] drm/virtio: add iommu support.

  Hi,

> > Just pass it down, the call sites all know it (see patch just sent).
> 
> Tested that patch you sent.  Together with this patch it also resolves
> the virtio gpu graphical display issue for SEV guest.

Cool.  Can you ack or review the patch so I can commit it?

> Is there a way to optimize the dma_sync_sg to only sync on the pages
> being updated instead of all the pages in the obj sgl list every time?

Well, the rectangle is passed to virtio_gpu_cmd_transfer_to_host_2d, so
it should be possible to figure which pages are affected and trim the
scatter list accordingly.

cheers,
  Gerd