Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Tue, 5 Feb 2019 15:52:38 -0500
From:   "Michael S. Tsirkin" <mst@redhat.com>
To:     Joerg Roedel <joro@8bytes.org>
Cc:     Jason Wang <jasowang@redhat.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
        virtualization@lists.linux-foundation.org,
        linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
        iommu@lists.linux-foundation.org, jfehlig@suse.com,
        jon.grimm@amd.com, brijesh.singh@amd.com, jroedel@suse.de,
        Thomas.Lendacky@amd.com
Subject: Re: [PATCH 0/5 v6] Fix virtio-blk issue with SWIOTLB
Message-ID: <20190205155133-mutt-send-email-mst@kernel.org>
References: <20190131163403.11363-1-joro@8bytes.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20190131163403.11363-1-joro@8bytes.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Thu, Jan 31, 2019 at 05:33:58PM +0100, Joerg Roedel wrote:
> Hi,
> 
> here is the next version of this patch-set. Previous
> versions can be found here:
> 
> 	V1: https://lore.kernel.org/lkml/20190110134433.15672-1-joro@8bytes.org/
> 
> 	V2: https://lore.kernel.org/lkml/20190115132257.6426-1-joro@8bytes.org/
> 
> 	V3: https://lore.kernel.org/lkml/20190123163049.24863-1-joro@8bytes.org/
> 
> 	V4: https://lore.kernel.org/lkml/20190129084342.26030-1-joro@8bytes.org/
> 
> 	V5: https://lore.kernel.org/lkml/20190130164007.26497-1-joro@8bytes.org/
> 
> The problem solved here is a limitation of the SWIOTLB implementation,
> which does not support allocations larger than 256kb.  When the
> virtio-blk driver tries to read/write a block larger than that, the
> allocation of the dma-handle fails and an IO error is reported.
> 
> Changes to v5 are:
> 
> 	- Changed patch 3 to uninline dma_max_mapping_size()

And this lead to problems reported by kbuild :(

BTW when you repost, can I ask you to pls include
the version in all patches? Both --subject-prefix
and -v flags to git format-patch will do this for you.


> Please review.
> 
> Thanks,
> 
> 	Joerg
> 
> Joerg Roedel (5):
>   swiotlb: Introduce swiotlb_max_mapping_size()
>   swiotlb: Add is_swiotlb_active() function
>   dma: Introduce dma_max_mapping_size()
>   virtio: Introduce virtio_max_dma_size()
>   virtio-blk: Consider virtio_max_dma_size() for maximum segment size
> 
>  Documentation/DMA-API.txt    |  8 ++++++++
>  drivers/block/virtio_blk.c   | 10 ++++++----
>  drivers/virtio/virtio_ring.c | 11 +++++++++++
>  include/linux/dma-mapping.h  |  8 ++++++++
>  include/linux/swiotlb.h      | 11 +++++++++++
>  include/linux/virtio.h       |  2 ++
>  kernel/dma/direct.c          | 11 +++++++++++
>  kernel/dma/mapping.c         | 14 ++++++++++++++
>  kernel/dma/swiotlb.c         | 14 ++++++++++++++
>  9 files changed, 85 insertions(+), 4 deletions(-)
> 
> -- 
> 2.17.1