linux-kernel - Re: [PATCH 0/5 v5] Fix virtio-blk issue with SWIOTLB

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Date:   Wed, 30 Jan 2019 18:11:48 +0000
From:   "Lendacky, Thomas" <Thomas.Lendacky@....com>
To:     Joerg Roedel <joro@...tes.org>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Christoph Hellwig <hch@....de>
CC:     Jens Axboe <axboe@...nel.dk>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "jfehlig@...e.com" <jfehlig@...e.com>,
        "Grimm, Jon" <Jon.Grimm@....com>,
        "Singh, Brijesh" <brijesh.singh@....com>,
        "jroedel@...e.de" <jroedel@...e.de>
Subject: Re: [PATCH 0/5 v5] Fix virtio-blk issue with SWIOTLB

On 1/30/19 10:40 AM, 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/
> 
> 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 v4 are:
> 
> 	- Added Reviewed-by tags from Christoph
> 
> 	- Added missing EXPORT_SYMBOL(_GPL) lines
> 
> Please review.

Looks good. Booted and tested using an SEV guest without any issues.

Tested-by: Tom Lendacky <thomas.lendacky@....com>

Thanks,
Tom

> 
> 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  | 16 ++++++++++++++++
>  include/linux/swiotlb.h      | 11 +++++++++++
>  include/linux/virtio.h       |  2 ++
>  kernel/dma/direct.c          | 12 ++++++++++++
>  kernel/dma/swiotlb.c         | 14 ++++++++++++++
>  8 files changed, 80 insertions(+), 4 deletions(-)
>