From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
To: Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
Cc: Jens Axboe <axboe-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>,
jon.grimm-5C7GfCeVMHo@public.gmane.org,
brijesh.singh-5C7GfCeVMHo@public.gmane.org,
Konrad Rzeszutek Wilk
<konrad.wilk-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
Jason Wang <jasowang-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
"Michael S . Tsirkin"
<mst-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
jfehlig-IBi9RG/b67k@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
virtualization-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
linux-block-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
jroedel-l3A5Bk7waGM@public.gmane.org,
Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Subject: Re: [PATCH 2/5] swiotlb: Add is_swiotlb_active() function
Date: Thu, 24 Jan 2019 09:41:07 +0100 [thread overview]
Message-ID: <20190124084107.GA19441@lst.de> (raw)
In-Reply-To: <20190124082923.GI32526-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
On Thu, Jan 24, 2019 at 09:29:23AM +0100, Joerg Roedel wrote:
> > As I've just introduced and fixed a bug in this area in the current
> > cycle - I don't think no_iotlb_memory is what your want (and maybe
> > not useful at all): if the arch valls swiotlb_exit after previously
> > initializing a buffer it won't be set. You probably want to check
> > for non-zero io_tlb_start and/or io_tlb_end.
>
> Okay, but that requires that I also set io_tlb_start and friends back to
> zero in the failure path of swiotlb_init(). Otherwise it could be left
> non-zero in case swiotlb_init_with_tbl() returns an error.
Indeed, and we'll need to do that anyway as otherwise the dma mapping
path might cause problems similar to the one when swiotlb_exit is
called that I fixed.
next prev parent reply other threads:[~2019-01-24 8:41 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-23 16:30 [PATCH 0/5 v3] Fix virtio-blk issue with SWIOTLB Joerg Roedel
2019-01-23 16:30 ` [PATCH 1/5] swiotlb: Introduce swiotlb_max_mapping_size() Joerg Roedel
[not found] ` <20190123163049.24863-2-joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2019-01-23 21:28 ` Christoph Hellwig
2019-01-24 8:24 ` Joerg Roedel
2019-01-24 8:47 ` Christoph Hellwig
2019-01-23 16:30 ` [PATCH 2/5] swiotlb: Add is_swiotlb_active() function Joerg Roedel
2019-01-23 21:27 ` Christoph Hellwig
2019-01-24 8:29 ` Joerg Roedel
[not found] ` <20190124082923.GI32526-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2019-01-24 8:41 ` Christoph Hellwig [this message]
2019-01-24 15:00 ` Joerg Roedel
2019-01-28 17:19 ` Michael S. Tsirkin
2019-01-23 16:30 ` [PATCH 3/5] dma: Introduce dma_max_mapping_size() Joerg Roedel
2019-01-23 21:29 ` Christoph Hellwig
2019-01-23 16:30 ` [PATCH 4/5] virtio: Introduce virtio_max_dma_size() Joerg Roedel
2019-01-23 16:30 ` [PATCH 5/5] virtio-blk: Consider virtio_max_dma_size() for maximum segment size Joerg Roedel
2019-01-23 21:31 ` Christoph Hellwig
2019-01-23 22:25 ` Michael S. Tsirkin
2019-01-24 8:40 ` Joerg Roedel
2019-01-24 8:42 ` Christoph Hellwig
[not found] ` <20190124084221.GB19441-jcswGhMUV9g@public.gmane.org>
2019-01-24 9:51 ` Joerg Roedel
2019-01-28 8:05 ` Christoph Hellwig
2019-01-28 17:14 ` Michael S. Tsirkin
2019-01-29 7:38 ` Christoph Hellwig
2019-01-23 17:09 ` [PATCH 0/5 v3] Fix virtio-blk issue with SWIOTLB Konrad Rzeszutek Wilk
2019-01-23 18:51 ` Michael S. Tsirkin
2019-01-23 21:14 ` Konrad Rzeszutek Wilk
2019-01-28 15:20 ` Michael S. Tsirkin
[not found] ` <20190128101852-mutt-send-email-mst-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2019-01-28 15:53 ` Konrad Rzeszutek Wilk
-- strict thread matches above, loose matches on Subject: below --
2019-01-29 8:43 [PATCH 0/5 v4] " Joerg Roedel
2019-01-29 8:43 ` [PATCH 2/5] swiotlb: Add is_swiotlb_active() function Joerg Roedel
2019-01-29 17:12 ` Christoph Hellwig
2019-01-30 16:40 [PATCH 0/5 v5] Fix virtio-blk issue with SWIOTLB Joerg Roedel
2019-01-30 16:40 ` [PATCH 2/5] swiotlb: Add is_swiotlb_active() function Joerg Roedel
2019-01-31 16:33 [PATCH 0/5 v6] Fix virtio-blk issue with SWIOTLB Joerg Roedel
2019-01-31 16:34 ` [PATCH 2/5] swiotlb: Add is_swiotlb_active() function Joerg Roedel
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