From: Christoph Hellwig <hch@lst.de>
To: Jason Wang <jasowang@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>,
"Michael S . Tsirkin" <mst@redhat.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
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, hch@lst.de
Subject: Re: [PATCH 0/3] Fix virtio-blk issue with SWIOTLB
Date: Mon, 14 Jan 2019 10:50:02 +0100 [thread overview]
Message-ID: <20190114095002.GA29874@lst.de> (raw)
In-Reply-To: <38bcbd46-674c-348a-cbd6-66bd431e986a@redhat.com>
On Mon, Jan 14, 2019 at 05:41:56PM +0800, Jason Wang wrote:
>
> On 2019/1/11 下午5:15, Joerg Roedel wrote:
>> On Fri, Jan 11, 2019 at 11:29:31AM +0800, Jason Wang wrote:
>>> Just wonder if my understanding is correct IOMMU_PLATFORM must be set for
>>> all virtio devices under AMD-SEV guests?
>> Yes, that is correct. Emulated DMA can only happen on the SWIOTLB
>> aperture, because that memory is not encrypted. The guest bounces the
>> data then to its encrypted memory.
>>
>> Regards,
>>
>> Joerg
>
>
> Thanks, have you tested vhost-net in this case. I suspect it may not work
Which brings me back to my pet pevee that we need to take actions
that virtio uses the proper dma mapping API by default with quirks
for legacy cases. The magic bypass it uses is just causing problems
over problems.
next prev parent reply other threads:[~2019-01-14 9:50 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-10 13:44 [PATCH 0/3] Fix virtio-blk issue with SWIOTLB Joerg Roedel
[not found] ` <20190110134433.15672-1-joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2019-01-10 13:44 ` [PATCH 1/3] swiotlb: Export maximum allocation size Joerg Roedel
[not found] ` <20190110134433.15672-2-joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2019-01-10 17:02 ` Konrad Rzeszutek Wilk
2019-01-11 9:12 ` Joerg Roedel
2019-01-14 20:49 ` Konrad Rzeszutek Wilk
2019-01-14 21:59 ` Michael S. Tsirkin
2019-01-15 13:05 ` Christoph Hellwig
2019-01-10 13:44 ` [PATCH 2/3] virtio: Introduce virtio_max_dma_size() Joerg Roedel
2019-01-10 13:44 ` [PATCH 3/3] virtio-blk: Consider virtio_max_dma_size() for maximum segment size Joerg Roedel
2019-01-10 13:59 ` [PATCH 0/3] Fix virtio-blk issue with SWIOTLB Christoph Hellwig
2019-01-10 14:26 ` Joerg Roedel
2019-01-11 3:29 ` Jason Wang
2019-01-11 9:15 ` Joerg Roedel
2019-01-14 9:41 ` Jason Wang
2019-01-14 9:50 ` Christoph Hellwig [this message]
2019-01-14 12:41 ` Jason Wang
2019-01-14 18:20 ` Michael S. Tsirkin
2019-01-14 19:09 ` Singh, Brijesh
2019-01-14 19:12 ` Robin Murphy
2019-01-14 20:22 ` Christoph Hellwig
2019-01-14 20:29 ` Michael S. Tsirkin
2019-01-14 20:19 ` Christoph Hellwig
2019-01-14 20:48 ` Michael S. Tsirkin
2019-01-15 13:09 ` Christoph Hellwig
2019-01-15 8:37 ` Joerg Roedel
2019-01-15 13:20 ` Christoph Hellwig
2019-01-16 14:16 ` Michael S. Tsirkin
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