linux-kernel - Re: [PATCH 0/3] Fix virtio-blk issue with SWIOTLB

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Message-ID: <38bcbd46-674c-348a-cbd6-66bd431e986a@redhat.com>
Date:   Mon, 14 Jan 2019 17:41:56 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     "Michael S . Tsirkin" <mst@...hat.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Jens Axboe <axboe@...nel.dk>,
        virtualization@...ts.linux-foundation.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, jfehlig@...e.com,
        jon.grimm@....com, brijesh.singh@....com, hch@....de
Subject: Re: [PATCH 0/3] Fix virtio-blk issue with SWIOTLB


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