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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190111091502.GC5825@8bytes.org>
Date:   Fri, 11 Jan 2019 10:15:02 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Jason Wang <jasowang@...hat.com>
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 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