linux-kernel - Re: [PATCH 3/3] virtio

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: <20151028022524.GE18467@suse.de>
Date:	Wed, 28 Oct 2015 11:25:24 +0900
From:	Joerg Roedel <jroedel@...e.de>
To:	Andy Lutomirski <luto@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Christoph Hellwig <hch@....de>, benh@...nel.crashing.org,
	KVM <kvm@...r.kernel.org>, dwmw2@...radead.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-s390 <linux-s390@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH 3/3] virtio_pci: Use the DMA API

On Wed, Oct 28, 2015 at 11:15:30AM +0900, Joerg Roedel wrote:
> Same here, you need to call the dma_sync* functions when passing data
> from/to the virtio-device.

Okay, forget about this comment. This patch only converts to
dma_coherent allocations, which don't need synchronization.

> I think a good test for that is to boot a virtio kvm-guest with
> swiotlb=force and see if it still works.

But this holds, Its a good way to test if your changes work with
bounce-buffering. Together with DMA_API_DEBUG you also see if your
specified dma_directions are right.



	Joerg

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/