linux-kernel - Re: [PATCH v4 0/6] virtio core DMA API conversion

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Date:	Fri, 30 Oct 2015 10:57:37 +0100
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Andy Lutomirski <luto@...nel.org>, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>, sparclinux@...r.kernel.org
Cc:	Joerg Roedel <jroedel@...e.de>,
	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>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v4 0/6] virtio core DMA API conversion

Am 30.10.2015 um 02:09 schrieb Andy Lutomirski:
> This switches virtio to use the DMA API unconditionally.  I'm sure
> it breaks things, but it seems to work on x86 using virtio-pci, with
> and without Xen, and using both the modern 1.0 variant and the
> legacy variant.
> 
> This appears to work on native and Xen x86_64 using both modern and
> legacy virtio-pci.  It also appears to work on arm and arm64.
> 
> It definitely won't work as-is on s390x, and I haven't been able to
> test Christian's patches because I can't get virtio-ccw to work in
> QEMU at all.  I don't know what I'm doing wrong.


[...]
>   virtio-net: Stop doing DMA from the stack
> 
>  drivers/net/virtio_net.c           |  34 ++--
>  drivers/virtio/Kconfig             |   2 +-
>  drivers/virtio/virtio_mmio.c       |  67 ++-----
>  drivers/virtio/virtio_pci_common.h |   6 -
>  drivers/virtio/virtio_pci_legacy.c |  42 ++---
>  drivers/virtio/virtio_pci_modern.c |  61 ++-----
>  drivers/virtio/virtio_ring.c       | 348 ++++++++++++++++++++++++++++++-------

do you also have an untested patch for drivers/s390/virtio/* ?



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