From: Halil Pasic <pasic@linux.ibm.com>
To: Cornelia Huck <cohuck@redhat.com>
Cc: "Jason J. Herne" <jjherne@linux.ibm.com>,
linux-s390@vger.kernel.org, Thomas Huth <thuth@redhat.com>,
Claudio Imbrenda <imbrenda@linux.ibm.com>,
kvm@vger.kernel.org, Sebastian Ott <sebott@linux.ibm.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Farhan Ali <alifm@linux.ibm.com>,
Eric Farman <farman@linux.ibm.com>,
virtualization@lists.linux-foundation.org,
Christoph Hellwig <hch@infradead.org>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Michael Mueller <mimu@linux.ibm.com>,
Viktor Mihajlovski <mihajlov@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Janosch Frank <frankja@linux.ibm.com>
Subject: Re: [PATCH 06/10] s390/cio: add basic protected virtualization support
Date: Thu, 16 May 2019 15:42:45 +0200 [thread overview]
Message-ID: <20190516154245.4a0a84f7.pasic@linux.ibm.com> (raw)
In-Reply-To: <20190516083228.0cc5b489.cohuck@redhat.com>
On Thu, 16 May 2019 08:32:28 +0200
Cornelia Huck <cohuck@redhat.com> wrote:
> On Wed, 15 May 2019 23:08:17 +0200
> Halil Pasic <pasic@linux.ibm.com> wrote:
>
> > On Tue, 14 May 2019 10:47:34 -0400
> > "Jason J. Herne" <jjherne@linux.ibm.com> wrote:
>
> > > Are we
> > > worried that virtio data structures are going to be a burden on the 31-bit address space?
> > >
> > >
> >
> > That is a good question I can not answer. Since it is currently at least
> > a page per queue (because we use dma direct, right Mimu?), I am concerned
> > about this.
> >
> > Connie, what is your opinion?
>
> Yes, running into problems there was one of my motivations for my
> question. I guess it depends on the number of devices and how many
> queues they use. The problem is that it affects not only protected virt
> guests, but all guests.
>
Unless things are about to change only devices that have
VIRTIO_F_IOMMU_PLATFORM are affected. So it does not necessarily affect
not protected virt guests. (With prot virt we have to use
VIRTIO_F_IOMMU_PLATFORM.)
If it were not like this, I would be much more worried.
@Mimu: Could you please discuss this problem with the team? It might be
worth considering to go back to the design of the RFC (i.e. cio/ccw stuff
allocated from a common cio dma pool which gives you 31 bit addressable
memory, and 64 bit dma mask for a ccw device of a virtio device).
Regards,
Halil
next prev parent reply other threads:[~2019-05-16 13:42 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-26 18:32 [PATCH 00/10] s390: virtio: support protected virtualization Halil Pasic
2019-04-26 18:32 ` [PATCH 01/10] virtio/s390: use vring_create_virtqueue Halil Pasic
[not found] ` <20190503111724.70c6ec37.cohuck@redhat.com>
2019-05-03 20:04 ` Michael S. Tsirkin
2019-05-04 14:03 ` Halil Pasic
2019-05-05 11:15 ` Cornelia Huck
2019-05-07 13:58 ` Christian Borntraeger
2019-05-08 20:12 ` Halil Pasic
2019-05-10 14:07 ` Cornelia Huck
2019-05-12 16:47 ` Michael S. Tsirkin
2019-05-13 9:52 ` Cornelia Huck
2019-05-13 12:27 ` Michael Mueller
2019-05-13 12:29 ` Cornelia Huck
2019-04-26 18:32 ` [PATCH 02/10] virtio/s390: DMA support for virtio-ccw Halil Pasic
2019-04-26 18:32 ` [PATCH 03/10] virtio/s390: enable packed ring Halil Pasic
[not found] ` <20190503114450.2512b121.cohuck@redhat.com>
2019-05-05 15:13 ` Thomas Huth
2019-04-26 18:32 ` [PATCH 04/10] s390/mm: force swiotlb for protected virtualization Halil Pasic
2019-04-26 19:27 ` Christoph Hellwig
2019-04-29 13:59 ` Halil Pasic
2019-04-29 14:05 ` Christian Borntraeger
2019-05-13 12:50 ` Michael Mueller
2019-05-08 13:15 ` Claudio Imbrenda
2019-05-09 22:34 ` Halil Pasic
2019-05-15 14:15 ` Michael Mueller
[not found] ` <ad23f5e7-dc78-04af-c892-47bbc65134c6@linux.ibm.com>
2019-05-09 18:05 ` Jason J. Herne
2019-05-10 7:49 ` Claudio Imbrenda
2019-04-26 18:32 ` [PATCH 05/10] s390/cio: introduce DMA pools to cio Halil Pasic
2019-05-08 13:18 ` Sebastian Ott
2019-05-08 21:22 ` Halil Pasic
2019-05-09 8:40 ` Sebastian Ott
2019-05-09 10:11 ` Cornelia Huck
2019-05-09 22:11 ` Halil Pasic
2019-05-10 14:10 ` Cornelia Huck
2019-05-12 18:22 ` Halil Pasic
2019-05-13 13:29 ` Cornelia Huck
2019-05-15 17:12 ` Halil Pasic
2019-05-16 6:13 ` Cornelia Huck
2019-05-16 13:59 ` Sebastian Ott
2019-05-20 12:13 ` Halil Pasic
2019-05-21 8:46 ` Michael Mueller
2019-05-22 12:07 ` Sebastian Ott
2019-05-22 22:12 ` Halil Pasic
2019-05-23 15:17 ` Halil Pasic
2019-04-26 18:32 ` [PATCH 06/10] s390/cio: add basic protected virtualization support Halil Pasic
2019-05-08 13:46 ` Sebastian Ott
2019-05-08 13:54 ` Christoph Hellwig
2019-05-08 21:08 ` Halil Pasic
2019-05-09 8:52 ` Sebastian Ott
2019-05-08 14:23 ` Pierre Morel
2019-05-13 9:41 ` Cornelia Huck
2019-05-14 14:47 ` Jason J. Herne
2019-05-15 21:08 ` Halil Pasic
2019-05-16 6:32 ` Cornelia Huck
2019-05-16 13:42 ` Halil Pasic [this message]
2019-05-16 13:54 ` Cornelia Huck
2019-05-15 20:51 ` Halil Pasic
2019-05-16 6:29 ` Cornelia Huck
2019-05-18 18:11 ` Halil Pasic
2019-05-20 10:21 ` Cornelia Huck
2019-05-20 12:34 ` Halil Pasic
2019-05-20 13:43 ` Cornelia Huck
2019-04-26 18:32 ` [PATCH 07/10] s390/airq: use DMA memory for adapter interrupts Halil Pasic
2019-05-08 13:58 ` Sebastian Ott
2019-05-09 11:37 ` Cornelia Huck
2019-05-13 12:59 ` Cornelia Huck
2019-04-26 18:32 ` [PATCH 08/10] virtio/s390: add indirection to indicators access Halil Pasic
2019-05-08 14:31 ` Pierre Morel
2019-05-09 12:01 ` Pierre Morel
2019-05-09 18:26 ` Halil Pasic
2019-05-10 7:43 ` Pierre Morel
2019-05-10 11:54 ` Halil Pasic
2019-05-10 15:36 ` Pierre Morel
2019-05-13 10:15 ` Cornelia Huck
2019-05-16 15:24 ` Pierre Morel
2019-04-26 18:32 ` [PATCH 09/10] virtio/s390: use DMA memory for ccw I/O and classic notifiers Halil Pasic
2019-05-08 14:46 ` Pierre Morel
2019-05-09 13:30 ` Pierre Morel
2019-05-09 18:30 ` Halil Pasic
2019-05-13 13:54 ` Cornelia Huck
2019-04-26 18:32 ` [PATCH 10/10] virtio/s390: make airq summary indicators DMA Halil Pasic
2019-05-08 15:11 ` Pierre Morel
2019-05-15 13:33 ` Michael Mueller
2019-05-15 17:23 ` Halil Pasic
2019-05-13 12:20 ` Cornelia Huck
2019-05-15 13:43 ` Michael Mueller
2019-05-15 13:50 ` Cornelia Huck
2019-05-15 17:18 ` Halil Pasic
[not found] ` <20190503115511.17a1f6d1.cohuck@redhat.com>
2019-05-03 13:33 ` [PATCH 00/10] s390: virtio: support protected virtualization Cornelia Huck
2019-05-04 13:58 ` Halil Pasic
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