From: Halil Pasic <pasic@linux.ibm.com>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: Thomas Huth <thuth@redhat.com>,
Boris Fiuczynski <fiuczy@linux.ibm.com>,
Janosch Frank <frankja@linux.ibm.com>,
Pierre Morel <pmorel@linux.ibm.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Cornelia Huck <cohuck@redhat.com>,
David Hildenbrand <david@redhat.com>,
qemu-devel@nongnu.org,
Christian Borntraeger <borntraeger@de.ibm.com>,
qemu-s390x@nongnu.org,
Viktor Mihajlovski <mihajlov@linux.ibm.com>,
Richard Henderson <rth@twiddle.net>
Subject: Re: [PATCH v2 1/1] virtio-ccw: auto-manage VIRTIO_F_IOMMU_PLATFORM if PV
Date: Wed, 10 Jun 2020 23:37:14 +0200 [thread overview]
Message-ID: <20200610233714.05174c93.pasic@linux.ibm.com> (raw)
In-Reply-To: <20200610042554.GD494336@umbus.fritz.box>
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On Wed, 10 Jun 2020 14:25:54 +1000
David Gibson <david@gibson.dropbear.id.au> wrote:
> > > I'm going to definitely have a good look at that. What I think special
> > > about s390 is that F_ACCESS_PLATFORM is hurting us because all IO needs
> > > to go through ZONE_DMA (this is a problem of the implementation that
> > > stemming form a limitation of the DMA API, upstream didn't let me
> > > fix it).
> >
> > My understanding is that power runs into similar issues, but I don't
> > know much about power, so I might be entirely wrong :)
>
> Sort of, but not to the same extent, I think.
I'm curious what are the ramifications of a misguided hotplug on POWER?
Does using F_ACCESS_PLATFORM when it isn't required have any
significant drawbacks, or are you fine to just go with the safe option?
Regards,
Halil
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next prev parent reply other threads:[~2020-06-10 21:39 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-14 22:11 [PATCH v2 1/1] virtio-ccw: auto-manage VIRTIO_F_IOMMU_PLATFORM if PV Halil Pasic
2020-05-20 12:16 ` Halil Pasic
2020-05-20 16:23 ` Michael S. Tsirkin
2020-05-22 21:04 ` Halil Pasic
2020-05-28 11:21 ` Cornelia Huck
2020-05-28 14:42 ` Janosch Frank
2020-05-28 18:49 ` Halil Pasic
2020-05-28 17:52 ` Halil Pasic
2020-06-05 23:32 ` Halil Pasic
2020-06-08 16:14 ` Cornelia Huck
2020-06-08 17:00 ` Halil Pasic
2020-06-09 6:44 ` Cornelia Huck
2020-06-09 9:41 ` Halil Pasic
2020-06-09 14:02 ` Pierre Morel
2020-06-09 15:47 ` Claudio Imbrenda
2020-06-09 16:05 ` Cornelia Huck
2020-06-09 16:41 ` Halil Pasic
2020-06-10 13:34 ` Halil Pasic
2020-06-09 16:28 ` Halil Pasic
2020-06-09 16:44 ` Michael S. Tsirkin
2020-06-10 4:31 ` David Gibson
2020-06-10 7:22 ` David Hildenbrand
2020-06-10 10:07 ` David Gibson
2020-06-10 10:24 ` David Hildenbrand
2020-06-10 13:00 ` Halil Pasic
2020-06-10 13:19 ` Viktor Mihajlovski
2020-06-10 14:00 ` David Hildenbrand
2020-06-19 0:36 ` David Gibson
2020-06-19 0:33 ` David Gibson
2020-06-10 13:15 ` Halil Pasic
2020-06-10 4:29 ` David Gibson
2020-06-10 13:57 ` Halil Pasic
2020-06-19 0:59 ` David Gibson
2020-06-09 16:41 ` Michael S. Tsirkin
2020-06-10 4:25 ` David Gibson
2020-06-10 21:37 ` Halil Pasic [this message]
2020-06-19 1:01 ` David Gibson
2020-06-08 16:53 ` Michael S. Tsirkin
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