From: David Gibson <david@gibson.dropbear.id.au>
To: groug@kaod.org, pair@us.ibm.com, qemu-devel@nongnu.org, clg@kaod.org
Cc: mst@redhat.com, aik@ozlabs.ru, paulus@samba.org,
mdroth@us.ibm.com, qemu-ppc@nongnu.org,
David Gibson <david@gibson.dropbear.id.au>
Subject: [PATCH v3 0/2] spapr: Use vIOMMU translation for virtio by default
Date: Thu, 5 Mar 2020 15:30:07 +1100 [thread overview]
Message-ID: <20200305043009.611636-1-david@gibson.dropbear.id.au> (raw)
Upcoming Secure VM support for pSeries machines introduces some
complications for virtio, since the transfer buffers need to be
explicitly shared so that the hypervisor can access them.
While it's not strictly speaking dependent on it, the fact that virtio
devices bypass normal platform IOMMU translation complicates the issue
on the guest side. Since there are some significan downsides to
bypassing the vIOMMU anyway, let's just disable that.
There's already a flag to do this in virtio, just turn it on by
default for forthcoming pseries machine types.
Any opinions on whether dropping support for the older guest kernels
is acceptable at this point?
Changes since v2:
* Rebase and improve some comments
Changes since v1:
* Added information on which guest kernel versions will no longer
work with these changes
* Use Michael Tsirkin's suggested better way of handling the machine
type change
David Gibson (2):
spapr: Disable legacy virtio devices for pseries-5.0 and later
spapr: Enable virtio iommu_platform=on by default
hw/ppc/spapr.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
--
2.24.1
next reply other threads:[~2020-03-05 4:31 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-05 4:30 David Gibson [this message]
2020-03-05 4:30 ` [PATCH v3 1/2] spapr: Disable legacy virtio devices for pseries-5.0 and later David Gibson
2020-03-05 10:31 ` Greg Kurz
2020-03-10 9:43 ` Greg Kurz
2020-03-10 9:57 ` Michael S. Tsirkin
2020-03-10 11:03 ` Michael S. Tsirkin
2020-03-10 12:24 ` Greg Kurz
2020-03-10 11:56 ` Daniel P. Berrangé
2020-03-11 0:58 ` David Gibson
2020-03-11 7:11 ` Michael S. Tsirkin
2020-03-12 1:14 ` David Gibson
2020-03-12 6:41 ` Michael S. Tsirkin
2020-03-05 4:30 ` [PATCH v3 2/2] spapr: Enable virtio iommu_platform=on by default David Gibson
2020-03-05 11:59 ` Greg Kurz
2020-03-10 10:43 ` Greg Kurz
2020-03-12 4:14 ` Alexey Kardashevskiy
2020-03-12 8:02 ` Greg Kurz
2020-03-10 11:43 ` Upstream QEMU guest support policy ? Re: [PATCH v3 0/2] spapr: Use vIOMMU translation for virtio " Daniel P. Berrangé
2020-03-11 1:12 ` David Gibson
2020-03-11 7:33 ` Michael S. Tsirkin
2020-03-12 1:10 ` David Gibson
2020-03-12 6:32 ` Michael S. Tsirkin
2020-03-16 3:06 ` David Gibson
2020-03-11 10:01 ` Daniel P. Berrangé
2020-03-11 11:48 ` Michael S. Tsirkin
2020-03-12 1:09 ` David Gibson
2020-03-12 1:08 ` David Gibson
2020-03-12 9:47 ` Daniel P. Berrangé
2020-03-11 17:19 ` Greg Kurz
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200305043009.611636-1-david@gibson.dropbear.id.au \
--to=david@gibson.dropbear.id.au \
--cc=aik@ozlabs.ru \
--cc=clg@kaod.org \
--cc=groug@kaod.org \
--cc=mdroth@us.ibm.com \
--cc=mst@redhat.com \
--cc=pair@us.ibm.com \
--cc=paulus@samba.org \
--cc=qemu-devel@nongnu.org \
--cc=qemu-ppc@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.