From: Paolo Bonzini <pbonzini@redhat.com>
To: Jan Kiszka <jan.kiszka@siemens.com>,
"Michael S. Tsirkin" <mst@redhat.com>
Cc: "linux-s390@vger.kernel.org" <linux-s390@vger.kernel.org>,
xen-devel <Xen-devel@lists.xen.org>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Andy Lutomirski <luto@amacapital.net>,
Christian Borntraeger <borntraeger@de.ibm.com>,
"linux390@de.ibm.com" <linux390@de.ibm.com>,
Linux Virtualization <virtualization@lists.linux-foundation.org>
Subject: Re: [PATCH v4 0/4] virtio: Clean up scatterlists and use the DMA API
Date: Tue, 28 Jul 2015 19:15:27 +0200 [thread overview]
Message-ID: <55B7B8AF.5060603@redhat.com> (raw)
In-Reply-To: <55B7B105.50200@siemens.com>
On 28/07/2015 18:42, Jan Kiszka wrote:
> > On the other hand interrupt remapping is absolutely necessary for
> > production use, hence my point that x86 does not promise API stability.
>
> Well, we currently implement the features that the Q35 used to expose.
> Adding interrupt remapping will require a new chipset and/or a hack
> switch to ignore compatibility.
Isn't the VT-d register space separate from other Q35 features and
backwards-compatible? You could even add it to PIIX in theory just by
adding a DMAR.
It's not like for example SMRAM, where the registers are in the
northbridge configuration space and move around in every chipset generation.
> > ("Any kind of stability" actually didn't include crashes; those are not
> > expected :))
> >
> > The Google patches for userspace PIC and IOAPIC are proceeding well, so
> > hopefully we can have interrupt remapping soon.
>
> If the day had 48 hours... I'd love to look into this, first adding QEMU
> support for the new irqchip architecture.
I hope I can squeeze in some time for that... Google also had an intern
that was looking at it.
Paolo
next prev parent reply other threads:[~2015-07-28 17:15 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-28 1:08 [PATCH v4 0/4] virtio: Clean up scatterlists and use the DMA API Andy Lutomirski
2015-07-28 7:05 ` Christian Borntraeger
2015-07-28 8:16 ` Paolo Bonzini
2015-07-28 10:12 ` Benjamin Herrenschmidt
2015-07-28 12:46 ` Paolo Bonzini
2015-07-28 13:06 ` Michael S. Tsirkin
2015-07-28 13:11 ` Jan Kiszka
2015-07-28 16:11 ` Andy Lutomirski
2015-07-28 16:44 ` Jan Kiszka
2015-07-28 17:10 ` Andy Lutomirski
2015-07-28 17:17 ` Jan Kiszka
2015-07-28 18:22 ` Andy Lutomirski
2015-07-28 19:06 ` Jan Kiszka
2015-07-28 19:24 ` Andy Lutomirski
2015-07-28 19:33 ` Jan Kiszka
2015-07-28 21:16 ` Andy Lutomirski
2015-07-28 22:43 ` Andy Lutomirski
2015-07-28 23:21 ` Benjamin Herrenschmidt
2015-07-28 23:33 ` Andy Lutomirski
2015-07-29 0:36 ` Benjamin Herrenschmidt
2015-07-29 0:47 ` Andy Lutomirski
2015-07-29 0:54 ` Benjamin Herrenschmidt
2015-07-29 8:17 ` Paolo Bonzini
2015-07-29 8:20 ` Jan Kiszka
2015-07-29 9:21 ` Benjamin Herrenschmidt
2015-07-29 8:07 ` Jan Kiszka
2015-07-28 16:36 ` Paolo Bonzini
2015-07-28 16:42 ` Jan Kiszka
2015-07-28 17:15 ` Paolo Bonzini [this message]
2015-07-28 17:19 ` Jan Kiszka
2015-07-28 17:31 ` Paolo Bonzini
2015-07-28 13:08 ` Michael S. Tsirkin
-- strict thread matches above, loose matches on Subject: below --
2014-09-01 17:39 Andy Lutomirski
2014-09-01 22:16 ` Benjamin Herrenschmidt
2014-09-02 5:55 ` Andy Lutomirski
2014-09-02 20:53 ` Benjamin Herrenschmidt
2014-09-02 20:56 ` Konrad Rzeszutek Wilk
2014-09-02 21:08 ` Benjamin Herrenschmidt
2014-09-02 21:37 ` Andy Lutomirski
2014-09-02 22:10 ` Benjamin Herrenschmidt
2014-09-02 23:11 ` Andy Lutomirski
2014-09-02 23:20 ` Benjamin Herrenschmidt
2014-09-02 23:42 ` Andy Lutomirski
2014-09-03 0:25 ` Benjamin Herrenschmidt
2014-09-03 0:32 ` Andy Lutomirski
2014-09-03 0:43 ` Benjamin Herrenschmidt
2014-09-04 2:03 ` Andy Lutomirski
2014-09-03 7:47 ` Paolo Bonzini
2014-09-03 7:52 ` Andy Lutomirski
2014-09-03 8:01 ` Paolo Bonzini
2014-09-03 8:05 ` Benjamin Herrenschmidt
2014-09-03 12:11 ` Paolo Bonzini
2014-09-03 15:07 ` Andy Lutomirski
2014-09-03 15:11 ` Paolo Bonzini
2014-09-03 16:39 ` Michael S. Tsirkin
2014-09-03 20:38 ` Andy Lutomirski
2014-09-03 7:43 ` Paolo Bonzini
2014-09-03 6:42 ` Rusty Russell
2014-09-03 7:50 ` Andy Lutomirski
2014-09-05 2:31 ` Rusty Russell
2014-09-05 2:57 ` Andy Lutomirski
2014-09-05 5:20 ` Benjamin Herrenschmidt
2014-09-05 7:33 ` Christian Borntraeger
2014-09-10 15:36 ` Christopher Covington
2014-09-10 16:15 ` Andy Lutomirski
2014-09-05 5:16 ` Benjamin Herrenschmidt
2014-09-14 8:58 ` Michael S. Tsirkin
2014-09-03 12:51 ` Michael S. Tsirkin
2014-09-05 2:32 ` Rusty Russell
2014-09-05 3:06 ` Andy Lutomirski
2014-09-02 21:10 ` Michael S. Tsirkin
2014-09-02 21:49 ` Andy Lutomirski
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