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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

  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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