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From: Peter Maydell <peter.maydell@linaro.org>
To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: "Kevin Wolf" <kwolf@redhat.com>,
	"Anthony Liguori" <aliguori@amazon.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	"Rusty Russell" <rusty@rustcorp.com.au>,
	"Alexander Graf" <agraf@suse.de>,
	"QEMU Developers" <qemu-devel@nongnu.org>,
	"Juan Quintela" <quintela@redhat.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
	"Stefan Hajnoczi" <stefanha@redhat.com>,
	"Amit Shah" <amit.shah@redhat.com>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Andreas Färber" <afaerber@suse.de>,
	"Greg Kurz" <gkurz@linux.vnet.ibm.com>
Subject: Re: [Qemu-devel] [PATCH v8 00/20] virtio endian-ambivalent target
Date: Wed, 18 Jun 2014 13:53:15 +0100	[thread overview]
Message-ID: <CAFEAcA-N0QrFegG0RBCBh05ZWJJaYKLvUUnYDvR8uNArZp8btQ@mail.gmail.com> (raw)
In-Reply-To: <20140618103814.GG14030@stefanha-thinkpad.redhat.com>

On 18 June 2014 11:38, Stefan Hajnoczi <stefanha@gmail.com> wrote:
> What bothers me is that real hardware can't do this.

Real hardware doesn't have "endianness matches guest CPU endianness"
semantics, which is what the virtio spec mandates...

> Given that VIRTIO
> 1.0 is always little-endian I guess this is just a temporary hack for
> ppc little-endian.  Would be nice to add a comment so it's clear why
> this approach is being taken instead of a cleaner solution.

Also for ARM big-endian, and indeed for any CPU with runtime
configurable endianness that wants to use the kernel virtio
drivers that exist in the real world rather than the theoretical
future ones that might some day be written for the 1.0 virtio
spec...

thanks
-- PMM

  parent reply	other threads:[~2014-06-18 12:53 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-13 11:18 [Qemu-devel] [PATCH v8 00/20] virtio endian-ambivalent target Greg Kurz
2014-06-13 11:18 ` [Qemu-devel] [PATCH v8 01/20] virtio-serial: don't migrate the config space Greg Kurz
2014-06-13 11:33   ` Alexander Graf
2014-06-19 10:40   ` Amit Shah
2014-06-19 11:17     ` Greg Kurz
2014-06-19 11:32   ` Michael S. Tsirkin
2014-06-13 11:19 ` [Qemu-devel] [PATCH v8 02/20] virtio: introduce device specific migration calls Greg Kurz
2014-06-13 11:19 ` [Qemu-devel] [PATCH v8 03/20] virtio-net: implement per-device " Greg Kurz
2014-06-13 11:19 ` [Qemu-devel] [PATCH v8 04/20] virtio-blk: " Greg Kurz
2014-06-13 11:20 ` [Qemu-devel] [PATCH v8 05/20] virtio-serial: " Greg Kurz
2014-06-13 11:20 ` [Qemu-devel] [PATCH v8 06/20] virtio-balloon: " Greg Kurz
2014-06-13 11:21 ` [Qemu-devel] [PATCH v8 07/20] virtio-rng: " Greg Kurz
2014-06-13 11:21 ` [Qemu-devel] [PATCH v8 08/20] virtio: add subsections to the migration stream Greg Kurz
2014-06-13 11:21 ` [Qemu-devel] [PATCH v8 09/20] exec: introduce target_words_bigendian() helper Greg Kurz
2014-06-13 11:41   ` Alexander Graf
2014-06-13 12:05     ` Greg Kurz
2014-06-13 11:22 ` [Qemu-devel] [PATCH v8 10/20] cpu: introduce CPUClass::virtio_is_big_endian() Greg Kurz
2014-06-13 11:42   ` Alexander Graf
2014-06-13 12:08     ` Greg Kurz
2014-06-13 11:23 ` [Qemu-devel] [PATCH v8 11/20] virtio: add endian-ambivalent support to VirtIODevice Greg Kurz
2014-06-13 11:46   ` Alexander Graf
2014-06-13 12:14     ` Greg Kurz
2014-06-13 12:41       ` Alexander Graf
2014-06-13 12:52         ` Greg Kurz
2014-06-13 11:23 ` [Qemu-devel] [PATCH v8 12/20] virtio: memory accessors for endian-ambivalent targets Greg Kurz
2014-06-13 11:24 ` [Qemu-devel] [PATCH v8 13/20] virtio: allow byte swapping for vring Greg Kurz
2014-06-13 11:24 ` [Qemu-devel] [PATCH v8 14/20] virtio-net: use virtio wrappers to access headers Greg Kurz
2014-06-13 11:52   ` Alexander Graf
2014-06-13 12:24     ` Cedric Le Goater
2014-06-13 12:40       ` Greg Kurz
2014-06-13 11:24 ` [Qemu-devel] [PATCH v8 15/20] virtio-balloon: use virtio wrappers to access page frame numbers Greg Kurz
2014-06-13 11:24 ` [Qemu-devel] [PATCH v8 16/20] virtio-blk: use virtio wrappers to access headers Greg Kurz
2014-06-13 11:24 ` [Qemu-devel] [PATCH v8 17/20] virtio-scsi: " Greg Kurz
2014-06-19 15:05   ` Greg Kurz
2014-06-20  8:24   ` Paolo Bonzini
2014-06-20  8:33     ` Greg Kurz
2014-06-13 11:25 ` [Qemu-devel] [PATCH v8 18/20] virtio-serial-bus: " Greg Kurz
2014-06-13 11:25 ` [Qemu-devel] [PATCH v8 19/20] virtio-9p: " Greg Kurz
2014-06-13 11:26 ` [Qemu-devel] [PATCH v8 20/20] target-ppc: enable virtio endian ambivalent support Greg Kurz
2014-06-13 11:56 ` [Qemu-devel] [PATCH v8 00/20] virtio endian-ambivalent target Alexander Graf
2014-06-16 15:07   ` Greg Kurz
2014-06-16 16:53     ` Amit Shah
2014-06-17  7:36 ` Stefan Hajnoczi
2014-06-17  7:40   ` Alexander Graf
2014-06-18 10:38     ` Stefan Hajnoczi
2014-06-18 12:35       ` Greg Kurz
2014-06-18 15:12         ` Michael S. Tsirkin
2014-06-18 15:14           ` Alexander Graf
2014-06-18 15:26             ` Michael S. Tsirkin
2014-06-19  9:51         ` Stefan Hajnoczi
2014-06-18 12:53       ` Peter Maydell [this message]
2014-06-18 13:42         ` Michael S. Tsirkin
2014-06-18 14:28           ` Greg Kurz
2014-06-18 15:05             ` Michael S. Tsirkin
2014-06-18 15:35             ` Peter Maydell
2014-06-18 15:37               ` Alexander Graf
2014-06-18 15:40                 ` Peter Maydell
2014-06-18 15:41                   ` Alexander Graf

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