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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 1/8] virtio_get_byteswap: function for endian-ambivalent targets using virtio.
Date: Mon, 12 Aug 2013 19:43:26 +1000	[thread overview]
Message-ID: <1376300606.32100.160.camel@pasglop> (raw)
In-Reply-To: <CAFEAcA-UU9UycEuWSVGZQkxCt4WbA3YqXxP4y5Tubh8kqib0Zw@mail.gmail.com>

On Mon, 2013-08-12 at 10:39 +0100, Peter Maydell wrote:
> On 12 August 2013 10:28, Benjamin Herrenschmidt
> <benh@kernel.crashing.org> wrote:
> > We have explicit knowledge of when our endianness change (we get the
> > hcall or a write to some SPR), we can call virtio *then* to adjust the
> > endianness rather than having a call-out to the platform on every
> > access.
> 
> ARM doesn't -- I wouldn't expect changing the endianness of
> exceptions via writing to the SCTLR to trap to the hypervisor
> (and in any case it certainly won't result in a return to
> userspace).

But don't you need to reconfigure the bridge (as per our previous
discussion) ? In that case you do need to call out to qemu ...

Cheers,
Ben.

  reply	other threads:[~2013-08-12  9:43 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-08-12  7:59 [Qemu-devel] [PATCH 0/8] virtio for endian curious guests Take #2 Rusty Russell
2013-08-12  7:59 ` [Qemu-devel] [PATCH 1/8] virtio_get_byteswap: function for endian-ambivalent targets using virtio Rusty Russell
2013-08-12  9:28   ` Benjamin Herrenschmidt
2013-08-12  9:39     ` Peter Maydell
2013-08-12  9:43       ` Benjamin Herrenschmidt [this message]
2013-08-12  9:45         ` Peter Maydell
2013-08-12  9:50           ` Benjamin Herrenschmidt
2013-08-12  9:52             ` Peter Maydell
2013-08-12  9:56               ` Benjamin Herrenschmidt
2013-08-12 10:36                 ` Peter Maydell
2013-08-12 12:56     ` Anthony Liguori
2013-08-13  4:20       ` Rusty Russell
2013-08-13  5:30         ` Benjamin Herrenschmidt
2013-08-14  0:03           ` Rusty Russell
2013-09-06  2:27     ` Rusty Russell
2013-08-12  7:59 ` [Qemu-devel] [PATCH 2/8] target-ppc: ppc64 target's virtio can be either endian Rusty Russell
2013-08-12  7:59 ` [Qemu-devel] [PATCH 3/8] virtio: allow byte swapping for vring and config access Rusty Russell
2013-09-09 12:44   ` [Qemu-devel] [PATCH] hw/9pfs/virtio_9p_device: use virtio wrappers to access headers Greg Kurz
2013-09-10  5:21     ` Rusty Russell
2014-02-18 12:38 [Qemu-devel] [PATCH 0/8] virtio endian-ambivalent target fixes (rebased) Greg Kurz
2014-02-18 12:38 ` [Qemu-devel] [PATCH 1/8] virtio_get_byteswap: function for endian-ambivalent targets using virtio Greg Kurz
2014-02-18 14:48   ` Alexander Graf
2014-02-18 15:03     ` Michael S. Tsirkin
2014-02-18 15:02       ` Alexander Graf
2014-02-18 15:11         ` Michael S. Tsirkin
2014-02-18 15:07           ` Alexander Graf
2014-02-18 15:04       ` Michael S. Tsirkin
2014-02-18 15:12       ` Cornelia Huck
2014-02-18 15:45         ` Cornelia Huck
2014-02-18 16:02           ` Alexander Graf
2014-02-18 16:17             ` Cornelia Huck
2014-02-18 16:21               ` Alexander Graf
2014-02-20 23:26                 ` Rusty Russell
2014-02-18 23:02     ` Andreas Färber
2014-02-18 19:25   ` Andreas Färber
2014-02-19 10:06     ` Greg Kurz
2014-02-20 23:19       ` Rusty Russell

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