From: "Michael S. Tsirkin" <mst@redhat.com>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Jason Wang <jasowang@redhat.com>,
QEMU Developers <qemu-devel@nongnu.org>,
Greg Kurz <gkurz@linux.vnet.ibm.com>
Subject: Re: [Qemu-devel] [PATCH 1/2] memory: allow zero size for adjust_endianness()
Date: Thu, 27 Aug 2015 15:25:17 +0300 [thread overview]
Message-ID: <20150827152348-mutt-send-email-mst@redhat.com> (raw)
In-Reply-To: <CAFEAcA8MwmWvuPFd8R8UVNeBkJaP59v7gAB619=0AX7GZAKEAA@mail.gmail.com>
On Thu, Aug 27, 2015 at 01:20:52PM +0100, Peter Maydell wrote:
> On 27 August 2015 at 13:17, Michael S. Tsirkin <mst@redhat.com> wrote:
> > Basically the point is that ABI is extended to make
> > ioeventfd with len = 0 mean "any length".
> > 0 is thus not meaningless anymore.
>
> But how can you do adjustment for incorrect endianness
> if you don't know the size of the data that you're
> trying to work with? That's why this switch insists
> that the size is 1, 2, 4 or 8.
>
> -- PMM
For kvm at least, "any length" implies "any data".
So data is eventually discarded, we don't really need
to adjust it for endian-ness.
--
MST
next prev parent reply other threads:[~2015-08-27 12:25 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-26 10:04 [Qemu-devel] [PATCH 1/2] memory: allow zero size for adjust_endianness() Jason Wang
2015-08-26 10:04 ` [Qemu-devel] [PATCH 2/2] pci: test-dev: try to test fast mmio bus for wildcard mmio event Jason Wang
2015-08-27 10:28 ` Michael S. Tsirkin
2015-08-26 14:21 ` [Qemu-devel] [PATCH 1/2] memory: allow zero size for adjust_endianness() Peter Maydell
2015-08-26 14:51 ` Greg Kurz
2015-08-27 4:50 ` Jason Wang
2015-08-27 10:49 ` Peter Maydell
2015-08-27 10:53 ` Michael S. Tsirkin
2015-08-27 11:04 ` Peter Maydell
2015-08-27 11:08 ` Michael S. Tsirkin
2015-08-27 12:12 ` Peter Maydell
2015-08-27 12:17 ` Michael S. Tsirkin
2015-08-27 12:20 ` Peter Maydell
2015-08-27 12:25 ` Michael S. Tsirkin [this message]
2015-08-27 12:27 ` Peter Maydell
2015-08-27 12:30 ` Michael S. Tsirkin
2015-08-27 13:10 ` Greg Kurz
2015-08-28 2:23 ` Jason Wang
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