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Re: [Qemu-devel] [PATCH] virtio-pci: implement cfg capability

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH] virtio-pci: implement cfg capability
Date: Mon, 6 Jul 2015 10:11:18 +0100

On 6 July 2015 at 10:06, Michael S. Tsirkin <address@hidden> wrote:
> On Mon, Jul 06, 2015 at 10:46:31AM +0200, Paolo Bonzini wrote:
>> Why host endian and not device (in this case little) endian?

> It's the endian of the originator of the transaction.
> And emulated device code is all compiled in host endian-ness.

But address_space_rw() is just the "memcpy bytes to the
target's memory" operation -- if you have a pile of bytes
then there are no endianness concerns. If you don't have
a pile of bytes then you need to know the structure of
the data you're DMAing around, and you should probably
have a loop doing things with the specify-the-width functions.

-- PMM

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