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Date: Fri, 01 Mar 2013 10:51:33 +0100
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] virtio-rng and fd passing
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To: Eric Blake <eblake@redhat.com>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Stefan Berger <stefanb@linux.vnet.ibm.com>

Il 01/03/2013 01:36, Eric Blake ha scritto:
> For fd passing to work, we have to use qemu_open() instead of raw
> open().  Is there any way to enforce that all files being opened by qemu
> go through the appropriate qemu_open() wrapper?
> 
> Meanwhile, we have a quandary on the libvirt side of things: qemu 1.4
> supports fd passing in general, but does not support it for rng.  I
> guess the same is true for -blockdev - we don't (yet) have a way to do
> fd passing for backing files.  Do we need some sort of QMP command that
> will let libvirt query for a particular device whether that device is
> known to support fd passing, so that libvirt can use fd passing for all
> supported devices, while falling back to older direct open()s, and to
> know which instance of qemu can safely have open() blocked at the
> SELinux or syscall blacklist level?

Let's change open to qemu_open for 1.4.1, and declare rng only supported
in 1.4.1...

Paolo