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Date: Wed, 22 Jul 2015 07:48:54 +0200
From: Ivano Cerrato <ivano.cerrato@polito.it>
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Subject: Re: [Qemu-devel] Does PCI hotplug work with IVSHMEM?
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To: =?UTF-8?B?TWFyYy1BbmRyw6kgTHVyZWF1?= <marcandre.lureau@gmail.com>
Cc: =?UTF-8?B?TWF1cmljaW8gVsOhc3F1ZXo=?= <mauricio.vasquezbernal@studenti.polito.it>, Fulvio Risso <fulvio.risso@polito.it>, QEMU <qemu-devel@nongnu.org>

Thank you for the answer!
Why do you say that it is not safe to do hotplug with ivshmem?

     Ivano

Il 21/07/2015 18:37, Marc-Andr=C3=A9 Lureau ha scritto:
> Hi
>
> On Tue, Jul 21, 2015 at 12:13 PM, Ivano Cerrato <ivano.cerrato@polito.i=
t> wrote:
>> Is there any way to force the Guest OS to recognize the new device wit=
hout
>> rebooting? Such as rmmod/insmod or equivalent?
> This can be observed in qemu monitor too, info qtree:
>
>        dev: ivshmem, id ""
>          chardev =3D ""
>          size =3D "2048M"
>          vectors =3D 1 (0x1)
>          ioeventfd =3D false
>          msi =3D true
>          shm =3D "foo"
>          role =3D ""
>          use64 =3D 1 (0x1)
>          addr =3D 05.0
>          romfile =3D ""
>          rombar =3D 1 (0x1)
>          multifunction =3D false
>          command_serr_enable =3D true
>          class RAM controller, addr 00:05.0, pci id 1af4:1110 (sub 1af4=
:1100)
>          bar 0: mem at 0x40000000 [0x400000ff]
>          bar 2: mem at 0xffffffffffffffff [0x7ffffffe]
>
> Check dmesg, it fails to allocate for me, but with 1G it works (f22
> x86_64). I don't know what's the reason behind it.
>
> Note that it's not safe to do hotplug with ivshmem (it may assert in
> various ways), I proposed a patch series a few weeks ago, I am going
> to send an updated version soon.
>