Re: [Qemu-devel] Does PCI hotplug work with IVSHMEM?

[Ivano Cerrato <ivano.cerrato@polito.it>]

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-André Lureau ha scritto:
> Hi
>
> On Tue, Jul 21, 2015 at 12:13 PM, Ivano Cerrato <ivano.cerrato@polito.it> wrote:
>> Is there any way to force the Guest OS to recognize the new device without
>> rebooting? Such as rmmod/insmod or equivalent?
> This can be observed in qemu monitor too, info qtree:
>
>        dev: ivshmem, id ""
>          chardev = ""
>          size = "2048M"
>          vectors = 1 (0x1)
>          ioeventfd = false
>          msi = true
>          shm = "foo"
>          role = ""
>          use64 = 1 (0x1)
>          addr = 05.0
>          romfile = ""
>          rombar = 1 (0x1)
>          multifunction = false
>          command_serr_enable = 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.
>