Hi Marc-André, all,
even with 1G hugepages, we are not able to hotplug an ivshmem device.
The outputs we get are the following:
* In qemu monitor:
$info qtree
......
dev: ivshmem, id ""
chardev = <null>
size = "2048M"
vectors = 1
ioeventfd = off
msi = on
shm = "fd"
role = <null>
use64 = 1
addr = 04.0
romfile = <null>
rombar = 1
multifunction = off
command_serr_enable = on
class RAM controller, addr 00:04.0, pci id 1af4:1110 (sub
1af4:1100)
bar 0: mem at 0xe0000000 [0xe00000ff]
bar 2: mem at 0xffffffffffffffff [0x7ffffffe]
* In the guest:
$sudo lshw
....
*-memory UNCLAIMED
description: RAM memory
product: Virtio Inter-VM shared memory
vendor: Red Hat, Inc
physical id: 4
bus info: pci@0000:00:04.0
version: 00
width: 64 bits
clock: 33MHz (30.3ns)
configuration: latency=0
resources: memory:e0000000-e00000ff
$dmesg
....
[ 18.365599] pci 0000:00:04.0: [1af4:1110] type 00 class 0x050000
[ 18.365657] pci 0000:00:04.0: reg 0x10: [mem
0x00000000-0x000000ff]
[ 18.365746] pci 0000:00:04.0: reg 0x18: [mem
0x00000000-0x7fffffff 64bit pref]
[ 18.366002] pci 0000:00:04.0: BAR 2: can't assign mem pref
(size 0x80000000)
[ 18.366005] pci 0000:00:04.0: BAR 0: assigned [mem
0xe0000000-0xe00000ff]
[ 18.366739] ACPI: Error installing CMOS-RTC region handler
[ 18.366876] pci 0000:00:00.0: no hotplug settings from platform
[ 18.366877] pci 0000:00:00.0: using default PCI settings
[ 18.366900] pci 0000:00:01.0: no hotplug settings from platform
[ 18.366901] pci 0000:00:01.0: using default PCI settings
[ 18.366923] ata_piix 0000:00:01.1: no hotplug settings from
platform
[ 18.366924] ata_piix 0000:00:01.1: using default PCI settings
[ 18.366945] piix4_smbus 0000:00:01.3: no hotplug settings
from platform
[ 18.366946] piix4_smbus 0000:00:01.3: using default PCI settings
[ 18.366967] cirrus 0000:00:02.0: no hotplug settings from
platform
[ 18.366968] cirrus 0000:00:02.0: using default PCI settings
[ 18.366989] 8139cp 0000:00:03.0: no hotplug settings from
platform
[ 18.366990] 8139cp 0000:00:03.0: using default PCI settings
[ 18.367011] pci 0000:00:04.0: no hotplug settings from platform
[ 18.367012] pci 0000:00:04.0: using default PCI settings
The host is running the Linux kernel 1.13.0-43-generic, while the guest
runs the kernel 3.12.0-rc1 .
Instead, the QEMU version is the 1.6.2 with the patch for DPDK.
Any help would be really appreciated.
Thank you in advance,
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.cerr...@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.
