Can't get multi-process qemu to work
Dear QEMU folks,
I'm trying to run the multi-process QEMU, referencing to the document,
but it is not work well.
document: https://www.qemu.org/docs/master/system/multi-process.html
The current status is that I couldn't find a remote device on pci bus
from qemu.
The steps taken are as follows:
1. build qemu v6.2.0-rc2
2. prepare a program that creates a socket pair and exec shell.
```
$ cat pipe.c
#include
#include
#include
#include
int main(){
int sv[2];
if (!socketpair(AF_UNIX, SOCK_STREAM, 0, sv)){
printf("%d,%d\n",sv[0],sv[1]);
system("$SHELL");
}
}
$ gcc pipe.c
$ ./a.out
```
3. check the socket pair
```
$ ls -alt /proc/self/fd
...
lrwx-- 1 test users 64 12月 11 19:56 3 -> 'socket:[148118067]'
lrwx-- 1 test users 64 12月 11 19:56 4 -> 'socket:[148118068]'
```
4. run a qemu as remote machine that has scsi device
```
$ ./qemu/build/x86_64-softmmu/qemu-system-x86_64 -machine x-remote
-nographic -D c.log -serial mon:stdio \
-device lsi53c895a,id=lsi0 -drive
id=drive_image2,file=./busybox/rootfs.img \
-device scsi-hd,id=drive2,drive=drive_image2,bus=lsi0.0,scsi-id=0 \
-object x-remote-object,id=robj1,devid=lsi0,fd=4 &
```
5. run a qemu with x-pci-proxy-dev
```
$ ./qemu/build/x86_64-softmmu/qemu-system-x86_64 -m 2G -kernel
./linux/arch/x86_64/boot/bzImage\
-append 'console=ttyS0 root=/dev/sda rw init=/init' -drive
file=./busybox/rootfs.clt.img \
-serial mon:telnet:localhost:5556,server,nowait -nographic -D
remote.log \
-device x-pci-proxy-dev,id=lsi0,fd=3
...
# lspci
00:01.0 Class 0601: 8086:7000
00:00.0 Class 0600: 8086:1237
00:01.3 Class 0680: 8086:7113
00:03.0 Class 0200: 8086:100e
00:01.1 Class 0101: 8086:7010
00:02.0 Class 0300: 1234:
```
There is not scsi device in the list.
Is there other any documentations for the multi-process qemu?
Best regards,
Shunsuke
Re: Can't get multi-process qemu to work
On Mon, 11 Dec 2023 at 11:52, Shunsuke Mie wrote: > The steps taken are as follows: > > 1. build qemu v6.2.0-rc2 Is that a typo for "v8.2.0-rc2", or are you really building from a two year old release candidate ? thanks -- PMM
Can't get multi-process qemu to work
Dear QEMU folks,
I'm trying to run the multi-process QEMU, referencing to the document,
but it is not work well.
document: https://www.qemu.org/docs/master/system/multi-process.html
The current status is that I couldn't find a remote device on pci bus
from qemu.
The steps taken are as follows:
1. build qemu v6.2.0-rc2
2. prepare a program that creates a socket pair and exec shell.
```
$ cat pipe.c
#include
#include
#include
#include
int main(){
int sv[2];
if (!socketpair(AF_UNIX, SOCK_STREAM, 0, sv)){
printf("%d,%d\n",sv[0],sv[1]);
system("$SHELL");
}
}
$ gcc pipe.c
$ ./a.out
```
3. check the socket pair
```
$ ls -alt /proc/self/fd
...
lrwx-- 1 test users 64 12月 11 19:56 3 -> 'socket:[148118067]'
lrwx-- 1 test users 64 12月 11 19:56 4 -> 'socket:[148118068]'
```
4. run a qemu as remote machine that has scsi device
```
$ ./qemu/build/x86_64-softmmu/qemu-system-x86_64 -machine x-remote
-nographic -D c.log -serial mon:stdio \
-device lsi53c895a,id=lsi0 -drive
id=drive_image2,file=./busybox/rootfs.img \
-device scsi-hd,id=drive2,drive=drive_image2,bus=lsi0.0,scsi-id=0 \
-object x-remote-object,id=robj1,devid=lsi0,fd=4 &
```
5. run a qemu with x-pci-proxy-dev
```
$ ./qemu/build/x86_64-softmmu/qemu-system-x86_64 -m 2G -kernel
./linux/arch/x86_64/boot/bzImage\
-append 'console=ttyS0 root=/dev/sda rw init=/init' -drive
file=./busybox/rootfs.clt.img \
-serial mon:telnet:localhost:5556,server,nowait -nographic -D
remote.log \
-device x-pci-proxy-dev,id=lsi0,fd=3
...
# lspci
00:01.0 Class 0601: 8086:7000
00:00.0 Class 0600: 8086:1237
00:01.3 Class 0680: 8086:7113
00:03.0 Class 0200: 8086:100e
00:01.1 Class 0101: 8086:7010
00:02.0 Class 0300: 1234:
```
There is not scsi device in the list.
Is there other any documentations for the multi-process qemu?
Best regards,
Shunsuke
