On Wed, 10 Aug 2011, Asias He wrote:
On 08/10/2011 01:53 AM, Pekka Enberg wrote:
As we boot to '/bin/sh' by default, enable kernel DHCP autoconfiguration too.
The guest kernel needs to be configured with the following configuration
options:
CONFIG_IP_PNP=y
CONFIG_IP_PNP_DHCP=y
Cc: Asias He <asias.hejun@xxxxxxxxx>
Cc: Avi Kivity <avi@xxxxxxxxxx>
Cc: Cyrill Gorcunov <gorcunov@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Prasad Joshi <prasadjoshi124@xxxxxxxxx>
Cc: Sasha Levin <levinsasha928@xxxxxxxxx>
Signed-off-by: Pekka Enberg <penberg@xxxxxxxxxx>
---
tools/kvm/README | 3 +++
tools/kvm/builtin-run.c | 2 +-
2 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/tools/kvm/README b/tools/kvm/README
index 5b85461..2cf9364 100644
--- a/tools/kvm/README
+++ b/tools/kvm/README
@@ -70,6 +70,9 @@ linux-0.2.img.bz2
- For virtio-rng device (--rng):
CONFIG_HW_RANDOM_VIRTIO=y
+ - For kernel DHCP autoconf (when booting to /bin/sh):
+ CONFIG_IP_PNP=y
+ CONFIG_IP_PNP_DHCP=y
5. And finally, launch the hypervisor:
diff --git a/tools/kvm/builtin-run.c b/tools/kvm/builtin-run.c
index fa5de27..af7f59c 100644
--- a/tools/kvm/builtin-run.c
+++ b/tools/kvm/builtin-run.c
@@ -601,7 +601,7 @@ int kvm_cmd_run(int argc, const char **argv, const char *prefix)
using_rootfs = 1;
if (!strstr(real_cmdline, "init="))
- strlcat(real_cmdline, " init=/bin/sh ", sizeof(real_cmdline));
+ strlcat(real_cmdline, " init=/bin/sh ip=dhcp ", sizeof(real_cmdline));
}
if (!strstr(real_cmdline, "root="))
'ip=dhcp' makes kernel try to use nfs as root fs which results in a long
time 'wait and fail' and finally fallback to 9p as root fs.
[ 1.688000] Sending DHCP requests ., OK
[ 1.695000] IP-Config: Got DHCP answer from 192.168.33.1, my address
is 192.168.33.15
[ 1.699000] IP-Config: Complete:
[ 1.700000] device=eth0, addr=192.168.33.15, mask=255.255.255.0,
gw=192.168.33.1,
[ 1.703000] host=192.168.33.15, domain=stu.buaa.edu.cn,
nis-domain=(none),
[ 1.706000] bootserver=192.168.33.1, rootserver=192.168.33.1,
rootpath=
[ 36.769000] VFS: Unable to mount root fs via NFS, trying floppy.
[ 36.771000] VFS: Mounted root (9p filesystem) on device 0:14.
I reverted the patch for now. Thanks, Asias!
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