Re: [Qemu-devel] [Qemu-stable] [QEMU PATCH v3] qdev: fix get_fw_dev_path to support to add nothing to fw_dev_path

[Amos Kong <akong@redhat.com>]

On Thu, May 30, 2013 at 10:30:21PM +0200, Stefan Priebe wrote:
> Am 30.05.2013 15:13, schrieb Amos Kong:
> >On Thu, May 30, 2013 at 02:09:25PM +0200, Stefan Priebe - Profihost AG wrote:
> >>Am 29.05.2013 09:56, schrieb Amos Kong:
> >>>Recent virtio refactoring in QEMU made virtio-bus become the parent bus
> >>>of scsi-bus, and virtio-bus doesn't have get_fw_dev_path implementation,
> >>>typename will be added to fw_dev_path by default, the new fw_dev_path
> >>>could not be identified by seabios. It causes that bootindex parameter
> >>>of scsi device doesn't work.
> >>>
> >>>This patch implements get_fw_dev_path() in BusClass, it will be called
> >>>if bus doesn't implement the method, tyename will be added to
> >>>fw_dev_path. If the implemented method returns NULL, nothing will be
> >>>added to fw_dev_path.
> >>>
> >>>It also implements virtio_bus_get_fw_dev_path() to return NULL. Then
> >>>QEMU will still pass original style of fw_dev_path to seabios.
> >>>
> >>>Signed-off-by: Amos Kong <akong@redhat.com>
> >>>--
> >>>v2: only add nothing to fw_dev_path when get_fw_dev_path() is
> >>>     implemented and returns NULL. then it will not effect other devices
> >>>     don't have get_fw_dev_path() implementation.
> >>>v3: implement default get_fw_dev_path() in BusClass
> >>>---
> >>>  hw/core/qdev.c         | 10 +++++++++-
> >>>  hw/virtio/virtio-bus.c |  6 ++++++
> >>>  2 files changed, 15 insertions(+), 1 deletion(-)
> >>>
> >>>diff --git a/hw/core/qdev.c b/hw/core/qdev.c
> >>>index 6985ad8..9190a7e 100644
> >>>--- a/hw/core/qdev.c
> >>>+++ b/hw/core/qdev.c
> >>>@@ -515,7 +515,7 @@ static int qdev_get_fw_dev_path_helper(DeviceState *dev, char *p, int size)
> >>>              l += snprintf(p + l, size - l, "%s", d);
> >>>              g_free(d);
> >>>          } else {
> >>>-            l += snprintf(p + l, size - l, "%s", object_get_typename(OBJECT(dev)));
> >>>+            return l;
> >>>          }
> >>>      }
> >>>      l += snprintf(p + l , size - l, "/");
> >>>@@ -867,9 +867,17 @@ static void qbus_initfn(Object *obj)
> >>>      QTAILQ_INIT(&bus->children);
> >>>  }
> >>>
> >>>+static char *default_bus_get_fw_dev_path(DeviceState *dev)
> >>>+{
> >>>+    return g_strdup(object_get_typename(OBJECT(dev)));
> >>>+}
> >>>+
> >>>  static void bus_class_init(ObjectClass *class, void *data)
> >>>  {
> >>>+    BusClass *bc = BUS_CLASS(class);
> >>>+
> >>>      class->unparent = bus_unparent;
> >>>+    bc->get_fw_dev_path = default_bus_get_fw_dev_path;
> >>>  }
> >>>
> >>>  static void qbus_finalize(Object *obj)
> >>>diff --git a/hw/virtio/virtio-bus.c b/hw/virtio/virtio-bus.c
> >>>index ea2e11a..6849a01 100644
> >>>--- a/hw/virtio/virtio-bus.c
> >>>+++ b/hw/virtio/virtio-bus.c
> >>>@@ -161,10 +161,16 @@ static char *virtio_bus_get_dev_path(DeviceState *dev)
> >>>      return qdev_get_dev_path(proxy);
> >>>  }
> >>>
> >>>+static char *virtio_bus_get_fw_dev_path(DeviceState *dev)
> >>>+{
> >>>+    return NULL;
> >>>+}
> >>>+
> >>>  static void virtio_bus_class_init(ObjectClass *klass, void *data)
> >>>  {
> >>>      BusClass *bus_class = BUS_CLASS(klass);
> >>>      bus_class->get_dev_path = virtio_bus_get_dev_path;
> >>>+    bus_class->get_fw_dev_path = virtio_bus_get_fw_dev_path;
> >>>  }
> >>>
> >>>  static const TypeInfo virtio_bus_info = {
> >>>
> >>
> >>To me booting VMs with more than one SCSI disk does still not work.
> >
> >Hi Stefan,
> >
> >Can you provide your full command-lines ?
> >
> >>net: bootindex=100
> >>scsi0: bootindex=201
> >>
> >>does not work
> >>
> >>this one works fine:
> >>net: bootindex=200
> >>scsi0: bootindex=101
> >
> >For me, they all work, (1. check the bootindex string, 2. check boot menu by entering F12, 3. check by waiting ).
> 

Thanks for your reply.

> Oh it does only NOT work if i have TWO network cards. It never seems
> to try to boot from scsi0. It tries PXE net0 then net1 and then it
> restarts.
 
Something is wrong here, '-boot menu=on ' -> guest could not restart
if no available boot device, it will also try to boot from other
unselected devices (DVD, floppy)

'-boot menu=on,strict=on,reboot-timeout=1000' -> boot from net0, net1, disk1, then restart ...

It seems the problem of your bios.bin or rbd device.

You can try with a scsi disk (unavailable)
# qemu-img create /tmp/none.qcow2 -f qcow2 1M


I'm using seabios(pc-bios/bios.bin) in qemu repo & latest seabios in seabios.org

> Example:
> Command line:
> qemu -chardev
> socket,id=qmp,path=/var/run/qemu-server/155.qmp,server,nowait -mon
> chardev=qmp,mode=control -pidfile /var/run/qemu-server/155.pid
> -daemonize -name TTT -smp sockets=1,cores=4 -nodefaults -boot
> menu=on -vga cirrus -k de -m 4096 -device
> piix3-usb-uhci,id=uhci,bus=pci.0,addr=0x1.0x2 -device
> usb-tablet,id=tablet,bus=uhci.0,port=1 -device
> virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 -device
> virtio-scsi-pci,id=scsihw0,bus=pci.0,addr=0x5 -drive file=rbd:stor/vmdisk-1:mon_host=10.255.0.100\:6789\;10.255.0.101\:6789\;10.255.0.102\:6789\;:auth_supported=none,if=none,id=drive-scsi0,iops_rd=215,iops_wr=155,bps_rd=136314880,bps_wr=94371840,aio=native,discard=on
> -device scsi-hd,bus=scsihw0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0,id=scsi0,bootindex=200
> -drive if=none,id=drive-ide2,media=cdrom,aio=native -device
> ide-cd,bus=ide.1,unit=0,drive=drive-ide2,id=ide2 -netdev type=tap,id=net0,ifname=tap155i0,script=/var/lib/qemu-server/pve-bridge,vhost=on
> -device virtio-net-pci,mac=6A:32:5C:4B:38:F4,netdev=net0,bus=pci.0,addr=0x12,id=net0,bootindex=100
> -netdev type=tap,id=net1,ifname=tap155i1,script=/var/lib/qemu-server/pve-bridge,vhost=on
> -device virtio-net-pci,mac=D6:3A:F6:E2:91:0A,netdev=net1,bus=pci.0,addr=0x13,id=net1,bootindex=101
> -rtc base=localtime


This patch only fixed the 'wrong' fw_dev_path. If qemu passes valid bootindex
string to seabios, then patch works as expected.

---

I re-tested with a similar commandline.  it tried to boot from net0, net1, disk1 (works as expected).

1. boot guest ( paused in the begin stage)
# qemu-upstream -name TTT -smp sockets=1,cores=4 -nodefaults -boot menu=on \
 -vga cirrus -m 4096 -device piix3-usb-uhci,id=uhci,bus=pci.0,addr=0x1.0x2 \
 -device usb-tablet,id=tablet,bus=uhci.0,port=1 \
 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 \
 -device virtio-scsi-pci,id=scsihw0,bus=pci.0,addr=0x5  \
 -drive  file=/images/none.qcow2,if=none,id=drive-scsi0,aio=native,discard=on \
 -device scsi-hd,bus=scsihw0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0,id=scsi0,bootindex=200 \
 -drive if=none,id=drive-ide2,media=cdrom,aio=native  \
 -device ide-cd,bus=ide.1,unit=0,drive=drive-ide2,id=ide2 \
 -netdev type=tap,id=net0,ifname=tap155i0,vhost=on \
 -device virtio-net-pci,mac=6A:32:5C:4B:38:F4,netdev=net0,bus=pci.0,addr=0x12,id=net0,bootindex=100 \
 -netdev type=tap,id=net1,ifname=tap155i1,vhost=on \
 -device virtio-net-pci,mac=D6:3A:F6:E2:91:0A,netdev=net1,bus=pci.0,addr=0x13,id=net1,bootindex=101 \
 -rtc base=localtime \
 -chardev socket,id=seabioslog,path=/tmp/seabioslog,server,nowait \
 -device isa-debugcon,chardev=seabioslog,iobase=0x402 -S -monitor stdio

2. start to connect seabios debug log
# nc -U /tmp/seabioslog

3. continue guest in monitor
# (qemu) cont

| Press F12 for boot menu.
| 
| Searching bootorder for: HALT
| drive 0x000fd870: PCHS=2/16/64 translation=large LCHS=2/16/64 s=2048
| Running option rom at cb00:0003
| Space available for UMB: 000cd800-000ed000
| Returned 57344 bytes of ZoneHigh
| e820 map has 8 items:
|   0: 0000000000000000 - 000000000009fc00 = 1 RAM
|   1: 000000000009fc00 - 00000000000a0000 = 2 RESERVED
|   2: 00000000000f0000 - 0000000000100000 = 2 RESERVED
|   3: 0000000000100000 -enter handle_19:
|   NULL
| Booting from ROM...
| Booting from c900:0358
| enter handle_18:
|   NULL
| Booting from ROM...
| Booting from ca00:0358
| enter handle_18:
|   NULL
| Booting from Hard Disk...
| Boot failed: not a bootable disk
| 
| enter handle_18:
|   NULL
| Booting from DVD/CD...
| Device reports MEDIUM NOT PRESENT
| scsi_is_ready returned -1
| Boot failed: Could not read from CDROM (code 0003)
| enter handle_18:
|   NULL
| Booting from Floppy...
| Boot failed: could not read the boot disk
| 
| enter handle_18:
|   NULL
| No bootable device.

 
> Stefan

-- 
			Amos.