Re: [Qemu-devel] [PATCH v2] Add remove_boot_device_path() function for hot-unplug device

[Marcel Apfelbaum <marcel.a@redhat.com>]

On Sun, 2014-05-11 at 11:07 +0800, lijun wrote:
> On 04/22/2014 05:21 PM, Marcel Apfelbaum wrote:
> > On Wed, 2014-04-16 at 22:20 +0800, Jun Li wrote:
> >> Add remove_boot_device_path() function to remove bootindex when hot-unplug
> >> a device. This patch fixed virtio-blk/virtio-net/scsi-disk/scsi-generic device.
> >> So it has fixed bug1086603, ref:
> >> https://bugzilla.redhat.com/show_bug.cgi?id=1086603
> >>
> >> Make some changes based on Andreas's good suggestion.
> >>
> >> Signed-off-by: Jun Li <junmuzi@gmail.com>
> >> ---
> >>   hw/block/virtio-blk.c   |  1 +
> >>   hw/net/virtio-net.c     |  1 +
> >>   hw/scsi/scsi-disk.c     |  6 ++++--
> >>   hw/scsi/scsi-generic.c  |  3 +++
> >>   include/sysemu/sysemu.h |  2 ++
> >>   vl.c                    | 16 ++++++++++++++++
> >>   6 files changed, 27 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
> >> index 8a568e5..ecdd266 100644
> >> --- a/hw/block/virtio-blk.c
> >> +++ b/hw/block/virtio-blk.c
> >> @@ -752,6 +752,7 @@ static void virtio_blk_device_unrealize(DeviceState *dev, Error **errp)
> >>       unregister_savevm(dev, "virtio-blk", s);
> >>       blockdev_mark_auto_del(s->bs);
> >>       virtio_cleanup(vdev);
> >> +    remove_boot_device_path(s->conf->bootindex, dev, "/disk@0,0");
> >>   }
> >>   
> >>   static Property virtio_blk_properties[] = {
> >> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> >> index 33bd233..520c029 100644
> >> --- a/hw/net/virtio-net.c
> >> +++ b/hw/net/virtio-net.c
> >> @@ -1633,6 +1633,7 @@ static void virtio_net_device_unrealize(DeviceState *dev, Error **errp)
> >>       g_free(n->vqs);
> >>       qemu_del_nic(n->nic);
> >>       virtio_cleanup(vdev);
> >> +    remove_boot_device_path(n->nic_conf.bootindex, dev, "/ethernet-phy@0");
> >>   }
> >>   
> >>   static void virtio_net_instance_init(Object *obj)
> >> diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
> >> index 48a28ae..bb2176a 100644
> >> --- a/hw/scsi/scsi-disk.c
> >> +++ b/hw/scsi/scsi-disk.c
> >> @@ -2150,12 +2150,14 @@ static void scsi_disk_reset(DeviceState *dev)
> >>       s->tray_open = 0;
> >>   }
> >>   
> >> -static void scsi_destroy(SCSIDevice *dev)
> >> +static void scsi_destroy(SCSIDevice *sdev)
> >>   {
> >> -    SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev);
> >> +    SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, sdev);
> >> +    DeviceState *dev = DEVICE(sdev);
> >>   
> >>       scsi_device_purge_requests(&s->qdev, SENSE_CODE(NO_SENSE));
> >>       blockdev_mark_auto_del(s->qdev.conf.bs);
> >> +    remove_boot_device_path(s->qdev.conf.bootindex, dev, NULL);
> >>   }
> >>   
> >>   static void scsi_disk_resize_cb(void *opaque)
> >> diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
> >> index 8d92e0d..2531a44 100644
> >> --- a/hw/scsi/scsi-generic.c
> >> +++ b/hw/scsi/scsi-generic.c
> >> @@ -388,8 +388,11 @@ static void scsi_generic_reset(DeviceState *dev)
> >>   
> >>   static void scsi_destroy(SCSIDevice *s)
> >>   {
> >> +    DeviceState *dev = DEVICE(s);
> >> +
> >>       scsi_device_purge_requests(s, SENSE_CODE(NO_SENSE));
> >>       blockdev_mark_auto_del(s->conf.bs);
> >> +    remove_boot_device_path(s->conf.bootindex, dev, NULL);
> >>   }
> >>   
> >>   static int scsi_generic_initfn(SCSIDevice *s)
> >> diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
> >> index ba5c7f8..f7ad1e2 100644
> >> --- a/include/sysemu/sysemu.h
> >> +++ b/include/sysemu/sysemu.h
> >> @@ -193,6 +193,8 @@ void rtc_change_mon_event(struct tm *tm);
> >>   
> >>   void add_boot_device_path(int32_t bootindex, DeviceState *dev,
> >>                             const char *suffix);
> >> +void remove_boot_device_path(int32_t bootindex, DeviceState *dev,
> >> +                             const char *suffix);
> >>   char *get_boot_devices_list(size_t *size, bool ignore_suffixes);
> >>   
> >>   DeviceState *get_boot_device(uint32_t position);
> >> diff --git a/vl.c b/vl.c
> >> index 9975e5a..1713c68 100644
> >> --- a/vl.c
> >> +++ b/vl.c
> >> @@ -1184,6 +1184,22 @@ void add_boot_device_path(int32_t bootindex, DeviceState *dev,
> >>       QTAILQ_INSERT_TAIL(&fw_boot_order, node, link);
> >>   }
> >>   
> >> +void remove_boot_device_path(int32_t bootindex, DeviceState *dev,
> >> +                             const char *suffix)
> >> +{
> >> +    FWBootEntry *node, *next_node;
> >> +
> >> +    if (bootindex == -1) {
> >> +        return;
> >> +    }
> >> +
> >> +    QTAILQ_FOREACH_SAFE(node, &fw_boot_order, link, next_node)
> >> +        if (node->bootindex == bootindex) {
> >> +            QTAILQ_REMOVE(&fw_boot_order, node, link);
> > Hi Liu.
> > Sorry for the late response, but I was in vacation :) .
> > Your patch looks OK, I once wrote another one on the same issue
> > (it touched the same problem, but it was *completely* different).
> >
> > Here is the *real* problem: fw_boot_order list is not queried
> > again on guest reboot, so 'touching' the list has no effect.
> > While your code is correct (as far as I can tell), it seems
> > that his place is after the above problem is solved.
> >
> > No one is currently working on this, feel free
> > to take this challenge. I'll help however I can.
> Hi Marcel,
> 
> Sorry, so later response. I got a heavy sick these days. I have see 
> these discussion emails between you and Paolo.
> After guest reboot, seabios will got devices info from boards(this 
> boards be generated by qemu command line). Just as Paolo's explanations, 
> but I am not familiar with seabios. I will do some research about this. 
> Thank you very much.
> 
> BTW, My first name is Jun, my last name is Li, my English name is 
> woodpecker, you could call me jun or woodpecker. :)
Hi Jun,
I hope you are feeling better!
If you need further assistance, just let us know.

Thanks,
Marcel 

> 
> Best Regards,
> Jun Li
> 
> >
> >> +            return;
> >> +        }
> >> +}
> >> +
> >>   DeviceState *get_boot_device(uint32_t position)
> >>   {
> >>       uint32_t counter = 0;
> >
> >
>