[Qemu-devel] Re: [PATCH 1/3] pci: allow devices being tagged as not hotpluggable.

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Nov 30, 2010 at 02:26:02PM +0100, Gerd Hoffmann wrote:
> This patch adds a field to PCIDeviceInfo to tag devices as being
> not hotpluggable.  Any attempt to plug-in or -out such a device
> will throw an error.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

Acked-by: Michael S. Tsirkin <mst@redhat.com>

> ---
>  hw/pci.c |   10 ++++++++++
>  hw/pci.h |    3 +++
>  qerror.c |    4 ++++
>  qerror.h |    3 +++
>  4 files changed, 20 insertions(+), 0 deletions(-)
> 
> diff --git a/hw/pci.c b/hw/pci.c
> index 438c0d1..aee8d63 100644
> --- a/hw/pci.c
> +++ b/hw/pci.c
> @@ -1546,6 +1546,11 @@ static int pci_qdev_init(DeviceState *qdev, DeviceInfo *base)
>                                       info->is_bridge);
>      if (pci_dev == NULL)
>          return -1;
> +    if (qdev->hotplugged && info->no_hotplug) {
> +        qerror_report(QERR_DEVICE_NO_HOTPLUG, info->qdev.name);
> +        do_pci_unregister_device(pci_dev);
> +        return -1;
> +    }
>      rc = info->init(pci_dev);
>      if (rc != 0) {
>          do_pci_unregister_device(pci_dev);
> @@ -1575,7 +1580,12 @@ static int pci_qdev_init(DeviceState *qdev, DeviceInfo *base)
>  static int pci_unplug_device(DeviceState *qdev)
>  {
>      PCIDevice *dev = DO_UPCAST(PCIDevice, qdev, qdev);
> +    PCIDeviceInfo *info = container_of(qdev->info, PCIDeviceInfo, qdev);
>  
> +    if (info->no_hotplug) {
> +        qerror_report(QERR_DEVICE_NO_HOTPLUG, info->qdev.name);
> +        return -1;
> +    }
>      return dev->bus->hotplug(dev->bus->hotplug_qdev, dev,
>                               PCI_HOTPLUG_DISABLED);
>  }
> diff --git a/hw/pci.h b/hw/pci.h
> index 09b3e4c..1d1c515 100644
> --- a/hw/pci.h
> +++ b/hw/pci.h
> @@ -431,6 +431,9 @@ typedef struct {
>      /* pcie stuff */
>      int is_express;   /* is this device pci express? */
>  
> +    /* device isn't hot-pluggable */
> +    int no_hotplug;
> +
>      /* rom bar */
>      const char *romfile;
>  } PCIDeviceInfo;
> diff --git a/qerror.c b/qerror.c
> index ac2cdaf..9d0cdeb 100644
> --- a/qerror.c
> +++ b/qerror.c
> @@ -101,6 +101,10 @@ static const QErrorStringTable qerror_table[] = {
>          .desc      = "Device '%(device)' has no child bus",
>      },
>      {
> +        .error_fmt = QERR_DEVICE_NO_HOTPLUG,
> +        .desc      = "Device '%(device)' does not support hotplugging",
> +    },
> +    {
>          .error_fmt = QERR_DUPLICATE_ID,
>          .desc      = "Duplicate ID '%(id)' for %(object)",
>      },
> diff --git a/qerror.h b/qerror.h
> index 943a24b..b0f69da 100644
> --- a/qerror.h
> +++ b/qerror.h
> @@ -90,6 +90,9 @@ QError *qobject_to_qerror(const QObject *obj);
>  #define QERR_DEVICE_NO_BUS \
>      "{ 'class': 'DeviceNoBus', 'data': { 'device': %s } }"
>  
> +#define QERR_DEVICE_NO_HOTPLUG \
> +    "{ 'class': 'DeviceNoHotplug', 'data': { 'device': %s } }"
> +
>  #define QERR_DUPLICATE_ID \
>      "{ 'class': 'DuplicateId', 'data': { 'id': %s, 'object': %s } }"
>  
> -- 
> 1.7.1
>