Re: [PATCH v3 02/10] pci: mark devices partially unplugged

[Alex Williamson <alex.williamson@redhat.com>]

On Fri, 11 Oct 2019 13:20:07 +0200
Jens Freimann <jfreimann@redhat.com> wrote:

> Only the guest unplug request was triggered. This is needed for
> the failover feature. In case of a failed migration we need to
> plug the device back to the guest.
> 
> Signed-off-by: Jens Freimann <jfreimann@redhat.com>
> ---
>  hw/pci/pci.c         | 2 ++
>  hw/pci/pcie.c        | 3 +++
>  include/hw/pci/pci.h | 1 +
>  3 files changed, 6 insertions(+)
> 
> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> index aa05c2b9b2..c140b37765 100644
> --- a/hw/pci/pci.c
> +++ b/hw/pci/pci.c
> @@ -2078,6 +2078,8 @@ static void pci_qdev_realize(DeviceState *qdev, Error **errp)
>      Error *local_err = NULL;
>      bool is_default_rom;
>  
> +    pci_dev->partially_hotplugged = false;

This is redundant though since the object is zero initialized on
allocation, right?  Thanks,

Alex

> +
>      /* initialize cap_present for pci_is_express() and pci_config_size(),
>       * Note that hybrid PCIs are not set automatically and need to manage
>       * QEMU_PCI_CAP_EXPRESS manually */
> diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
> index a6beb567bd..19363ff8ce 100644
> --- a/hw/pci/pcie.c
> +++ b/hw/pci/pcie.c
> @@ -456,6 +456,9 @@ static void pcie_unplug_device(PCIBus *bus, PCIDevice *dev, void *opaque)
>  {
>      HotplugHandler *hotplug_ctrl = qdev_get_hotplug_handler(DEVICE(dev));
>  
> +    if (dev->partially_hotplugged) {
> +        return;
> +    }
>      hotplug_handler_unplug(hotplug_ctrl, DEVICE(dev), &error_abort);
>      object_unparent(OBJECT(dev));
>  }
> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> index f3f0ffd5fb..f3a39c9bbd 100644
> --- a/include/hw/pci/pci.h
> +++ b/include/hw/pci/pci.h
> @@ -265,6 +265,7 @@ typedef struct PCIReqIDCache PCIReqIDCache;
>  
>  struct PCIDevice {
>      DeviceState qdev;
> +    bool partially_hotplugged;
>  
>      /* PCI config space */
>      uint8_t *config;