Re: [Qemu-devel] [PATCH 3/4] hw/virtio: fix Link Control Register for PCI Express virtio devices

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

On Wed, Jan 04, 2017 at 09:57:17PM +0200, Marcel Apfelbaum wrote:
> Make several Link Control Register flags writable to conform
> with the PCI Express spec.
> 
> Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>

Same comment as 2.

> ---
>  hw/pci/pcie.c          | 14 ++++++++++++++
>  hw/virtio/virtio-pci.c |  3 +++
>  include/hw/pci/pcie.h  |  3 +++
>  3 files changed, 20 insertions(+)
> 
> diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
> index 62c1def..a596400 100644
> --- a/hw/pci/pcie.c
> +++ b/hw/pci/pcie.c
> @@ -220,6 +220,20 @@ void pcie_cap_deverr_reset(PCIDevice *dev)
>                                   PCI_EXP_DEVCTL_FERE | PCI_EXP_DEVCTL_URRE);
>  }
>  
> +void pcie_cap_lnkctl_init(PCIDevice *dev)
> +{
> +    uint32_t pos = dev->exp.exp_cap;
> +    pci_long_test_and_set_mask(dev->wmask + pos + PCI_EXP_LNKCTL,
> +                               PCI_EXP_LNKCTL_CCC | PCI_EXP_LNKCTL_ES);
> +}
> +
> +void pcie_cap_lnkctl_reset(PCIDevice *dev)
> +{
> +    uint8_t *lnkctl = dev->config + dev->exp.exp_cap + PCI_EXP_LNKCTL;
> +    pci_long_test_and_clear_mask(lnkctl,
> +                                 PCI_EXP_LNKCTL_CCC | PCI_EXP_LNKCTL_ES);
> +}
> +
>  static void hotplug_event_update_event_status(PCIDevice *dev)
>  {
>      uint32_t pos = dev->exp.exp_cap;
> diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> index da2124f..66a5bf3 100644
> --- a/hw/virtio/virtio-pci.c
> +++ b/hw/virtio/virtio-pci.c
> @@ -1804,6 +1804,8 @@ static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp)
>          pci_set_word(pci_dev->config + pos + PCI_PM_PMC, 0x3);
>          /* Init error enabling flags */
>          pcie_cap_deverr_init(pci_dev);
> +        /* Init Link Control Register */
> +        pcie_cap_lnkctl_init(pci_dev);
>      } else {
>          /*
>           * make future invocations of pci_is_express() return false
> @@ -1843,6 +1845,7 @@ static void virtio_pci_reset(DeviceState *qdev)
>  
>      if (pci_is_express(dev)) {
>          pcie_cap_deverr_reset(dev);
> +        pcie_cap_lnkctl_reset(dev);
>      }
>  }
>  
> diff --git a/include/hw/pci/pcie.h b/include/hw/pci/pcie.h
> index 056d25e..7d6611a 100644
> --- a/include/hw/pci/pcie.h
> +++ b/include/hw/pci/pcie.h
> @@ -93,6 +93,9 @@ uint8_t pcie_cap_flags_get_vector(PCIDevice *dev);
>  void pcie_cap_deverr_init(PCIDevice *dev);
>  void pcie_cap_deverr_reset(PCIDevice *dev);
>  
> +void pcie_cap_lnkctl_init(PCIDevice *dev);
> +void pcie_cap_lnkctl_reset(PCIDevice *dev);
> +
>  void pcie_cap_slot_init(PCIDevice *dev, uint16_t slot);
>  void pcie_cap_slot_reset(PCIDevice *dev);
>  void pcie_cap_slot_write_config(PCIDevice *dev,
> -- 
> 2.5.5