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

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

On Wed, Jan 04, 2017 at 09:57:18PM +0200, Marcel Apfelbaum wrote:
> Make Power Management State flag writable to conform
> with the PCI Express spec.
> 
> Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>

Same comment as previously.

> ---
>  hw/virtio/virtio-pci.c | 5 +++++
>  include/hw/pci/pcie.h  | 2 ++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> index 66a5bf3..7a98078 100644
> --- a/hw/virtio/virtio-pci.c
> +++ b/hw/virtio/virtio-pci.c
> @@ -1796,12 +1796,15 @@ static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp)
>  
>          pos = pci_add_capability(pci_dev, PCI_CAP_ID_PM, 0, PCI_PM_SIZEOF);
>          assert(pos > 0);
> +        pci_dev->exp.pm_cap = pos;
>  
>          /*
>           * Indicates that this function complies with revision 1.2 of the
>           * PCI Power Management Interface Specification.
>           */
>          pci_set_word(pci_dev->config + pos + PCI_PM_PMC, 0x3);
> +        pci_set_word(pci_dev->wmask + pos + PCI_PM_CTRL,
> +                     PCI_PM_CTRL_STATE_MASK);
>          /* Init error enabling flags */
>          pcie_cap_deverr_init(pci_dev);
>          /* Init Link Control Register */
> @@ -1846,6 +1849,8 @@ static void virtio_pci_reset(DeviceState *qdev)
>      if (pci_is_express(dev)) {
>          pcie_cap_deverr_reset(dev);
>          pcie_cap_lnkctl_reset(dev);
> +
> +        pci_set_word(dev->config + dev->exp.pm_cap + PCI_PM_CTRL, 0);
>      }
>  }
>  
> diff --git a/include/hw/pci/pcie.h b/include/hw/pci/pcie.h
> index 7d6611a..7c9c573 100644
> --- a/include/hw/pci/pcie.h
> +++ b/include/hw/pci/pcie.h
> @@ -63,6 +63,8 @@ typedef enum {
>  struct PCIExpressDevice {
>      /* Offset of express capability in config space */
>      uint8_t exp_cap;
> +    /* Offset of Power Management capability in config space */
> +    uint8_t pm_cap;
>  
>      /* SLOT */
>      bool hpev_notified; /* Logical AND of conditions for hot plug event.
> -- 
> 2.5.5