[PATCH] vfio-pci: Enable PCIe extended config space

[PATCH] vfio-pci: Enable PCIe extended config space

[Alex Williamson]

We don't know pre-init time whether the device we're exposing is PCIe
or legacy PCI.  We could ask for it to be specified via a device
option, but that seems like too much to ask of the user.  Instead we
can assume everything will be PCIe, which makes PCI-core allocate
enough config space.  Removing the flag during init leaves the space
allocated, but allows legacy PCI devices to report the real device
config space size to rest of Qemu.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
 hw/vfio_pci.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/vfio_pci.c b/hw/vfio_pci.c
index c51ae67..66537b7 100644
--- a/hw/vfio_pci.c
+++ b/hw/vfio_pci.c
@@ -1899,6 +1899,9 @@ static int vfio_get_device(VFIOGroup *group, const char *name, VFIODevice *vdev)
             (unsigned long)reg_info.flags);
 
     vdev->config_size = reg_info.size;
+    if (vdev->config_size == PCI_CONFIG_SPACE_SIZE) {
+        vdev->pdev.cap_present &= ~QEMU_PCI_CAP_EXPRESS;
+    }
     vdev->config_offset = reg_info.offset;
 
 error:
@@ -2121,6 +2124,7 @@ static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
     pdc->exit = vfio_exitfn;
     pdc->config_read = vfio_pci_read_config;
     pdc->config_write = vfio_pci_write_config;
+    pdc->is_express = 1; /* We might be */
 }
 
 static const TypeInfo vfio_pci_dev_info = {

Re: [PATCH] vfio-pci: Enable PCIe extended config space

[Michael S. Tsirkin]

On Wed, Jan 23, 2013 at 05:46:13PM -0700, Alex Williamson wrote:
> We don't know pre-init time whether the device we're exposing is PCIe
> or legacy PCI.  We could ask for it to be specified via a device
> option, but that seems like too much to ask of the user.  Instead we
> can assume everything will be PCIe, which makes PCI-core allocate
> enough config space.  Removing the flag during init leaves the space
> allocated, but allows legacy PCI devices to report the real device
> config space size to rest of Qemu.
> 
> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

It's a bit of a hack but I don't have a better idea.
Acked-by: Michael S. Tsirkin <mst@redhat.com>


> ---
>  hw/vfio_pci.c |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/hw/vfio_pci.c b/hw/vfio_pci.c
> index c51ae67..66537b7 100644
> --- a/hw/vfio_pci.c
> +++ b/hw/vfio_pci.c
> @@ -1899,6 +1899,9 @@ static int vfio_get_device(VFIOGroup *group, const char *name, VFIODevice *vdev)
>              (unsigned long)reg_info.flags);
>  
>      vdev->config_size = reg_info.size;
> +    if (vdev->config_size == PCI_CONFIG_SPACE_SIZE) {
> +        vdev->pdev.cap_present &= ~QEMU_PCI_CAP_EXPRESS;
> +    }
>      vdev->config_offset = reg_info.offset;
>  
>  error:
> @@ -2121,6 +2124,7 @@ static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
>      pdc->exit = vfio_exitfn;
>      pdc->config_read = vfio_pci_read_config;
>      pdc->config_write = vfio_pci_write_config;
> +    pdc->is_express = 1; /* We might be */
>  }
>  
>  static const TypeInfo vfio_pci_dev_info = {
>