Re: [Qemu-devel] [PATCH 1/1] s390x/pci: let pci devices start in configured mode

[Cornelia Huck <cohuck@redhat.com>]

On Tue,  7 Nov 2017 18:54:55 +0100
Christian Borntraeger <borntraeger@de.ibm.com> wrote:

> Currently, to enable a pci device in the guest, the user has to issue
> echo 1 > /sys/bus/pci/slots/00000000/power. This is not what people
> expect. On an LPAR, the user can put a PCI device in configured or
> deconfigured state via IOCDS. The "start in deconfigured state" can be
> used for "sharing" a pci function across LPARs. This is not what we are
> going to use in KVM, so always start configured.
> 
> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
> Acked-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
> Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
> ---
>  hw/s390x/s390-pci-bus.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
> index e7a58e8..2b1e140 100644
> --- a/hw/s390x/s390-pci-bus.c
> +++ b/hw/s390x/s390-pci-bus.c
> @@ -715,7 +715,7 @@ static void s390_pcihost_hot_plug(HotplugHandler *hotplug_dev,
>          pbdev->pdev = pdev;
>          pbdev->iommu = s390_pci_get_iommu(s, pdev->bus, pdev->devfn);
>          pbdev->iommu->pbdev = pbdev;
> -        pbdev->state = ZPCI_FS_STANDBY;
> +        pbdev->state = ZPCI_FS_DISABLED;
>  
>          if (s390_pci_msix_init(pbdev)) {
>              error_setg(errp, "MSI-X support is mandatory "

A pci function already has to be configured before we can assign it via
vfio, right?

I think I'll queue this for 2.11.