Re: [Qemu-devel] [qemu-s390x] [PATCH v3 3/5] s390: vfio_pci: Use a PCI Group structure

[Thomas Huth <thuth@redhat.com>]

On 07/09/2019 02.16, Matthew Rosato wrote:
> From: Pierre Morel <pmorel@linux.ibm.com>
> 
> We use a S390PCIGroup structure to hold the information
> related to zPCI Function group.
> 
> This allows us to be ready to support multiple groups and to retrieve
> the group information from the host.
> 
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
>  hw/s390x/s390-pci-bus.c  | 42 ++++++++++++++++++++++++++++++++++++++++++
>  hw/s390x/s390-pci-bus.h  | 11 ++++++++++-
>  hw/s390x/s390-pci-inst.c | 22 +++++++++++++---------
>  3 files changed, 65 insertions(+), 10 deletions(-)
> 
> diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
> index 963a41c..e625217 100644
> --- a/hw/s390x/s390-pci-bus.c
> +++ b/hw/s390x/s390-pci-bus.c
> @@ -730,6 +730,46 @@ static void s390_pci_iommu_free(S390pciState *s, PCIBus *bus, int32_t devfn)
>      object_unref(OBJECT(iommu));
>  }
>  
> +static S390PCIGroup *s390_grp_create(int ug)
> +{
> +    S390PCIGroup *grp;
> +    S390pciState *s = s390_get_phb();
> +
> +    grp = g_new0(S390PCIGroup, 1);
> +    grp->ug = ug;
> +    QTAILQ_INSERT_TAIL(&s->zpci_grps, grp, link);
> +    return grp;
> +}

Maybe an ignorant question, but shouldn't there also be some kind of
clean up function that also frees the memory again, e.g. during a
machine reset? Or are these groups supposed to survive a machine reset?

 Thomas