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charset="utf-8" Signed-off-by: Konstantin Shkolnyy --- include/hw/s390x/s390-pci-bus.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/hw/s390x/s390-pci-bus.h b/include/hw/s390x/s390-pci-bu= s.h index e3cbee2695..2fab28e6e0 100644 --- a/include/hw/s390x/s390-pci-bus.h +++ b/include/hw/s390x/s390-pci-bus.h @@ -271,6 +271,14 @@ typedef struct S390PCIDMACount { QTAILQ_ENTRY(S390PCIDMACount) link; } S390PCIDMACount; =20 +/* + * This structure holds the PCI device AddressSpace that QEMU needs to link + * into its internal structures before the zPCI and PCI devices are fully + * initialized. It's a QEMU requirement to provide this "root" AddressSpace + * early. The AddressSpace is only actually used for I/O while the PCI + * device is plugged in and configured by the guest, at which time it gets + * additional memory subregions from zPCI device, that can do real work. + */ struct S390PCIIOMMU { Object parent_obj; AddressSpace as; --=20 2.34.1