This patch fixes the following BUG: Even a guest is able to detect virtio_pci device, the init function the Linux virtio_pci driver will hang because zPCI does not support the subregions used by virtio_pci.
It follows that right now the PCI support is very limited (e.g. pass through of a host vfio device) To enable features like virtio-pci several modifications needs to be done. As already stated above, Virtio-PCI uses subregions, which may eventually be discontinuous inside bars instead of a single flat region often used by real devices. The address offset being formerly calculated from the BAR base address must be adapted to the subregions instead of to the single region. This patch provides the new calculation for the three kind of BAR access, zPCI STORE, zPCI LOAD and zPCI STORE BLOCK done by zPCI. We use the opportunity to - enhance the fault detection for zPCI STORE and LOAD, - enhance the fault detection and to provide the maximum STORE BLOCK block size, maxstbl, for zPCI STORE BLOCK - factor out part of the code used to calculate the offset and access the BARs, - factor out the code for endianess conversion. Pierre Morel (7): s390x/pci: factor out endianess conversion s390x/pci: rework PCI STORE s390x/pci: rework PCI LOAD s390x/pci: rework PCI STORE BLOCK s390x/pci: move the memory region read from pcilg s390x/pci: move the memory region write from pcistg s390x/pci: search for subregion inside the BARs hw/s390x/s390-pci-bus.h | 1 + hw/s390x/s390-pci-inst.c | 248 ++++++++++++++++++++++++++++------------------- hw/s390x/s390-pci-inst.h | 2 +- 3 files changed, 151 insertions(+), 100 deletions(-) -- 2.7.4 Changelog: from v2 - rewording of comments, coding style. from v1 - suppress fallthrough to PCI_ROM_SLOT to handle it in the default case. - reword most of the patch commit messages - add comments to the endianness conversion - reword somme comments inside the patches
