spapr_pci: map the MSI window in each PHB

On sPAPR, virtio devices are connected to the PCI bus and use MSI-X.
Commit cc943c36faa192cd4b32af8fe5edb31894017d35 has modified MSI-X
so that writes are made using the bus master address space and follow
the IOMMU path.

Unfortunately, the IOMMU address space address space does not have an
MSI window: the notification is silently dropped in unassigned_mem_write
instead of reaching the guest... The most visible effect is that all
virtio devices are non-functional on sPAPR since then. :(

This patch does the following:
1) map the MSI window into the IOMMU address space for each PHB
   - since each PHB instantiates its own IOMMU address space, we
     can safely map the window at a fixed address (SPAPR_PCI_MSI_WINDOW)
   - no real need to keep the MSI window setup in a separate function,
     the spapr_pci_msi_init() code moves to spapr_phb_realize().

2) kill the global MSI window as it is not needed in the end

Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/hw/pci-host/spapr.h b/include/hw/pci-host/spapr.h
index 32f0aa7..4ea2a0d 100644
--- a/include/hw/pci-host/spapr.h
+++ b/include/hw/pci-host/spapr.h
@@ -70,7 +70,7 @@ struct sPAPRPHBState {
 
     MemoryRegion memspace, iospace;
     hwaddr mem_win_addr, mem_win_size, io_win_addr, io_win_size;
-    MemoryRegion memwindow, iowindow;
+    MemoryRegion memwindow, iowindow, msiwindow;
 
     uint32_t dma_liobn;
     AddressSpace iommu_as;