On Mon, Sep 16, 2013 at 11:21:13AM +0300, Marcel Apfelbaum wrote: > PCI spec requires that a transaction that has not been claimed > by any PCI bus devices will be terminated by the initiator > with "master abort". For read transactions -1(FFFFFFFF) is returned and > writes are silently dropped.
OK looks good to me, I put this on the pci branch. > Implementation: > - Allowed the MemoryRegion priority to be negative so a subregion will be > visible on all the addresses not covered by other container subregions. > - Added a memory region with negative priority that extends over all the > pci address space. This region catches all the accesses > to the unassigned pci addresses. > - The MemoryRegion's ops emulates the master abort scenario. > > I am working on implementing the following on top of this series > - Implement upstream master abort > - Handling of RECEIVED MASTER ABORT BIT in Status register > > Changes from v4: > - Addressed Peter Maydell comments > - Changed memory patches commit comment > - Addressed Michael S. Tsirkin comments > - Changed PCI master_abort_mem ops endian-nes to DEVICE_LITTLE_ENDIAN > > Changes from v3: > - Addressed Peter Maydell comments > - Removed unnecessary changes to priority of MemoryListener > - Ensured that priority is now signed in all related places > - Added to memory docs explanation on signed priorities > - Addresses Michael S. Tsirkin comments > - Changed the name of the new Memory region to master_abort_mem > - Made master abort priority INT_MIN instead of -1 > - Removed handling of RECEIVED MASTER ABORT BIT; it will be taken > care in a different series > > Changes from v2: > - minor: changed nr of patches in the title > - minor: modified series list > > Changes from v1: > - "pci-unassigned-mem" MemoryRegion resides now in PCIBus and not on > various Host Bridges > - "pci-unassgined-mem" does not have a ".valid.accept" field and > implements read write methods > > Marcel Apfelbaum (3): > memory: Change MemoryRegion priorities from unsigned to signed > docs/memory: Explictly state that MemoryRegion priority is signed > hw/pci: partially handle pci master abort > > docs/memory.txt | 4 ++++ > hw/core/sysbus.c | 4 ++-- > hw/pci/pci.c | 27 +++++++++++++++++++++++++++ > include/exec/memory.h | 4 ++-- > include/hw/pci/pci_bus.h | 1 + > include/hw/sysbus.h | 2 +- > memory.c | 4 ++-- > 7 files changed, 39 insertions(+), 7 deletions(-) > > -- > 1.8.3.1