From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39755) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VLF04-0001Gm-NW for qemu-devel@nongnu.org; Sun, 15 Sep 2013 12:16:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VLEzy-0001DN-Nt for qemu-devel@nongnu.org; Sun, 15 Sep 2013 12:16:40 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33622) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VLEzy-0001DG-Ey for qemu-devel@nongnu.org; Sun, 15 Sep 2013 12:16:34 -0400 From: Marcel Apfelbaum Date: Sun, 15 Sep 2013 19:16:38 +0300 Message-Id: <1379261801-16969-1-git-send-email-marcel.a@redhat.com> Subject: [Qemu-devel] [PATCH v4 0/3] pci: implement upstream master abort protocol List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: peter.maydell@linaro.org, aliguori@us.ibm.com, mst@redhat.com, jan.kiszka@siemens.com, pbonzini@redhat.com, afaerber@suse.de 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. 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. Note: The code handles only the reads/writes to pci address space that are done by the cpu. I am working on implementing the following on top of this series - Implement upstream master abort - Handling of RECEIVED MASTER ABORT BIT in Stastus register 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: allow MemoryRegion's priority field to accept negative values 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