Resending to expand CC list. Looking in particular for review of the QAPI part of patch 8.
v6: Thanks to Philippe Mathieu-Daudé - Added 'Since' entries to qapi docs. - Added error prints to stubs rather than doing nothing at all. (these two comments will be applied to the Poison injeciton series as well) - Picked up tags Long discussion on whether there was a good way to make the qapi only exist when CONFIG_CXL* was set. Conclusion (I think) was that unfortunately there isn't a good way to do this so stubs are currently the best option. Thanks to Marcus for some great background info on this. Based on series "[PATCH v4 00/10] hw/cxl: CXL emulation cleanups and minor fixes for upstream" Based on: Message-Id: 20230206172816.8201-1-jonathan.came...@huawei.com v3 cover letter. CXL error reporting is complex. This series only covers the protocol related errors reported via PCIe AER - Ira Weiny has posted support for Event log based injection and I will post an update of Poison list injection shortly. My proposal is to upstream this one first, followed by Ira's Event Log series, then finally the Poison List handling. That is based on likely order of Linux kernel support (the support for this type of error reporting went in during the recent merge window, the others are still under review). Note we may propose other non error related features in between! In order to test the kernel support for RAS error handling, I previously provided this series via gitlab, enabling David Jiang's kernel patches to be tested. Now that Linux kernel support is upstream, this series is proposing the support for upstream inclusion in QEMU. Note that support for Multiple Header Recording has been added to QEMU the meantime and a kernel patch to use that feature sent out. https://lore.kernel.org/linux-cxl/20230113154058.16227-1-jonathan.came...@huawei.com/T/#t There are two generic PCI AER precursor feature additions. 1) The PCI_ERR_UCOR_MASK register has not been implemented until now and is necessary for correct emulation. 2) The routing for AER errors, via existing AER error injection, only covered one of two paths given in the PCIe base specification, unfortunately not the one used by the Linux kernel CXL support. The use of MSI for the CXL root ports, both makes sense from the point of view of how it may well be implemented, and works around the documented lack of PCI interrupt routing in i386/q35. I have a hack that lets us correctly route those interrupts but don't currently plan to post it. The actual CXL error injection uses a new QMP interface as documented in the final patch description. The existing AER error injection internals are reused though it's HMP interface is not. Injection via QMP: { "execute": "qmp_capabilities" } ... { "execute": "cxl-inject-uncorrectable-errors", "arguments": { "path": "/machine/peripheral/cxl-pmem0", "errors": [ { "type": "cache-address-parity", "header": [ 3, 4] }, { "type": "cache-data-parity", "header": [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31] }, { "type": "internal", "header": [ 1, 2, 4] } ] }} ... { "execute": "cxl-inject-correctable-error", "arguments": { "path": "/machine/peripheral/cxl-pmem0", "type": "physical" } } Jonathan Cameron (8): hw/pci/aer: Implement PCI_ERR_UNCOR_MASK register hw/pci/aer: Add missing routing for AER errors hw/pci-bridge/cxl_root_port: Wire up AER hw/pci-bridge/cxl_root_port: Wire up MSI hw/mem/cxl-type3: Add AER extended capability hw/cxl: Fix endian issues in CXL RAS capability defaults / masks hw/pci/aer: Make PCIE AER error injection facility available for other emulation to use. hw/mem/cxl_type3: Add CXL RAS Error Injection Support. hw/cxl/cxl-component-utils.c | 20 ++- hw/mem/cxl_type3.c | 294 +++++++++++++++++++++++++++++++++ hw/mem/cxl_type3_stubs.c | 17 ++ hw/mem/meson.build | 2 + hw/pci-bridge/cxl_root_port.c | 64 +++++++ hw/pci/pci-internal.h | 1 - hw/pci/pcie_aer.c | 14 +- include/hw/cxl/cxl_component.h | 26 +++ include/hw/cxl/cxl_device.h | 11 ++ include/hw/pci/pcie_aer.h | 1 + include/hw/pci/pcie_regs.h | 3 + qapi/cxl.json | 128 ++++++++++++++ qapi/meson.build | 1 + qapi/qapi-schema.json | 1 + 14 files changed, 572 insertions(+), 11 deletions(-) create mode 100644 hw/mem/cxl_type3_stubs.c create mode 100644 qapi/cxl.json -- 2.37.2
