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helo=mx0a-002c1b01.pphosted.com", "X-Spam_score_int": "-31", "X-Spam_score": "-3.2", "X-Spam_bar": "---", "X-Spam_report": "(-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.438,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "From Windows 8.1 onwards ISA serial IRQs cannot be shared when ACPI Revision\n3.0 is used in the FACP table. The reason for this is that if a 2-byte IRQ\nDescriptor is used then the interrupt is considered to be high true, edge\nsensitive, non-shareable. Since legacy serial ports COM1/3 and COM2/4 share\nan IRQ then if more than 2 serial ports are added, Windows indicates a\nconflict in Device Manager and these combinations cannot be used together.\n\nAdd a new 3-byte IRQ Descriptor to the _CRS resource indicating that the\nISA serial IRQ is high true, edge sensitive and shareable. This enables all 4\nlegacy serial ports to be used in Windows without conflict.\n\nTested on Windows 8.1 and Windows 11 with 4 instances of -serial on the command\nline and copying data simultaneously across serial ports COM1/3 and COM2/4:\n\n ./build/qemu-system-x86_64 \\\n -accel kvm \\\n -M q35,hpet=off \\\n -m 4G \\\n -cpu host \\\n -drive file=win81.iso,format=raw,if=ide,bus=2,unit=0,media=cdrom \\\n -drive file=win81.qcow2,format=qcow2,if=ide,bus=0,unit=0 \\\n -device VGA \\\n -serial tcp::4001,server=on,wait=off \\\n -serial tcp::4002,server=on,wait=off \\\n -serial tcp::4003,server=on,wait=off \\\n -serial tcp::4004,server=on,wait=off\n\nNote that with this series applied, if extra ISA serial ports are added to an\nexisting VM then it is necessary to go to Device Manager, select \"Add legacy\nhardware\" from the \"Action\" menu, and then reboot the VM for the serial ports\nto be detected correctly without Device Manager indicating a conflict.\n\nSigned-off-by: Mark Cave-Ayland <mark.caveayland@nutanix.com>\n\nv3\n- Rebase onto master\n- Define IRQ as Active-High-Edge-Triggered (as seen by the PIC) to ensure compliance\n with the ACPI specification section 6.4.2.1.\n\nv2\n- Remove _PRS changes (including AML build changes that are no longer required)\n and compatibility property as suggested by Igor\n\n\nMark Cave-Ayland (4):\n hw/acpi/aml-build.c: add aml_irq() representing the 3-byte IRQ\n descriptor\n tests/acpi: allow DSDT acpi table changes\n hw/char/serial-isa.c: declare IRQ as shared in ACPI IRQ descriptor\n tests: data: update x86 ACPI tables\n\n include/hw/acpi/aml-build.h | 2 ++\n hw/acpi/aml-build-stub.c | 6 +++++\n hw/acpi/aml-build.c | 25 ++++++++++++++++++\n hw/char/serial-isa.c | 3 ++-\n tests/data/acpi/x86/microvm/DSDT | Bin 365 -> 366 bytes\n tests/data/acpi/x86/microvm/DSDT.ioapic2 | Bin 365 -> 366 bytes\n tests/data/acpi/x86/microvm/DSDT.pcie | Bin 2985 -> 2986 bytes\n tests/data/acpi/x86/microvm/DSDT.rtc | Bin 404 -> 405 bytes\n tests/data/acpi/x86/microvm/DSDT.usb | Bin 414 -> 415 bytes\n tests/data/acpi/x86/pc/DSDT | Bin 8598 -> 8599 bytes\n tests/data/acpi/x86/pc/DSDT.acpierst | Bin 8509 -> 8510 bytes\n tests/data/acpi/x86/pc/DSDT.acpihmat | Bin 9923 -> 9924 bytes\n tests/data/acpi/x86/pc/DSDT.bridge | Bin 15469 -> 15470 bytes\n tests/data/acpi/x86/pc/DSDT.cphp | Bin 9062 -> 9063 bytes\n tests/data/acpi/x86/pc/DSDT.dimmpxm | Bin 10252 -> 10253 bytes\n tests/data/acpi/x86/pc/DSDT.hpbridge | Bin 8549 -> 8550 bytes\n tests/data/acpi/x86/pc/DSDT.hpbrroot | Bin 5087 -> 5088 bytes\n tests/data/acpi/x86/pc/DSDT.ipmikcs | Bin 8670 -> 8671 bytes\n tests/data/acpi/x86/pc/DSDT.memhp | Bin 9957 -> 9958 bytes\n tests/data/acpi/x86/pc/DSDT.nohpet | Bin 8456 -> 8457 bytes\n tests/data/acpi/x86/pc/DSDT.numamem | Bin 8604 -> 8605 bytes\n tests/data/acpi/x86/pc/DSDT.roothp | Bin 12391 -> 12392 bytes\n tests/data/acpi/x86/q35/DSDT | Bin 8427 -> 8428 bytes\n tests/data/acpi/x86/q35/DSDT.acpierst | Bin 8444 -> 8445 bytes\n tests/data/acpi/x86/q35/DSDT.acpihmat | Bin 9752 -> 9753 bytes\n .../data/acpi/x86/q35/DSDT.acpihmat-generic-x | Bin 12637 -> 12638 bytes\n .../acpi/x86/q35/DSDT.acpihmat-noinitiator | Bin 8706 -> 8707 bytes\n tests/data/acpi/x86/q35/DSDT.applesmc | Bin 8473 -> 8474 bytes\n tests/data/acpi/x86/q35/DSDT.bridge | Bin 12040 -> 12041 bytes\n tests/data/acpi/x86/q35/DSDT.core-count | Bin 12985 -> 12986 bytes\n tests/data/acpi/x86/q35/DSDT.core-count2 | Bin 33842 -> 33843 bytes\n tests/data/acpi/x86/q35/DSDT.cphp | Bin 8891 -> 8892 bytes\n tests/data/acpi/x86/q35/DSDT.cxl | Bin 13218 -> 13219 bytes\n tests/data/acpi/x86/q35/DSDT.dimmpxm | Bin 10081 -> 10082 bytes\n tests/data/acpi/x86/q35/DSDT.ipmibt | Bin 8502 -> 8503 bytes\n tests/data/acpi/x86/q35/DSDT.ipmismbus | Bin 8515 -> 8516 bytes\n tests/data/acpi/x86/q35/DSDT.ivrs | Bin 8444 -> 8445 bytes\n tests/data/acpi/x86/q35/DSDT.memhp | Bin 9786 -> 9787 bytes\n tests/data/acpi/x86/q35/DSDT.mmio64 | Bin 9557 -> 9558 bytes\n tests/data/acpi/x86/q35/DSDT.multi-bridge | Bin 13280 -> 13281 bytes\n tests/data/acpi/x86/q35/DSDT.noacpihp | Bin 8289 -> 8290 bytes\n tests/data/acpi/x86/q35/DSDT.nohpet | Bin 8285 -> 8286 bytes\n tests/data/acpi/x86/q35/DSDT.numamem | Bin 8433 -> 8434 bytes\n tests/data/acpi/x86/q35/DSDT.pvpanic-isa | Bin 8528 -> 8529 bytes\n tests/data/acpi/x86/q35/DSDT.thread-count | Bin 12985 -> 12986 bytes\n tests/data/acpi/x86/q35/DSDT.thread-count2 | Bin 33842 -> 33843 bytes\n tests/data/acpi/x86/q35/DSDT.tis.tpm12 | Bin 9033 -> 9034 bytes\n tests/data/acpi/x86/q35/DSDT.tis.tpm2 | Bin 9059 -> 9060 bytes\n tests/data/acpi/x86/q35/DSDT.type4-count | Bin 18661 -> 18662 bytes\n tests/data/acpi/x86/q35/DSDT.viot | Bin 14684 -> 14685 bytes\n tests/data/acpi/x86/q35/DSDT.xapic | Bin 35790 -> 35791 bytes\n 51 files changed, 35 insertions(+), 1 deletion(-)" }