These are the Qemu changes needed to support the q35 chipset for xen
I based the patches from 2017 found on the mailing list here:
https://lists.xenproject.org/archives/html/xen-devel/2018-03/msg01176.html
I have been using a version of these patches on Xen 4.16 with Qemu
version 4.1 for over 6 months. The guest VMs are very stable, and PCIe
PT is working as was designed (all of the PCIe devices are on the root
PCIe device). I have successfully passed through GPUs, NICs, etc. I was
asked by those in the community to attempt to once again upstream the
patches. I have them working with Seabios and OVMF (patches are needed
to OVMF which I will be sending to the mailing list). The Qemu patches
allow for the xenvbd to properly unplug the AHCI SATA device, and all
xen pv windows drivers work as intended.
I used the original author of the patches to get a majority of this to work:
Alexey Gerasimenko. I fixed the patches to be in line with the upstream
Qemu and Xen versions. Any original issues may still exist; however, I
am sure in time they can be improved. If the code doesn't exist then they
can't be actively looked at by the community.
I am not an expert on the Q35 chipset or PCIe technology. This is my
first patch to this mailing list.
Joel Upham (23):
pc/xen: Xen Q35 support: provide IRQ handling for PCI devices
pc/q35: Apply PCI bus BSEL property for Xen PCI device hotplug
q35/acpi/xen: Provide ACPI PCI hotplug interface for Xen on Q35
q35/xen: Add Xen platform device support for Q35
q35: Fix incorrect values for PCIEXBAR masks
xen/pt: XenHostPCIDevice: provide functions for PCI Capabilities and
PCIe Extended Capabilities enumeration
xen/pt: avoid reading PCIe device type and cap version multiple times
xen/pt: determine the legacy/PCIe mode for a passed through device
xen/pt: Xen PCIe passthrough support for Q35: bypass PCIe topology
check
xen/pt: add support for PCIe Extended Capabilities and larger config
space
xen/pt: handle PCIe Extended Capabilities Next register
xen/pt: allow to hide PCIe Extended Capabilities
xen/pt: add Vendor-specific PCIe Extended Capability descriptor and
sizing
xen/pt: add fixed-size PCIe Extended Capabilities descriptors
xen/pt: add AER PCIe Extended Capability descriptor and sizing
xen/pt: add descriptors and size calculation for
RCLD/ACS/PMUX/DPA/MCAST/TPH/DPC PCIe Extended Capabilities
xen/pt: add Resizable BAR PCIe Extended Capability descriptor and
sizing
xen/pt: add VC/VC9/MFVC PCIe Extended Capabilities descriptors and
sizing
xen/pt: Fake capability id
xen platform: unplug ahci object
pc/q35: setup q35 for xen
qdev-monitor/pt: bypass root device check
s3 support: enabling s3 with q35
hw/acpi/ich9.c | 22 +-
hw/acpi/pcihp.c | 6 +-
hw/core/machine.c | 19 +
hw/i386/pc_piix.c | 3 +-
hw/i386/pc_q35.c | 39 +-
hw/i386/xen/xen-hvm.c | 7 +-
hw/i386/xen/xen_platform.c | 19 +-
hw/isa/lpc_ich9.c | 53 +-
hw/isa/piix3.c | 2 +-
hw/pci-host/q35.c | 28 +-
hw/pci/pci.c | 17 +
hw/xen/xen-host-pci-device.c | 106 +++-
hw/xen/xen-host-pci-device.h | 6 +-
hw/xen/xen_pt.c | 49 +-
hw/xen/xen_pt.h | 18 +-
hw/xen/xen_pt_config_init.c | 1103 ++++++++++++++++++++++++++++++---
include/hw/acpi/pcihp.h | 2 +
include/hw/boards.h | 1 +
include/hw/i386/pc.h | 3 +
include/hw/pci-host/q35.h | 4 +-
include/hw/pci/pci.h | 3 +
include/hw/southbridge/ich9.h | 1 +
include/hw/xen/xen.h | 4 +-
qemu-options.hx | 1 +
softmmu/qdev-monitor.c | 4 +-
stubs/xen-hw-stub.c | 4 +-
26 files changed, 1394 insertions(+), 130 deletions(-)
--
2.34.1
