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c87759ce87
qemu/hw
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Alex Williamson c87759ce87 q35: Revert to kernel irqchip 
Commit b2fc91db84 ("q35: set split kernel irqchip as default") changed
the default for the pc-q35-4.0 machine type to use split irqchip, which
turned out to have disasterous effects on vfio-pci INTx support.  KVM
resampling irqfds are registered for handling these interrupts, but
these are non-functional in split irqchip mode.  We can't simply test
for split irqchip in QEMU as userspace handling of this interrupt is a
significant performance regression versus KVM handling (GeForce GPUs
assigned to Windows VMs are non-functional without forcing MSI mode or
re-enabling kernel irqchip).

The resolution is to revert the change in default irqchip mode in the
pc-q35-4.1 machine and create a pc-q35-4.0.1 machine for the 4.0-stable
branch.  The qemu-q35-4.0 machine type should not be used in vfio-pci
configurations for devices requiring legacy INTx support without
explicitly modifying the VM configuration to use kernel irqchip.

Link: https://bugs.launchpad.net/qemu/+bug/1826422
Fixes: b2fc91db84 ("q35: set split kernel irqchip as default")
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-Id: <155786484688.13873.6037015630912983760.stgit@gimli.home>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2019-06-03 14:03:03 +02:00
..
9pfs trace-events: Fix attribution of trace points to source 2019-03-22 16:18:07 +00:00
acpi acpi/pcihp: Add a few more trace points related to unplug 2019-05-20 18:40:02 -04:00
adc kconfig: introduce kconfig files 2019-03-07 21:45:53 +01:00
alpha * Kconfig improvements (msi_nonbroken, imply for default PCI devices) 2019-03-28 09:18:53 +00:00
arm imx25-pdk: create ds1338 for qtest inside the test 2019-06-03 14:03:02 +02:00
audio Revert "audio: fix pc speaker init" 2019-04-01 08:53:40 +02:00
block vhost-user-blk: Add support to reconnect backend 2019-05-20 18:40:02 -04:00
bt kconfig: introduce kconfig files 2019-03-07 21:45:53 +01:00
char Mostly bugfixes and cleanups, the most important being 2019-05-17 16:17:34 +01:00
core q35: Revert to kernel irqchip 2019-06-03 14:03:03 +02:00
cpu kconfig: introduce kconfig files 2019-03-07 21:45:53 +01:00
cris cris-softmmu.mak: express dependencies with Kconfig 2019-03-07 21:46:19 +01:00
display hw/display: add vhost-user-vga & gpu-pci 2019-05-29 06:30:45 +02:00
dma hw/dma: Compile the bcm2835_dma device as common object 2019-04-29 17:36:03 +01:00
gpio Pull request 2019-03-25 17:01:10 +00:00
hppa * Kconfig improvements (msi_nonbroken, imply for default PCI devices) 2019-03-28 09:18:53 +00:00
hyperv hyperv: express dependencies with kconfig 2019-03-07 21:45:53 +01:00
i2c hw/arm: Express dependencies of realview, versatile and vexpress with Kconfig 2019-05-13 09:36:31 +02:00
i386 q35: Revert to kernel irqchip 2019-06-03 14:03:03 +02:00
ide Kconfig settings for the Arm machines 2019-05-13 16:52:56 +01:00
input hw/input: Add a CONFIG_PS2 switch for the ps2.c file 2019-05-15 11:56:53 +02:00
intc spapr/xive: fix multiple resets when using the 'dual' interrupt mode 2019-05-29 11:39:47 +10:00
ipack build: convert pci.mak to Kconfig 2019-03-07 21:45:53 +01:00
ipmi ipmi: express dependencies with kconfig 2019-03-07 21:45:53 +01:00
isa hw/ppc/40p: Move the MC146818 RTC to the board where it belongs 2019-05-29 11:39:44 +10:00
lm32 pflash: Clean up after commit 368a354f02, part 2 2019-03-11 22:53:44 +01:00
m68k m68k-softmmu.mak: express dependencies with Kconfig 2019-03-07 21:46:19 +01:00
mem trace-events: Shorten file names in comments 2019-03-22 16:18:07 +00:00
microblaze hw/microblaze/zynqmp: Use object_initialize_child for correct ref. counting 2019-05-24 15:29:02 -03:00
mips Various testing updates 2019-05-28 17:38:32 +01:00
misc edu: uses uint64_t in dma operation 2019-06-03 14:03:01 +02:00
moxie moxie-softmmu.mak: express dependencies with Kconfig 2019-03-07 21:46:19 +01:00
net Mostly bugfixes and cleanups, the most important being 2019-05-17 16:17:34 +01:00
nios2 Add generic Nios II board. 2019-04-29 16:09:51 +01:00
nvram hw/nvram/fw_cfg: Store 'reboot-timeout' as little endian 2019-05-23 14:10:31 +02:00
openrisc target/openrisc: Fix LGPL information in the file headers 2019-05-08 17:45:54 +02:00
pci pci: msix: move 'MSIX_CAP_LENGTH' to header file 2019-05-22 17:35:27 +02:00
pci-bridge pci: Simplify pci_bus_is_root() 2019-05-20 18:40:02 -04:00
pci-host hw/pci-host: Use object_initialize_child for correct reference counting 2019-05-02 16:56:33 +02:00
pcmcia kconfig: introduce kconfig files 2019-03-07 21:45:53 +01:00
ppc ppc/pnv: add dummy XSCOM registers for PRD initialization 2019-05-29 11:39:47 +10:00
rdma Clean up header guards that don't match their file name 2019-05-13 08:58:55 +02:00
riscv riscv: spike: Add a generic spike machine 2019-05-24 12:09:24 -07:00
s390x s390/css: handle CCW_FLAG_SKIP 2019-05-17 08:16:02 +02:00
scsi megasas: fix mapped frame size 2019-05-15 11:56:53 +02:00
sd Clean up header guards that don't match their file name 2019-05-13 08:58:55 +02:00
semihosting semihosting: enable chardev backed output for console 2019-05-28 10:28:50 +01:00
sh4 hw/usb/hcd-ohci: Move PCI-related code into a separate file 2019-05-02 08:42:17 +02:00
smbios kconfig: introduce kconfig files 2019-03-07 21:45:53 +01:00
sparc hw/sparc: Implement fw_cfg_arch_key_name() 2019-05-23 14:10:31 +02:00
sparc64 hw/sparc64: Implement fw_cfg_arch_key_name() 2019-05-23 14:10:31 +02:00
ssi hw/ssi/xilinx_spips: Avoid variable length array 2019-04-29 17:35:57 +01:00
timer grlib, gptimer: get rid of the old-style create function 2019-05-17 09:17:11 +01:00
tpm Clean up ill-advised or unusual header guards 2019-05-13 08:58:55 +02:00
tricore - qtest fixes 2019-03-08 16:31:34 +00:00
unicore32 unicore32-softmmu.mak: express dependencies with Kconfig 2019-03-07 21:46:19 +01:00
usb usb-hub: emulate per port power switching 2019-05-29 07:04:05 +02:00
vfio hw/display/ramfb: initialize fw-config space with xres/ yres 2019-05-24 09:10:29 +02:00
virtio vga: add vhost-user-gpu. 2019-05-30 13:10:00 +01:00
watchdog trace-events: Fix attribution of trace points to source 2019-03-22 16:18:07 +00:00
xen trace-events: Shorten file names in comments 2019-03-22 16:18:07 +00:00
xenpv xen: Replace few mentions of xend by libxl 2019-01-14 13:45:40 +00:00
xtensa Clean up ill-advised or unusual header guards 2019-05-13 08:58:55 +02:00
Kconfig semihosting: introduce CONFIG_SEMIHOSTING 2019-05-28 10:28:50 +01:00
Makefile.objs semihosting: move semihosting configuration into its own directory 2019-05-28 10:28:50 +01:00