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Stefan Hajnoczi 2bbadb08ce virtio-balloon: fix QEMU 4.0 config size migration incompatibility 
The virtio-balloon config size changed in QEMU 4.0 even for existing
machine types.  Migration from QEMU 3.1 to 4.0 can fail in some
circumstances with the following error:

  qemu-system-x86_64: get_pci_config_device: Bad config data: i=0x10 read: a1 device: 1 cmask: ff wmask: c0 w1cmask:0

This happens because the virtio-balloon config size affects the VIRTIO
Legacy I/O Memory PCI BAR size.

Introduce a qdev property called "qemu-4-0-config-size" and enable it
only for the QEMU 4.0 machine types.  This way <4.0 machine types use
the old size, 4.0 uses the larger size, and >4.0 machine types use the
appropriate size depending on enabled virtio-balloon features.

Live migration to and from old QEMUs to QEMU 4.1 works again as long as
a versioned machine type is specified (do not use just "pc"!).

Originally-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20190710141440.27635-1-stefanha@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Tested-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Tested-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2019-07-12 10:56:26 -04:00
..
9pfs xen: Import other xen/io/*.h 2019-06-24 10:42:30 +01:00
acpi hw/acpi: extract acpi_add_rom_blob() 2019-06-16 16:16:52 -04:00
adc Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
alpha hw: Replace global smp variables with MachineState for all remaining archs 2019-07-05 17:08:03 -03:00
arm hw/arm/sbsa-ref: Remove unnecessary check for secure_sysmem == NULL 2019-07-08 14:11:31 +01:00
audio Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
block Revert "hw/block/pflash_cfi02: Reduce I/O accesses to 16-bit" 2019-07-09 17:14:39 +02:00
bt Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
char xen: Import other xen/io/*.h 2019-06-24 10:42:30 +01:00
core virtio-balloon: fix QEMU 4.0 config size migration incompatibility 2019-07-12 10:56:26 -04:00
cpu general: Replace global smp variables with smp machine properties 2019-07-05 17:07:36 -03:00
cris Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
display ati-vga: Fix setting offset together with pitch for r128pro 2019-07-05 09:50:33 +02:00
dma dma/rc4030: Minor code style cleanup 2019-06-26 13:25:07 +02:00
gpio Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
hppa hw: Replace global smp variables with MachineState for all remaining archs 2019-07-05 17:08:03 -03:00
hyperv Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
i2c hw/i2c/bitbang_i2c: Use in-place rather than malloc'd bitbang_i2c_interface struct 2019-07-03 10:51:35 +02:00
i386 Bugfixes. 2019-07-08 10:26:18 +01:00
ide Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
input Supply missing header guards 2019-06-12 13:20:21 +02:00
intc xics/kvm: Always set the MASKED bit if interrupt is masked 2019-07-12 15:50:00 +10:00
ipack Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
ipmi Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
isa Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
lm32 Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
m68k Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
mem Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
microblaze Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
mips hw: Replace global smp variables with MachineState for all remaining archs 2019-07-05 17:08:03 -03:00
misc hw/misc/aspeed_xdma: New device 2019-07-01 17:29:00 +01:00
moxie Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
net sunhme: ensure that RX descriptor ring overflow is indicated to client driver 2019-07-02 22:49:08 +01:00
nios2 Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
nvram Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
openrisc hw: Replace global smp variables with MachineState for all remaining archs 2019-07-05 17:08:03 -03:00
pci pcie: minor cleanups for slot control/status 2019-07-01 09:17:30 -04:00
pci-bridge xio3130_downstream: typo fix 2019-07-12 10:56:26 -04:00
pci-host i.mx7d: pci: Update PCI IRQ mapping to match HW 2019-07-01 17:28:59 +01:00
pcmcia Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
ppc machine: show if CLI option '-numa node,mem' is supported in QAPI schema 2019-07-05 17:08:03 -03:00
rdma Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
riscv hw/riscv: Replace global smp variables with machine smp properties 2019-07-05 17:07:42 -03:00
s390x hw/s390x: Replace global smp variables with machine smp properties 2019-07-05 17:08:03 -03:00
scsi virtio-scsi: restart DMA after iothread 2019-07-08 16:00:26 +02:00
sd sd: Fix out-of-bounds assertions 2019-06-21 13:25:29 +02:00
semihosting semihosting: split console_out into string and char versions 2019-06-12 17:53:22 +01:00
sh4 Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
smbios machine: Refactor smp-related call chains to pass MachineState 2019-07-05 17:07:36 -03:00
sparc hw: Replace global smp variables with MachineState for all remaining archs 2019-07-05 17:08:03 -03:00
sparc64 hw: Replace global smp variables with MachineState for all remaining archs 2019-07-05 17:08:03 -03:00
ssi aspeed/smc: add a 'sdram_base' property 2019-07-01 17:28:59 +01:00
timer hw/timer/armv7m_systick: Forbid non-privileged accesses 2019-07-04 17:25:30 +01:00
tpm hw/tpm: Only build tpm_ppi.o if any of TPM_TIS/TPM_CRB is built 2019-07-08 10:04:38 -04:00
tricore Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
unicore32 target/unicore32: Use env_cpu, env_archcpu 2019-06-10 07:03:42 -07:00
usb xen: Import other xen/io/*.h 2019-06-24 10:42:30 +01:00
vfio vfio-ccw: Test vfio_set_irq_signaling() return value 2019-07-08 12:10:37 +02:00
virtio virtio-balloon: fix QEMU 4.0 config size migration incompatibility 2019-07-12 10:56:26 -04:00
watchdog aspeed: Link SCU to the watchdog 2019-07-01 17:29:00 +01:00
xen xen: Import other xen/io/*.h 2019-06-24 10:42:30 +01:00
xenpv xen: Replace few mentions of xend by libxl 2019-01-14 13:45:40 +00:00
xtensa hw: Replace global smp variables with MachineState for all remaining archs 2019-07-05 17:08:03 -03:00
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