Our code paths for saving or migrating a VM are full of functions that return void, leaving no opportunity for a device to cancel a migration, either from error or incompatibility. The ivshmem driver attempted to solve this with a no_migrate flag on the save state entry. I think the more generic and flexible way to solve this is to allow driver save functions to fail. This series implements that and converts ivshmem to uses a set_params function to NAK migration much earlier in the processes. This touches a lot of files, but bulk of those changes are simply s/void/int/ and tacking a "return 0" to the end of functions. Thanks,
Alex --- Alex Williamson (6): savevm: Remove register_device_unmigratable() savevm: Allow set_params and save_live_state to error virtio: Allow virtio_save() errors pci: Allow pci_device_save() to return error savevm: Allow vmsd->pre_save to return error savevm: Allow SaveStateHandler() to return error block-migration.c | 4 +- hw/adb.c | 8 +++- hw/ads7846.c | 4 +- hw/arm_gic.c | 4 +- hw/arm_timer.c | 6 ++- hw/armv7m_nvic.c | 4 +- hw/cuda.c | 4 +- hw/fdc.c | 3 + hw/g364fb.c | 4 +- hw/grackle_pci.c | 4 +- hw/gt64xxx.c | 4 +- hw/heathrow_pic.c | 4 +- hw/hpet.c | 3 + hw/hw.h | 12 ++---- hw/i2c.c | 3 + hw/ide/core.c | 4 +- hw/ivshmem.c | 30 +++++++++++---- hw/lsi53c895a.c | 4 +- hw/m48t59.c | 4 +- hw/mac_dbdma.c | 4 +- hw/mac_nvram.c | 4 +- hw/max111x.c | 4 +- hw/mipsnet.c | 4 +- hw/mst_fpga.c | 3 + hw/nand.c | 3 + hw/openpic.c | 4 +- hw/pci.c | 9 +++- hw/pci.h | 2 - hw/piix4.c | 4 +- hw/pl011.c | 4 +- hw/pl022.c | 4 +- hw/pl061.c | 4 +- hw/ppc4xx_pci.c | 11 ++++- hw/ppce500_pci.c | 11 ++++- hw/pxa2xx.c | 28 ++++++++++---- hw/pxa2xx_dma.c | 4 +- hw/pxa2xx_gpio.c | 4 +- hw/pxa2xx_keypad.c | 3 + hw/pxa2xx_lcd.c | 4 +- hw/pxa2xx_mmci.c | 4 +- hw/pxa2xx_pic.c | 4 +- hw/pxa2xx_timer.c | 4 +- hw/rc4030.c | 4 +- hw/rtl8139.c | 4 +- hw/serial.c | 3 + hw/spitz.c | 14 +++++-- hw/ssd0323.c | 4 +- hw/ssi-sd.c | 4 +- hw/stellaris.c | 20 +++++++--- hw/stellaris_enet.c | 4 +- hw/stellaris_input.c | 4 +- hw/syborg_fb.c | 4 +- hw/syborg_interrupt.c | 3 + hw/syborg_keyboard.c | 3 + hw/syborg_pointer.c | 3 + hw/syborg_rtc.c | 4 +- hw/syborg_serial.c | 4 +- hw/syborg_timer.c | 4 +- hw/tsc2005.c | 4 +- hw/tsc210x.c | 4 +- hw/twl92230.c | 3 + hw/unin_pci.c | 4 +- hw/usb-uhci.c | 3 + hw/virtio-balloon.c | 9 +++- hw/virtio-blk.c | 10 ++++- hw/virtio-net.c | 11 ++++- hw/virtio-pci.c | 10 ++++- hw/virtio-serial-bus.c | 10 ++++- hw/virtio.c | 14 +++++-- hw/virtio.h | 4 +- hw/wm8750.c | 3 + hw/zaurus.c | 4 +- qemu-common.h | 2 - savevm.c | 88 +++++++++++++++++++------------------------ slirp/slirp.c | 6 ++- target-arm/machine.c | 3 + target-cris/machine.c | 3 + target-i386/machine.c | 7 ++- target-microblaze/machine.c | 3 + target-mips/machine.c | 3 + target-ppc/machine.c | 3 + target-s390x/machine.c | 3 + target-sparc/machine.c | 3 + 83 files changed, 365 insertions(+), 181 deletions(-)