[Xen-devel] Commit 331b51 breaks live migration on FreeBSD/Xen dom0

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

Hello,

Commit 331b51 "xen: don't use xenstore to save/restore physmap
anymore" breaks live migration on FreeBSD dom0. I've checked reverting
just this specific commit and live migration works again.

The symptoms are the following, xl migrate will fail with:

migration target: Ready to receive domain.
Saving to migration stream new xl format (info 0x3/0x0/1415)
Loading new save file <incoming migration stream> (new xl fmt info 0x3/0x0/1415)
 Savefile contains xl domain config in JSON format
Parsing config from <saved>
xc: info: Saving domain 18, type x86 HVM
xc: info: Found x86 HVM domain from Xen 4.11
xc: info: Restoring domain
xc: info: Restore successful
xc: info: XenStore: mfn 0xfeffc, dom 0, evt 1
xc: info: Console: mfn 0xfefff, dom 0, evt 2
libxl: error: libxl_dm.c:2427:device_model_spawn_outcome: Domain 19:domain 19 
device model: spawn failed (rc=-3)
libxl: error: libxl_create.c:1562:domcreate_devmodel_started: Domain 19:device 
model did not start: -3
libxl: error: libxl_dm.c:2541:kill_device_model: Device Model already exited
libxl: error: libxl_domain.c:1034:libxl__destroy_domid: Domain 19:Non-existant 
domain
libxl: error: libxl_domain.c:993:domain_destroy_callback: Domain 19:Unable to 
destroy guest
libxl: error: libxl_domain.c:920:domain_destroy_cb: Domain 19:Destruction of 
domain failed
migration target: Domain creation failed (code -3).
libxl: error: libxl_utils.c:510:libxl_read_exactly: file/stream truncated 
reading ready message from migration receiver stream
libxl: info: libxl_exec.c:118:libxl_report_child_exitstatus: migration 
transport process [12952] exited with error status 1
Migration failed, resuming at sender.

The log of the incoming QEMU is:

qemu-system-i386: -serial pty: char device redirected to /dev/pts/4 (label 
serial0)
xen: shared page at pfn feff0
xen: buffered io page at pfn feff1
xen: buffered io evtchn is 4
xen_mapcache: xen_map_cache_init, nr_buckets = 8000 size 1572864
xen_ram_alloc: do not alloc 1f800000 bytes of ram at 0 when runstate is 
INMIGRATE
xen_ram_alloc: do not alloc 800000 bytes of ram at 1f800000 when runstate is 
INMIGRATE
xen_ram_alloc: do not alloc 10000 bytes of ram at 20000000 when runstate is 
INMIGRATE
xen_ram_alloc: do not alloc 40000 bytes of ram at 20010000 when runstate is 
INMIGRATE
VNC server running on 0.0.0.0:5900
xen: mapping vram to f0000000 - f0800000
Replacing a dummy mapcache entry for 000000001f800000 with 00000000f0000000
Assertion failed: (p && p == memory_region_get_ram_ptr(mr)), function 
xen_add_to_physmap, file 
/usr/ports/sysutils/xen-tools/work/xen-4.11.1/tools/qemu-xen/hw/i386/xen/xen-hvm.c,
 line 392.

This is with Xen 4.11.1.

Thanks, Roger.

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