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xen-devel
Re: [Xen-devel] Pending Disk io requests during live migration
one modification:
register_savevm() in tools/ioemu/vl.c is simply used to register the
save & load routines......... register_savevm() is called in
tools/ioemu/hw/ide.c:pci_piix_ide_init to register pci_ide_save() and
pci_ide_load() as the save & load routines for IDE disks.......
But I am still unsure as to where these save/load routines for IDE disks
get invoked....
Kaushik Bhandankar wrote:
Hello
I am trying to implement functionality in fully-virtualized xen
wherein the responses to the pending disk I/O requests during live VM
migration get trasnsferred to the new VMM form the old VMM.
Specifically, I am looking at IDE disk (tools/ioemu/hw/ide.c)
Basically, ide.c:pci_ide_save() saves the state of the IDE disk in a
QEMUFile and this file is sent over the network (can somebody point me
to the code where this happens ??)) so that the new VMM (where the VM
has migrated) invokes ide.c:pci_ide_load() to retrieve the IDE Disk
contents form the file. As of now, the pending disk I/O requests do
not get saved in this file so these pending disk I/O requests are not
available when executing pci_ide_load().
I am still trying to figure out where the pending Disk I/O requests
get stored in the VMM so that during live VM migration, these requests
can be put in the QEMUFile (As mentioned above)
Also, looks like tools/ioemu/vl.c:register_savevm() seems to be
invoking pci_ide_save()/pci_ide_load() methods but I am still looking
for all possible scenarios in which pci_ide_save()/pci_ide_load() gets
invoked.
Any help in locating the code would be greatly appreciated.
-Kaushik
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