On 30/07/20 17:14, Steve Sistare wrote: > The first set of patches adds the cprsave and cprload commands to save and > restore VM state, and allow the host kernel to be updated and rebooted in > between. The VM must create guest RAM in a persistent shared memory file, > such as /dev/dax0.0 or persistant /dev/shm PKRAM as proposed in > https://lore.kernel.org/lkml/1588812129-8596-1-git-send-email-anthony.yzn...@oracle.com/ > > cprsave stops the VCPUs and saves VM device state in a simple file, and > thus supports any type of guest image and block device. The caller must > not modify the VM's block devices between cprsave and cprload.
Stupid question, what does cpr stand for? If it is checkpoint/restore, please spell it out. Also, how does the functionality compare to xen-save-devices-state and xen-load-devices-state? > cprsave and cprload support guests with vfio devices if the caller first > suspends the guest by issuing guest-suspend-ram to the qemu guest agent. > The guest drivers suspend methods flush outstanding requests and re- > initialize the devices, and thus there is no device state to save and > restore. This probably should be allowed even for regular migration. Can you generalize the code as a separate series? Thanks, Paolo
