On Wed, Apr 08, 2015 at 04:45:24PM +0100, Andrew Cooper wrote: > On 08/04/15 15:47, Konrad Rzeszutek Wilk wrote: > > Hey Jim, Andrew, and Ian, > > > > This is libvirt v1.2.14 + three patches: > > c82a59b libxl: drop virDomainObj lock when destroying a domain > > a1c9d30 libxl: acquire a job when destroying a domain > > 5bd5406 libxl: Move job acquisition in libxlDomainStart to callers > > > > For fun I've set up an guest with PCI passthrough and tried to save it > > (HAHAH) with an disastrous result (xc_save_helper was stuck). Probably > > due to outstanding DMA operations wreaking havoc. > > Outstanding DMA wont make any difference. It isn't (and can't) be > reflected in the logdirty bitmap, so libxc simply wont know about it. > > xc_save_helper is blocked because it has called back into the libxl with > the suspend_and_state() callback. > > i.e. libxc has requested that libxl pause the domain, and that request > is still outstanding. > > > The vcpu trace from the very bottom shows that the guest has not yet > paused itself. 1 vcpu is blocked in the hypervisor while the other look > to be in some spinlock code. Except the guest is in '---ss- ' so it _should_ be paused by now. > > ~Andrew -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list