On Wed, 2021-06-09 at 08:55 +0000, bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=53851 > > --- Comment #2 from christian.rohmann@xxxxxxxxxxxxxxx --- > Sorry for replying to this rather old bug - I was pointed to this via > https://www.linux-kvm.org/page/Nested_Guests#Limitations > > > If I may ask, is this really the last state of discussion and work on this > issue? > Looking at i.e. > > * https://github.com/qemu/qemu/commit/ebbfef2f34cfc749c045a4569dedb4f748ec024a > * > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=039aeb9deb9291f3b19c375a8bc6fa7f768996cc > > > there have been commits for the kernel as well as QEMU to support migration of > nested VMs. > AFAIK, running nested guests and migration while nested guest is running should work on both Intel and AMD, but there were lots of fixes in this area recently so a very new kernel should be used. Plus in some cases if the nested guest is 32 bit, the migration still can fail, on Intel at least, last time I checked. On AMD I just recently fixed such issue for 32 bit guest and it seems to work for me. I also know that if the nested guest is hyper-v enabled (which is a bit overkill as this brings us to a double nesting), then it crashes once in a whileafter lots of migration cycles. So there are still bugs, but overall it works. Best regards, Maxim Levitsky
