*It works*. I built and deployed the linux 4.16.0-rc7 kernel on my debian 9 guest running over VMWare. Now libguestfs-test-tool just works fine when qemu picks the default machine type pc-i440fx-2.8
$> uname -a Linux tanmoy-deb-host 4.16.0-rc7 #1 SMP Mon Mar 26 09:52:54 UTC 2018 x86_64 GNU/Linux On Mon, 26 Mar 2018 at 16:52 Tanmoy Sinha <[email protected]> wrote: > I am trying that out. Debian 9 (stretch) backports still doesn't have 4.16 > kernel. > > So I building the kernel from the source. Will keep you posted. > > On Mon, 26 Mar 2018 at 13:00 Richard W.M. Jones <[email protected]> wrote: > >> [Adding Paolo and Vitaly, but FYI only as the bug seems to have an >> upstream fix already.] >> >> On Mon, Mar 26, 2018 at 09:13:45AM +0300, Roman Kagan wrote: >> > On Sat, Mar 24, 2018 at 03:11:12PM +0000, Richard W.M. Jones wrote: >> > > On Sat, Mar 24, 2018 at 03:08:16PM +0000, Tanmoy Sinha wrote: >> > > > Even though force_tcg works, I intend not to run it on emulation. >> Is there >> > > > way I can run it over kvm? The other observation is, without >> force_tcg if I >> > > > use the machine type as *pc-i440fx-2.**1*,accel=kvm it works fine. >> The >> > > > default machine type for my host *pc-i440fx-2.8, *which seems to >> crib. >> > > >> > > I don't know, but this is basically a bug in VMware, so you need >> > > to ask them to fix their nested KVM-on-ESXi use case. >> > >> > We've encountered this problem, too. >> > >> > Strictly speaking, the bug is not in VMWare, but rather in KVM: on >> > EPT_MISCONFIG vmexits it assumed the processor to set the instuction >> > length field. This wasn't mandated by the spec but the real processors >> > did that. OTOH some hypervisors (VMWare, Hyper-V) didn't do that for >> > the nested hypervisor. As a result, when handling MMIO the guest >> > instruction pointer didn't get advanced, i.e. the guest got stuck in an >> > infinite loop. >> > >> > The difference between the old and the new machine type is that the >> > latter turns on newer virtio protocol version employing MMIO, exposing >> > this bug. >> > >> > The fix is commit d391f1207067268261add0485f0f34503539c5b0 which went >> > into 4.16-rc1. >> >> Can you (Tanmoy) please try a newer kernel inside the VMware guest? >> >> Rich. >> >> -- >> Richard Jones, Virtualization Group, Red Hat >> http://people.redhat.com/~rjones >> Read my programming and virtualization blog: http://rwmj.wordpress.com >> libguestfs lets you edit virtual machines. Supports shell scripting, >> bindings from many languages. http://libguestfs.org >> > _______________________________________________ > Libguestfs mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/libguestfs
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