Thanks, Paolo. We will test and let you know. I'm not familiar with LWP (some reading to do there) - are there any plans to support this in future, or is this just something that we're not interested in emulating?
Best regards, Owen On Mon, Nov 11, 2013 at 3:25 PM, Paolo Bonzini <pbonz...@redhat.com> wrote: > Il 11/11/2013 15:30, Owen Tuz ha scritto: > > Hi all, > > > > We've been seeing a problem lately running FreeBSD 9.1 and 9.2 (latest > > stable) which causes the guest to crash during boot when QEMU is run on > > an AMD processor with the 'xsave' flag set. > > > > To reproduce this behaviour: > > > > - Boot a FreeBSD 9.1 or 9.2 guest or even installation CD on an AMD > > processor with xsave enabled. Use '-cpu host'. > > > > - After the bootloader, the guest will crash almost immediately with the > > message 'kernel trap 12 with interrupts disabled'. This occurs before > > any disks are loaded, so it's not possible to get a memory dump from the > > guest OS for backtrace. > > > > - Boot again with '-cpu host,-xsave'. The guest should boot successfully. > > This is probably cause by the "lightweight profiling" XSAVE extension. > KVM does not support it. Using "-cpu host" may show problems when the > CPU has features that are not supported by KVM. > > It's possible though that this has been recently fixed. Please try > branch "next" of git://git.kernel.org/pub/scm/virt/kvm/kvm.git and > report back. > > Paolo >
