On Thu, Aug 09, 2018 at 07:18:52PM -0300, Eduardo Habkost wrote: > Enabling TOPOEXT is always allowed, but it can't be enabled > blindly by "-cpu host" because it may make guests crash if the > rest of the cache topology information isn't provided or isn't > consistent. > > This addresses the bug reported at: > https://bugzilla.redhat.com/show_bug.cgi?id=1613277 > > Signed-off-by: Eduardo Habkost <ehabk...@redhat.com> > --- > target/i386/cpu.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/target/i386/cpu.c b/target/i386/cpu.c > index 723e02221e..3ac627978f 100644 > --- a/target/i386/cpu.c > +++ b/target/i386/cpu.c > @@ -849,6 +849,12 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] > = { > }, > .cpuid_eax = 0x80000001, .cpuid_reg = R_ECX, > .tcg_features = TCG_EXT3_FEATURES, > + /* > + * TOPOEXT is always allowed but can't be enabled blindly by > + * "-cpu host", as it requires consistent cache topology info > + * to be provided so it doesn't confuse guests. > + */ > + .no_autoenable_flags = CPUID_EXT3_TOPOEXT, > }, > [FEAT_C000_0001_EDX] = { > .feat_names = {
Can confirm that this fixes the problem observed on the original AMD Phenom machine, using qemu from git (@6ad908053) + your patch. Therefore: Tested-by: Richard W.M. Jones <rjo...@redhat.com> Thanks, Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into KVM guests. http://libguestfs.org/virt-v2v
