On Sun, Apr 29, 2012 at 01:10:21PM +0300, Michael S. Tsirkin wrote: > The following makes 'x86info -r' dump kvm cpu ids > (signature+features) when running in a vm. > > On the guest we see the signature and the features: > eax in: 0x40000000, eax = 00000000 ebx = 4b4d564b ecx = 564b4d56 edx = > 0000004d > eax in: 0x40000001, eax = 0100007b ebx = 00000000 ecx = 00000000 edx = > 00000000 > > On the host it just adds a couple of zero lines: > eax in: 0x40000000, eax = 00000000 ebx = 00000000 ecx = 00000000 edx = > 00000000 > eax in: 0x40000001, eax = 00000000 ebx = 00000000 ecx = 00000000 edx = > 00000000 > This is too KVM specific. Other hypervisors may use more cpuid leafs. As far as I see Hyper-V uses 5 and use cpuid.0x40000000.eax as max cpuid leaf available. Haven't checked Xen or VMWare.
> Signed-off-by: Michael S. Tsirkin <[email protected]> > > --- > > Dave - not sure whether there's a mailing list for x86info. > The patch is on top of the master branch in > git://git.codemonkey.org.uk/x86info.git > > Thanks! > > diff --git a/x86info.c b/x86info.c > index 22c4734..dee5ed1 100644 > --- a/x86info.c > +++ b/x86info.c > @@ -44,6 +44,7 @@ static void display_detailed_info(struct cpudata *cpu) > > if (cpu->maxei2 >=0xC0000000) > dump_raw_cpuid(cpu->number, 0xC0000000, cpu->maxei2); > + dump_raw_cpuid(cpu->number, 0x40000000, 0x40000001); > } > > if (show_cacheinfo) { -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
