On Mon, Apr 30, 2012 at 12:38:13PM +0300, Michael S. Tsirkin wrote: > On Mon, Apr 30, 2012 at 11:43:19AM +0300, Gleb Natapov wrote: > > 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. > > That's what I have. I scratch my own itch. > > > Other hypervisors may use more cpuid leafs. > > But not less so no harm's done. > > > 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. > > I don't think guessing at the CPU behaviour from linux source > is the right thing to do. > That is guessing from Hyper-V specification. The best kind of guess. http://msdn.microsoft.com/en-us/library/windows/hardware/ff542700%28v=vs.85%29.aspx > I Cc'd some addresses found in MAINTAINERS in the linux > kernel. This will give more people the opportunity > to ask for their stuff to be added, if they care. > > > > Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx> > > > > > > --- > > > > > > 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. -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
