Re: monitor flag on native kvm tool guest

[Sasha Levin <levinsasha928@gmail.com>]

On Thu, 2011-12-01 at 15:48 +0200, Avi Kivity wrote:
> On 12/01/2011 03:37 PM, Daniele Carollo wrote:
> > Hi,
> > my name's Daniele and I'm using the native linux kvm tool.
> > If I try to execute it in this way ./kvm run -d ~/linux-0.2.img I get
> > a kernel panic like this: http://paste.org/41673
> > Only using the addictional option -p "idle=halt" I can run a virtual machine.
> > Printing cat /proc/cpuinfo on the host i get http://paste.org/41663
> > and on the guest http://paste.org/41664
> > Sashal from the native linux kvm tool team noticed that there is the
> > monitor cpu flag even on the guest.
> >
> 
> from cpuid.c:
> 
>     /* cpuid 1.ecx */
>     const u32 kvm_supported_word4_x86_features =
>         F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ |
> 
> so either the masking later on is subtly wrong, or kvm tool doesn't pass
> it on correctly, or Linux ignores it.
> 
> Please run the attached program on the host and post its output.
> 

Avi,

We tested it with qemu where Daniele has reported that monitor is also
visible in the cpuid there.

-- 

Sasha.