Re: [ANNOUNCE] kvm userspace release 6

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Michael Riepe wrote:
> vmx_get_msr() actually works fine. The problem is in vmx_vcpu_setup(),
> in the loop starting at line 1142. It tries to read all the MSRs listed
> in vmx_msr_index, but it fails for MSR_K6_STAR. With earlier releases, I
> also used to see the kernel message "kvm: msrs: 1" - that is, only
> MSR_EFER is found. According to Intel's docs, that's correct - the
> register does not exist on a Core Duo which isn't 64-bit capable (but,
> of course, on a Core 2 Duo - or a Xeon 51xx/53xx, aka "Woodcrest" and
> "Clovertown").
>   

I see now.  So the fix would be to tell the cpu the syscall feature 
doesn't exist, presumably via cpuid (which is handled in userspace).

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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