Re: [Qemu-devel] [PATCH 1/2] [RFC] Make vmport report the processor speed

[François Revol]

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> On 06.01.2009, at 23:33, Jamie Lokier <address@hidden> wrote:
>
> > Alexander Graf wrote:
> >> If VMware ESX finds itself virtualized (read: inside VMware), it
> >> reads the TSC speed from its backdoor, because measuring the TSC
> >> inside a VM is not exact.
> >>
> >> This patch implements a hacky way to detect the TSC speed and
> > > passes
> >> that through to the VM. I am open to suggestions on how to improve
> >> the behavior.  It also adds a magic return value of 2 on the
> > > version
> >> return, which is required by VMware ESX.  WARNING: This
> >> implementation breaks on non-x86 hosts!
> >
> > If you run _this_ code as a guest inside itself, shouldn't it
> > _call_
> > VMPORT_CMD_GETPROCSPEED to get the value? :-)
>
> I don't think doing vmware esx in qemu in vmware us that much of a
> valid scenario right now ;).
>
> But I agree with anthony here - not telling vmware esx that it's
> running virtualized might be the best.
>

As I said, it would not only benefit esx.
Haiku also would likely work much better this way, and possibly BeOS
with a small driver to recalibrate it (I already rewrote such a driver
once, but it was just forcing it using a value from some settings that
were to be taken from a real machine).

François.