Re: [kvm-unit-tests PATCH] x86: Use "-cpu host" for PCID tests

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On Wed, Feb 05, 2020 at 12:37:11PM +0100, Vitaly Kuznetsov wrote:
> Sean Christopherson <sean.j.christopherson@xxxxxxxxx> writes:
> 
> > Use the host CPU model for the PCID tests to allow testing the various
> > combinations of PCID and INVPCID enabled/disabled without having to
> > manually change the kvm-unit-tests command line.  I.e. give users the
> > option of changing the command line *OR* running on a (virtual) CPU
> > with or without PCID and/or INVPCID.
> >
> > Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
> > ---
> >  x86/unittests.cfg | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/x86/unittests.cfg b/x86/unittests.cfg
> > index aae1523..25f4535 100644
> > --- a/x86/unittests.cfg
> > +++ b/x86/unittests.cfg
> > @@ -228,7 +228,7 @@ extra_params = --append "10000000 `date +%s`"
> >  
> >  [pcid]
> >  file = pcid.flat
> > -extra_params = -cpu qemu64,+pcid
> > +extra_params = -cpu host
> >  arch = x86_64
> >  
> >  [rdpru]
> 
> Reviewed-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
> 
> Actually, is there any reason for *not* using '-cpu host' in any of the
> tests?

Emulation tests, e.g. for UMIP, will want "-cpu <base>,+<feature>", but I
can't think of any reason why <base> shouldn't be host.



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