Re: [PATCH kvm-unit-tests] x86: provide enabled and disabled variation of the PCID test

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On Wed, Feb 05, 2020 at 07:49:04AM -0800, Sean Christopherson wrote:
> On Wed, Feb 05, 2020 at 04:29:40PM +0100, Paolo Bonzini wrote:
> > The PCID test checks for exceptions when PCID=0 or INVPCID=0 in
> > CPUID.  Cover that by adding a separate testcase with different
> > CPUID.
> > 
> > Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> > ---
> >  x86/unittests.cfg | 7 ++++++-
> >  1 file changed, 6 insertions(+), 1 deletion(-)
> > 
> > diff --git a/x86/unittests.cfg b/x86/unittests.cfg
> > index aae1523..f2401eb 100644
> > --- a/x86/unittests.cfg
> > +++ b/x86/unittests.cfg
> > @@ -228,7 +228,12 @@ extra_params = --append "10000000 `date +%s`"
> >  
> >  [pcid]
> >  file = pcid.flat
> > -extra_params = -cpu qemu64,+pcid
> > +extra_params = -cpu qemu64,+pcid,+invpcid
> > +arch = x86_64
> > +
> > +[pcid-disabled]
> > +file = pcid.flat
> > +extra_params = -cpu qemu64,-pcid,-invpcid
> >  arch = x86_64
> 
> Hrm, but "-cpu qemu64,-pcid,+invpcid" is arguably the more interesting test
> from a KVM perspective because of the logic in KVM to hide invpcid if pcid
> isn't supported.
> 
> And +pcid,-invpcid is also interesting.
> 
> Is there an easy-ish change that can be made to allow iterating over
> multiple CPU configurations for single test case?
>

Just a small change to Paolo's patch

[pcid]
file = pcid.flat
extra_params = -cpu qemu64,+pcid,+invpcid
arch = x86_64
group = pcid

[pcid-disabled]
file = pcid.flat
extra_params = -cpu qemu64,-pcid,-invpcid
arch = x86_64
group = pcid

[pcid-more-interesting]
file = pcid.flat
extra_params = -cpu qemu64,-pcid,+invpcid
arch = x86_64
group = pcid

Then run the group with ./run_tests.sh -g pcid

Thanks,
drew




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