[PATCH kvm-unit-tests] access: disable phys-bits=36 for now

[PATCH kvm-unit-tests] access: disable phys-bits=36 for now

[Paolo Bonzini]

Support for guest-MAXPHYADDR < host-MAXPHYADDR is not upstream yet,
it should not be enabled.  Otherwise, all the pde.36 and pte.36
fail and the test takes so long that it times out.

Reported-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 x86/unittests.cfg | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/x86/unittests.cfg b/x86/unittests.cfg
index bf0d02e..d658bc8 100644
--- a/x86/unittests.cfg
+++ b/x86/unittests.cfg
@@ -116,7 +116,7 @@ extra_params = -cpu qemu64,+x2apic,+tsc-deadline -append tscdeadline_immed
 [access]
 file = access.flat
 arch = x86_64
-extra_params = -cpu host,phys-bits=36
+extra_params = -cpu host
 
 [smap]
 file = smap.flat
-- 
2.26.2

Re: [PATCH kvm-unit-tests] access: disable phys-bits=36 for now

[Vitaly Kuznetsov]

Paolo Bonzini <pbonzini@redhat.com> writes:

> Support for guest-MAXPHYADDR < host-MAXPHYADDR is not upstream yet,
> it should not be enabled.  Otherwise, all the pde.36 and pte.36
> fail and the test takes so long that it times out.
>
> Reported-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  x86/unittests.cfg | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/x86/unittests.cfg b/x86/unittests.cfg
> index bf0d02e..d658bc8 100644
> --- a/x86/unittests.cfg
> +++ b/x86/unittests.cfg
> @@ -116,7 +116,7 @@ extra_params = -cpu qemu64,+x2apic,+tsc-deadline -append tscdeadline_immed
>  [access]
>  file = access.flat
>  arch = x86_64
> -extra_params = -cpu host,phys-bits=36
> +extra_params = -cpu host
>  
>  [smap]
>  file = smap.flat

Works both VMX and SVM, thanks!

Tested-by: Vitaly Kuznetsov <vkuznets@redhat.com>

-- 
Vitaly

Re: [PATCH kvm-unit-tests] access: disable phys-bits=36 for now

[Sean Christopherson]

On Thu, May 28, 2020 at 06:29:44PM +0200, Vitaly Kuznetsov wrote:
> Paolo Bonzini <pbonzini@redhat.com> writes:
> 
> > Support for guest-MAXPHYADDR < host-MAXPHYADDR is not upstream yet,
> > it should not be enabled.  Otherwise, all the pde.36 and pte.36
> > fail and the test takes so long that it times out.
> >
> > Reported-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> > Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> > ---
> >  x86/unittests.cfg | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/x86/unittests.cfg b/x86/unittests.cfg
> > index bf0d02e..d658bc8 100644
> > --- a/x86/unittests.cfg
> > +++ b/x86/unittests.cfg
> > @@ -116,7 +116,7 @@ extra_params = -cpu qemu64,+x2apic,+tsc-deadline -append tscdeadline_immed
> >  [access]
> >  file = access.flat
> >  arch = x86_64
> > -extra_params = -cpu host,phys-bits=36
> > +extra_params = -cpu host
> >  
> >  [smap]
> >  file = smap.flat
> 
> Works both VMX and SVM, thanks!

What's the status of the "guest-MAXPHYADDR < host-MAXPHYADDR" work?  I ask
because the AC_PTE_BIT51 and AC_PDE_BIT51 subtests are broken on CPUs with
52 bit PAs.  Is it worth sending a patch to temporarily disable those tests
if MAXPHYADDR=52?

Re: [PATCH kvm-unit-tests] access: disable phys-bits=36 for now

[Paolo Bonzini]

On 28/05/20 23:45, Sean Christopherson wrote:
> On Thu, May 28, 2020 at 06:29:44PM +0200, Vitaly Kuznetsov wrote:
>> Paolo Bonzini <pbonzini@redhat.com> writes:
>>
>>> Support for guest-MAXPHYADDR < host-MAXPHYADDR is not upstream yet,
>>> it should not be enabled.  Otherwise, all the pde.36 and pte.36
>>> fail and the test takes so long that it times out.
>>>
>>> Reported-by: Vitaly Kuznetsov <vkuznets@redhat.com>
>>> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
>>> ---
>>>  x86/unittests.cfg | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/x86/unittests.cfg b/x86/unittests.cfg
>>> index bf0d02e..d658bc8 100644
>>> --- a/x86/unittests.cfg
>>> +++ b/x86/unittests.cfg
>>> @@ -116,7 +116,7 @@ extra_params = -cpu qemu64,+x2apic,+tsc-deadline -append tscdeadline_immed
>>>  [access]
>>>  file = access.flat
>>>  arch = x86_64
>>> -extra_params = -cpu host,phys-bits=36
>>> +extra_params = -cpu host
>>>  
>>>  [smap]
>>>  file = smap.flat
>>
>> Works both VMX and SVM, thanks!
> 
> What's the status of the "guest-MAXPHYADDR < host-MAXPHYADDR" work?

Mohammed was working on it, we should have it in 5.9.

> I ask because the AC_PTE_BIT51 and AC_PDE_BIT51 subtests are broken
> on CPUs with 52 bit PAs.  Is it worth sending a patch to temporarily
> disable those tests if MAXPHYADDR=52?
It's a QEMU bug that it does not enable host_phys_bits=on by default for
"-cpu host".  For now I'll tweak this patch to add it manually.

Paolo

Re: [PATCH kvm-unit-tests] access: disable phys-bits=36 for now

[Mohammed Gamal]

On Fri, 2020-05-29 at 10:48 +0200, Paolo Bonzini wrote:
> On 28/05/20 23:45, Sean Christopherson wrote:
> > On Thu, May 28, 2020 at 06:29:44PM +0200, Vitaly Kuznetsov wrote:
> > > Paolo Bonzini <pbonzini@redhat.com> writes:
> > > 
> > > > Support for guest-MAXPHYADDR < host-MAXPHYADDR is not upstream
> > > > yet,
> > > > it should not be enabled.  Otherwise, all the pde.36 and pte.36
> > > > fail and the test takes so long that it times out.
> > > > 
> > > > Reported-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> > > > Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> > > > ---
> > > >  x86/unittests.cfg | 2 +-
> > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > > 
> > > > diff --git a/x86/unittests.cfg b/x86/unittests.cfg
> > > > index bf0d02e..d658bc8 100644
> > > > --- a/x86/unittests.cfg
> > > > +++ b/x86/unittests.cfg
> > > > @@ -116,7 +116,7 @@ extra_params = -cpu qemu64,+x2apic,+tsc-
> > > > deadline -append tscdeadline_immed
> > > >  [access]
> > > >  file = access.flat
> > > >  arch = x86_64
> > > > -extra_params = -cpu host,phys-bits=36
> > > > +extra_params = -cpu host
> > > >  
> > > >  [smap]
> > > >  file = smap.flat
> > > 
> > > Works both VMX and SVM, thanks!
> > 
> > What's the status of the "guest-MAXPHYADDR < host-MAXPHYADDR" work?
> 
> Mohammed was working on it, we should have it in 5.9.
> 
> > I ask because the AC_PTE_BIT51 and AC_PDE_BIT51 subtests are broken
> > on CPUs with 52 bit PAs.  Is it worth sending a patch to
> > temporarily
> > disable those tests if MAXPHYADDR=52?
> It's a QEMU bug that it does not enable host_phys_bits=on by default
> for
> "-cpu host".  For now I'll tweak this patch to add it manually.
> 
> Paolo
> 

I actually did send a fix earlier

https://www.spinics.net/lists/kvm/msg215716.html