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

[Paolo Bonzini <pbonzini@redhat.com>]

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