Re: [Qemu-devel] [PATCH] i386: remove the 'INTEL_PT' CPUID bit from named CPU models

[Paolo Bonzini <pbonzini@redhat.com>]

On 22/12/18 02:01, Robert Hoo wrote:
> On Fri, 2018-12-21 at 16:27 +0100, Paolo Bonzini wrote:
>> On 21/12/18 16:22, Philippe Mathieu-Daudé wrote:
>>> Hi Paolo,
>>>
>>> On 12/21/18 7:30 AM, Paolo Bonzini wrote:
>>>> From: Robert Hoo <robert.hu@linux.intel.com>
>>>>
>>>> Processor tracing is not yet implemented for KVM and it will be
>>>> an
>>>> opt in feature requiring a special module parameter.
>>>> Disable it, because it is wrong to enable it by default and
>>>> it is impossible that no one has ever used it.
>>>>
>>>> Cc: qemu-stable@nongnu.org
>>>
>>> Does this patch misses Robert S-o-b?
>>> Signed-off-by: Robert Hoo <robert.hu@linux.intel.com>
> 
> Paolo's right. It didn't come from me.
>>
>> No, the author is wrong, it should be me.  "git commit -c" apparently
>> copies the author from the original commit.
>>
>> Paolo
> 
> Hi Paolo, would you hold on INTEL_PT removal for a moment? I think I
> need Luwei's double confirm.

I'm aware of Luwei's patches, they will be in 4.21.  As mentioned in the
commit message, they will be an opt-in feature, not enabled by default;
the default is system-wide tracing and no INTEL_PT CPUID bit available
in the guest.

Paolo