RE: [PATCH v1 0/3] Remove the limitation of Intel PT CPUID info

["Kang, Luwei" <luwei.kang@intel.com>]

> -----Original Message-----
> From: Kang, Luwei <luwei.kang@intel.com>
> Sent: Tuesday, February 25, 2020 5:38 AM
> To: pbonzini@redhat.com; rth@twiddle.net; ehabkost@redhat.com
> Cc: qemu-devel@nongnu.org; Strong, Beeman <beeman.strong@intel.com>;
> Kang, Luwei <luwei.kang@intel.com>
> Subject: [PATCH v1 0/3] Remove the limitation of Intel PT CPUID info
> 
> The Intel PT feature includes some sub-features(CPUID.(EAX=14H,ECX=0H))
> and these sub-features are different on different HW platforms. To make the
> live migration safety(get the same CPUID info with same cpu model on
> different HW platform), the current Intel PT CPUID information is set to a
> constant value(from ICELAKE Server).
> 
> It will block the new feature in the later HW platform. what's more, the support
> of "IP payloads" will disable the Intel PT in KVM guest(patch 1) but it will come
> soon.
> 
> This patchset remove this limitation and expose all the capabilities to KVM
> guest. As it will break the live migration safe, Intel PT will be masked as
> unmigratable.

Ping.

Thanks,
Luwei Kang

> 
> Luwei Kang (3):
>   i386: Remove the limitation of IP payloads for Intel PT
>   i386: Remove the CPUID limitation of Intel PT
>   i386: Mark the 'INTEL_PT' CPUID bit as unmigratable
> 
>  target/i386/cpu.c | 69 ++++---------------------------------------------------
>  1 file changed, 5 insertions(+), 64 deletions(-)
> 
> --
> 1.8.3.1