Re: [PATCH v3 1/1] OvmfPkg/PlatformPei: clear CPU caches

[Laszlo Ersek <lersek@redhat.com>]

On 10/02/18 15:27, Anthony PERARD wrote:
> On Tue, Oct 02, 2018 at 04:17:25PM +0400, marcandre.lureau@redhat.com wrote:
>> From: Marc-André Lureau <marcandre.lureau@redhat.com>
>>
>> This is for conformance with the TCG "Platform Reset Attack Mitigation
>> Specification". Because clearing the CPU caches at boot doesn't impact
>> performance significantly, do it unconditionally, for simplicity's
>> sake.
>>
>> Flush the cache on all logical processors, thanks to
>> EFI_PEI_MP_SERVICES_PPI and CacheMaintenanceLib.
>>
>> Cc: Jordan Justen <jordan.l.justen@intel.com>
>> Cc: Laszlo Ersek <lersek@redhat.com>
>> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>> Cc: Anthony Perard <anthony.perard@citrix.com>
>> Cc: Julien Grall <julien.grall@linaro.org>
>> Contributed-under: TianoCore Contribution Agreement 1.1
>> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> 
> That patch works for me on Xen. I can still boot guests with the patch
> applied, with either 1 or 4 vcpus assigned to the guest:
> 
> Tested-by: Anthony PERARD <anthony.perard@citrix.com>

Thanks a lot!
Laszlo