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From: =?UTF-8?B?TWFyYy1BbmRyw6kgTHVyZWF1?= <marcandre.lureau@gmail.com>
Date: Thu, 27 Sep 2018 14:59:17 +0400
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To: edk2-devel@lists.01.org
Cc: Chao Zhang <chao.b.zhang@intel.com>, Laszlo Ersek <lersek@redhat.com>, 
 michael.d.kinney@intel.com, Paolo Bonzini <pbonzini@redhat.com>
Subject: TCG MOR and processor caches
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Hi,

According to "TCG Platform Reset Attack Mitigation Specification", if
MOR bit is set, "it must initiate a vendor-specific method that
overwrites all of system memory and the processor caches"

In QuarkPlatformPkg/Platform/Pei/PlatformInit/MemoryCallback.c and
QuarkPlatformPkg/Platform/Pei/PlatformInit/MrcWrapper.c, there is some
code to clear RAM, however I don't see code that would clear the
processor caches.

For edk2/qemu, Paolo suggested it may be simpler to clear the cache
unconditionally. How would you implement that? Using
EFI_CPU_ARCH_PROTOCOL.FlushDataCache? (or direct AsmWbinvd call)

thanks

--=20
Marc-Andr=C3=A9 Lureau