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OvmfPkg/PlatformPei: clear CPU caches

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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>
Tested-by: Anthony PERARD <anthony.perard@citrix.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
[lersek@redhat.com: remove bogus Message-Id line from commit msg]
This commit is contained in:
Marc-André Lureau
2018-10-02 16:17:25 +04:00
committed by Laszlo Ersek
parent c0b1f749ef
commit d20ae95a13
4 changed files with 125 additions and 0 deletions
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1
OvmfPkg/PlatformPei/Platform.c
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@@ -672,6 +672,7 @@ InitializePlatform (
NoexecDxeInitialization ();
}
InstallClearCacheCallback ();
AmdSevInitialize ();
MiscInitialization ();
InstallFeatureControlCallback ();