[RFC PATCH 01/28] OvmfPkg/Sec: Enable cache early to speed up booting

["Lendacky, Thomas" <thomas.lendacky@amd.com>]

From: Tom Lendacky <thomas.lendacky@amd.com>

Currently, the OVMF code relies on the hypervisor to enable the cache
support on the processor in order to improve the boot speed. However,
with SEV-ES, the hypervisor is not allowed to change the CR0 register
to enable caching.

Update the OVMF Sec support to enable caching in order to improve the
boot speed.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
 OvmfPkg/Sec/SecMain.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/OvmfPkg/Sec/SecMain.c b/OvmfPkg/Sec/SecMain.c
index 3914355cd17b..2448be0cd408 100644
--- a/OvmfPkg/Sec/SecMain.c
+++ b/OvmfPkg/Sec/SecMain.c
@@ -739,6 +739,11 @@ SecCoreStartupWithStack (
 
   ProcessLibraryConstructorList (NULL, NULL);
 
+  //
+  // Enable caching
+  //
+  AsmEnableCache ();
+
   DEBUG ((EFI_D_INFO,
     "SecCoreStartupWithStack(0x%x, 0x%x)\n",
     (UINT32)(UINTN)BootFv,
-- 
2.17.1