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From: "Lendacky, Thomas via groups.io" <thomas.lendacky=amd.com@groups.io>
To: <devel@edk2.groups.io>
CC: Ard Biesheuvel <ardb+tianocore@kernel.org>, Erdem Aktas
<erdemaktas@google.com>, Gerd Hoffmann <kraxel@redhat.com>, Jiewen Yao
<jiewen.yao@intel.com>, Laszlo Ersek <lersek@redhat.com>, Liming Gao
<gaoliming@byosoft.com.cn>, Michael D Kinney <michael.d.kinney@intel.com>,
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<michael.roth@amd.com>
Subject: [edk2-devel] [PATCH v3 20/24] OvmfPkg/BaseMemEncryptSevLib: Maximize Page State Change efficiency
Date: Fri, 08 Mar 2024 07:32:32 -0800
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BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3D4654
Similar to the Page State Change optimization added previously, also take
into account the possiblity of using the SVSM for PVALIDATE instructions.
Conditionally adjust the maximum number of entries based on how many
entries the SVSM calling area can support.
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Michael Roth <michael.roth@amd.com>
Cc: Min Xu <min.m.xu@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
OvmfPkg/Library/BaseMemEncryptSevLib/X64/SnpPageStateChangeInternal.c | 7 =
+++++++
1 file changed, 7 insertions(+)
diff --git a/OvmfPkg/Library/BaseMemEncryptSevLib/X64/SnpPageStateChangeInt=
ernal.c b/OvmfPkg/Library/BaseMemEncryptSevLib/X64/SnpPageStateChangeIntern=
al.c
index c8c0c4ef0e95..e073f3937c41 100644
--- a/OvmfPkg/Library/BaseMemEncryptSevLib/X64/SnpPageStateChangeInternal.c
+++ b/OvmfPkg/Library/BaseMemEncryptSevLib/X64/SnpPageStateChangeInternal.c
@@ -18,6 +18,7 @@
=20
#include <Register/Amd/Ghcb.h>
#include <Register/Amd/Msr.h>
+#include <Register/Amd/Svsm.h>
=20
#include "SnpPageStateChange.h"
=20
@@ -78,6 +79,7 @@ BuildPageStateBuffer (
UINTN Index;
UINTN IndexMax;
UINTN PscIndexMax;
+ UINTN SvsmIndexMax;
=20
// Clear the page state structure
SetMem (Info, InfoSize, 0);
@@ -96,6 +98,11 @@ BuildPageStateBuffer (
IndexMax =3D MIN (IndexMax, PscIndexMax);
}
=20
+ SvsmIndexMax =3D (IndexMax / SVSM_PVALIDATE_MAX_ENTRY) * SVSM_PVALIDATE_=
MAX_ENTRY;
+ if (SvsmIndexMax > 0) {
+ IndexMax =3D MIN (IndexMax, SvsmIndexMax);
+ }
+
//
// Populate the page state entry structure
//
--=20
2.43.2
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