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OvmfPkg/BaseMemEncryptSevLib: Maximize Page State Change efficiency 

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4654

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>
This commit is contained in:
Tom Lendacky 2024-03-08 07:32:32 -08:00 committed by mergify[bot]
parent b505f11f39
commit 18fdffe825
1 changed files with 7 additions and 0 deletions
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7
OvmfPkg/Library/BaseMemEncryptSevLib/X64/SnpPageStateChangeInternal.c
View File

@ -18,6 +18,7 @@
#include <Register/Amd/Ghcb.h>
#include <Register/Amd/Msr.h>
#include <Register/Amd/Svsm.h>
#include "SnpPageStateChange.h"
@ -78,6 +79,7 @@ BuildPageStateBuffer (
UINTN Index;
UINTN IndexMax;
UINTN PscIndexMax;
UINTN SvsmIndexMax;
// Clear the page state structure
SetMem (Info, InfoSize, 0);
@ -96,6 +98,11 @@ BuildPageStateBuffer (
IndexMax = MIN (IndexMax, PscIndexMax);
}
SvsmIndexMax = (IndexMax / SVSM_PVALIDATE_MAX_ENTRY) * SVSM_PVALIDATE_MAX_ENTRY;
if (SvsmIndexMax > 0) {
IndexMax = MIN (IndexMax, SvsmIndexMax);
}
//
// Populate the page state entry structure
//