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edk2/SOURCES/edk2-OvmfPkg-PlatformInitLi...

58 lines
2.1 KiB

From f24768ae482651073db9050fdaad49afe930b127 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Wed, 17 May 2023 12:24:47 +0200
Subject: [PATCH 10/12] OvmfPkg/PlatformInitLib: check PcdUse1GPageTable
RH-Author: Gerd Hoffmann <kraxel@redhat.com>
RH-MergeRequest: 40: enable use of gigabyte pages
RH-Jira: RHEL-644
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
RH-Commit: [1/3] 5d8b87d3b6a6b8af4d1a4aabedd8f69c512bf01c (kraxel/centos-edk2)
If PcdUse1GPageTable is not enabled restrict the physical address space
used to 1TB, to limit the amount of memory needed for identity mapping
page tables.
The same already happens in case the processor has no support for
gigabyte pages.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
(cherry picked from commit d4d24001f78bcee965d8854fba6f08f48b4ec446)
---
OvmfPkg/Library/PlatformInitLib/MemDetect.c | 5 +++++
OvmfPkg/Library/PlatformInitLib/PlatformInitLib.inf | 1 +
2 files changed, 6 insertions(+)
diff --git a/OvmfPkg/Library/PlatformInitLib/MemDetect.c b/OvmfPkg/Library/PlatformInitLib/MemDetect.c
index 0482d8906d..662e7e85bb 100644
--- a/OvmfPkg/Library/PlatformInitLib/MemDetect.c
+++ b/OvmfPkg/Library/PlatformInitLib/MemDetect.c
@@ -666,6 +666,11 @@ PlatformAddressWidthFromCpuid (
PhysBits = 40;
}
+ if (!FixedPcdGetBool (PcdUse1GPageTable) && (PhysBits > 40)) {
+ DEBUG ((DEBUG_INFO, "%a: limit PhysBits to 40 (PcdUse1GPageTable is false)\n", __func__));
+ PhysBits = 40;
+ }
+
PlatformInfoHob->PhysMemAddressWidth = PhysBits;
PlatformInfoHob->FirstNonAddress = LShiftU64 (1, PlatformInfoHob->PhysMemAddressWidth);
}
diff --git a/OvmfPkg/Library/PlatformInitLib/PlatformInitLib.inf b/OvmfPkg/Library/PlatformInitLib/PlatformInitLib.inf
index 86a82ad3e0..5a79d95b68 100644
--- a/OvmfPkg/Library/PlatformInitLib/PlatformInitLib.inf
+++ b/OvmfPkg/Library/PlatformInitLib/PlatformInitLib.inf
@@ -58,6 +58,7 @@
[Pcd]
gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress
+ gEfiMdeModulePkgTokenSpaceGuid.PcdUse1GPageTable
[FixedPcd]
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfWorkAreaBase
--
2.39.3