52 lines
1.9 KiB
Diff
52 lines
1.9 KiB
Diff
From 543497088c1356c408f1bf79c06ab64b5c35be6b Mon Sep 17 00:00:00 2001
|
|
From: Gerd Hoffmann <kraxel@redhat.com>
|
|
Date: Wed, 17 May 2023 12:24:47 +0200
|
|
Subject: [PATCH 17/27] OvmfPkg/PlatformInitLib: check PcdUse1GPageTable
|
|
|
|
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/PlatformInitLib.inf | 1 +
|
|
OvmfPkg/Library/PlatformInitLib/MemDetect.c | 5 +++++
|
|
2 files changed, 6 insertions(+)
|
|
|
|
diff --git a/OvmfPkg/Library/PlatformInitLib/PlatformInitLib.inf b/OvmfPkg/Library/PlatformInitLib/PlatformInitLib.inf
|
|
index 86a82ad3e084..5a79d95b689c 100644
|
|
--- a/OvmfPkg/Library/PlatformInitLib/PlatformInitLib.inf
|
|
+++ b/OvmfPkg/Library/PlatformInitLib/PlatformInitLib.inf
|
|
@@ -58,6 +58,7 @@ [LibraryClasses.X64]
|
|
|
|
[Pcd]
|
|
gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress
|
|
+ gEfiMdeModulePkgTokenSpaceGuid.PcdUse1GPageTable
|
|
|
|
[FixedPcd]
|
|
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfWorkAreaBase
|
|
diff --git a/OvmfPkg/Library/PlatformInitLib/MemDetect.c b/OvmfPkg/Library/PlatformInitLib/MemDetect.c
|
|
index acf90b4e93fd..1102b00ecbf0 100644
|
|
--- a/OvmfPkg/Library/PlatformInitLib/MemDetect.c
|
|
+++ b/OvmfPkg/Library/PlatformInitLib/MemDetect.c
|
|
@@ -663,6 +663,11 @@ 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);
|
|
}
|
|
--
|
|
2.40.1
|
|
|