52 lines
1.9 KiB
Diff
52 lines
1.9 KiB
Diff
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From 543497088c1356c408f1bf79c06ab64b5c35be6b Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Wed, 17 May 2023 12:24:47 +0200
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Subject: [PATCH 17/27] OvmfPkg/PlatformInitLib: check PcdUse1GPageTable
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If PcdUse1GPageTable is not enabled restrict the physical address space
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used to 1TB, to limit the amount of memory needed for identity mapping
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page tables.
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The same already happens in case the processor has no support for
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gigabyte pages.
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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Acked-by: Ard Biesheuvel <ardb@kernel.org>
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(cherry picked from commit d4d24001f78bcee965d8854fba6f08f48b4ec446)
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---
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OvmfPkg/Library/PlatformInitLib/PlatformInitLib.inf | 1 +
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OvmfPkg/Library/PlatformInitLib/MemDetect.c | 5 +++++
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2 files changed, 6 insertions(+)
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diff --git a/OvmfPkg/Library/PlatformInitLib/PlatformInitLib.inf b/OvmfPkg/Library/PlatformInitLib/PlatformInitLib.inf
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index 86a82ad3e084..5a79d95b689c 100644
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--- a/OvmfPkg/Library/PlatformInitLib/PlatformInitLib.inf
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+++ b/OvmfPkg/Library/PlatformInitLib/PlatformInitLib.inf
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@@ -58,6 +58,7 @@ [LibraryClasses.X64]
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[Pcd]
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gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress
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+ gEfiMdeModulePkgTokenSpaceGuid.PcdUse1GPageTable
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[FixedPcd]
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfWorkAreaBase
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diff --git a/OvmfPkg/Library/PlatformInitLib/MemDetect.c b/OvmfPkg/Library/PlatformInitLib/MemDetect.c
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index acf90b4e93fd..1102b00ecbf0 100644
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--- a/OvmfPkg/Library/PlatformInitLib/MemDetect.c
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+++ b/OvmfPkg/Library/PlatformInitLib/MemDetect.c
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@@ -663,6 +663,11 @@ PlatformAddressWidthFromCpuid (
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PhysBits = 40;
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}
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+ if (!FixedPcdGetBool (PcdUse1GPageTable) && (PhysBits > 40)) {
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+ DEBUG ((DEBUG_INFO, "%a: limit PhysBits to 40 (PcdUse1GPageTable is false)\n", __func__));
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+ PhysBits = 40;
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+ }
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+
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PlatformInfoHob->PhysMemAddressWidth = PhysBits;
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PlatformInfoHob->FirstNonAddress = LShiftU64 (1, PlatformInfoHob->PhysMemAddressWidth);
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}
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--
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2.40.1
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