linux-kernel - [PATCH RFC 5/5] Docs: document notemppt option

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Date:   Wed, 10 Nov 2021 13:46:13 +0300
From:   Baskov Evgeniy <baskov@...ras.ru>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     Baskov Evgeniy <baskov@...ras.ru>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        linux-doc@...r.kernel.org, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH RFC 5/5] Docs: document notemppt option

This option allows to disable building temporary page tables when
booting via efistub with CONFIG_EFI_STRICT_PGTABLE enabled.

Signed-off-by: Baskov Evgeniy <baskov@...ras.ru>
---
 Documentation/admin-guide/kernel-parameters.txt | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 43dc35fe5bc0..0c4ed43cd13c 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1294,7 +1294,8 @@
 	efi=		[EFI]
 			Format: { "debug", "disable_early_pci_dma",
 				  "nochunk", "noruntime", "nosoftreserve",
-				  "novamap", "no_disable_early_pci_dma" }
+				  "novamap", "no_disable_early_pci_dma",
+				  "notemppt" }
 			debug: enable misc debug output.
 			disable_early_pci_dma: disable the busmaster bit on all
 			PCI bridges while in the EFI boot stub.
@@ -1311,6 +1312,10 @@
 			novamap: do not call SetVirtualAddressMap().
 			no_disable_early_pci_dma: Leave the busmaster bit set
 			on all PCI bridges while in the EFI boot stub
+			notemppt: disable temporary page table creation in EFISTUB
+			for CONFIG_EFI_STRICT_PGTABLE on x86_64. Can very slightly
+			increase boot speed. Page copying is not required by most
+			EFI implementations.
 
 	efi_no_storage_paranoia [EFI; X86]
 			Using this parameter you can use more than 50% of
-- 
2.33.1