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From: Arvind Sankar <nivedita@alum.mit.edu>
To: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Ard Biesheuvel <ardb@kernel.org>
Cc: linux-efi@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 1/7] x86/boot: Remove KEEP_SEGMENTS support
Date: Sun,  2 Feb 2020 12:13:47 -0500
Message-ID: <20200202171353.3736319-2-nivedita@alum.mit.edu> (raw)
In-Reply-To: <20200202171353.3736319-1-nivedita@alum.mit.edu>

Commit a24e785111a3 ("i386: paravirt boot sequence") added this flag for
use by paravirtualized environments such as Xen. However, Xen never made
use of this flag [1], and it was only ever used by lguest [2].

Commit ecda85e70277 ("x86/lguest: Remove lguest support") removed
lguest, so KEEP_SEGMENTS has lost its last user.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
[1] https://lore.kernel.org/lkml/4D4B097C.5050405@goop.org
[2] https://www.mail-archive.com/lguest@lists.ozlabs.org/msg00469.html
---
 Documentation/x86/boot.rst         | 8 ++------
 arch/x86/boot/compressed/head_32.S | 8 --------
 arch/x86/boot/compressed/head_64.S | 8 --------
 arch/x86/kernel/head_32.S          | 6 ------
 4 files changed, 2 insertions(+), 28 deletions(-)

diff --git a/Documentation/x86/boot.rst b/Documentation/x86/boot.rst
index c9c201596c3e..fa7ddc0428c8 100644
--- a/Documentation/x86/boot.rst
+++ b/Documentation/x86/boot.rst
@@ -490,15 +490,11 @@ Protocol:	2.00+
 		kernel) to not write early messages that require
 		accessing the display hardware directly.
 
-  Bit 6 (write): KEEP_SEGMENTS
+  Bit 6 (obsolete): KEEP_SEGMENTS
 
 	Protocol: 2.07+
 
-	- If 0, reload the segment registers in the 32bit entry point.
-	- If 1, do not reload the segment registers in the 32bit entry point.
-
-		Assume that %cs %ds %ss %es are all set to flat segments with
-		a base of 0 (or the equivalent for their environment).
+        - This flag is obsolete.
 
   Bit 7 (write): CAN_USE_HEAP
 
diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S
index 73f17d0544dd..cb2cb91fce45 100644
--- a/arch/x86/boot/compressed/head_32.S
+++ b/arch/x86/boot/compressed/head_32.S
@@ -63,13 +63,6 @@
 	__HEAD
 SYM_FUNC_START(startup_32)
 	cld
-	/*
-	 * Test KEEP_SEGMENTS flag to see if the bootloader is asking
-	 * us to not reload segments
-	 */
-	testb	$KEEP_SEGMENTS, BP_loadflags(%esi)
-	jnz	1f
-
 	cli
 	movl	$__BOOT_DS, %eax
 	movl	%eax, %ds
@@ -77,7 +70,6 @@ SYM_FUNC_START(startup_32)
 	movl	%eax, %fs
 	movl	%eax, %gs
 	movl	%eax, %ss
-1:
 
 /*
  * Calculate the delta between where we were compiled to run
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index 1f1f6c8139b3..bd44d89540d3 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -53,19 +53,11 @@ SYM_FUNC_START(startup_32)
 	 * all need to be under the 4G limit.
 	 */
 	cld
-	/*
-	 * Test KEEP_SEGMENTS flag to see if the bootloader is asking
-	 * us to not reload segments
-	 */
-	testb $KEEP_SEGMENTS, BP_loadflags(%esi)
-	jnz 1f
-
 	cli
 	movl	$(__BOOT_DS), %eax
 	movl	%eax, %ds
 	movl	%eax, %es
 	movl	%eax, %ss
-1:
 
 /*
  * Calculate the delta between where we were compiled to run
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index 3923ab4630d7..f66a6b90f954 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -67,11 +67,6 @@ __HEAD
 SYM_CODE_START(startup_32)
 	movl pa(initial_stack),%ecx
 	
-	/* test KEEP_SEGMENTS flag to see if the bootloader is asking
-		us to not reload segments */
-	testb $KEEP_SEGMENTS, BP_loadflags(%esi)
-	jnz 2f
-
 /*
  * Set segments to known values.
  */
@@ -82,7 +77,6 @@ SYM_CODE_START(startup_32)
 	movl %eax,%fs
 	movl %eax,%gs
 	movl %eax,%ss
-2:
 	leal -__PAGE_OFFSET(%ecx),%esp
 
 /*
-- 
2.24.1


  reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-30 20:04 [PATCH 0/8] Remove 64-bit GDT setup in efi_main + doc fixes Arvind Sankar
2020-01-30 20:04 ` [PATCH 1/8] efi/x86: Use C wrapper instead of inline assembly Arvind Sankar
2020-01-30 20:04 ` [PATCH 2/8] efi/x86: Allocate the GDT pointer on the stack Arvind Sankar
2020-01-30 20:04 ` [PATCH 3/8] efi/x86: Factor GDT setup code into a function Arvind Sankar
2020-01-30 20:04 ` [PATCH 4/8] efi/x86: Only setup the GDT for 32-bit kernel Arvind Sankar
2020-01-30 20:04 ` [PATCH 5/8] efi/x86: Allocate only the required 32 bytes for the GDT Arvind Sankar
2020-01-30 20:04 ` [PATCH 6/8] efi/x86: Change __KERNEL_{CS,DS} to __BOOT_{CS,DS} Arvind Sankar
2020-01-30 20:04 ` [PATCH 7/8] Documentation/x86/boot: Clarify segment requirements for EFI handover Arvind Sankar
2020-01-31 19:24   ` Arvind Sankar
2020-01-30 20:04 ` [PATCH 8/8] Documentation/x86/boot: Correct segment requirements for 64-bit boot Arvind Sankar
2020-01-31  8:42 ` [PATCH 0/8] Remove 64-bit GDT setup in efi_main + doc fixes Ard Biesheuvel
2020-01-31  9:31   ` Ard Biesheuvel
2020-01-31 19:10     ` Arvind Sankar
2020-02-02 17:13 ` [PATCH v2 0/7] x86/efi,boot: GDT handling cleanup/fixes Arvind Sankar
2020-02-02 17:13   ` Arvind Sankar [this message]
2020-02-02 17:13   ` [PATCH v2 2/7] efi/x86: Don't depend on firmware GDT layout Arvind Sankar
2020-02-02 17:54     ` Ard Biesheuvel
2020-02-02 18:18       ` Arvind Sankar
2020-02-02 17:13   ` [PATCH v2 3/7] x86/boot: Reload GDTR after copying to the end of the buffer Arvind Sankar
2020-02-02 17:13   ` [PATCH v2 4/7] x86/boot: Clear direction and interrupt flags in startup_64 Arvind Sankar
2020-02-02 17:13   ` [PATCH v2 5/7] efi/x86: Remove GDT setup from efi_main Arvind Sankar
2020-02-02 17:13   ` [PATCH v2 6/7] x86/boot: GDT limit value should be size - 1 Arvind Sankar
2020-02-02 17:13   ` [PATCH v2 7/7] x86/boot: Micro-optimize GDT loading instructions Arvind Sankar
2020-02-02 18:01   ` [PATCH v2 0/7] x86/efi,boot: GDT handling cleanup/fixes Ard Biesheuvel

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