From 5a18c92aab13aac7917bc87ceefa23da68698be4 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Thu, 10 May 2007 03:15:36 -0700 Subject: [PATCH] Revert "[PATCH] paravirt: Add startup infrastructure for paravirtualization" This reverts commit c9ccf30d77f04064fe5436027ab9d2230c7cdd94. Entering the kernel at startup_32 without passing our real mode data in %esi, and without guaranteeing that physical and virtual addresses are identity mapped makes head.S impossible to maintain. The only user of this infrastructure is lguest which is not merged so nothing we currently support will break by removing this over designed nightmare, and only the pending lguest patches will be affected. The pending Xen patches have a different entry point that they use. We are currently discussing what Xen and lguest need to do to boot the kernel in a more normal fashion so using startup_32 in this weird manner is clearly not their long term direction. So let's remove this code in head.S before it causes brain damage to people trying to maintain head.S Cc: Chris Wright Cc: Andi Kleen Cc: Jeremy Fitzhardinge Cc: Zachary Amsden CC: H. Peter Anvin Signed-off-by: Eric W. Biederman Signed-off-by: Rusty Russell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/i386/kernel/head.S | 38 ---------------------------------- arch/i386/kernel/paravirt.c | 1 - arch/i386/kernel/vmlinux.lds.S | 6 ------ include/asm-i386/paravirt.h | 5 ----- 4 files changed, 50 deletions(-) diff --git a/arch/i386/kernel/head.S b/arch/i386/kernel/head.S index 9b10af65fa..f74dfc419b 100644 --- a/arch/i386/kernel/head.S +++ b/arch/i386/kernel/head.S @@ -71,12 +71,6 @@ INIT_MAP_BEYOND_END = BOOTBITMAP_SIZE + (PAGE_TABLE_SIZE + ALLOCATOR_SLOP)*PAGE_ .section .text.head,"ax",@progbits ENTRY(startup_32) -#ifdef CONFIG_PARAVIRT - movl %cs, %eax - testl $0x3, %eax - jnz startup_paravirt -#endif - /* * Set segments to known values. */ @@ -501,38 +495,6 @@ ignore_int: iret .section .text -#ifdef CONFIG_PARAVIRT -startup_paravirt: - cld - movl $(init_thread_union+THREAD_SIZE),%esp - - /* We take pains to preserve all the regs. */ - pushl %edx - pushl %ecx - pushl %eax - - pushl $__start_paravirtprobe -1: - movl 0(%esp), %eax - cmpl $__stop_paravirtprobe, %eax - je unhandled_paravirt - pushl (%eax) - movl 8(%esp), %eax - call *(%esp) - popl %eax - - movl 4(%esp), %eax - movl 8(%esp), %ecx - movl 12(%esp), %edx - - addl $4, (%esp) - jmp 1b - -unhandled_paravirt: - /* Nothing wanted us: we're screwed. */ - ud2 -#endif - /* * Real beginning of normal "text" segment */ diff --git a/arch/i386/kernel/paravirt.c b/arch/i386/kernel/paravirt.c index 5c10f376bc..faab09abca 100644 --- a/arch/i386/kernel/paravirt.c +++ b/arch/i386/kernel/paravirt.c @@ -19,7 +19,6 @@ #include #include #include -#include #include #include diff --git a/arch/i386/kernel/vmlinux.lds.S b/arch/i386/kernel/vmlinux.lds.S index 23e8614ede..80bec66402 100644 --- a/arch/i386/kernel/vmlinux.lds.S +++ b/arch/i386/kernel/vmlinux.lds.S @@ -78,12 +78,6 @@ SECTIONS CONSTRUCTORS } :data - .paravirtprobe : AT(ADDR(.paravirtprobe) - LOAD_OFFSET) { - __start_paravirtprobe = .; - *(.paravirtprobe) - __stop_paravirtprobe = .; - } - . = ALIGN(4096); .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) { __nosave_begin = .; diff --git a/include/asm-i386/paravirt.h b/include/asm-i386/paravirt.h index bc5c12c135..d7a0512f88 100644 --- a/include/asm-i386/paravirt.h +++ b/include/asm-i386/paravirt.h @@ -222,11 +222,6 @@ struct paravirt_ops void (*iret)(void); }; -/* Mark a paravirt probe function. */ -#define paravirt_probe(fn) \ - static asmlinkage void (*__paravirtprobe_##fn)(void) __attribute_used__ \ - __attribute__((__section__(".paravirtprobe"))) = fn - extern struct paravirt_ops paravirt_ops; #define PARAVIRT_PATCH(x) \ -- 2.39.5