From 7a61d35d4b4056e7711031202da7605e052f4137 Mon Sep 17 00:00:00 2001
From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Wed, 2 May 2007 19:27:15 +0200
Subject: [PATCH] [PATCH] i386: Page-align the GDT
Xen wants a dedicated page for the GDT. I believe VMI likes it too.
lguest, KVM and native don't care.
Simple transformation to page-aligned "struct gdt_page".
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Jeremy Fitzhardinge <jeremy@xensource.com>
---
arch/i386/kernel/cpu/common.c | 6 +++---
arch/i386/kernel/entry.S | 2 +-
arch/i386/kernel/head.S | 2 +-
arch/i386/kernel/traps.c | 2 +-
include/asm-i386/desc.h | 9 +++++++--
5 files changed, 13 insertions(+), 8 deletions(-)
diff --git a/arch/i386/kernel/cpu/common.c b/arch/i386/kernel/cpu/common.c
index 58128585ae605..7a4c036d93c8c 100644
--- a/arch/i386/kernel/cpu/common.c
+++ b/arch/i386/kernel/cpu/common.c
@@ -22,7 +22,7 @@
#include "cpu.h"
-DEFINE_PER_CPU(struct desc_struct, cpu_gdt[GDT_ENTRIES]) = {
+DEFINE_PER_CPU(struct gdt_page, gdt_page) = { .gdt = {
[GDT_ENTRY_KERNEL_CS] = { 0x0000ffff, 0x00cf9a00 },
[GDT_ENTRY_KERNEL_DS] = { 0x0000ffff, 0x00cf9200 },
[GDT_ENTRY_DEFAULT_USER_CS] = { 0x0000ffff, 0x00cffa00 },
@@ -48,8 +48,8 @@ DEFINE_PER_CPU(struct desc_struct, cpu_gdt[GDT_ENTRIES]) = {
[GDT_ENTRY_ESPFIX_SS] = { 0x00000000, 0x00c09200 },
[GDT_ENTRY_PDA] = { 0x00000000, 0x00c09200 }, /* set in setup_pda */
-};
-EXPORT_PER_CPU_SYMBOL_GPL(cpu_gdt);
+} };
+EXPORT_PER_CPU_SYMBOL_GPL(gdt_page);
DEFINE_PER_CPU(struct i386_pda, _cpu_pda);
EXPORT_PER_CPU_SYMBOL(_cpu_pda);
diff --git a/arch/i386/kernel/entry.S b/arch/i386/kernel/entry.S
index e07473c0d3e73..3e4aa1fd33e27 100644
--- a/arch/i386/kernel/entry.S
+++ b/arch/i386/kernel/entry.S
@@ -557,7 +557,7 @@ END(syscall_badsys)
#define FIXUP_ESPFIX_STACK \
/* since we are on a wrong stack, we cant make it a C code :( */ \
movl %fs:PDA_cpu, %ebx; \
- PER_CPU(cpu_gdt, %ebx); \
+ PER_CPU(gdt_page, %ebx); \
GET_DESC_BASE(GDT_ENTRY_ESPFIX_SS, %ebx, %eax, %ax, %al, %ah); \
addl %esp, %eax; \
pushl $__KERNEL_DS; \
diff --git a/arch/i386/kernel/head.S b/arch/i386/kernel/head.S
index cc46494787e8c..bb36c24311b43 100644
--- a/arch/i386/kernel/head.S
+++ b/arch/i386/kernel/head.S
@@ -598,7 +598,7 @@ idt_descr:
.word 0 # 32 bit align gdt_desc.address
ENTRY(early_gdt_descr)
.word GDT_ENTRIES*8-1
- .long per_cpu__cpu_gdt /* Overwritten for secondary CPUs */
+ .long per_cpu__gdt_page /* Overwritten for secondary CPUs */
/*
* The boot_gdt must mirror the equivalent in setup.S and is
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index e0a23bee69674..f21b41e7770c6 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -1030,7 +1030,7 @@ fastcall void do_spurious_interrupt_bug(struct pt_regs * regs,
fastcall unsigned long patch_espfix_desc(unsigned long uesp,
unsigned long kesp)
{
- struct desc_struct *gdt = __get_cpu_var(cpu_gdt);
+ struct desc_struct *gdt = __get_cpu_var(gdt_page).gdt;
unsigned long base = (kesp - uesp) & -THREAD_SIZE;
unsigned long new_kesp = kesp - base;
unsigned long lim_pages = (new_kesp | (THREAD_SIZE - 1)) >> PAGE_SHIFT;
diff --git a/include/asm-i386/desc.h b/include/asm-i386/desc.h
index 4a974064e9283..c547403f341dc 100644
--- a/include/asm-i386/desc.h
+++ b/include/asm-i386/desc.h
@@ -18,10 +18,15 @@ struct Xgt_desc_struct {
unsigned short pad;
} __attribute__ ((packed));
-DECLARE_PER_CPU(struct desc_struct, cpu_gdt[GDT_ENTRIES]);
+struct gdt_page
+{
+ struct desc_struct gdt[GDT_ENTRIES];
+} __attribute__((aligned(PAGE_SIZE)));
+DECLARE_PER_CPU(struct gdt_page, gdt_page);
+
static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu)
{
- return per_cpu(cpu_gdt, cpu);
+ return per_cpu(gdt_page, cpu).gdt;
}
extern struct Xgt_desc_struct idt_descr;
--
2.30.2