From 7c4cb60e5b97677424e95baee9c29df54b26e6ba Mon Sep 17 00:00:00 2001 From: Zachary Amsden Date: Fri, 6 Jan 2006 00:11:47 -0800 Subject: [PATCH] [PATCH] x86: GDT alignment fix Make GDT page aligned and page padded to support running inside of a hypervisor. This prevents false sharing of the GDT page with other hot data, which is not allowed in Xen, and causes performance problems in VMware. Rather than go back to the old method of statically allocating the GDT (which wastes unneded space for non-present CPUs), the GDT for APs is allocated dynamically. Signed-off-by: Zachary Amsden Cc: "Seth, Rohit" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/i386/kernel/apm.c | 2 ++ arch/i386/kernel/cpu/common.c | 3 --- arch/i386/kernel/head.S | 2 ++ arch/i386/kernel/i386_ksyms.c | 3 +-- arch/i386/kernel/smpboot.c | 6 ++++++ drivers/pnp/pnpbios/bioscalls.c | 22 +++++++++++++--------- include/asm-i386/desc.h | 8 +++++--- 7 files changed, 29 insertions(+), 17 deletions(-) diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c index 1e60acbed3..6c8e483ce9 100644 --- a/arch/i386/kernel/apm.c +++ b/arch/i386/kernel/apm.c @@ -2317,6 +2317,8 @@ static int __init apm_init(void) for (i = 0; i < NR_CPUS; i++) { struct desc_struct *gdt = get_cpu_gdt_table(i); + if (!gdt) + continue; set_base(gdt[APM_CS >> 3], __va((unsigned long)apm_info.bios.cseg << 4)); set_base(gdt[APM_CS_16 >> 3], diff --git a/arch/i386/kernel/cpu/common.c b/arch/i386/kernel/cpu/common.c index 31e344b26b..cbc3206968 100644 --- a/arch/i386/kernel/cpu/common.c +++ b/arch/i386/kernel/cpu/common.c @@ -18,9 +18,6 @@ #include "cpu.h" -DEFINE_PER_CPU(struct desc_struct, cpu_gdt_table[GDT_ENTRIES]); -EXPORT_PER_CPU_SYMBOL(cpu_gdt_table); - DEFINE_PER_CPU(unsigned char, cpu_16bit_stack[CPU_16BIT_STACK_SIZE]); EXPORT_PER_CPU_SYMBOL(cpu_16bit_stack); diff --git a/arch/i386/kernel/head.S b/arch/i386/kernel/head.S index e437fb3674..870f20bf33 100644 --- a/arch/i386/kernel/head.S +++ b/arch/i386/kernel/head.S @@ -525,3 +525,5 @@ ENTRY(cpu_gdt_table) .quad 0x0000000000000000 /* 0xf0 - unused */ .quad 0x0000000000000000 /* 0xf8 - GDT entry 31: double-fault TSS */ + /* Be sure this is zeroed to avoid false validations in Xen */ + .fill PAGE_SIZE_asm / 8 - GDT_ENTRIES,8,0 diff --git a/arch/i386/kernel/i386_ksyms.c b/arch/i386/kernel/i386_ksyms.c index 180f070d03..3999bec50c 100644 --- a/arch/i386/kernel/i386_ksyms.c +++ b/arch/i386/kernel/i386_ksyms.c @@ -3,8 +3,7 @@ #include #include -/* This is definitely a GPL-only symbol */ -EXPORT_SYMBOL_GPL(cpu_gdt_table); +EXPORT_SYMBOL_GPL(cpu_gdt_descr); EXPORT_SYMBOL(__down_failed); EXPORT_SYMBOL(__down_failed_interruptible); diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c index 9ed449af8e..b3c2e2c267 100644 --- a/arch/i386/kernel/smpboot.c +++ b/arch/i386/kernel/smpboot.c @@ -903,6 +903,12 @@ static int __devinit do_boot_cpu(int apicid, int cpu) unsigned long start_eip; unsigned short nmi_high = 0, nmi_low = 0; + if (!cpu_gdt_descr[cpu].address && + !(cpu_gdt_descr[cpu].address = get_zeroed_page(GFP_KERNEL))) { + printk("Failed to allocate GDT for CPU %d\n", cpu); + return 1; + } + ++cpucount; /* diff --git a/drivers/pnp/pnpbios/bioscalls.c b/drivers/pnp/pnpbios/bioscalls.c index 6b7583f497..7cb476ed7f 100644 --- a/drivers/pnp/pnpbios/bioscalls.c +++ b/drivers/pnp/pnpbios/bioscalls.c @@ -69,14 +69,16 @@ __asm__( #define Q_SET_SEL(cpu, selname, address, size) \ do { \ -set_base(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], __va((u32)(address))); \ -set_limit(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], size); \ +struct desc_struct *gdt = get_cpu_gdt_table((cpu)); \ +set_base(gdt[(selname) >> 3], __va((u32)(address))); \ +set_limit(gdt[(selname) >> 3], size); \ } while(0) #define Q2_SET_SEL(cpu, selname, address, size) \ do { \ -set_base(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], (u32)(address)); \ -set_limit(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], size); \ +struct desc_struct *gdt = get_cpu_gdt_table((cpu)); \ +set_base(gdt[(selname) >> 3], (u32)(address)); \ +set_limit(gdt[(selname) >> 3], size); \ } while(0) static struct desc_struct bad_bios_desc = { 0, 0x00409200 }; @@ -115,8 +117,8 @@ static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3, return PNP_FUNCTION_NOT_SUPPORTED; cpu = get_cpu(); - save_desc_40 = per_cpu(cpu_gdt_table,cpu)[0x40 / 8]; - per_cpu(cpu_gdt_table,cpu)[0x40 / 8] = bad_bios_desc; + save_desc_40 = get_cpu_gdt_table(cpu)[0x40 / 8]; + get_cpu_gdt_table(cpu)[0x40 / 8] = bad_bios_desc; /* On some boxes IRQ's during PnP BIOS calls are deadly. */ spin_lock_irqsave(&pnp_bios_lock, flags); @@ -158,7 +160,7 @@ static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3, ); spin_unlock_irqrestore(&pnp_bios_lock, flags); - per_cpu(cpu_gdt_table,cpu)[0x40 / 8] = save_desc_40; + get_cpu_gdt_table(cpu)[0x40 / 8] = save_desc_40; put_cpu(); /* If we get here and this is set then the PnP BIOS faulted on us. */ @@ -535,8 +537,10 @@ void pnpbios_calls_init(union pnp_bios_install_struct *header) set_base(bad_bios_desc, __va((unsigned long)0x40 << 4)); _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4)); - for(i=0; i < NR_CPUS; i++) - { + for (i = 0; i < NR_CPUS; i++) { + struct desc_struct *gdt = get_cpu_gdt_table(i); + if (!gdt) + continue; Q2_SET_SEL(i, PNP_CS32, &pnp_bios_callfunc, 64 * 1024); Q_SET_SEL(i, PNP_CS16, header->fields.pm16cseg, 64 * 1024); Q_SET_SEL(i, PNP_DS, header->fields.pm16dseg, 64 * 1024); diff --git a/include/asm-i386/desc.h b/include/asm-i386/desc.h index 29b851a18c..494e73bca0 100644 --- a/include/asm-i386/desc.h +++ b/include/asm-i386/desc.h @@ -15,9 +15,6 @@ #include extern struct desc_struct cpu_gdt_table[GDT_ENTRIES]; -DECLARE_PER_CPU(struct desc_struct, cpu_gdt_table[GDT_ENTRIES]); - -#define get_cpu_gdt_table(_cpu) (per_cpu(cpu_gdt_table,_cpu)) DECLARE_PER_CPU(unsigned char, cpu_16bit_stack[CPU_16BIT_STACK_SIZE]); @@ -29,6 +26,11 @@ struct Xgt_desc_struct { extern struct Xgt_desc_struct idt_descr, cpu_gdt_descr[NR_CPUS]; +static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu) +{ + return ((struct desc_struct *)cpu_gdt_descr[cpu].address); +} + #define load_TR_desc() __asm__ __volatile__("ltr %w0"::"q" (GDT_ENTRY_TSS*8)) #define load_LDT_desc() __asm__ __volatile__("lldt %w0"::"q" (GDT_ENTRY_LDT*8)) -- 2.39.5