Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753510Ab0HTUOq (ORCPT ); Fri, 20 Aug 2010 16:14:46 -0400 Received: from hera.kernel.org ([140.211.167.34]:52253 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752169Ab0HTUOo (ORCPT ); Fri, 20 Aug 2010 16:14:44 -0400 Date: Fri, 20 Aug 2010 20:13:46 GMT Message-Id: <201008202013.o7KKDkNA026173@hera.kernel.org> From: "H. Peter Anvin" To: Linus Torvalds Subject: [GIT PULL] x86 fixes for 2.6.36-rc2 Cc: , Borislav Petkov , Daniel Kiper , "H. Peter Anvin" , "H. Peter Anvin" , Hans Rosenfeld , Ingo Molnar , Joerg Roedel , Linux Kernel Mailing List , Thomas Gleixner , jeremy@goop.org, konrad.wilk@oracle.com, xen-devel@lists.xensource.com, "Rafael J. Wysocki" X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.3 (hera.kernel.org [127.0.0.1]); Fri, 20 Aug 2010 20:13:46 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9049 Lines: 296 Hi Linus, The following changes since commit 763008c4357b73c8d18396dfd8d79dc58fa3f99d: Merge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6 (2010-08-18 15:45:23 -0700) are available in the git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git x86-fixes-for-linus Borislav Petkov (1): x86, hotplug: Serialize CPU hotplug to avoid bringup concurrency issues Daniel Kiper (1): x86, apic: Fix apic=debug boot crash H. Peter Anvin (1): x86-32: Fix dummy trampoline-related inline stubs Hans Rosenfeld (1): x86, cpu: Fix regression in AMD errata checking code Joerg Roedel (1): x86-32: Separate 1:1 pagetables from swapper_pg_dir arch/x86/Kconfig | 5 +++ arch/x86/include/asm/pgtable_32.h | 1 + arch/x86/include/asm/trampoline.h | 5 +++- arch/x86/kernel/apic/io_apic.c | 2 + arch/x86/kernel/cpu/amd.c | 2 +- arch/x86/kernel/head_32.S | 8 +++++- arch/x86/kernel/setup.c | 2 + arch/x86/kernel/smpboot.c | 51 +++++++++++++++++++++++------------- arch/x86/kernel/trampoline.c | 18 +++++++++++++ 9 files changed, 72 insertions(+), 22 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index a84fc34..ac7827f 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -245,6 +245,11 @@ config ARCH_HWEIGHT_CFLAGS config KTIME_SCALAR def_bool X86_32 + +config ARCH_CPU_PROBE_RELEASE + def_bool y + depends on HOTPLUG_CPU + source "init/Kconfig" source "kernel/Kconfig.freezer" diff --git a/arch/x86/include/asm/pgtable_32.h b/arch/x86/include/asm/pgtable_32.h index 2984a25..f686f49 100644 --- a/arch/x86/include/asm/pgtable_32.h +++ b/arch/x86/include/asm/pgtable_32.h @@ -26,6 +26,7 @@ struct mm_struct; struct vm_area_struct; extern pgd_t swapper_pg_dir[1024]; +extern pgd_t trampoline_pg_dir[1024]; static inline void pgtable_cache_init(void) { } static inline void check_pgt_cache(void) { } diff --git a/arch/x86/include/asm/trampoline.h b/arch/x86/include/asm/trampoline.h index cb507bb..4dde797 100644 --- a/arch/x86/include/asm/trampoline.h +++ b/arch/x86/include/asm/trampoline.h @@ -13,14 +13,17 @@ extern unsigned char *trampoline_base; extern unsigned long init_rsp; extern unsigned long initial_code; +extern unsigned long initial_page_table; extern unsigned long initial_gs; #define TRAMPOLINE_SIZE roundup(trampoline_end - trampoline_data, PAGE_SIZE) extern unsigned long setup_trampoline(void); +extern void __init setup_trampoline_page_table(void); extern void __init reserve_trampoline_memory(void); #else -static inline void reserve_trampoline_memory(void) {}; +static inline void setup_trampoline_page_table(void) {} +static inline void reserve_trampoline_memory(void) {} #endif /* CONFIG_X86_TRAMPOLINE */ #endif /* __ASSEMBLY__ */ diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index 4dc0084..f1efeba 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -1728,6 +1728,8 @@ __apicdebuginit(void) print_IO_APIC(void) struct irq_pin_list *entry; cfg = desc->chip_data; + if (!cfg) + continue; entry = cfg->irq_2_pin; if (!entry) continue; diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index 60a57b1..ba5f62f 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -669,7 +669,7 @@ bool cpu_has_amd_erratum(const int *erratum) } /* OSVW unavailable or ID unknown, match family-model-stepping range */ - ms = (cpu->x86_model << 8) | cpu->x86_mask; + ms = (cpu->x86_model << 4) | cpu->x86_mask; while ((range = *erratum++)) if ((cpu->x86 == AMD_MODEL_RANGE_FAMILY(range)) && (ms >= AMD_MODEL_RANGE_START(range)) && diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S index ff4c453..fa8c1b8 100644 --- a/arch/x86/kernel/head_32.S +++ b/arch/x86/kernel/head_32.S @@ -334,7 +334,7 @@ ENTRY(startup_32_smp) /* * Enable paging */ - movl $pa(swapper_pg_dir),%eax + movl pa(initial_page_table), %eax movl %eax,%cr3 /* set the page table pointer.. */ movl %cr0,%eax orl $X86_CR0_PG,%eax @@ -614,6 +614,8 @@ ignore_int: .align 4 ENTRY(initial_code) .long i386_start_kernel +ENTRY(initial_page_table) + .long pa(swapper_pg_dir) /* * BSS section @@ -629,6 +631,10 @@ ENTRY(swapper_pg_dir) #endif swapper_pg_fixmap: .fill 1024,4,0 +#ifdef CONFIG_X86_TRAMPOLINE +ENTRY(trampoline_pg_dir) + .fill 1024,4,0 +#endif ENTRY(empty_zero_page) .fill 4096,1,0 diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index b008e78..c3a4fbb 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -1014,6 +1014,8 @@ void __init setup_arch(char **cmdline_p) paging_init(); x86_init.paging.pagetable_setup_done(swapper_pg_dir); + setup_trampoline_page_table(); + tboot_probe(); #ifdef CONFIG_X86_64 diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index a5e928b..8b3bfc4 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -73,7 +73,6 @@ #ifdef CONFIG_X86_32 u8 apicid_2_node[MAX_APICID]; -static int low_mappings; #endif /* State of each CPU */ @@ -91,6 +90,25 @@ DEFINE_PER_CPU(int, cpu_state) = { 0 }; static DEFINE_PER_CPU(struct task_struct *, idle_thread_array); #define get_idle_for_cpu(x) (per_cpu(idle_thread_array, x)) #define set_idle_for_cpu(x, p) (per_cpu(idle_thread_array, x) = (p)) + +/* + * We need this for trampoline_base protection from concurrent accesses when + * off- and onlining cores wildly. + */ +static DEFINE_MUTEX(x86_cpu_hotplug_driver_mutex); + +void cpu_hotplug_driver_lock() +{ + mutex_lock(&x86_cpu_hotplug_driver_mutex); +} + +void cpu_hotplug_driver_unlock() +{ + mutex_unlock(&x86_cpu_hotplug_driver_mutex); +} + +ssize_t arch_cpu_probe(const char *buf, size_t count) { return -1; } +ssize_t arch_cpu_release(const char *buf, size_t count) { return -1; } #else static struct task_struct *idle_thread_array[NR_CPUS] __cpuinitdata ; #define get_idle_for_cpu(x) (idle_thread_array[(x)]) @@ -281,6 +299,18 @@ notrace static void __cpuinit start_secondary(void *unused) * fragile that we want to limit the things done here to the * most necessary things. */ + +#ifdef CONFIG_X86_32 + /* + * Switch away from the trampoline page-table + * + * Do this before cpu_init() because it needs to access per-cpu + * data which may not be mapped in the trampoline page-table. + */ + load_cr3(swapper_pg_dir); + __flush_tlb_all(); +#endif + vmi_bringup(); cpu_init(); preempt_disable(); @@ -299,12 +329,6 @@ notrace static void __cpuinit start_secondary(void *unused) legacy_pic->chip->unmask(0); } -#ifdef CONFIG_X86_32 - while (low_mappings) - cpu_relax(); - __flush_tlb_all(); -#endif - /* This must be done before setting cpu_online_mask */ set_cpu_sibling_map(raw_smp_processor_id()); wmb(); @@ -750,6 +774,7 @@ do_rest: #ifdef CONFIG_X86_32 /* Stack for startup_32 can be just as for start_secondary onwards */ irq_ctx_init(cpu); + initial_page_table = __pa(&trampoline_pg_dir); #else clear_tsk_thread_flag(c_idle.idle, TIF_FORK); initial_gs = per_cpu_offset(cpu); @@ -897,20 +922,8 @@ int __cpuinit native_cpu_up(unsigned int cpu) per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; -#ifdef CONFIG_X86_32 - /* init low mem mapping */ - clone_pgd_range(swapper_pg_dir, swapper_pg_dir + KERNEL_PGD_BOUNDARY, - min_t(unsigned long, KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY)); - flush_tlb_all(); - low_mappings = 1; - err = do_boot_cpu(apicid, cpu); - zap_low_mappings(false); - low_mappings = 0; -#else - err = do_boot_cpu(apicid, cpu); -#endif if (err) { pr_debug("do_boot_cpu failed %d\n", err); return -EIO; diff --git a/arch/x86/kernel/trampoline.c b/arch/x86/kernel/trampoline.c index c652ef6..a874495 100644 --- a/arch/x86/kernel/trampoline.c +++ b/arch/x86/kernel/trampoline.c @@ -1,6 +1,7 @@ #include #include +#include #include #if defined(CONFIG_X86_64) && defined(CONFIG_ACPI_SLEEP) @@ -37,3 +38,20 @@ unsigned long __trampinit setup_trampoline(void) memcpy(trampoline_base, trampoline_data, TRAMPOLINE_SIZE); return virt_to_phys(trampoline_base); } + +void __init setup_trampoline_page_table(void) +{ +#ifdef CONFIG_X86_32 + /* Copy kernel address range */ + clone_pgd_range(trampoline_pg_dir + KERNEL_PGD_BOUNDARY, + swapper_pg_dir + KERNEL_PGD_BOUNDARY, + min_t(unsigned long, KERNEL_PGD_PTRS, + KERNEL_PGD_BOUNDARY)); + + /* Initialize low mappings */ + clone_pgd_range(trampoline_pg_dir, + swapper_pg_dir + KERNEL_PGD_BOUNDARY, + min_t(unsigned long, KERNEL_PGD_PTRS, + KERNEL_PGD_BOUNDARY)); +#endif +} -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/