diff options
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/alternative.c | 25 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 72 | ||||
| -rw-r--r-- | arch/x86/kernel/kdebugfs.c | 60 | ||||
| -rw-r--r-- | arch/x86/kernel/kvm.c | 21 | ||||
| -rw-r--r-- | arch/x86/kernel/signal.c | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 14 | ||||
| -rw-r--r-- | arch/x86/kernel/stacktrace.c | 8 | ||||
| -rw-r--r-- | arch/x86/kernel/vmlinux.lds.S | 6 |
8 files changed, 116 insertions, 92 deletions
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index 99ef8b6f9a1a..ccd32013c47a 100644 --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -625,10 +625,23 @@ extern struct paravirt_patch_site __start_parainstructions[], * * See entry_{32,64}.S for more details. */ -static void __init int3_magic(unsigned int *ptr) -{ - *ptr = 1; -} + +/* + * We define the int3_magic() function in assembly to control the calling + * convention such that we can 'call' it from assembly. + */ + +extern void int3_magic(unsigned int *ptr); /* defined in asm */ + +asm ( +" .pushsection .init.text, \"ax\", @progbits\n" +" .type int3_magic, @function\n" +"int3_magic:\n" +" movl $1, (%" _ASM_ARG1 ")\n" +" ret\n" +" .size int3_magic, .-int3_magic\n" +" .popsection\n" +); extern __initdata unsigned long int3_selftest_ip; /* defined in asm below */ @@ -676,7 +689,9 @@ static void __init int3_selftest(void) "int3_selftest_ip:\n\t" __ASM_SEL(.long, .quad) " 1b\n\t" ".popsection\n\t" - : : __ASM_SEL_RAW(a, D) (&val) : "memory"); + : ASM_CALL_CONSTRAINT + : __ASM_SEL_RAW(a, D) (&val) + : "memory"); BUG_ON(val != 1); diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 309b6b9b49d4..11472178e17f 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -366,10 +366,62 @@ out: cr4_clear_bits(X86_CR4_UMIP); } -DEFINE_STATIC_KEY_FALSE_RO(cr_pinning); -EXPORT_SYMBOL(cr_pinning); -unsigned long cr4_pinned_bits __ro_after_init; -EXPORT_SYMBOL(cr4_pinned_bits); +static DEFINE_STATIC_KEY_FALSE_RO(cr_pinning); +static unsigned long cr4_pinned_bits __ro_after_init; + +void native_write_cr0(unsigned long val) +{ + unsigned long bits_missing = 0; + +set_register: + asm volatile("mov %0,%%cr0": "+r" (val), "+m" (__force_order)); + + if (static_branch_likely(&cr_pinning)) { + if (unlikely((val & X86_CR0_WP) != X86_CR0_WP)) { + bits_missing = X86_CR0_WP; + val |= bits_missing; + goto set_register; + } + /* Warn after we've set the missing bits. */ + WARN_ONCE(bits_missing, "CR0 WP bit went missing!?\n"); + } +} +EXPORT_SYMBOL(native_write_cr0); + +void native_write_cr4(unsigned long val) +{ + unsigned long bits_missing = 0; + +set_register: + asm volatile("mov %0,%%cr4": "+r" (val), "+m" (cr4_pinned_bits)); + + if (static_branch_likely(&cr_pinning)) { + if (unlikely((val & cr4_pinned_bits) != cr4_pinned_bits)) { + bits_missing = ~val & cr4_pinned_bits; + val |= bits_missing; + goto set_register; + } + /* Warn after we've set the missing bits. */ + WARN_ONCE(bits_missing, "CR4 bits went missing: %lx!?\n", + bits_missing); + } +} +EXPORT_SYMBOL(native_write_cr4); + +void cr4_init(void) +{ + unsigned long cr4 = __read_cr4(); + + if (boot_cpu_has(X86_FEATURE_PCID)) + cr4 |= X86_CR4_PCIDE; + if (static_branch_likely(&cr_pinning)) + cr4 |= cr4_pinned_bits; + + __write_cr4(cr4); + + /* Initialize cr4 shadow for this CPU. */ + this_cpu_write(cpu_tlbstate.cr4, cr4); +} /* * Once CPU feature detection is finished (and boot params have been @@ -1723,12 +1775,6 @@ void cpu_init(void) wait_for_master_cpu(cpu); - /* - * Initialize the CR4 shadow before doing anything that could - * try to read it. - */ - cr4_init_shadow(); - if (cpu) load_ucode_ap(); @@ -1823,12 +1869,6 @@ void cpu_init(void) wait_for_master_cpu(cpu); - /* - * Initialize the CR4 shadow before doing anything that could - * try to read it. - */ - cr4_init_shadow(); - show_ucode_info_early(); pr_info("Initializing CPU#%d\n", cpu); diff --git a/arch/x86/kernel/kdebugfs.c b/arch/x86/kernel/kdebugfs.c index 7670ac2bda3a..edaa30b20841 100644 --- a/arch/x86/kernel/kdebugfs.c +++ b/arch/x86/kernel/kdebugfs.c @@ -67,33 +67,18 @@ static const struct file_operations fops_setup_data = { .llseek = default_llseek, }; -static int __init +static void __init create_setup_data_node(struct dentry *parent, int no, struct setup_data_node *node) { - struct dentry *d, *type, *data; + struct dentry *d; char buf[16]; sprintf(buf, "%d", no); d = debugfs_create_dir(buf, parent); - if (!d) - return -ENOMEM; - - type = debugfs_create_x32("type", S_IRUGO, d, &node->type); - if (!type) - goto err_dir; - - data = debugfs_create_file("data", S_IRUGO, d, node, &fops_setup_data); - if (!data) - goto err_type; - return 0; - -err_type: - debugfs_remove(type); -err_dir: - debugfs_remove(d); - return -ENOMEM; + debugfs_create_x32("type", S_IRUGO, d, &node->type); + debugfs_create_file("data", S_IRUGO, d, node, &fops_setup_data); } static int __init create_setup_data_nodes(struct dentry *parent) @@ -106,8 +91,6 @@ static int __init create_setup_data_nodes(struct dentry *parent) int no = 0; d = debugfs_create_dir("setup_data", parent); - if (!d) - return -ENOMEM; pa_data = boot_params.hdr.setup_data; @@ -128,19 +111,17 @@ static int __init create_setup_data_nodes(struct dentry *parent) node->paddr = pa_data; node->type = data->type; node->len = data->len; - error = create_setup_data_node(d, no, node); + create_setup_data_node(d, no, node); pa_data = data->next; memunmap(data); - if (error) - goto err_dir; no++; } return 0; err_dir: - debugfs_remove(d); + debugfs_remove_recursive(d); return error; } @@ -151,35 +132,18 @@ static struct debugfs_blob_wrapper boot_params_blob = { static int __init boot_params_kdebugfs_init(void) { - struct dentry *dbp, *version, *data; - int error = -ENOMEM; + struct dentry *dbp; + int error; dbp = debugfs_create_dir("boot_params", arch_debugfs_dir); - if (!dbp) - return -ENOMEM; - - version = debugfs_create_x16("version", S_IRUGO, dbp, - &boot_params.hdr.version); - if (!version) - goto err_dir; - data = debugfs_create_blob("data", S_IRUGO, dbp, - &boot_params_blob); - if (!data) - goto err_version; + debugfs_create_x16("version", S_IRUGO, dbp, &boot_params.hdr.version); + debugfs_create_blob("data", S_IRUGO, dbp, &boot_params_blob); error = create_setup_data_nodes(dbp); if (error) - goto err_data; + debugfs_remove_recursive(dbp); - return 0; - -err_data: - debugfs_remove(data); -err_version: - debugfs_remove(version); -err_dir: - debugfs_remove(dbp); return error; } #endif /* CONFIG_DEBUG_BOOT_PARAMS */ @@ -189,8 +153,6 @@ static int __init arch_kdebugfs_init(void) int error = 0; arch_debugfs_dir = debugfs_create_dir("x86", NULL); - if (!arch_debugfs_dir) - return -ENOMEM; #ifdef CONFIG_DEBUG_BOOT_PARAMS error = boot_params_kdebugfs_init(); diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 5169b8cc35bb..82caf01b63dd 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -527,6 +527,21 @@ static void kvm_setup_pv_ipi(void) pr_info("KVM setup pv IPIs\n"); } +static void kvm_smp_send_call_func_ipi(const struct cpumask *mask) +{ + int cpu; + + native_send_call_func_ipi(mask); + + /* Make sure other vCPUs get a chance to run if they need to. */ + for_each_cpu(cpu, mask) { + if (vcpu_is_preempted(cpu)) { + kvm_hypercall1(KVM_HC_SCHED_YIELD, per_cpu(x86_cpu_to_apicid, cpu)); + break; + } + } +} + static void __init kvm_smp_prepare_cpus(unsigned int max_cpus) { native_smp_prepare_cpus(max_cpus); @@ -638,6 +653,12 @@ static void __init kvm_guest_init(void) #ifdef CONFIG_SMP smp_ops.smp_prepare_cpus = kvm_smp_prepare_cpus; smp_ops.smp_prepare_boot_cpu = kvm_smp_prepare_boot_cpu; + if (kvm_para_has_feature(KVM_FEATURE_PV_SCHED_YIELD) && + !kvm_para_has_hint(KVM_HINTS_REALTIME) && + kvm_para_has_feature(KVM_FEATURE_STEAL_TIME)) { + smp_ops.send_call_func_ipi = kvm_smp_send_call_func_ipi; + pr_info("KVM setup pv sched yield\n"); + } if (cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "x86/kvm:online", kvm_cpu_online, kvm_cpu_down_prepare) < 0) pr_err("kvm_guest: Failed to install cpu hotplug callbacks\n"); diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c index 7cf508f78c8c..8eb7193e158d 100644 --- a/arch/x86/kernel/signal.c +++ b/arch/x86/kernel/signal.c @@ -391,7 +391,7 @@ static int __setup_rt_frame(int sig, struct ksignal *ksig, put_user_ex(&frame->uc, &frame->puc); /* Create the ucontext. */ - if (boot_cpu_has(X86_FEATURE_XSAVE)) + if (static_cpu_has(X86_FEATURE_XSAVE)) put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags); else put_user_ex(0, &frame->uc.uc_flags); diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index f78801114ee1..259d1d2be076 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -210,28 +210,16 @@ static int enable_start_cpu0; */ static void notrace start_secondary(void *unused) { - unsigned long cr4 = __read_cr4(); - /* * Don't put *anything* except direct CPU state initialization * before cpu_init(), SMP booting is too fragile that we want to * limit the things done here to the most necessary things. */ - if (boot_cpu_has(X86_FEATURE_PCID)) - cr4 |= X86_CR4_PCIDE; - if (static_branch_likely(&cr_pinning)) - cr4 |= cr4_pinned_bits; - - __write_cr4(cr4); + cr4_init(); #ifdef CONFIG_X86_32 /* switch away from the initial page table */ load_cr3(swapper_pg_dir); - /* - * Initialize the CR4 shadow before doing anything that could - * try to read it. - */ - cr4_init_shadow(); __flush_tlb_all(); #endif load_current_idt(); diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c index 2abf27d7df6b..4f36d3241faf 100644 --- a/arch/x86/kernel/stacktrace.c +++ b/arch/x86/kernel/stacktrace.c @@ -129,11 +129,9 @@ void arch_stack_walk_user(stack_trace_consume_fn consume_entry, void *cookie, break; if ((unsigned long)fp < regs->sp) break; - if (frame.ret_addr) { - if (!consume_entry(cookie, frame.ret_addr, false)) - return; - } - if (fp == frame.next_fp) + if (!frame.ret_addr) + break; + if (!consume_entry(cookie, frame.ret_addr, false)) break; fp = frame.next_fp; } diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S index 147cd020516a..e2feacf921a0 100644 --- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -141,10 +141,10 @@ SECTIONS *(.text.__x86.indirect_thunk) __indirect_thunk_end = .; #endif - } :text = 0x9090 - /* End of text section */ - _etext = .; + /* End of text section */ + _etext = .; + } :text = 0x9090 NOTES :text :note |
