From 66c7ceb47f628c8bd4f84a6d01c2725ded6a342d Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Sun, 14 Apr 2019 18:00:04 +0200 Subject: [PATCH] x86/irq/32: Handle irq stack allocation failure proper irq_ctx_init() crashes hard on page allocation failures. While that's ok during early boot, it's just wrong in the CPU hotplug bringup code. Check the page allocation failure and return -ENOMEM and handle it at the call sites. On early boot the only way out is to BUG(), but on CPU hotplug there is no reason to crash, so just abort the operation. Rename the function to something more sensible while at it. Signed-off-by: Thomas Gleixner Signed-off-by: Borislav Petkov Cc: Alison Schofield Cc: Andrew Morton Cc: Andy Lutomirski Cc: Anshuman Khandual Cc: Boris Ostrovsky Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Josh Poimboeuf Cc: Juergen Gross Cc: Konrad Rzeszutek Wilk Cc: Nicolai Stange Cc: Pu Wen Cc: Sean Christopherson Cc: Shaokun Zhang Cc: Stefano Stabellini Cc: Suravee Suthikulpanit Cc: x86-ml Cc: xen-devel@lists.xenproject.org Cc: Yazen Ghannam Cc: Yi Wang Cc: Zhenzhong Duan Link: https://lkml.kernel.org/r/20190414160146.089060584@linutronix.de --- arch/x86/include/asm/irq.h | 4 ++-- arch/x86/include/asm/smp.h | 2 +- arch/x86/kernel/irq_32.c | 32 ++++++++++++++++---------------- arch/x86/kernel/irqinit.c | 2 +- arch/x86/kernel/smpboot.c | 15 ++++++++++++--- arch/x86/xen/smp_pv.c | 4 +++- 6 files changed, 35 insertions(+), 24 deletions(-) diff --git a/arch/x86/include/asm/irq.h b/arch/x86/include/asm/irq.h index fbb16e6b6c18..d751e8440a6b 100644 --- a/arch/x86/include/asm/irq.h +++ b/arch/x86/include/asm/irq.h @@ -17,9 +17,9 @@ static inline int irq_canonicalize(int irq) } #ifdef CONFIG_X86_32 -extern void irq_ctx_init(int cpu); +extern int irq_init_percpu_irqstack(unsigned int cpu); #else -# define irq_ctx_init(cpu) do { } while (0) +static inline int irq_init_percpu_irqstack(unsigned int cpu) { return 0; } #endif #define __ARCH_HAS_DO_SOFTIRQ diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h index 2e95b6c1bca3..da545df207b2 100644 --- a/arch/x86/include/asm/smp.h +++ b/arch/x86/include/asm/smp.h @@ -131,7 +131,7 @@ void native_smp_prepare_boot_cpu(void); void native_smp_prepare_cpus(unsigned int max_cpus); void calculate_max_logical_packages(void); void native_smp_cpus_done(unsigned int max_cpus); -void common_cpu_up(unsigned int cpunum, struct task_struct *tidle); +int common_cpu_up(unsigned int cpunum, struct task_struct *tidle); int native_cpu_up(unsigned int cpunum, struct task_struct *tidle); int native_cpu_disable(void); int common_cpu_die(unsigned int cpu); diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c index f37489c806fa..fc34816c6f04 100644 --- a/arch/x86/kernel/irq_32.c +++ b/arch/x86/kernel/irq_32.c @@ -107,28 +107,28 @@ static inline int execute_on_irq_stack(int overflow, struct irq_desc *desc) } /* - * allocate per-cpu stacks for hardirq and for softirq processing + * Allocate per-cpu stacks for hardirq and softirq processing */ -void irq_ctx_init(int cpu) +int irq_init_percpu_irqstack(unsigned int cpu) { - struct irq_stack *irqstk; + int node = cpu_to_node(cpu); + struct page *ph, *ps; if (per_cpu(hardirq_stack_ptr, cpu)) - return; - - irqstk = page_address(alloc_pages_node(cpu_to_node(cpu), - THREADINFO_GFP, - THREAD_SIZE_ORDER)); - per_cpu(hardirq_stack_ptr, cpu) = irqstk; + return 0; - irqstk = page_address(alloc_pages_node(cpu_to_node(cpu), - THREADINFO_GFP, - THREAD_SIZE_ORDER)); - per_cpu(softirq_stack_ptr, cpu) = irqstk; + ph = alloc_pages_node(node, THREADINFO_GFP, THREAD_SIZE_ORDER); + if (!ph) + return -ENOMEM; + ps = alloc_pages_node(node, THREADINFO_GFP, THREAD_SIZE_ORDER); + if (!ps) { + __free_pages(ph, THREAD_SIZE_ORDER); + return -ENOMEM; + } - pr_debug("CPU %u irqstacks, hard=%p soft=%p\n", - cpu, per_cpu(hardirq_stack_ptr, cpu), - per_cpu(softirq_stack_ptr, cpu)); + per_cpu(hardirq_stack_ptr, cpu) = page_address(ph); + per_cpu(softirq_stack_ptr, cpu) = page_address(ps); + return 0; } void do_softirq_own_stack(void) diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c index 26b5cb5386b9..16919a9671fa 100644 --- a/arch/x86/kernel/irqinit.c +++ b/arch/x86/kernel/irqinit.c @@ -91,7 +91,7 @@ void __init init_IRQ(void) for (i = 0; i < nr_legacy_irqs(); i++) per_cpu(vector_irq, 0)[ISA_IRQ_VECTOR(i)] = irq_to_desc(i); - irq_ctx_init(smp_processor_id()); + BUG_ON(irq_init_percpu_irqstack(smp_processor_id())); x86_init.irqs.intr_init(); } diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index ce1a67b70168..c92b21f9e9dc 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -935,20 +935,27 @@ out: return boot_error; } -void common_cpu_up(unsigned int cpu, struct task_struct *idle) +int common_cpu_up(unsigned int cpu, struct task_struct *idle) { + int ret; + /* Just in case we booted with a single CPU. */ alternatives_enable_smp(); per_cpu(current_task, cpu) = idle; + /* Initialize the interrupt stack(s) */ + ret = irq_init_percpu_irqstack(cpu); + if (ret) + return ret; + #ifdef CONFIG_X86_32 /* Stack for startup_32 can be just as for start_secondary onwards */ - irq_ctx_init(cpu); per_cpu(cpu_current_top_of_stack, cpu) = task_top_of_stack(idle); #else initial_gs = per_cpu_offset(cpu); #endif + return 0; } /* @@ -1106,7 +1113,9 @@ int native_cpu_up(unsigned int cpu, struct task_struct *tidle) /* the FPU context is blank, nobody can own it */ per_cpu(fpu_fpregs_owner_ctx, cpu) = NULL; - common_cpu_up(cpu, tidle); + err = common_cpu_up(cpu, tidle); + if (err) + return err; err = do_boot_cpu(apicid, cpu, tidle, &cpu0_nmi_registered); if (err) { diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c index 145506f9fdbe..590fcf863006 100644 --- a/arch/x86/xen/smp_pv.c +++ b/arch/x86/xen/smp_pv.c @@ -361,7 +361,9 @@ static int xen_pv_cpu_up(unsigned int cpu, struct task_struct *idle) { int rc; - common_cpu_up(cpu, idle); + rc = common_cpu_up(cpu, idle); + if (rc) + return rc; xen_setup_runstate_info(cpu); -- 2.30.2