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Red Hat Bugzilla – Attachment 297808 Details for
Bug 431081
[RHEL4.6]: Under load, an i386 PV guest on i386 HV will hang during save/restore
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Posted attachment for 4.7 inclusion
hotplug-vcpu-stack-overflow.patch.el4 (text/plain), 4.08 KB, created by
Don Dutile (Red Hat)
on 2008-03-12 17:21:00 UTC
(
hide
)
Description:
Posted attachment for 4.7 inclusion
Filename:
MIME Type:
Creator:
Don Dutile (Red Hat)
Created:
2008-03-12 17:21:00 UTC
Size:
4.08 KB
patch
obsolete
>--- linux-2.6.9/drivers/xen/core/smpboot.c.orig 2008-03-11 15:57:44.000000000 -0400 >+++ linux-2.6.9/drivers/xen/core/smpboot.c 2008-03-11 16:22:24.000000000 -0400 >@@ -172,9 +172,9 @@ > cpu_idle(); > } > >-static void cpu_initialize_context(unsigned int cpu) >+static int cpu_initialize_context(unsigned int cpu) > { >- vcpu_guest_context_t ctxt; >+ vcpu_guest_context_t *ctxt; > struct task_struct *idle = idle_task(cpu); > #ifdef __x86_64__ > struct desc_ptr *gdt_descr = &cpu_gdt_descr[cpu]; >@@ -183,58 +183,65 @@ > #endif > > if (cpu_test_and_set(cpu, cpu_initialized_map)) >- return; >+ return 0; > >- memset(&ctxt, 0, sizeof(ctxt)); >+ ctxt = kmalloc(sizeof(*ctxt), GFP_KERNEL); >+ if (ctxt == NULL) >+ return -ENOMEM; > >- ctxt.flags = VGCF_IN_KERNEL; >- ctxt.user_regs.ds = __USER_DS; >- ctxt.user_regs.es = __USER_DS; >- ctxt.user_regs.fs = 0; >- ctxt.user_regs.gs = 0; >- ctxt.user_regs.ss = __KERNEL_DS; >- ctxt.user_regs.eip = (unsigned long)cpu_bringup_and_idle; >- ctxt.user_regs.eflags = X86_EFLAGS_IF | 0x1000; /* IOPL_RING1 */ >+ memset(ctxt, 0, sizeof(*ctxt)); > >- memset(&ctxt.fpu_ctxt, 0, sizeof(ctxt.fpu_ctxt)); >+ ctxt->flags = VGCF_IN_KERNEL; >+ ctxt->user_regs.ds = __USER_DS; >+ ctxt->user_regs.es = __USER_DS; >+ ctxt->user_regs.fs = 0; >+ ctxt->user_regs.gs = 0; >+ ctxt->user_regs.ss = __KERNEL_DS; >+ ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle; >+ ctxt->user_regs.eflags = X86_EFLAGS_IF | 0x1000; /* IOPL_RING1 */ > >- smp_trap_init(ctxt.trap_ctxt); >+ memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt)); > >- ctxt.ldt_ents = 0; >+ smp_trap_init(ctxt->trap_ctxt); > >- ctxt.gdt_frames[0] = virt_to_mfn(gdt_descr->address); >- ctxt.gdt_ents = gdt_descr->size / 8; >+ ctxt->ldt_ents = 0; >+ >+ ctxt->gdt_frames[0] = virt_to_mfn(gdt_descr->address); >+ ctxt->gdt_ents = gdt_descr->size / 8; > > #ifdef __i386__ >- ctxt.user_regs.cs = __KERNEL_CS; >- ctxt.user_regs.esp = idle->thread.esp0 - sizeof(struct pt_regs); >+ ctxt->user_regs.cs = __KERNEL_CS; >+ ctxt->user_regs.esp = idle->thread.esp0 - sizeof(struct pt_regs); > >- ctxt.kernel_ss = __KERNEL_DS; >- ctxt.kernel_sp = idle->thread.esp0; >+ ctxt->kernel_ss = __KERNEL_DS; >+ ctxt->kernel_sp = idle->thread.esp0; > >- ctxt.event_callback_cs = __KERNEL_CS; >- ctxt.event_callback_eip = (unsigned long)hypervisor_callback; >- ctxt.failsafe_callback_cs = __KERNEL_CS; >- ctxt.failsafe_callback_eip = (unsigned long)failsafe_callback; >+ ctxt->event_callback_cs = __KERNEL_CS; >+ ctxt->event_callback_eip = (unsigned long)hypervisor_callback; >+ ctxt->failsafe_callback_cs = __KERNEL_CS; >+ ctxt->failsafe_callback_eip = (unsigned long)failsafe_callback; > >- ctxt.ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir)); >+ ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir)); > #else /* __x86_64__ */ >- ctxt.user_regs.cs = __KERNEL_CS; >- ctxt.user_regs.esp = idle->thread.rsp0 - sizeof(struct pt_regs); >+ ctxt->user_regs.cs = __KERNEL_CS; >+ ctxt->user_regs.esp = idle->thread.rsp0 - sizeof(struct pt_regs); > >- ctxt.kernel_ss = __KERNEL_DS; >- ctxt.kernel_sp = idle->thread.rsp0; >+ ctxt->kernel_ss = __KERNEL_DS; >+ ctxt->kernel_sp = idle->thread.rsp0; > >- ctxt.event_callback_eip = (unsigned long)hypervisor_callback; >- ctxt.failsafe_callback_eip = (unsigned long)failsafe_callback; >- ctxt.syscall_callback_eip = (unsigned long)system_call; >+ ctxt->event_callback_eip = (unsigned long)hypervisor_callback; >+ ctxt->failsafe_callback_eip = (unsigned long)failsafe_callback; >+ ctxt->syscall_callback_eip = (unsigned long)system_call; > >- ctxt.ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(init_level4_pgt)); >+ ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(init_level4_pgt)); > >- ctxt.gs_base_kernel = (unsigned long)(&cpu_pda[cpu]); >+ ctxt->gs_base_kernel = (unsigned long)(&cpu_pda[cpu]); > #endif > >- BUG_ON(HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, &ctxt)); >+ BUG_ON(HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt)); >+ >+ kfree(ctxt); >+ return 0; > } > > void __init smp_prepare_cpus(unsigned int max_cpus) >@@ -429,7 +436,9 @@ > if (rc) > return rc; > >- cpu_initialize_context(cpu); >+ rc = cpu_initialize_context(cpu); >+ if (rc) >+ return rc; > > #ifdef CONFIG_SMP_ALTERNATIVES > if (num_online_cpus() == 1)
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bug 431081
: 297808