search for: switch_to

...+ + return 0; +} + +#endif /* _X86_KERNEL_PROCESS_IO_H */ diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c index 884f98f..e86028b 100644 --- a/arch/x86/kernel/process_32.c +++ b/arch/x86/kernel/process_32.c @@ -56,6 +56,8 @@ #include <asm/debugreg.h> #include <asm/switch_to.h> +#include "process-io.h" + asmlinkage void ret_from_fork(void) __asm__("ret_from_fork"); asmlinkage void ret_from_kernel_thread(void) __asm__("ret_from_kernel_thread"); @@ -135,7 +137,6 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, { st...

In debugging the sles9 port on 64 bit MP machines, I am seeing a problem where the hypervisor takes a fault in loading fs in the context switch code (load_segments()). The selector is one of the TLS selectors. It appears that the cpu in question has updated this selector with a value of 0 just prior to the problem I am seeing. Looking at the Linux context switch code, we first update the TLS

This patch set is intended for the next merge window. They are just enhancements of the already merged patches or ia64 porting from x86 paravirt techniques and that their quality is enough for merge. This patch set is for binary patch optimization for paravirt_ops. The binary patch optimization is important on native case because the paravirt_ops overhead can be reduced by converting indirect

This patch set is intended for the next merge window. They are just enhancements of the already merged patches or ia64 porting from x86 paravirt techniques and that their quality is enough for merge. This patch set is for binary patch optimization for paravirt_ops. The binary patch optimization is important on native case because the paravirt_ops overhead can be reduced by converting indirect

This patch set is intended for the next merge window. They are just enhancements of the already merged patches or ia64 porting from x86 paravirt techniques and that their quality is enough for merge. This patch set is for binary patch optimization for paravirt_ops which depends on the patch series I sent out, ia64/pv_ops, xen: more paravirtualization. The binary patch optimization is important on

This patch set is intended for the next merge window. They are just enhancements of the already merged patches or ia64 porting from x86 paravirt techniques and that their quality is enough for merge. This patch set is for binary patch optimization for paravirt_ops which depends on the patch series I sent out, ia64/pv_ops, xen: more paravirtualization. The binary patch optimization is important on

This patch set is for the next merge window. They are just enhancements of the already merged patches or ia64 porting from x86 paravirt techniques and that their quality is enough for merge. This patch set is for binary patch optimization for paravirt_ops which depends on the patch series I sent out, ia64/pv_ops, xen: more paravirtualization. The binary patch optimization is important on native

This patch set is for the next merge window. They are just enhancements of the already merged patches or ia64 porting from x86 paravirt techniques and that their quality is enough for merge. This patch set is for binary patch optimization for paravirt_ops which depends on the patch series I sent out, ia64/pv_ops, xen: more paravirtualization. The binary patch optimization is important on native

...aps.c~lguest-export-symbols-for-lguest-as-a-module arch/i386/kernel/traps.c --- a/arch/i386/kernel/traps.c~lguest-export-symbols-for-lguest-as-a-module +++ a/arch/i386/kernel/traps.c @@ -1058,6 +1058,7 @@ asmlinkage void math_state_restore(void) thread->status |= TS_USEDFPU; /* So we fnsave on switch_to() */ tsk->fpu_counter++; } +EXPORT_SYMBOL_GPL(math_state_restore); #ifndef CONFIG_MATH_EMULATION diff -puN kernel/fork.c~lguest-export-symbols-for-lguest-as-a-module kernel/fork.c --- a/kernel/fork.c~lguest-export-symbols-for-lguest-as-a-module +++ a/kernel/fork.c @@ -126,6 +126,7 @@ voi...

...aps.c~lguest-export-symbols-for-lguest-as-a-module arch/i386/kernel/traps.c --- a/arch/i386/kernel/traps.c~lguest-export-symbols-for-lguest-as-a-module +++ a/arch/i386/kernel/traps.c @@ -1058,6 +1058,7 @@ asmlinkage void math_state_restore(void) thread->status |= TS_USEDFPU; /* So we fnsave on switch_to() */ tsk->fpu_counter++; } +EXPORT_SYMBOL_GPL(math_state_restore); #ifndef CONFIG_MATH_EMULATION diff -puN kernel/fork.c~lguest-export-symbols-for-lguest-as-a-module kernel/fork.c --- a/kernel/fork.c~lguest-export-symbols-for-lguest-as-a-module +++ a/kernel/fork.c @@ -126,6 +126,7 @@ voi...

This patch set is for binary patch optimization for paravirt_ops. The binary patch optimization is important on native case because the paravirt_ops overhead can be reduced by converting indirect call into in-place execution or direct call. The first patch imports helper functions which themselves doesn't interesting things. The second patch replaces the indirect function calls with a

This patch set is for binary patch optimization for paravirt_ops. The binary patch optimization is important on native case because the paravirt_ops overhead can be reduced by converting indirect call into in-place execution or direct call. The first patch imports helper functions which themselves doesn't interesting things. The second patch replaces the indirect function calls with a

...2006 -0800 @@ -665,6 +665,31 @@ struct task_struct fastcall * __switch_t load_TLS(next, cpu); /* + * Now maybe handle debug registers and/or IO bitmaps + */ + if (unlikely((task_thread_info(next_p)->flags & _TIF_WORK_CTXSW) + || test_tsk_thread_flag(prev_p, TIF_IO_BITMAP))) + __switch_to_xtra(next_p, tss); + + disable_tsc(prev_p, next_p); + + /* + * Leave lazy mode, flushing any hypercalls made here. + * This must be done before restoring TLS segments so + * the GDT and LDT are properly updated, and must be + * done before math_state_restore, so the TS bit is up + * to date. +...

...2006 -0800 @@ -665,6 +665,31 @@ struct task_struct fastcall * __switch_t load_TLS(next, cpu); /* + * Now maybe handle debug registers and/or IO bitmaps + */ + if (unlikely((task_thread_info(next_p)->flags & _TIF_WORK_CTXSW) + || test_tsk_thread_flag(prev_p, TIF_IO_BITMAP))) + __switch_to_xtra(next_p, tss); + + disable_tsc(prev_p, next_p); + + /* + * Leave lazy mode, flushing any hypercalls made here. + * This must be done before restoring TLS segments so + * the GDT and LDT are properly updated, and must be + * done before math_state_restore, so the TS bit is up + * to date. +...

...rig/include/asm-um/system-generic.h 2005-06-17 15:48:29.000000000 -0400 +++ linux-2.6.13-rc5-mm1-abi/include/asm-um/system-generic.h 2005-08-16 11:32:15.000000000 -0400 @@ -1,19 +1,7 @@ #ifndef __UM_SYSTEM_GENERIC_H #define __UM_SYSTEM_GENERIC_H -#include "asm/arch/system.h" - -#undef switch_to -#undef local_irq_save -#undef local_irq_restore -#undef local_irq_disable -#undef local_irq_enable -#undef local_save_flags -#undef local_irq_restore -#undef local_irq_enable -#undef local_irq_disable -#undef local_irq_save -#undef irqs_disabled +#include "asm/arch/system-abi.h" exter...

...rig/include/asm-um/system-generic.h 2005-06-17 15:48:29.000000000 -0400 +++ linux-2.6.13-rc5-mm1-abi/include/asm-um/system-generic.h 2005-08-16 11:32:15.000000000 -0400 @@ -1,19 +1,7 @@ #ifndef __UM_SYSTEM_GENERIC_H #define __UM_SYSTEM_GENERIC_H -#include "asm/arch/system.h" - -#undef switch_to -#undef local_irq_save -#undef local_irq_restore -#undef local_irq_disable -#undef local_irq_enable -#undef local_save_flags -#undef local_irq_restore -#undef local_irq_enable -#undef local_irq_disable -#undef local_irq_save -#undef irqs_disabled +#include "asm/arch/system-abi.h" exter...

...*vaddr) arch_kmap_local_pre_unmap(addr); pte_clear(&init_mm, addr, kmap_pte - idx); arch_kmap_local_post_unmap(addr); + current->kmap_ctrl.pteval[kmap_local_idx()] = __pte(0); kmap_local_idx_pop(); preempt_enable(); } EXPORT_SYMBOL(kunmap_local_indexed); + +/* + * Invoked before switch_to(). This is safe even when during or after + * clearing the maps an interrupt which needs a kmap_local happens because + * the task::kmap_ctrl.idx is not modified by the unmapping code so a + * nested kmap_local will use the next unused index and restore the index + * on unmap. The already cleared k...

...f needed. + */ + if (unlikely(prev->iopl != next->iopl)) + set_iopl_mask(next->iopl); + + /* + * Now maybe handle debug registers and/or IO bitmaps + */ + if (unlikely((task_thread_info(next_p)->flags & _TIF_WORK_CTXSW) + || test_tsk_thread_flag(prev_p, TIF_IO_BITMAP))) + __switch_to_xtra(next_p, tss); + + /* + * Leave lazy mode, flushing any hypercalls made here. + * This must be done before restoring TLS segments so + * the GDT and LDT are properly updated, and must be + * done before math_state_restore, so the TS bit is up + * to date. + */ + arch_leave_lazy_cpu_mode()...

...f needed. + */ + if (unlikely(prev->iopl != next->iopl)) + set_iopl_mask(next->iopl); + + /* + * Now maybe handle debug registers and/or IO bitmaps + */ + if (unlikely((task_thread_info(next_p)->flags & _TIF_WORK_CTXSW) + || test_tsk_thread_flag(prev_p, TIF_IO_BITMAP))) + __switch_to_xtra(next_p, tss); + + /* + * Leave lazy mode, flushing any hypercalls made here. + * This must be done before restoring TLS segments so + * the GDT and LDT are properly updated, and must be + * done before math_state_restore, so the TS bit is up + * to date. + */ + arch_leave_lazy_cpu_mode()...

...+ + return 0; +} + +#endif /* _X86_KERNEL_PROCESS_IO_H */ diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c index 0de43e9..73a38c8 100644 --- a/arch/x86/kernel/process_32.c +++ b/arch/x86/kernel/process_32.c @@ -55,6 +55,8 @@ #include <asm/debugreg.h> #include <asm/switch_to.h> +#include "process-io.h" + asmlinkage void ret_from_fork(void) __asm__("ret_from_fork"); asmlinkage void ret_from_kernel_thread(void) __asm__("ret_from_kernel_thread"); @@ -134,7 +136,6 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, { st...