search for: __no_randomize_layout

...86/include/asm/paravirt_types.h >> index 9ffc36b..cf45726 100644 >> --- a/arch/x86/include/asm/paravirt_types.h >> +++ b/arch/x86/include/asm/paravirt_types.h >> @@ -324,6 +324,10 @@ struct pv_lock_ops { >> struct paravirt_callee_save vcpu_is_preempted; >> } __no_randomize_layout; >> >> +struct pv_idle_ops { >> + void (*poll)(void); >> +} __no_randomize_layout; >> + >> /* This contains all the paravirt structures: we get a convenient >> * number for each function using the offset which we use to indicate >> * what t...

...86/include/asm/paravirt_types.h >> index 9ffc36b..cf45726 100644 >> --- a/arch/x86/include/asm/paravirt_types.h >> +++ b/arch/x86/include/asm/paravirt_types.h >> @@ -324,6 +324,10 @@ struct pv_lock_ops { >> struct paravirt_callee_save vcpu_is_preempted; >> } __no_randomize_layout; >> >> +struct pv_idle_ops { >> + void (*poll)(void); >> +} __no_randomize_layout; >> + >> /* This contains all the paravirt structures: we get a convenient >> * number for each function using the offset which we use to indicate >> * what t...

...f --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h index 10cc3b9..95c0e3e 100644 --- a/arch/x86/include/asm/paravirt_types.h +++ b/arch/x86/include/asm/paravirt_types.h @@ -313,6 +313,10 @@ struct pv_lock_ops { struct paravirt_callee_save vcpu_is_preempted; } __no_randomize_layout; +struct pv_idle_ops { + void (*poll)(void); +} __no_randomize_layout; + /* This contains all the paravirt structures: we get a convenient * number for each function using the offset which we use to indicate * what to patch. */ @@ -323,6 +327,7 @@ struct paravirt_patch_template { struct pv...

...gt;>> +++ b/arch/x86/include/asm/paravirt_types.h >>> @@ -319,6 +319,7 @@ struct pv_lock_ops { >>> void (*kick)(int cpu); >>> >>> struct paravirt_callee_save vcpu_is_preempted; >>> + struct paravirt_callee_save virt_spin_lock; >>> } __no_randomize_layout; >>> >>> /* This contains all the paravirt structures: we get a convenient >>> diff --git a/arch/x86/include/asm/qspinlock.h b/arch/x86/include/asm/qspinlock.h >>> index 48a706f641f2..fbd98896385c 100644 >>> --- a/arch/x86/include/asm/qspinlock.h >...

...gt;>> +++ b/arch/x86/include/asm/paravirt_types.h >>> @@ -319,6 +319,7 @@ struct pv_lock_ops { >>> void (*kick)(int cpu); >>> >>> struct paravirt_callee_save vcpu_is_preempted; >>> + struct paravirt_callee_save virt_spin_lock; >>> } __no_randomize_layout; >>> >>> /* This contains all the paravirt structures: we get a convenient >>> diff --git a/arch/x86/include/asm/qspinlock.h b/arch/x86/include/asm/qspinlock.h >>> index 48a706f641f2..fbd98896385c 100644 >>> --- a/arch/x86/include/asm/qspinlock.h >...

...00644 > --- a/arch/x86/include/asm/paravirt_types.h > +++ b/arch/x86/include/asm/paravirt_types.h > @@ -319,6 +319,7 @@ struct pv_lock_ops { > void (*kick)(int cpu); > > struct paravirt_callee_save vcpu_is_preempted; > + struct paravirt_callee_save virt_spin_lock; > } __no_randomize_layout; > > /* This contains all the paravirt structures: we get a convenient > diff --git a/arch/x86/include/asm/qspinlock.h b/arch/x86/include/asm/qspinlock.h > index 48a706f641f2..fbd98896385c 100644 > --- a/arch/x86/include/asm/qspinlock.h > +++ b/arch/x86/include/asm/qspinlock.h...

...00644 > --- a/arch/x86/include/asm/paravirt_types.h > +++ b/arch/x86/include/asm/paravirt_types.h > @@ -319,6 +319,7 @@ struct pv_lock_ops { > void (*kick)(int cpu); > > struct paravirt_callee_save vcpu_is_preempted; > + struct paravirt_callee_save virt_spin_lock; > } __no_randomize_layout; > > /* This contains all the paravirt structures: we get a convenient > diff --git a/arch/x86/include/asm/qspinlock.h b/arch/x86/include/asm/qspinlock.h > index 48a706f641f2..fbd98896385c 100644 > --- a/arch/x86/include/asm/qspinlock.h > +++ b/arch/x86/include/asm/qspinlock.h...

From: Yang Zhang <yang.zhang.wz at gmail.com> Some latency-intensive workload have seen obviously performance drop when running inside VM. The main reason is that the overhead is amplified when running inside VM. The most cost I have seen is inside idle path. This patch introduces a new mechanism to poll for a while before entering idle state. If schedule is needed during poll, then we

From: Yang Zhang <yang.zhang.wz at gmail.com> Some latency-intensive workload have seen obviously performance drop when running inside VM. The main reason is that the overhead is amplified when running inside VM. The most cost I have seen is inside idle path. This patch introduces a new mechanism to poll for a while before entering idle state. If schedule is needed during poll, then we

With virt_spin_lock() being a pvops function the bare metal case can be optimized by patching the call away completely. In case a kernel running as a guest it can decide whether to use paravitualized spinlocks, the current fallback to the unfair test-and-set scheme, or to mimic the bare metal behavior. Juergen Gross (4): paravirt: add generic _paravirt_false() function paravirt: switch

With virt_spin_lock() being a pvops function the bare metal case can be optimized by patching the call away completely. In case a kernel running as a guest it can decide whether to use paravitualized spinlocks, the current fallback to the unfair test-and-set scheme, or to mimic the bare metal behavior. Juergen Gross (4): paravirt: add generic _paravirt_false() function paravirt: switch

...86/include/asm/paravirt_types.h >>>> @@ -319,6 +319,7 @@ struct pv_lock_ops { >>>> void (*kick)(int cpu); >>>> >>>> struct paravirt_callee_save vcpu_is_preempted; >>>> + struct paravirt_callee_save virt_spin_lock; >>>> } __no_randomize_layout; >>>> >>>> /* This contains all the paravirt structures: we get a convenient >>>> diff --git a/arch/x86/include/asm/qspinlock.h b/arch/x86/include/asm/qspinlock.h >>>> index 48a706f641f2..fbd98896385c 100644 >>>> --- a/arch/x86/include/...

...00644 > --- a/arch/x86/include/asm/paravirt_types.h > +++ b/arch/x86/include/asm/paravirt_types.h > @@ -319,6 +319,7 @@ struct pv_lock_ops { > void (*kick)(int cpu); > > struct paravirt_callee_save vcpu_is_preempted; > + struct paravirt_callee_save virt_spin_lock; > } __no_randomize_layout; > > /* This contains all the paravirt structures: we get a convenient > diff --git a/arch/x86/include/asm/qspinlock.h b/arch/x86/include/asm/qspinlock.h > index 48a706f641f2..fbd98896385c 100644 > --- a/arch/x86/include/asm/qspinlock.h > +++ b/arch/x86/include/asm/qspinlock.h...

...00644 > --- a/arch/x86/include/asm/paravirt_types.h > +++ b/arch/x86/include/asm/paravirt_types.h > @@ -319,6 +319,7 @@ struct pv_lock_ops { > void (*kick)(int cpu); > > struct paravirt_callee_save vcpu_is_preempted; > + struct paravirt_callee_save virt_spin_lock; > } __no_randomize_layout; > > /* This contains all the paravirt structures: we get a convenient > diff --git a/arch/x86/include/asm/qspinlock.h b/arch/x86/include/asm/qspinlock.h > index 48a706f641f2..fbd98896385c 100644 > --- a/arch/x86/include/asm/qspinlock.h > +++ b/arch/x86/include/asm/qspinlock.h...

...clude/asm/paravirt_types.h >> +++ b/arch/x86/include/asm/paravirt_types.h >> @@ -319,6 +319,7 @@ struct pv_lock_ops { >> void (*kick)(int cpu); >> >> struct paravirt_callee_save vcpu_is_preempted; >> + struct paravirt_callee_save virt_spin_lock; >> } __no_randomize_layout; >> >> /* This contains all the paravirt structures: we get a convenient >> diff --git a/arch/x86/include/asm/qspinlock.h b/arch/x86/include/asm/qspinlock.h >> index 48a706f641f2..fbd98896385c 100644 >> --- a/arch/x86/include/asm/qspinlock.h >> +++ b/arch/x86/...

This series removes some no longer needed stuff from paravirt infrastructure and puts large quantities of paravirt ops under a new config option PARAVIRT_XXL which is selected by XEN_PV only. A pvops kernel without XEN_PV being configured is about 2.5% smaller with this series applied. tip commit 5800dc5c19f34e6e03b5adab1282535cb102fafd ("x86/paravirt: Fix spectre-v2 mitigations for

...pes.h index 19efefc0e27e..928f5e7953a7 100644 --- a/arch/x86/include/asm/paravirt_types.h +++ b/arch/x86/include/asm/paravirt_types.h @@ -319,6 +319,7 @@ struct pv_lock_ops { void (*kick)(int cpu); struct paravirt_callee_save vcpu_is_preempted; + struct paravirt_callee_save virt_spin_lock; } __no_randomize_layout; /* This contains all the paravirt structures: we get a convenient diff --git a/arch/x86/include/asm/qspinlock.h b/arch/x86/include/asm/qspinlock.h index 48a706f641f2..fbd98896385c 100644 --- a/arch/x86/include/asm/qspinlock.h +++ b/arch/x86/include/asm/qspinlock.h @@ -17,6 +17,25 @@ static inli...

...include/asm/paravirt_types.h > @@ -86,6 +86,9 @@ struct pv_init_ops { > */ > unsigned (*patch)(u8 type, u16 clobber, void *insnbuf, > unsigned long addr, unsigned len); > + > + /* called right after we finish boot allocator */ > + void (*after_bootmem)(void); > } __no_randomize_layout; > > > diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c > index 99dc79e76bdc..7b5f931e2e3a 100644 > --- a/arch/x86/kernel/paravirt.c > +++ b/arch/x86/kernel/paravirt.c > @@ -315,6 +315,7 @@ struct pv_info pv_info = { > > struct pv_init_ops pv_in...

...asm/paravirt_types.h @@ -84,7 +84,7 @@ struct pv_init_ops { * the number of bytes of code generated, as we nop pad the * rest in generic code. */ - unsigned (*patch)(u8 type, u16 clobber, void *insnbuf, + unsigned (*patch)(u8 type, void *insnbuf, unsigned long addr, unsigned len); } __no_randomize_layout; @@ -370,14 +370,13 @@ extern struct pv_lock_ops pv_lock_ops; unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len); unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len); -unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf, +unsigned paravirt_patch_default(u...

This series removes some no longer needed stuff from paravirt infrastructure and puts large quantities of paravirt ops under a new config option PARAVIRT_XXL which is selected by XEN_PV only. A pvops kernel without XEN_PV being configured is about 2.5% smaller with this series applied. tip commit 5800dc5c19f34e6e03b5adab1282535cb102fafd ("x86/paravirt: Fix spectre-v2 mitigations for