search for: arch_local_irq_disable

...1049] [<ffffffff810cf54c>] ? tlb_finish_mmu+0xc/0x31 [354008.101054] [<ffffffff810d5e79>] ? exit_mmap+0xc4/0xe9 [354008.101060] [<ffffffff81044b82>] ? mmput+0x56/0xf8 [354008.101064] [<ffffffff81049d07>] ? exit_mm+0x117/0x122 [354008.101069] [<ffffffff8107115b>] ? arch_local_irq_disable+0x7/0x8 [354008.101074] [<ffffffff81350487>] ? _raw_spin_lock_irq+0xa/0x14 [354008.101078] [<ffffffff8107115b>] ? arch_local_irq_disable+0x7/0x8 [354008.101083] [<ffffffff81049f57>] ? do_exit+0x245/0x713 [354008.101088] [<ffffffff81039a92>] ? finish_task_switch+0x4e/0xb9...

...810cf54c>] ? tlb_finish_mmu+0xc/0x31 > [354008.101054] [<ffffffff810d5e79>] ? exit_mmap+0xc4/0xe9 > [354008.101060] [<ffffffff81044b82>] ? mmput+0x56/0xf8 > [354008.101064] [<ffffffff81049d07>] ? exit_mm+0x117/0x122 > [354008.101069] [<ffffffff8107115b>] ? arch_local_irq_disable+0x7/0x8 > [354008.101074] [<ffffffff81350487>] ? _raw_spin_lock_irq+0xa/0x14 > [354008.101078] [<ffffffff8107115b>] ? arch_local_irq_disable+0x7/0x8 > [354008.101083] [<ffffffff81049f57>] ? do_exit+0x245/0x713 > [354008.101088] [<ffffffff81039a92>] ? finish_t...

...PVOP_CALLEE0(unsigned long, irq.save_fl); > } > > -static inline notrace void arch_local_irq_restore(unsigned long f) > +static inline noinstr void arch_local_irq_restore(unsigned long f) > { > PVOP_VCALLEE1(irq.restore_fl, f); > } > > -static inline notrace void arch_local_irq_disable(void) > +static inline noinstr void arch_local_irq_disable(void) > { > PVOP_VCALLEE0(irq.irq_disable); > } > > -static inline notrace void arch_local_irq_enable(void) > +static inline noinstr void arch_local_irq_enable(void) > { > PVOP_VCALLEE0(irq.irq_enable); &...

...8.413801] Call Trace: Jul 16 20:41:01 placka kernel: [28018.413801] [<ffffffff81046cd9>] ? warn_slowpath_common+0x78/0x8c Jul 16 20:41:01 placka kernel: [28018.413801] [<ffffffff81049d71>] ? do_exit+0x5f/0x713 Jul 16 20:41:01 placka kernel: [28018.413801] [<ffffffff8107115b>] ? arch_local_irq_disable+0x7/0x8 Jul 16 20:41:01 placka kernel: [28018.413801] [<ffffffff8107116d>] ? arch_local_irq_save+0x11/0x17 Jul 16 20:41:01 placka kernel: [28018.413801] [<ffffffff81071153>] ? arch_local_irq_restore+0x7/0x8 Jul 16 20:41:01 placka kernel: [28018.413801] [<ffffffff813505cf>] ? _r...

This changes the pv ops code generation to more closely match reality. For example, instead of: callq *0xffffffff81e3a400 (pv_irq_ops.save_fl) vmlinux will now show: pushfq pop %rax nop nop nop nop nop which is what the runtime version of the code will show in most cases. This idea was suggested by Andy Lutomirski. The benefits are: - For the most common runtime cases

This changes the pv ops code generation to more closely match reality. For example, instead of: callq *0xffffffff81e3a400 (pv_irq_ops.save_fl) vmlinux will now show: pushfq pop %rax nop nop nop nop nop which is what the runtime version of the code will show in most cases. This idea was suggested by Andy Lutomirski. The benefits are: - For the most common runtime cases

Today paravirtualization is a all-or-nothing game: either a kernel is compiled with no paravirtualization support at all, or it is supporting paravirtualized environments like Xen pv-guests or lguest additionally to some paravirtualized tuning for KVM, Hyperv, VMWare or Xen HVM-guests. As support of pv-guests requires quite intrusive pv-hooks (e.g. all access functions to page table entries,

Today paravirtualization is a all-or-nothing game: either a kernel is compiled with no paravirtualization support at all, or it is supporting paravirtualized environments like Xen pv-guests or lguest additionally to some paravirtualized tuning for KVM, Hyperv, VMWare or Xen HVM-guests. As support of pv-guests requires quite intrusive pv-hooks (e.g. all access functions to page table entries,

...t; @@ -762,11 +763,6 @@ static inline notrace unsigned long arch_local_save_flags(void) return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl); } -static inline notrace void arch_local_irq_restore(unsigned long f) -{ - PVOP_VCALLEE1(pv_irq_ops.restore_fl, f); -} - static inline notrace void arch_local_irq_disable(void) { PVOP_VCALLEE0(pv_irq_ops.irq_disable); @@ -786,6 +782,16 @@ static inline notrace unsigned long arch_local_irq_save(void) return f; } +/* + * In a VM, setting the IF flag can cause an expensive VM exit. So if + * interrupt was disabled before arch_local_irq_save(), we don't need...

...t; @@ -762,11 +763,6 @@ static inline notrace unsigned long arch_local_save_flags(void) return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl); } -static inline notrace void arch_local_irq_restore(unsigned long f) -{ - PVOP_VCALLEE1(pv_irq_ops.restore_fl, f); -} - static inline notrace void arch_local_irq_disable(void) { PVOP_VCALLEE0(pv_irq_ops.irq_disable); @@ -786,6 +782,16 @@ static inline notrace unsigned long arch_local_irq_save(void) return f; } +/* + * In a VM, setting the IF flag can cause an expensive VM exit. So if + * interrupt was disabled before arch_local_irq_save(), we don't need...

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

...nk_screen+0x142/0x142 Sep 5 17:11:25 pcale kernel: [11959.375261] [<ffffffff810ec9f7>] ? kmem_cache_alloc+0x20/0xea Sep 5 17:11:25 pcale kernel: [11959.375264] [<ffffffff810985db>] ? taskstats_exit+0x53/0x2e0 Sep 5 17:11:25 pcale kernel: [11959.375267] [<ffffffff81070df3>] ? arch_local_irq_disable+0x7/0x8 Sep 5 17:11:25 pcale kernel: [11959.375269] [<ffffffff8134eb5f>] ? _raw_spin_lock_irq+0xa/0x14 Sep 5 17:11:25 pcale kernel: [11959.375272] [<ffffffff81049de3>] ? do_exit+0x23d/0x713 Sep 5 17:11:25 pcale kernel: [11959.375274] [<ffffffff81070df3>] ? arch_local_irq_dis...