search for: start_pv_lock_ops_vcpu_is_preempted

...nel/paravirt_patch_32.c @@ -56,15 +56,19 @@ unsigned native_patch(u8 type, u16 clobb end = end_pv_lock_ops_queued_spin_unlock; goto patch_site; } + goto patch_default; + case PARAVIRT_PATCH(pv_lock_ops.vcpu_is_preempted): if (pv_is_native_vcpu_is_preempted()) { start = start_pv_lock_ops_vcpu_is_preempted; end = end_pv_lock_ops_vcpu_is_preempted; goto patch_site; } + goto patch_default; #endif default: +patch_default: ret = paravirt_patch_default(type, clobbers, ibuf, addr, len); break; --- a/arch/x86/kernel/paravirt_patch_64.c +++ b/arch/x86/kernel/paravirt_patch_64.c...

...*ibuf, unsigned long addr, unsigned len) @@ -54,6 +56,12 @@ unsigned native_patch(u8 type, u16 clobb end = end_pv_lock_ops_queued_spin_unlock; goto patch_site; } + case PARAVIRT_PATCH(pv_lock_ops.vcpu_is_preempted): + if (pv_is_native_vcpu_is_preempted()) { + start = start_pv_lock_ops_vcpu_is_preempted; + end = end_pv_lock_ops_vcpu_is_preempted; + goto patch_site; + } #endif default: --- a/arch/x86/kernel/paravirt_patch_64.c +++ b/arch/x86/kernel/paravirt_patch_64.c @@ -20,6 +20,7 @@ DEF_NATIVE(, mov64, "mov %rdi, %rax"); #if defined(CONFIG_PARAVIRT_SPINLOCKS) DEF_NAT...

...*ibuf, unsigned long addr, unsigned len) @@ -54,6 +56,12 @@ unsigned native_patch(u8 type, u16 clobb end = end_pv_lock_ops_queued_spin_unlock; goto patch_site; } + case PARAVIRT_PATCH(pv_lock_ops.vcpu_is_preempted): + if (pv_is_native_vcpu_is_preempted()) { + start = start_pv_lock_ops_vcpu_is_preempted; + end = end_pv_lock_ops_vcpu_is_preempted; + goto patch_site; + } #endif default: --- a/arch/x86/kernel/paravirt_patch_64.c +++ b/arch/x86/kernel/paravirt_patch_64.c @@ -20,6 +20,7 @@ DEF_NATIVE(, mov64, "mov %rdi, %rax"); #if defined(CONFIG_PARAVIRT_SPINLOCKS) DEF_NAT...

Two patches that cure fallout from commit: 3cded4179481 ("x86/paravirt: Optimize native pv_lock_ops.vcpu_is_preempted()")

Two patches that cure fallout from commit: 3cded4179481 ("x86/paravirt: Optimize native pv_lock_ops.vcpu_is_preempted()")

...: + if (pv_is_native_spin_unlock()) { + start = start_pv_lock_ops_queued_spin_unlock; + end = end_pv_lock_ops_queued_spin_unlock; + goto patch_site; + } + goto patch_default; - case PARAVIRT_PATCH(pv_lock_ops.vcpu_is_preempted): - if (pv_is_native_vcpu_is_preempted()) { - start = start_pv_lock_ops_vcpu_is_preempted; - end = end_pv_lock_ops_vcpu_is_preempted; - goto patch_site; - } - goto patch_default; -#endif + case PARAVIRT_PATCH(pv_lock_ops.vcpu_is_preempted): + if (pv_is_native_vcpu_is_preempted()) { + start = start_pv_lock_ops_vcpu_is_preempted; + end = end_pv_lock_ops_vcpu_is_preempte...

...: + if (pv_is_native_spin_unlock()) { + start = start_pv_lock_ops_queued_spin_unlock; + end = end_pv_lock_ops_queued_spin_unlock; + goto patch_site; + } + goto patch_default; - case PARAVIRT_PATCH(pv_lock_ops.vcpu_is_preempted): - if (pv_is_native_vcpu_is_preempted()) { - start = start_pv_lock_ops_vcpu_is_preempted; - end = end_pv_lock_ops_vcpu_is_preempted; - goto patch_site; - } - goto patch_default; -#endif + case PARAVIRT_PATCH(pv_lock_ops.vcpu_is_preempted): + if (pv_is_native_vcpu_is_preempted()) { + start = start_pv_lock_ops_vcpu_is_preempted; + end = end_pv_lock_ops_vcpu_is_preempte...

..., unsigned len) > @@ -54,6 +56,12 @@ unsigned native_patch(u8 type, u16 clobb > end = end_pv_lock_ops_queued_spin_unlock; > goto patch_site; > } > + case PARAVIRT_PATCH(pv_lock_ops.vcpu_is_preempted): > + if (pv_is_native_vcpu_is_preempted()) { > + start = start_pv_lock_ops_vcpu_is_preempted; > + end = end_pv_lock_ops_vcpu_is_preempted; > + goto patch_site; > + } > #endif > > default: > --- a/arch/x86/kernel/paravirt_patch_64.c > +++ b/arch/x86/kernel/paravirt_patch_64.c > @@ -20,6 +20,7 @@ DEF_NATIVE(, mov64, "mov %rdi, %rax"); > &g...

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

change from v6: fix typos and remove uncessary comments. change from v5: spilt x86/kvm patch into guest/host part. introduce kvm_write_guest_offset_cached. fix some typos. rebase patch onto 4.9.2 change from v4: spilt x86 kvm vcpu preempted check into two patches. add documentation patch. add x86 vcpu preempted check patch under xen add s390 vcpu preempted check patch change from v3:

change from v6: fix typos and remove uncessary comments. change from v5: spilt x86/kvm patch into guest/host part. introduce kvm_write_guest_offset_cached. fix some typos. rebase patch onto 4.9.2 change from v4: spilt x86 kvm vcpu preempted check into two patches. add documentation patch. add x86 vcpu preempted check patch under xen add s390 vcpu preempted check patch change from v3:

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