| Message ID | 20200914091148.95654-2-lihaiwei.kernel@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Fix the allocation of pv cpu mask | expand |
On 14/09/20 11:11, lihaiwei.kernel@gmail.com wrote: > From: Haiwei Li <lihaiwei@tencent.com> > > When CONFIG_SMP is not set, an build error occurs with message "error: > use of undeclared identifier 'kvm_send_ipi_mask_allbutself'" > > Fixes: 0f990222108d ("KVM: Check the allocation of pv cpu mask", 2020-09-01) > Reported-by: kernel test robot <lkp@intel.com> > Signed-off-by: Haiwei Li <lihaiwei@tencent.com> > --- > arch/x86/kernel/kvm.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c > index 1b51b727b140..7e8be0421720 100644 > --- a/arch/x86/kernel/kvm.c > +++ b/arch/x86/kernel/kvm.c > @@ -797,7 +797,9 @@ static __init int kvm_alloc_cpumask(void) > } > } > > +#if defined(CONFIG_SMP) > apic->send_IPI_mask_allbutself = kvm_send_ipi_mask_allbutself; > +#endif > pv_ops.mmu.flush_tlb_others = kvm_flush_tlb_others; > return 0; > > If CONFIG_SMP is not set you don't need kvm_alloc_cpumask or pv_ops.mmu.flush_tlb_others at all. Can you squash these two into the original patch and re-submit for 5.10? Paolo
On 20/9/20 21:09, Paolo Bonzini wrote: > On 14/09/20 11:11, lihaiwei.kernel@gmail.com wrote: >> From: Haiwei Li <lihaiwei@tencent.com> >> >> When CONFIG_SMP is not set, an build error occurs with message "error: >> use of undeclared identifier 'kvm_send_ipi_mask_allbutself'" >> >> Fixes: 0f990222108d ("KVM: Check the allocation of pv cpu mask", 2020-09-01) >> Reported-by: kernel test robot <lkp@intel.com> >> Signed-off-by: Haiwei Li <lihaiwei@tencent.com> >> --- >> arch/x86/kernel/kvm.c | 2 ++ >> 1 file changed, 2 insertions(+) >> >> diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c >> index 1b51b727b140..7e8be0421720 100644 >> --- a/arch/x86/kernel/kvm.c >> +++ b/arch/x86/kernel/kvm.c >> @@ -797,7 +797,9 @@ static __init int kvm_alloc_cpumask(void) >> } >> } >> >> +#if defined(CONFIG_SMP) >> apic->send_IPI_mask_allbutself = kvm_send_ipi_mask_allbutself; >> +#endif >> pv_ops.mmu.flush_tlb_others = kvm_flush_tlb_others; >> return 0; >> >> > > If CONFIG_SMP is not set you don't need kvm_alloc_cpumask or > pv_ops.mmu.flush_tlb_others at all. Can you squash these two into the > original patch and re-submit for 5.10? I will, thanks. Haiwei Li
On 20/9/20 21:09, Paolo Bonzini wrote: > On 14/09/20 11:11, lihaiwei.kernel@gmail.com wrote: >> From: Haiwei Li <lihaiwei@tencent.com> >> >> When CONFIG_SMP is not set, an build error occurs with message "error: >> use of undeclared identifier 'kvm_send_ipi_mask_allbutself'" >> >> Fixes: 0f990222108d ("KVM: Check the allocation of pv cpu mask", 2020-09-01) >> Reported-by: kernel test robot <lkp@intel.com> >> Signed-off-by: Haiwei Li <lihaiwei@tencent.com> >> --- >> arch/x86/kernel/kvm.c | 2 ++ >> 1 file changed, 2 insertions(+) >> >> diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c >> index 1b51b727b140..7e8be0421720 100644 >> --- a/arch/x86/kernel/kvm.c >> +++ b/arch/x86/kernel/kvm.c >> @@ -797,7 +797,9 @@ static __init int kvm_alloc_cpumask(void) >> } >> } >> >> +#if defined(CONFIG_SMP) >> apic->send_IPI_mask_allbutself = kvm_send_ipi_mask_allbutself; >> +#endif >> pv_ops.mmu.flush_tlb_others = kvm_flush_tlb_others; >> return 0; >> >> > > If CONFIG_SMP is not set you don't need kvm_alloc_cpumask or > pv_ops.mmu.flush_tlb_others at all. Can you squash these two into the > original patch and re-submit for 5.10? Hi, Paolo I'm a little confused. Function kvm_flush_tlb_others doesn't seem to be related to CONFIG_SMP. And my patch like: --- arch/x86/kernel/kvm.c | 27 ++++++++++++++++++++++++--- 1 file changed, 24 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 9663ba31347c..1e5da6db519c 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -553,7 +553,6 @@ static void kvm_send_ipi_mask_allbutself(const struct cpumask *mask, int vector) static void kvm_setup_pv_ipi(void) { apic->send_IPI_mask = kvm_send_ipi_mask; - apic->send_IPI_mask_allbutself = kvm_send_ipi_mask_allbutself; pr_info("setup PV IPIs\n"); } @@ -619,6 +618,11 @@ static void kvm_flush_tlb_others(const struct cpumask *cpumask, struct kvm_steal_time *src; struct cpumask *flushmask = this_cpu_cpumask_var_ptr(__pv_cpu_mask); + if (unlikely(!flushmask)) { + native_flush_tlb_others(cpumask, info); + return; + } + cpumask_copy(flushmask, cpumask); /* * We have to call flush only on online vCPUs. And @@ -765,6 +769,14 @@ static __init int activate_jump_labels(void) } arch_initcall(activate_jump_labels); +static void kvm_free_cpumask(void) +{ + unsigned int cpu; + + for_each_possible_cpu(cpu) + free_cpumask_var(per_cpu(__pv_cpu_mask, cpu)); +} + static __init int kvm_alloc_cpumask(void) { int cpu; @@ -783,11 +795,20 @@ static __init int kvm_alloc_cpumask(void) if (alloc) for_each_possible_cpu(cpu) { - zalloc_cpumask_var_node(per_cpu_ptr(&__pv_cpu_mask, cpu), - GFP_KERNEL, cpu_to_node(cpu)); + if (!zalloc_cpumask_var_node( + per_cpu_ptr(&__pv_cpu_mask, cpu), + GFP_KERNEL, cpu_to_node(cpu))) + goto zalloc_cpumask_fail; } +#if defined(CONFIG_SMP) + apic->send_IPI_mask_allbutself = kvm_send_ipi_mask_allbutself; +#endif return 0; + +zalloc_cpumask_fail: + kvm_free_cpumask(); + return -ENOMEM; } arch_initcall(kvm_alloc_cpumask); -- 2.18.4 Do you have any suggestion? Thanks. Haiwei
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 1b51b727b140..7e8be0421720 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -797,7 +797,9 @@ static __init int kvm_alloc_cpumask(void) } } +#if defined(CONFIG_SMP) apic->send_IPI_mask_allbutself = kvm_send_ipi_mask_allbutself; +#endif pv_ops.mmu.flush_tlb_others = kvm_flush_tlb_others; return 0;