From: Haiwei Li lihaiwei@tencent.com
[ Upstream commit 0f990222108d214a0924d920e6095b58107d7b59 ]
check the allocation of per-cpu __pv_cpu_mask. Initialize ops only when successful.
Signed-off-by: Haiwei Li lihaiwei@tencent.com Message-Id: d59f05df-e6d3-3d31-a036-cc25a2b2f33f@gmail.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/kernel/kvm.c | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index df63786e7bfa4..d6219f3181d63 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -638,7 +638,6 @@ static void __init kvm_guest_init(void) }
if (pv_tlb_flush_supported()) { - pv_ops.mmu.flush_tlb_others = kvm_flush_tlb_others; pv_ops.mmu.tlb_remove_table = tlb_remove_table; pr_info("KVM setup pv remote TLB flush\n"); } @@ -750,6 +749,14 @@ static __init int activate_jump_labels(void) } arch_initcall(activate_jump_labels);
+static void kvm_free_pv_cpu_mask(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; @@ -768,11 +775,20 @@ 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; + } }
+ apic->send_IPI_mask_allbutself = kvm_send_ipi_mask_allbutself; + pv_ops.mmu.flush_tlb_others = kvm_flush_tlb_others; return 0; + +zalloc_cpumask_fail: + kvm_free_pv_cpu_mask(); + return -ENOMEM; } arch_initcall(kvm_alloc_cpumask);