From b2869f28e1476cd705bb28c58fd01b0bd661bb99 Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Fri, 25 Jan 2019 12:23:17 -0600 Subject: [PATCH] KVM: x86: Mark expected switch fall-throughs In preparation to enabling -Wimplicit-fallthrough, mark switch cases where we are expecting to fall through. This patch fixes the following warnings: arch/x86/kvm/lapic.c:1037:27: warning: this statement may fall through [-Wimplicit-fallthrough=] arch/x86/kvm/lapic.c:1876:3: warning: this statement may fall through [-Wimplicit-fallthrough=] arch/x86/kvm/hyperv.c:1637:6: warning: this statement may fall through [-Wimplicit-fallthrough=] arch/x86/kvm/svm.c:4396:6: warning: this statement may fall through [-Wimplicit-fallthrough=] arch/x86/kvm/mmu.c:4372:36: warning: this statement may fall through [-Wimplicit-fallthrough=] arch/x86/kvm/x86.c:3835:6: warning: this statement may fall through [-Wimplicit-fallthrough=] arch/x86/kvm/x86.c:7938:23: warning: this statement may fall through [-Wimplicit-fallthrough=] arch/x86/kvm/vmx/vmx.c:2015:6: warning: this statement may fall through [-Wimplicit-fallthrough=] arch/x86/kvm/vmx/vmx.c:1773:6: warning: this statement may fall through [-Wimplicit-fallthrough=] Warning level 3 was used: -Wimplicit-fallthrough=3 This patch is part of the ongoing efforts to enabling -Wimplicit-fallthrough. Signed-off-by: Gustavo A. R. Silva Signed-off-by: Paolo Bonzini --- arch/x86/kvm/hyperv.c | 2 +- arch/x86/kvm/lapic.c | 2 ++ arch/x86/kvm/mmu.c | 1 + arch/x86/kvm/svm.c | 2 +- arch/x86/kvm/vmx/vmx.c | 4 ++-- arch/x86/kvm/x86.c | 3 +++ 6 files changed, 10 insertions(+), 4 deletions(-) diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index 4730fcaa70cf..89d20ed1d2e8 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -1636,7 +1636,7 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu) ret = kvm_hvcall_signal_event(vcpu, fast, ingpa); if (ret != HV_STATUS_INVALID_PORT_ID) break; - /* maybe userspace knows this conn_id: fall through */ + /* fall through - maybe userspace knows this conn_id. */ case HVCALL_POST_MESSAGE: /* don't bother userspace if it has no way to handle it */ if (unlikely(rep || !vcpu_to_synic(vcpu)->active)) { diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 9f089e2e09d0..4b6c2da7265c 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -1035,6 +1035,7 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode, switch (delivery_mode) { case APIC_DM_LOWEST: vcpu->arch.apic_arb_prio++; + /* fall through */ case APIC_DM_FIXED: if (unlikely(trig_mode && !level)) break; @@ -1874,6 +1875,7 @@ int kvm_lapic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val) case APIC_LVT0: apic_manage_nmi_watchdog(apic, val); + /* fall through */ case APIC_LVTTHMR: case APIC_LVTPC: case APIC_LVT1: diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index ce770b446238..da9c42349b1f 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -4371,6 +4371,7 @@ __reset_rsvds_bits_mask(struct kvm_vcpu *vcpu, rsvd_bits(maxphyaddr, 51); rsvd_check->rsvd_bits_mask[1][4] = rsvd_check->rsvd_bits_mask[0][4]; + /* fall through */ case PT64_ROOT_4LEVEL: rsvd_check->rsvd_bits_mask[0][3] = exb_bit_rsvd | nonleaf_bit8_rsvd | rsvd_bits(7, 7) | diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 9caf1252c64a..f13a3a24d360 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -4403,7 +4403,7 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr) case MSR_IA32_APICBASE: if (kvm_vcpu_apicv_active(vcpu)) avic_update_vapic_bar(to_svm(vcpu), data); - /* Follow through */ + /* Fall through */ default: return kvm_set_msr_common(vcpu, msr); } diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 99c898523c5e..4341175339f3 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -1773,7 +1773,7 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) if (!msr_info->host_initiated && !guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP)) return 1; - /* Otherwise falls through */ + /* Else, falls through */ default: msr = find_msr_entry(vmx, msr_info->index); if (msr) { @@ -2014,7 +2014,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) /* Check reserved bit, higher 32 bits should be zero */ if ((data >> 32) != 0) return 1; - /* Otherwise falls through */ + /* Else, falls through */ default: msr = find_msr_entry(vmx, msr_index); if (msr) { diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index d21dcad397e4..3d27206f6c01 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3834,6 +3834,8 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, case KVM_CAP_HYPERV_SYNIC2: if (cap->args[0]) return -EINVAL; + /* fall through */ + case KVM_CAP_HYPERV_SYNIC: if (!irqchip_in_kernel(vcpu->kvm)) return -EINVAL; @@ -7936,6 +7938,7 @@ static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu) vcpu->arch.pv.pv_unhalted = false; vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; + /* fall through */ case KVM_MP_STATE_RUNNABLE: vcpu->arch.apf.halted = false; break; -- GitLab