| Message ID | 20221130230934.1014142-13-seanjc@google.com |
|---|---|
| State | Accepted |
| Headers | show |
| Series | KVM: Rework kvm_init() and hardware enabling | expand |
Sean Christopherson <seanjc@google.com> writes: > Move Hyper-V's eVMCS initialization to a dedicated helper to clean up > vmx_init(), and add a comment to call out that the Hyper-V init code > doesn't need to be unwound if vmx_init() ultimately fails. > > No functional change intended. > > Signed-off-by: Sean Christopherson <seanjc@google.com> > --- > arch/x86/kvm/vmx/vmx.c | 73 +++++++++++++++++++++++++----------------- > 1 file changed, 43 insertions(+), 30 deletions(-) > > diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c > index c0de7160700b..b8bf95b9710d 100644 > --- a/arch/x86/kvm/vmx/vmx.c > +++ b/arch/x86/kvm/vmx/vmx.c > @@ -523,6 +523,8 @@ static inline void vmx_segment_cache_clear(struct vcpu_vmx *vmx) > static unsigned long host_idt_base; > > #if IS_ENABLED(CONFIG_HYPERV) > +static struct kvm_x86_ops vmx_x86_ops __initdata; > + > static bool __read_mostly enlightened_vmcs = true; > module_param(enlightened_vmcs, bool, 0444); > > @@ -551,6 +553,43 @@ static int hv_enable_l2_tlb_flush(struct kvm_vcpu *vcpu) > return 0; > } > > +static __init void hv_init_evmcs(void) > +{ > + int cpu; > + > + if (!enlightened_vmcs) > + return; > + > + /* > + * Enlightened VMCS usage should be recommended and the host needs > + * to support eVMCS v1 or above. > + */ > + if (ms_hyperv.hints & HV_X64_ENLIGHTENED_VMCS_RECOMMENDED && > + (ms_hyperv.nested_features & HV_X64_ENLIGHTENED_VMCS_VERSION) >= > + KVM_EVMCS_VERSION) { > + > + /* Check that we have assist pages on all online CPUs */ > + for_each_online_cpu(cpu) { > + if (!hv_get_vp_assist_page(cpu)) { > + enlightened_vmcs = false; > + break; > + } > + } > + > + if (enlightened_vmcs) { > + pr_info("KVM: vmx: using Hyper-V Enlightened VMCS\n"); > + static_branch_enable(&enable_evmcs); > + } > + > + if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) > + vmx_x86_ops.enable_l2_tlb_flush > + = hv_enable_l2_tlb_flush; > + > + } else { > + enlightened_vmcs = false; > + } > +} > + > static void hv_reset_evmcs(void) > { > struct hv_vp_assist_page *vp_ap; > @@ -577,6 +616,7 @@ static void hv_reset_evmcs(void) > } > > #else /* IS_ENABLED(CONFIG_HYPERV) */ > +static void hv_init_evmcs(void) {} > static void hv_reset_evmcs(void) {} > #endif /* IS_ENABLED(CONFIG_HYPERV) */ > > @@ -8500,38 +8540,11 @@ static int __init vmx_init(void) > { > int r, cpu; > > -#if IS_ENABLED(CONFIG_HYPERV) > /* > - * Enlightened VMCS usage should be recommended and the host needs > - * to support eVMCS v1 or above. We can also disable eVMCS support > - * with module parameter. > + * Note, hv_init_evmcs() touches only VMX knobs, i.e. there's nothing > + * to unwind if a later step fails. > */ > - if (enlightened_vmcs && > - ms_hyperv.hints & HV_X64_ENLIGHTENED_VMCS_RECOMMENDED && > - (ms_hyperv.nested_features & HV_X64_ENLIGHTENED_VMCS_VERSION) >= > - KVM_EVMCS_VERSION) { > - > - /* Check that we have assist pages on all online CPUs */ > - for_each_online_cpu(cpu) { > - if (!hv_get_vp_assist_page(cpu)) { > - enlightened_vmcs = false; > - break; > - } > - } > - > - if (enlightened_vmcs) { > - pr_info("KVM: vmx: using Hyper-V Enlightened VMCS\n"); > - static_branch_enable(&enable_evmcs); > - } > - > - if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) > - vmx_x86_ops.enable_l2_tlb_flush > - = hv_enable_l2_tlb_flush; > - > - } else { > - enlightened_vmcs = false; > - } > -#endif > + hv_init_evmcs(); > > r = kvm_init(&vmx_init_ops, sizeof(struct vcpu_vmx), > __alignof__(struct vcpu_vmx), THIS_MODULE); Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index c0de7160700b..b8bf95b9710d 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -523,6 +523,8 @@ static inline void vmx_segment_cache_clear(struct vcpu_vmx *vmx) static unsigned long host_idt_base; #if IS_ENABLED(CONFIG_HYPERV) +static struct kvm_x86_ops vmx_x86_ops __initdata; + static bool __read_mostly enlightened_vmcs = true; module_param(enlightened_vmcs, bool, 0444); @@ -551,6 +553,43 @@ static int hv_enable_l2_tlb_flush(struct kvm_vcpu *vcpu) return 0; } +static __init void hv_init_evmcs(void) +{ + int cpu; + + if (!enlightened_vmcs) + return; + + /* + * Enlightened VMCS usage should be recommended and the host needs + * to support eVMCS v1 or above. + */ + if (ms_hyperv.hints & HV_X64_ENLIGHTENED_VMCS_RECOMMENDED && + (ms_hyperv.nested_features & HV_X64_ENLIGHTENED_VMCS_VERSION) >= + KVM_EVMCS_VERSION) { + + /* Check that we have assist pages on all online CPUs */ + for_each_online_cpu(cpu) { + if (!hv_get_vp_assist_page(cpu)) { + enlightened_vmcs = false; + break; + } + } + + if (enlightened_vmcs) { + pr_info("KVM: vmx: using Hyper-V Enlightened VMCS\n"); + static_branch_enable(&enable_evmcs); + } + + if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) + vmx_x86_ops.enable_l2_tlb_flush + = hv_enable_l2_tlb_flush; + + } else { + enlightened_vmcs = false; + } +} + static void hv_reset_evmcs(void) { struct hv_vp_assist_page *vp_ap; @@ -577,6 +616,7 @@ static void hv_reset_evmcs(void) } #else /* IS_ENABLED(CONFIG_HYPERV) */ +static void hv_init_evmcs(void) {} static void hv_reset_evmcs(void) {} #endif /* IS_ENABLED(CONFIG_HYPERV) */ @@ -8500,38 +8540,11 @@ static int __init vmx_init(void) { int r, cpu; -#if IS_ENABLED(CONFIG_HYPERV) /* - * Enlightened VMCS usage should be recommended and the host needs - * to support eVMCS v1 or above. We can also disable eVMCS support - * with module parameter. + * Note, hv_init_evmcs() touches only VMX knobs, i.e. there's nothing + * to unwind if a later step fails. */ - if (enlightened_vmcs && - ms_hyperv.hints & HV_X64_ENLIGHTENED_VMCS_RECOMMENDED && - (ms_hyperv.nested_features & HV_X64_ENLIGHTENED_VMCS_VERSION) >= - KVM_EVMCS_VERSION) { - - /* Check that we have assist pages on all online CPUs */ - for_each_online_cpu(cpu) { - if (!hv_get_vp_assist_page(cpu)) { - enlightened_vmcs = false; - break; - } - } - - if (enlightened_vmcs) { - pr_info("KVM: vmx: using Hyper-V Enlightened VMCS\n"); - static_branch_enable(&enable_evmcs); - } - - if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) - vmx_x86_ops.enable_l2_tlb_flush - = hv_enable_l2_tlb_flush; - - } else { - enlightened_vmcs = false; - } -#endif + hv_init_evmcs(); r = kvm_init(&vmx_init_ops, sizeof(struct vcpu_vmx), __alignof__(struct vcpu_vmx), THIS_MODULE);
Move Hyper-V's eVMCS initialization to a dedicated helper to clean up vmx_init(), and add a comment to call out that the Hyper-V init code doesn't need to be unwound if vmx_init() ultimately fails. No functional change intended. Signed-off-by: Sean Christopherson <seanjc@google.com> --- arch/x86/kvm/vmx/vmx.c | 73 +++++++++++++++++++++++++----------------- 1 file changed, 43 insertions(+), 30 deletions(-)