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kvm: vmx: Allow disabling virtual NMI support 

To simplify testing of these rarely used code paths, add a module parameter
that turns it on.  One eventinj.flat test (NMI after iret) fails when
loading kvm_intel with vnmi=0.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Paolo Bonzini 2017-11-06 13:31:13 +01:00
parent 8a1b43922d
commit d02fcf5077
1 changed files with 21 additions and 10 deletions
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31
arch/x86/kvm/vmx.c
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@ -70,6 +70,9 @@ MODULE_DEVICE_TABLE(x86cpu, vmx_cpu_id);
static bool __read_mostly enable_vpid = 1;
module_param_named(vpid, enable_vpid, bool, 0444);
static bool __read_mostly enable_vnmi = 1;
module_param_named(vnmi, enable_vnmi, bool, S_IRUGO);
static bool __read_mostly flexpriority_enabled = 1;
module_param_named(flexpriority, flexpriority_enabled, bool, S_IRUGO);
@ -5236,6 +5239,10 @@ static u32 vmx_pin_based_exec_ctrl(struct vcpu_vmx *vmx)
if (!kvm_vcpu_apicv_active(&vmx->vcpu))
pin_based_exec_ctrl &= ~PIN_BASED_POSTED_INTR;
if (!enable_vnmi)
pin_based_exec_ctrl &= ~PIN_BASED_VIRTUAL_NMIS;
/* Enable the preemption timer dynamically */
pin_based_exec_ctrl &= ~PIN_BASED_VMX_PREEMPTION_TIMER;
return pin_based_exec_ctrl;
@ -5670,7 +5677,7 @@ static void enable_irq_window(struct kvm_vcpu *vcpu)
static void enable_nmi_window(struct kvm_vcpu *vcpu)
{
if (!cpu_has_virtual_nmis() ||
if (!enable_vnmi ||
vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_STI) {
enable_irq_window(vcpu);
return;
@ -5711,7 +5718,7 @@ static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
if (!cpu_has_virtual_nmis()) {
if (!enable_vnmi) {
/*
* Tracking the NMI-blocked state in software is built upon
* finding the next open IRQ window. This, in turn, depends on
@ -5742,7 +5749,7 @@ static bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu)
struct vcpu_vmx *vmx = to_vmx(vcpu);
bool masked;
if (!cpu_has_virtual_nmis())
if (!enable_vnmi)
return vmx->loaded_vmcs->soft_vnmi_blocked;
if (vmx->loaded_vmcs->nmi_known_unmasked)
return false;
@ -5755,7 +5762,7 @@ static void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
if (!cpu_has_virtual_nmis()) {
if (!enable_vnmi) {
if (vmx->loaded_vmcs->soft_vnmi_blocked != masked) {
vmx->loaded_vmcs->soft_vnmi_blocked = masked;
vmx->loaded_vmcs->vnmi_blocked_time = 0;
@ -5776,7 +5783,7 @@ static int vmx_nmi_allowed(struct kvm_vcpu *vcpu)
if (to_vmx(vcpu)->nested.nested_run_pending)
return 0;
if (!cpu_has_virtual_nmis() &&
if (!enable_vnmi &&
to_vmx(vcpu)->loaded_vmcs->soft_vnmi_blocked)
return 0;
@ -6507,7 +6514,7 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu)
* AAK134, BY25.
*/
if (!(to_vmx(vcpu)->idt_vectoring_info & VECTORING_INFO_VALID_MASK) &&
cpu_has_virtual_nmis() &&
enable_vnmi &&
(exit_qualification & INTR_INFO_UNBLOCK_NMI))
vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, GUEST_INTR_STATE_NMI);
@ -6567,6 +6574,7 @@ static int handle_ept_misconfig(struct kvm_vcpu *vcpu)
static int handle_nmi_window(struct kvm_vcpu *vcpu)
{
WARN_ON_ONCE(!enable_vnmi);
vmcs_clear_bits(CPU_BASED_VM_EXEC_CONTROL,
CPU_BASED_VIRTUAL_NMI_PENDING);
++vcpu->stat.nmi_window_exits;
@ -6790,6 +6798,9 @@ static __init int hardware_setup(void)
if (!cpu_has_vmx_flexpriority())
flexpriority_enabled = 0;
if (!cpu_has_virtual_nmis())
enable_vnmi = 0;
/*
* set_apic_access_page_addr() is used to reload apic access
* page upon invalidation. No need to do anything if not
@ -8011,7 +8022,7 @@ static int handle_pml_full(struct kvm_vcpu *vcpu)
* "blocked by NMI" bit has to be set before next VM entry.
*/
if (!(to_vmx(vcpu)->idt_vectoring_info & VECTORING_INFO_VALID_MASK) &&
cpu_has_virtual_nmis() &&
enable_vnmi &&
(exit_qualification & INTR_INFO_UNBLOCK_NMI))
vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
GUEST_INTR_STATE_NMI);
@ -8856,7 +8867,7 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu)
return 0;
}
if (unlikely(!cpu_has_virtual_nmis() &&
if (unlikely(!enable_vnmi &&
vmx->loaded_vmcs->soft_vnmi_blocked)) {
if (vmx_interrupt_allowed(vcpu)) {
vmx->loaded_vmcs->soft_vnmi_blocked = 0;
@ -9157,7 +9168,7 @@ static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx)
idtv_info_valid = vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK;
if (cpu_has_virtual_nmis()) {
if (enable_vnmi) {
if (vmx->loaded_vmcs->nmi_known_unmasked)
return;
/*
@ -9306,7 +9317,7 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
unsigned long debugctlmsr, cr3, cr4;
/* Record the guest's net vcpu time for enforced NMI injections. */
if (unlikely(!cpu_has_virtual_nmis() &&
if (unlikely(!enable_vnmi &&
vmx->loaded_vmcs->soft_vnmi_blocked))
vmx->loaded_vmcs->entry_time = ktime_get();