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KVM: x86: Remove return code from enable_irq/nmi_window 

It's no longer possible to enter enable_irq_window in guest mode when
L1 intercepts external interrupts and we are entering L2. This is now
caught in vcpu_enter_guest. So we can remove the check from the VMX
version of enable_irq_window, thus the need to return an error code from
both enable_irq_window and enable_nmi_window.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jan Kiszka 2014-03-07 20:03:15 +01:00 committed by Paolo Bonzini
parent 220c567297
commit c9a7953f09
4 changed files with 14 additions and 29 deletions
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4
arch/x86/include/asm/kvm_host.h
View File

@ -729,8 +729,8 @@ struct kvm_x86_ops {
int (*nmi_allowed)(struct kvm_vcpu *vcpu);
bool (*get_nmi_mask)(struct kvm_vcpu *vcpu);
void (*set_nmi_mask)(struct kvm_vcpu *vcpu, bool masked);
int (*enable_nmi_window)(struct kvm_vcpu *vcpu);
int (*enable_irq_window)(struct kvm_vcpu *vcpu);
void (*enable_nmi_window)(struct kvm_vcpu *vcpu);
void (*enable_irq_window)(struct kvm_vcpu *vcpu);
void (*update_cr8_intercept)(struct kvm_vcpu *vcpu, int tpr, int irr);
int (*vm_has_apicv)(struct kvm *kvm);
void (*hwapic_irr_update)(struct kvm_vcpu *vcpu, int max_irr);

8
arch/x86/kvm/svm.c
View File

@ -3650,7 +3650,7 @@ static int svm_interrupt_allowed(struct kvm_vcpu *vcpu)
return ret;
}
static int enable_irq_window(struct kvm_vcpu *vcpu)
static void enable_irq_window(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
@ -3664,16 +3664,15 @@ static int enable_irq_window(struct kvm_vcpu *vcpu)
svm_set_vintr(svm);
svm_inject_irq(svm, 0x0);
}
return 0;
}
static int enable_nmi_window(struct kvm_vcpu *vcpu)
static void enable_nmi_window(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
if ((svm->vcpu.arch.hflags & (HF_NMI_MASK | HF_IRET_MASK))
== HF_NMI_MASK)
return 0; /* IRET will cause a vm exit */
return; /* IRET will cause a vm exit */
/*
* Something prevents NMI from been injected. Single step over possible
@ -3682,7 +3681,6 @@ static int enable_nmi_window(struct kvm_vcpu *vcpu)
svm->nmi_singlestep = true;
svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);
update_db_bp_intercept(vcpu);
return 0;
}
static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr)

25
arch/x86/kvm/vmx.c
View File

@ -4514,39 +4514,28 @@ static bool nested_exit_on_nmi(struct kvm_vcpu *vcpu)
PIN_BASED_NMI_EXITING;
}
static int enable_irq_window(struct kvm_vcpu *vcpu)
static void enable_irq_window(struct kvm_vcpu *vcpu)
{
u32 cpu_based_vm_exec_control;
if (is_guest_mode(vcpu) && nested_exit_on_intr(vcpu))
/*
* We get here if vmx_interrupt_allowed() said we can't
* inject to L1 now because L2 must run. The caller will have
* to make L2 exit right after entry, so we can inject to L1
* more promptly.
*/
return -EBUSY;
cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
return 0;
}
static int enable_nmi_window(struct kvm_vcpu *vcpu)
static void enable_nmi_window(struct kvm_vcpu *vcpu)
{
u32 cpu_based_vm_exec_control;
if (!cpu_has_virtual_nmis())
return enable_irq_window(vcpu);
if (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_STI)
return enable_irq_window(vcpu);
if (!cpu_has_virtual_nmis() ||
vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_STI) {
enable_irq_window(vcpu);
return;
}
cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_NMI_PENDING;
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
return 0;
}
static void vmx_inject_irq(struct kvm_vcpu *vcpu)

6
arch/x86/kvm/x86.c
View File

@ -5976,11 +5976,9 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
req_immediate_exit = true;
/* enable NMI/IRQ window open exits if needed */
else if (vcpu->arch.nmi_pending)
req_immediate_exit =
kvm_x86_ops->enable_nmi_window(vcpu) != 0;
kvm_x86_ops->enable_nmi_window(vcpu);
else if (kvm_cpu_has_injectable_intr(vcpu) || req_int_win)
req_immediate_exit =
kvm_x86_ops->enable_irq_window(vcpu) != 0;
kvm_x86_ops->enable_irq_window(vcpu);
if (kvm_lapic_enabled(vcpu)) {
/*