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KVM: nVMX: handle nested posted interrupts when apicv is disabled for L1

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commit 91a5f413af596ad01097e59bf487eb07cb3f1331 upstream.

Even when APICv is disabled for L1 it can (and, actually, is) still
available for L2, this means we need to always call
vmx_deliver_nested_posted_interrupt() when attempting an interrupt
delivery.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov 2020-02-20 18:22:05 +01:00 committed by Greg Kroah-Hartman
parent 9effa0ed19
commit e6bff0cdf5
4 changed files with 17 additions and 10 deletions
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2
arch/x86/include/asm/kvm_host.h
View File

@ -1006,7 +1006,7 @@ struct kvm_x86_ops {
void (*load_eoi_exitmap)(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap);
void (*set_virtual_apic_mode)(struct kvm_vcpu *vcpu);
void (*set_apic_access_page_addr)(struct kvm_vcpu *vcpu, hpa_t hpa);
void (*deliver_posted_interrupt)(struct kvm_vcpu *vcpu, int vector);
int (*deliver_posted_interrupt)(struct kvm_vcpu *vcpu, int vector);
int (*sync_pir_to_irr)(struct kvm_vcpu *vcpu);
int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
int (*get_tdp_level)(struct kvm_vcpu *vcpu);

5
arch/x86/kvm/lapic.c
View File

@ -993,11 +993,8 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
apic_clear_vector(vector, apic->regs + APIC_TMR);
}
if (vcpu->arch.apicv_active)
kvm_x86_ops->deliver_posted_interrupt(vcpu, vector);
else {
if (kvm_x86_ops->deliver_posted_interrupt(vcpu, vector)) {
kvm_lapic_set_irr(vector, apic);
kvm_make_request(KVM_REQ_EVENT, vcpu);
kvm_vcpu_kick(vcpu);
}

7
arch/x86/kvm/svm.c
View File

@ -4631,8 +4631,11 @@ static void svm_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
return;
}
static void svm_deliver_avic_intr(struct kvm_vcpu *vcpu, int vec)
static int svm_deliver_avic_intr(struct kvm_vcpu *vcpu, int vec)
{
if (!vcpu->arch.apicv_active)
return -1;
kvm_lapic_set_irr(vec, vcpu->arch.apic);
smp_mb__after_atomic();
@ -4641,6 +4644,8 @@ static void svm_deliver_avic_intr(struct kvm_vcpu *vcpu, int vec)
kvm_cpu_get_apicid(vcpu->cpu));
else
kvm_vcpu_wake_up(vcpu);
return 0;
}
static bool svm_dy_apicv_has_pending_interrupt(struct kvm_vcpu *vcpu)

13
arch/x86/kvm/vmx.c
View File

@ -5541,24 +5541,29 @@ static int vmx_deliver_nested_posted_interrupt(struct kvm_vcpu *vcpu,
* 2. If target vcpu isn't running(root mode), kick it to pick up the
* interrupt from PIR in next vmentry.
*/
static void vmx_deliver_posted_interrupt(struct kvm_vcpu *vcpu, int vector)
static int vmx_deliver_posted_interrupt(struct kvm_vcpu *vcpu, int vector)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
int r;
r = vmx_deliver_nested_posted_interrupt(vcpu, vector);
if (!r)
return;
return 0;
if (!vcpu->arch.apicv_active)
return -1;
if (pi_test_and_set_pir(vector, &vmx->pi_desc))
return;
return 0;
/* If a previous notification has sent the IPI, nothing to do. */
if (pi_test_and_set_on(&vmx->pi_desc))
return;
return 0;
if (!kvm_vcpu_trigger_posted_interrupt(vcpu, false))
kvm_vcpu_kick(vcpu);
return 0;
}
/*