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KVM: x86: prevent setup of invalid routes

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The check in kvm_set_pic_irq() and kvm_set_ioapic_irq() was just a
temporary measure until the code improved enough for us to do this.

This changes APIC in a case when KVM_SET_GSI_ROUTING is called to set up pic
and ioapic routes before KVM_CREATE_IRQCHIP.  Those rules would get overwritten
by KVM_CREATE_IRQCHIP at best, so it is pointless to allow it.  Userspaces
hopefully noticed that things don't work if they do that and don't do that.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Radim Krčmář 2016-12-16 16:10:05 +01:00
parent e5dc48777d
commit 8231f50d98
1 changed files with 6 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
arch/x86/kvm/irq_comm.c
View File

@ -41,15 +41,6 @@ static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
bool line_status)
{
struct kvm_pic *pic = pic_irqchip(kvm);
/*
* XXX: rejecting pic routes when pic isn't in use would be better,
* but the default routing table is installed while kvm->arch.vpic is
* NULL and KVM_CREATE_IRQCHIP can race with KVM_IRQ_LINE.
*/
if (!pic)
return -1;
return kvm_pic_set_irq(pic, e->irqchip.pin, irq_source_id, level);
}
@ -58,10 +49,6 @@ static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
bool line_status)
{
struct kvm_ioapic *ioapic = kvm->arch.vioapic;
if (!ioapic)
return -1;
return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, irq_source_id, level,
line_status);
}
@ -301,10 +288,16 @@ int kvm_set_routing_entry(struct kvm *kvm,
delta = 8;
/* fall through */
case KVM_IRQCHIP_PIC_MASTER:
if (!pic_in_kernel(kvm))
goto out;
e->set = kvm_set_pic_irq;
max_pin = PIC_NUM_PINS;
break;
case KVM_IRQCHIP_IOAPIC:
if (!ioapic_in_kernel(kvm))
goto out;
max_pin = KVM_IOAPIC_NUM_PINS;
e->set = kvm_set_ioapic_irq;
break;