We can easily route hardware interrupts directly into VM context when
they target the "Fixed" or "LowPriority" delivery modes.
However, on modes such as "SMI" or "Init", we need to go via KVM code
to actually put the vCPU into a different mode of operation, so we can
not post the interrupt
Add code in the VMX and SVM PI logic to explicitly refuse to establish
posted mappings for advanced IRQ deliver modes. This reflects the logic
in __apic_accept_irq() which also only ever passes Fixed and LowPriority
interrupts as posted interrupts into the guest.
This fixes a bug I have with code which configures real hardware to
inject virtual SMIs into my guest.
Signed-off-by: Alexander Graf <[email protected]>
Reviewed-by: Liran Alon <[email protected]>
Reviewed-by: Sean Christopherson <[email protected]>
Reviewed-by: Wanpeng Li <[email protected]>
Cc: [email protected]
Signed-off-by: Paolo Bonzini <[email protected]>
void kvm_set_msi_irq(struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e,
struct kvm_lapic_irq *irq);
+static inline bool kvm_irq_is_postable(struct kvm_lapic_irq *irq)
+{
+ /* We can only post Fixed and LowPrio IRQs */
+ return (irq->delivery_mode == dest_Fixed ||
+ irq->delivery_mode == dest_LowestPrio);
+}
+
static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
{
if (kvm_x86_ops->vcpu_blocking)
kvm_set_msi_irq(kvm, e, &irq);
- if (!kvm_intr_is_single_vcpu(kvm, &irq, &vcpu)) {
+ if (!kvm_intr_is_single_vcpu(kvm, &irq, &vcpu) ||
+ !kvm_irq_is_postable(&irq)) {
pr_debug("SVM: %s: use legacy intr remap mode for irq %u\n",
__func__, irq.vector);
return -1;
* 1. When cannot target interrupt to a specific vcpu.
* 2. Unsetting posted interrupt.
* 3. APIC virtialization is disabled for the vcpu.
+ * 4. IRQ has incompatible delivery mode (SMI, INIT, etc)
*/
if (!get_pi_vcpu_info(kvm, e, &vcpu_info, &svm) && set &&
kvm_vcpu_apicv_active(&svm->vcpu)) {
* irqbalance to make the interrupts single-CPU.
*
* We will support full lowest-priority interrupt later.
+ *
+ * In addition, we can only inject generic interrupts using
+ * the PI mechanism, refuse to route others through it.
*/
kvm_set_msi_irq(kvm, e, &irq);
- if (!kvm_intr_is_single_vcpu(kvm, &irq, &vcpu)) {
+ if (!kvm_intr_is_single_vcpu(kvm, &irq, &vcpu) ||
+ !kvm_irq_is_postable(&irq)) {
/*
* Make sure the IRTE is in remapped mode if
* we don't handle it in posted mode.