KVM: Use irq routing API for MSI
Merge MSI userspace interface with IRQ routing table. Notice the API have been
changed, and using IRQ routing table would be the only interface kvm-userspace
supported.
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 7aa5086..6bc7439 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -20,6 +20,11 @@
*/
#include <linux/kvm_host.h>
+
+#ifdef CONFIG_X86
+#include <asm/msidef.h>
+#endif
+
#include "irq.h"
#include "ioapic.h"
@@ -38,17 +43,70 @@
kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
}
+static void kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
+ struct kvm *kvm, int level)
+{
+ int vcpu_id;
+ struct kvm_vcpu *vcpu;
+ struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
+ int dest_id = (e->msi.address_lo & MSI_ADDR_DEST_ID_MASK)
+ >> MSI_ADDR_DEST_ID_SHIFT;
+ int vector = (e->msi.data & MSI_DATA_VECTOR_MASK)
+ >> MSI_DATA_VECTOR_SHIFT;
+ int dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
+ (unsigned long *)&e->msi.address_lo);
+ int trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
+ (unsigned long *)&e->msi.data);
+ int delivery_mode = test_bit(MSI_DATA_DELIVERY_MODE_SHIFT,
+ (unsigned long *)&e->msi.data);
+ u32 deliver_bitmask;
+
+ BUG_ON(!ioapic);
+
+ deliver_bitmask = kvm_ioapic_get_delivery_bitmask(ioapic,
+ dest_id, dest_mode);
+ /* IOAPIC delivery mode value is the same as MSI here */
+ switch (delivery_mode) {
+ case IOAPIC_LOWEST_PRIORITY:
+ vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm, vector,
+ deliver_bitmask);
+ if (vcpu != NULL)
+ kvm_apic_set_irq(vcpu, vector, trig_mode);
+ else
+ printk(KERN_INFO "kvm: null lowest priority vcpu!\n");
+ break;
+ case IOAPIC_FIXED:
+ for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
+ if (!(deliver_bitmask & (1 << vcpu_id)))
+ continue;
+ deliver_bitmask &= ~(1 << vcpu_id);
+ vcpu = ioapic->kvm->vcpus[vcpu_id];
+ if (vcpu)
+ kvm_apic_set_irq(vcpu, vector, trig_mode);
+ }
+ break;
+ default:
+ break;
+ }
+}
+
/* This should be called with the kvm->lock mutex held */
void kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
{
struct kvm_kernel_irq_routing_entry *e;
- unsigned long *irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
+ unsigned long *irq_state, sig_level;
- /* Logical OR for level trig interrupt */
- if (level)
- set_bit(irq_source_id, irq_state);
- else
- clear_bit(irq_source_id, irq_state);
+ if (irq < KVM_IOAPIC_NUM_PINS) {
+ irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
+
+ /* Logical OR for level trig interrupt */
+ if (level)
+ set_bit(irq_source_id, irq_state);
+ else
+ clear_bit(irq_source_id, irq_state);
+ sig_level = !!(*irq_state);
+ } else /* Deal with MSI/MSI-X */
+ sig_level = 1;
/* Not possible to detect if the guest uses the PIC or the
* IOAPIC. So set the bit in both. The guest will ignore
@@ -56,7 +114,7 @@
*/
list_for_each_entry(e, &kvm->irq_routing, link)
if (e->gsi == irq)
- e->set(e, kvm, !!(*irq_state));
+ e->set(e, kvm, sig_level);
}
void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
@@ -186,6 +244,12 @@
e->irqchip.irqchip = ue->u.irqchip.irqchip;
e->irqchip.pin = ue->u.irqchip.pin + delta;
break;
+ case KVM_IRQ_ROUTING_MSI:
+ e->set = kvm_set_msi;
+ e->msi.address_lo = ue->u.msi.address_lo;
+ e->msi.address_hi = ue->u.msi.address_hi;
+ e->msi.data = ue->u.msi.data;
+ break;
default:
goto out;
}