The function is used to dispatch MSI to lapic according to MSI message
address and message data.
(Any way to replace macro GET_VAL_FROM_SHIFT()?)
Signed-off-by: Sheng Yang <[EMAIL PROTECTED]>
---
virt/kvm/kvm_main.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 45 insertions(+), 0 deletions(-)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index ddfd7ac..be0f943 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -46,6 +46,7 @@
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
+#include <asm/msidef.h>
#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
#include "coalesced_mmio.h"
@@ -78,6 +79,50 @@ static long kvm_vcpu_ioctl(struct file *file, unsigned int
ioctl,
bool kvm_rebooting;
#ifdef KVM_CAP_DEVICE_ASSIGNMENT
+static void assigned_device_msi_dispatch(struct kvm_assigned_dev_kernel *dev)
+{
+#define GET_VAL_FROM_SHIFT(v, s) (((v) & (1 << s)) >> s)
+ int vcpu_id;
+ struct kvm_vcpu *vcpu;
+ struct kvm_ioapic *ioapic = ioapic_irqchip(dev->kvm);
+ u8 dest_id = MSI_ADDR_DEST_ID(dev->guest_msi_addr);
+ u8 vector = MSI_DATA_VECTOR(dev->guest_msi_data);
+ u8 dest_mode = GET_VAL_FROM_SHIFT(dev->guest_msi_addr,
+ MSI_ADDR_DEST_MODE_SHIFT);
+ u8 trig_mode = GET_VAL_FROM_SHIFT(dev->guest_msi_data,
+ MSI_DATA_TRIGGER_SHIFT);
+ u8 delivery_mode = GET_VAL_FROM_SHIFT(dev->guest_msi_data,
+ MSI_DATA_DELIVERY_MODE_SHIFT);
+ u32 deliver_bitmask;
+
+ BUG_ON(!ioapic);
+
+ deliver_bitmask = ioapic_get_delivery_bitmask(ioapic,
+ dest_id, dest_mode);
+ switch (delivery_mode) {
+ case MSI_DATA_DELIVERY_LOWPRI_VAL:
+ 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 MSI_DATA_DELIVERY_FIXED_VAL:
+ 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:
+ printk(KERN_INFO "kvm: unsupported MSI delivery mode\n");
+ }
+}
+
static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head
*head,
int assigned_dev_id)
{
--
1.5.4.5
--
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