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KVM: Add assigned_device_msi_dispatch()
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The function is used to dispatch MSI to lapic according to MSI message
address and message data.

Signed-off-by: Sheng Yang <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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Sheng Yang authored and avikivity committed Dec 31, 2008
1 parent 68b76f5 commit f64769e
Showing 1 changed file with 55 additions and 0 deletions.
55 changes: 55 additions & 0 deletions virt/kvm/kvm_main.c
Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,10 @@
#include <asm/uaccess.h>
#include <asm/pgtable.h>

#ifdef CONFIG_X86
#include <asm/msidef.h>
#endif

#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
#include "coalesced_mmio.h"
#endif
Expand Down Expand Up @@ -78,6 +82,57 @@ static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
bool kvm_rebooting;

#ifdef KVM_CAP_DEVICE_ASSIGNMENT

#ifdef CONFIG_X86
static void assigned_device_msi_dispatch(struct kvm_assigned_dev_kernel *dev)
{
int vcpu_id;
struct kvm_vcpu *vcpu;
struct kvm_ioapic *ioapic = ioapic_irqchip(dev->kvm);
int dest_id = (dev->guest_msi.address_lo & MSI_ADDR_DEST_ID_MASK)
>> MSI_ADDR_DEST_ID_SHIFT;
int vector = (dev->guest_msi.data & MSI_DATA_VECTOR_MASK)
>> MSI_DATA_VECTOR_SHIFT;
int dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
(unsigned long *)&dev->guest_msi.address_lo);
int trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
(unsigned long *)&dev->guest_msi.data);
int delivery_mode = test_bit(MSI_DATA_DELIVERY_MODE_SHIFT,
(unsigned long *)&dev->guest_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:
printk(KERN_INFO "kvm: unsupported MSI delivery mode\n");
}
}
#else
static void assigned_device_msi_dispatch(struct kvm_assigned_dev_kernel *dev) {}
#endif

static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
int assigned_dev_id)
{
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