[PATCH 7/9] KVM: Add assigned_device_msi_dispatch()

Sheng Yang
2008-11-24T06:36:39Z

The function is used to dispatch MSI to lapic according to MSI message
address and message data.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
---
virt/kvm/kvm_main.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 55 insertions(+), 0 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 2089f8b..228c1d1 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -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
@@ -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)
{
--
1.5.4.5