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Commit f64769eb authored by Sheng Yang's avatar Sheng Yang Committed by Avi Kivity
Browse files

KVM: Add assigned_device_msi_dispatch() 



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

Signed-off-by: default avatarSheng Yang <sheng@linux.intel.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 68b76f51

virt/kvm/kvm_main.c

+55 −0
Original line number Diff line number Diff line
@@ -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)

{