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| author | Sheng Yang <sheng@linux.intel.com> | 2008-11-24 14:32:55 +0800 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2008-12-31 16:55:02 +0200 |
| commit | f64769eb05565c74d7fce6fa75d65924f9cdaf79 (patch) | |
| tree | e1f0ba42a24d2aa349da7da019fc2c8f516e25bf /virt/kvm/kvm_main.c | |
| parent | 68b76f51675809c8ce200a86276c3c7266f17a64 (diff) | |
| download | lwn-f64769eb05565c74d7fce6fa75d65924f9cdaf79.tar.gz lwn-f64769eb05565c74d7fce6fa75d65924f9cdaf79.zip | |
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: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt/kvm/kvm_main.c')
| -rw-r--r-- | 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 2089f8b68a16..228c1d18a614 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) { |