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KVM: Document device assigment API

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Adds API documentation for KVM_[DE]ASSIGN_PCI_DEVICE,
KVM_[DE]ASSIGN_DEV_IRQ, KVM_SET_GSI_ROUTING, KVM_ASSIGN_SET_MSIX_NR, and
KVM_ASSIGN_SET_MSIX_ENTRY.

Acked-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka 2010-11-16 22:30:07 +01:00 committed by Avi Kivity
parent 51de271d44
commit 49f4817204
1 changed files with 178 additions and 0 deletions
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178
Documentation/kvm/api.txt
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@ -1085,6 +1085,184 @@ of 4 instructions that make up a hypercall.
If any additional field gets added to this structure later on, a bit for that
additional piece of information will be set in the flags bitmap.
4.47 KVM_ASSIGN_PCI_DEVICE
Capability: KVM_CAP_DEVICE_ASSIGNMENT
Architectures: x86 ia64
Type: vm ioctl
Parameters: struct kvm_assigned_pci_dev (in)
Returns: 0 on success, -1 on error
Assigns a host PCI device to the VM.
struct kvm_assigned_pci_dev {
__u32 assigned_dev_id;
__u32 busnr;
__u32 devfn;
__u32 flags;
__u32 segnr;
union {
__u32 reserved[11];
};
};
The PCI device is specified by the triple segnr, busnr, and devfn.
Identification in succeeding service requests is done via assigned_dev_id. The
following flags are specified:
/* Depends on KVM_CAP_IOMMU */
#define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0)
4.48 KVM_DEASSIGN_PCI_DEVICE
Capability: KVM_CAP_DEVICE_DEASSIGNMENT
Architectures: x86 ia64
Type: vm ioctl
Parameters: struct kvm_assigned_pci_dev (in)
Returns: 0 on success, -1 on error
Ends PCI device assignment, releasing all associated resources.
See KVM_CAP_DEVICE_ASSIGNMENT for the data structure. Only assigned_dev_id is
used in kvm_assigned_pci_dev to identify the device.
4.49 KVM_ASSIGN_DEV_IRQ
Capability: KVM_CAP_ASSIGN_DEV_IRQ
Architectures: x86 ia64
Type: vm ioctl
Parameters: struct kvm_assigned_irq (in)
Returns: 0 on success, -1 on error
Assigns an IRQ to a passed-through device.
struct kvm_assigned_irq {
__u32 assigned_dev_id;
__u32 host_irq;
__u32 guest_irq;
__u32 flags;
union {
struct {
__u32 addr_lo;
__u32 addr_hi;
__u32 data;
} guest_msi;
__u32 reserved[12];
};
};
The following flags are defined:
#define KVM_DEV_IRQ_HOST_INTX (1 << 0)
#define KVM_DEV_IRQ_HOST_MSI (1 << 1)
#define KVM_DEV_IRQ_HOST_MSIX (1 << 2)
#define KVM_DEV_IRQ_GUEST_INTX (1 << 8)
#define KVM_DEV_IRQ_GUEST_MSI (1 << 9)
#define KVM_DEV_IRQ_GUEST_MSIX (1 << 10)
It is not valid to specify multiple types per host or guest IRQ. However, the
IRQ type of host and guest can differ or can even be null.
4.50 KVM_DEASSIGN_DEV_IRQ
Capability: KVM_CAP_ASSIGN_DEV_IRQ
Architectures: x86 ia64
Type: vm ioctl
Parameters: struct kvm_assigned_irq (in)
Returns: 0 on success, -1 on error
Ends an IRQ assignment to a passed-through device.
See KVM_ASSIGN_DEV_IRQ for the data structure. The target device is specified
by assigned_dev_id, flags must correspond to the IRQ type specified on
KVM_ASSIGN_DEV_IRQ. Partial deassignment of host or guest IRQ is allowed.
4.51 KVM_SET_GSI_ROUTING
Capability: KVM_CAP_IRQ_ROUTING
Architectures: x86 ia64
Type: vm ioctl
Parameters: struct kvm_irq_routing (in)
Returns: 0 on success, -1 on error
Sets the GSI routing table entries, overwriting any previously set entries.
struct kvm_irq_routing {
__u32 nr;
__u32 flags;
struct kvm_irq_routing_entry entries[0];
};
No flags are specified so far, the corresponding field must be set to zero.
struct kvm_irq_routing_entry {
__u32 gsi;
__u32 type;
__u32 flags;
__u32 pad;
union {
struct kvm_irq_routing_irqchip irqchip;
struct kvm_irq_routing_msi msi;
__u32 pad[8];
} u;
};
/* gsi routing entry types */
#define KVM_IRQ_ROUTING_IRQCHIP 1
#define KVM_IRQ_ROUTING_MSI 2
No flags are specified so far, the corresponding field must be set to zero.
struct kvm_irq_routing_irqchip {
__u32 irqchip;
__u32 pin;
};
struct kvm_irq_routing_msi {
__u32 address_lo;
__u32 address_hi;
__u32 data;
__u32 pad;
};
4.52 KVM_ASSIGN_SET_MSIX_NR
Capability: KVM_CAP_DEVICE_MSIX
Architectures: x86 ia64
Type: vm ioctl
Parameters: struct kvm_assigned_msix_nr (in)
Returns: 0 on success, -1 on error
Set the number of MSI-X interrupts for an assigned device. This service can
only be called once in the lifetime of an assigned device.
struct kvm_assigned_msix_nr {
__u32 assigned_dev_id;
__u16 entry_nr;
__u16 padding;
};
#define KVM_MAX_MSIX_PER_DEV 256
4.53 KVM_ASSIGN_SET_MSIX_ENTRY
Capability: KVM_CAP_DEVICE_MSIX
Architectures: x86 ia64
Type: vm ioctl
Parameters: struct kvm_assigned_msix_entry (in)
Returns: 0 on success, -1 on error
Specifies the routing of an MSI-X assigned device interrupt to a GSI. Setting
the GSI vector to zero means disabling the interrupt.
struct kvm_assigned_msix_entry {
__u32 assigned_dev_id;
__u32 gsi;
__u16 entry; /* The index of entry in the MSI-X table */
__u16 padding[3];
};
5. The kvm_run structure
Application code obtains a pointer to the kvm_run structure by