KVM: Ioctls for init MSI-X entry

Introduce KVM_SET_MSIX_NR and KVM_SET_MSIX_ENTRY two ioctls.

This two ioctls are used by userspace to specific guest device MSI-X entry
number and correlate MSI-X entry with GSI during the initialization stage.

MSI-X should be well initialzed before enabling.

Don't support change MSI-X entry number for now.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 1a2f98fbecea..432edc27e82b 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -319,6 +319,12 @@ struct kvm_irq_ack_notifier {
         void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
 };
 
+struct kvm_guest_msix_entry {
+        u32 vector;
+        u16 entry;
+        u16 flags;
+};
+
 struct kvm_assigned_dev_kernel {
         struct kvm_irq_ack_notifier ack_notifier;
         struct work_struct interrupt_work;
@@ -326,13 +332,17 @@ struct kvm_assigned_dev_kernel {
         int assigned_dev_id;
         int host_busnr;
         int host_devfn;
+        unsigned int entries_nr;
         int host_irq;
         bool host_irq_disabled;
+        struct msix_entry *host_msix_entries;
         int guest_irq;
+        struct kvm_guest_msix_entry *guest_msix_entries;
 #define KVM_ASSIGNED_DEV_GUEST_INTX     (1 << 0)
 #define KVM_ASSIGNED_DEV_GUEST_MSI      (1 << 1)
 #define KVM_ASSIGNED_DEV_HOST_INTX      (1 << 8)
 #define KVM_ASSIGNED_DEV_HOST_MSI       (1 << 9)
+#define KVM_ASSIGNED_DEV_MSIX           ((1 << 2) | (1 << 10))
         unsigned long irq_requested_type;
         int irq_source_id;
         int flags;