[3/7,V3] kvm: libkvm: add deassign ioctl

Commit Message

Han, Weidong Feb. 13, 2009, 9:49 a.m. UTC

add this to support hot remove device with iommu

Acked-by: Mark McLoughlin <[e-mail]>
Signed-off-by: Weidong Han <[e-mail]>
---
 libkvm/libkvm.c |   14 ++++++++++++++
 libkvm/libkvm.h |   13 +++++++++++++
 2 files changed, 27 insertions(+), 0 deletions(-)

Patch

diff --git a/libkvm/libkvm.c b/libkvm/libkvm.c
index 92ffe10..a559a0d 100644
--- a/libkvm/libkvm.c
+++ b/libkvm/libkvm.c
@@ -1141,6 +1141,20 @@  int kvm_assign_irq(kvm_context_t kvm,
 }
 #endif
 
+#ifdef KVM_CAP_DEVICE_DEASSIGNMENT
+int kvm_deassign_pci_device(kvm_context_t kvm,
+			    struct kvm_assigned_pci_dev *assigned_dev)
+{
+	int ret;
+
+	ret = ioctl(kvm->vm_fd, KVM_DEASSIGN_PCI_DEVICE, assigned_dev);
+	if (ret < 0)
+		return -errno;
+
+	return ret;
+}
+#endif
+
 int kvm_destroy_memory_region_works(kvm_context_t kvm)
 {
 	int ret = 0;
diff --git a/libkvm/libkvm.h b/libkvm/libkvm.h
index e79e4fd..f6d653c 100644
--- a/libkvm/libkvm.h
+++ b/libkvm/libkvm.h
@@ -737,6 +737,19 @@  int kvm_assign_irq(kvm_context_t kvm,
 int kvm_destroy_memory_region_works(kvm_context_t kvm);
 #endif
 
+#ifdef KVM_CAP_DEVICE_DEASSIGNMENT
+/*!
+ * \brief Notifies host kernel about a PCI device to be deassigned from a guest
+ *
+ * Used for hot remove PCI device, this function notifies the host
+ * kernel about the deassigning of the physical PCI device from a guest.
+ *
+ * \param kvm Pointer to the current kvm_context
+ * \param assigned_dev Parameters, like bus, devfn number, etc
+ */
+int kvm_deassign_pci_device(kvm_context_t kvm,
+			    struct kvm_assigned_pci_dev *assigned_dev);
+#endif
 
 /*!
  * \brief Checks whether the generic irq routing capability is present