From: Feng Wu <feng.wu@intel.com>
To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: pbonzini@redhat.com, mtosatti@redhat.com,
alex.williamson@redhat.com, eric.auger@linaro.org,
feng.wu@intel.com
Subject: [v4 10/16] KVM: kvm-vfio: wrappers to VFIO external API device helpers
Date: Thu, 11 Jun 2015 18:51:46 +0800 [thread overview]
Message-ID: <1434019912-15423-11-git-send-email-feng.wu@intel.com> (raw)
In-Reply-To: <1434019912-15423-1-git-send-email-feng.wu@intel.com>
From: Eric Auger <eric.auger@linaro.org>
Provide wrapper functions that allow KVM-VFIO device code to
interact with a vfio device:
- kvm_vfio_device_get_external_user gets a handle to a struct
vfio_device from the vfio device file descriptor and increments
its reference counter,
- kvm_vfio_device_put_external_user decrements the reference counter
to a vfio device,
- kvm_vfio_external_base_device returns a handle to the struct device
of the vfio device.
Also kvm_vfio_get_vfio_device and kvm_vfio_put_vfio_device helpers
are introduced.
Signed-off-by: Eric Auger <eric.auger@linaro.org>
---
virt/kvm/vfio.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 74 insertions(+)
diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
index 620e37f..80a45e4 100644
--- a/virt/kvm/vfio.c
+++ b/virt/kvm/vfio.c
@@ -60,6 +60,80 @@ static void kvm_vfio_group_put_external_user(struct vfio_group *vfio_group)
symbol_put(vfio_group_put_external_user);
}
+static struct vfio_device *kvm_vfio_device_get_external_user(struct file *filep)
+{
+ struct vfio_device *vdev;
+ struct vfio_device *(*fn)(struct file *);
+
+ fn = symbol_get(vfio_device_get_external_user);
+ if (!fn)
+ return ERR_PTR(-EINVAL);
+
+ vdev = fn(filep);
+
+ symbol_put(vfio_device_get_external_user);
+
+ return vdev;
+}
+
+static void kvm_vfio_device_put_external_user(struct vfio_device *vdev)
+{
+ void (*fn)(struct vfio_device *);
+
+ fn = symbol_get(vfio_device_put_external_user);
+ if (!fn)
+ return;
+
+ fn(vdev);
+
+ symbol_put(vfio_device_put_external_user);
+}
+
+static struct device *kvm_vfio_external_base_device(struct vfio_device *vdev)
+{
+ struct device *(*fn)(struct vfio_device *);
+ struct device *dev;
+
+ fn = symbol_get(vfio_external_base_device);
+ if (!fn)
+ return NULL;
+
+ dev = fn(vdev);
+
+ symbol_put(vfio_external_base_device);
+
+ return dev;
+}
+
+/**
+ * kvm_vfio_get_vfio_device - Returns a handle to a vfio-device
+ *
+ * Checks it is a valid vfio device and increments its reference counter
+ * @fd: file descriptor of the vfio platform device
+ */
+static struct vfio_device *kvm_vfio_get_vfio_device(int fd)
+{
+ struct fd f = fdget(fd);
+ struct vfio_device *vdev;
+
+ if (!f.file)
+ return ERR_PTR(-EINVAL);
+ vdev = kvm_vfio_device_get_external_user(f.file);
+ fdput(f);
+ return vdev;
+}
+
+/**
+ * kvm_vfio_put_vfio_device: decrements the reference counter of the
+ * vfio platform * device
+ *
+ * @vdev: vfio_device handle to release
+ */
+static void kvm_vfio_put_vfio_device(struct vfio_device *vdev)
+{
+ kvm_vfio_device_put_external_user(vdev);
+}
+
static bool kvm_vfio_group_is_coherent(struct vfio_group *vfio_group)
{
long (*fn)(struct vfio_group *, unsigned long);
--
2.1.0
next prev parent reply other threads:[~2015-06-11 11:05 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-11 10:51 [v4 00/16] Add VT-d Posted-Interrupts support Feng Wu
2015-06-11 10:51 ` [v4 01/16] KVM: Extend struct pi_desc for VT-d Posted-Interrupts Feng Wu
2015-06-23 15:49 ` Paolo Bonzini
2015-06-24 5:42 ` Wu, Feng
2015-06-24 8:46 ` Paolo Bonzini
2015-06-11 10:51 ` [v4 02/16] KVM: Add some helper functions for Posted-Interrupts Feng Wu
2015-06-11 10:51 ` [v4 03/16] KVM: Define a new interface kvm_intr_is_single_vcpu() Feng Wu
2015-06-11 10:51 ` [v4 04/16] KVM: Get Posted-Interrupts descriptor address from struct kvm_vcpu Feng Wu
2015-06-11 10:51 ` [v4 05/16] KVM: Add interfaces to control PI outside vmx Feng Wu
2015-06-11 10:51 ` [v4 06/16] KVM: Make struct kvm_irq_routing_table accessible Feng Wu
2015-06-11 10:51 ` [v4 07/16] KVM: make kvm_set_msi_irq() public Feng Wu
2015-06-11 10:51 ` [v4 08/16] KVM: kvm-vfio: User API for IRQ forwarding Feng Wu
2015-06-11 13:37 ` Eric Auger
2015-06-12 0:20 ` Wu, Feng
2015-06-11 19:59 ` Avi Kivity
2015-06-12 0:23 ` Wu, Feng
2015-06-12 15:41 ` Alex Williamson
2015-06-12 18:48 ` Avi Kivity
2015-06-12 19:03 ` Alex Williamson
2015-06-15 6:42 ` Wu, Feng
2015-06-15 6:42 ` Wu, Feng
2015-06-15 16:17 ` Eric Auger
2015-06-15 16:45 ` Alex Williamson
2015-06-18 9:16 ` Wu, Feng
2015-06-18 9:16 ` Wu, Feng
2015-06-18 20:04 ` Alex Williamson
2015-06-24 15:46 ` Joerg Roedel
2015-06-25 1:54 ` Wu, Feng
2015-06-25 9:37 ` Wu, Feng
2015-06-25 15:11 ` Alex Williamson
2015-06-29 9:06 ` Joerg Roedel
2015-06-29 9:14 ` Wu, Feng
2015-06-29 9:22 ` Joerg Roedel
2015-06-29 13:01 ` Wu, Feng
2015-06-29 13:27 ` Wu, Feng
2015-06-29 13:27 ` Wu, Feng
2015-06-29 15:18 ` Alex Williamson
2015-06-24 15:50 ` Joerg Roedel
2015-06-24 16:25 ` Eric Auger
2015-06-24 19:49 ` Alex Williamson
2015-06-25 1:57 ` Wu, Feng
2015-06-25 1:57 ` Wu, Feng
2015-06-11 10:51 ` [v4 09/16] VFIO: external user API for interaction Feng Wu
2015-06-11 10:51 ` Feng Wu [this message]
2015-06-11 10:51 ` [v4 11/16] KVM: kvm-vfio: User API for VT-d Posted-Interrupts Feng Wu
2015-06-11 10:51 ` [v4 12/16] KVM: kvm-vfio: implement the VFIO skeleton " Feng Wu
2015-06-11 17:15 ` Alex Williamson
2015-06-12 4:54 ` Wu, Feng
2015-06-12 4:54 ` Wu, Feng
2015-06-12 14:51 ` Alex Williamson
2015-06-23 16:00 ` Paolo Bonzini
2015-06-11 10:51 ` [v4 13/16] KVM: x86: kvm-vfio: VT-d posted-interrupts setup Feng Wu
2015-06-11 17:16 ` Alex Williamson
2015-06-12 4:58 ` Wu, Feng
2015-06-12 4:58 ` Wu, Feng
2015-06-11 10:51 ` [v4 14/16] KVM: Update Posted-Interrupts Descriptor when vCPU is preempted Feng Wu
2015-06-11 10:51 ` [v4 15/16] KVM: Update Posted-Interrupts Descriptor when vCPU is blocked Feng Wu
2015-06-23 16:05 ` Paolo Bonzini
2015-06-11 10:51 ` [v4 16/16] KVM: Warn if 'SN' is set during posting interrupts by software Feng Wu
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