The ACRN hypervisor can emulate a virtual device within hypervisor for a
Guest VM. The emulated virtual device can work without the ACRN
userspace after creation. The hypervisor do the emulation of that device.
To support the virtual device creating/destroying, HSM provides the
following ioctls:
- ACRN_IOCTL_CREATE_VDEV
Pass data struct acrn_vdev from userspace to the hypervisor, and inform
the hypervisor to create a virtual device for a User VM.
- ACRN_IOCTL_DESTROY_VDEV
Pass data struct acrn_vdev from userspace to the hypervisor, and inform
the hypervisor to destroy a virtual device of a User VM.
These new APIs will be used by user space code vm_add_hv_vdev and
vm_remove_hv_vdev in
https://github.com/projectacrn/acrn-hypervisor/blob/master/devicemodel/core/vmmapi.c
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Signed-off-by: Fei Li <fei1.li@intel.com>
Link: https://lore.kernel.org/r/20210923084128.18902-3-fei1.li@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
struct acrn_msi_entry *msi;
struct acrn_pcidev *pcidev;
struct acrn_irqfd irqfd;
+ struct acrn_vdev *vdev;
struct page *page;
u64 cstate_cmd;
int i, ret = 0;
"Failed to deassign pci device!\n");
kfree(pcidev);
break;
+ case ACRN_IOCTL_CREATE_VDEV:
+ vdev = memdup_user((void __user *)ioctl_param,
+ sizeof(struct acrn_vdev));
+ if (IS_ERR(vdev))
+ return PTR_ERR(vdev);
+
+ ret = hcall_create_vdev(vm->vmid, virt_to_phys(vdev));
+ if (ret < 0)
+ dev_dbg(acrn_dev.this_device,
+ "Failed to create virtual device!\n");
+ kfree(vdev);
+ break;
+ case ACRN_IOCTL_DESTROY_VDEV:
+ vdev = memdup_user((void __user *)ioctl_param,
+ sizeof(struct acrn_vdev));
+ if (IS_ERR(vdev))
+ return PTR_ERR(vdev);
+ ret = hcall_destroy_vdev(vm->vmid, virt_to_phys(vdev));
+ if (ret < 0)
+ dev_dbg(acrn_dev.this_device,
+ "Failed to destroy virtual device!\n");
+ kfree(vdev);
+ break;
case ACRN_IOCTL_SET_PTDEV_INTR:
irq_info = memdup_user((void __user *)ioctl_param,
sizeof(struct acrn_ptdev_irq));
#define HC_DEASSIGN_PCIDEV _HC_ID(HC_ID, HC_ID_PCI_BASE + 0x06)
#define HC_ASSIGN_MMIODEV _HC_ID(HC_ID, HC_ID_PCI_BASE + 0x07)
#define HC_DEASSIGN_MMIODEV _HC_ID(HC_ID, HC_ID_PCI_BASE + 0x08)
+#define HC_CREATE_VDEV _HC_ID(HC_ID, HC_ID_PCI_BASE + 0x09)
+#define HC_DESTROY_VDEV _HC_ID(HC_ID, HC_ID_PCI_BASE + 0x0A)
#define HC_ID_PM_BASE 0x80UL
#define HC_PM_GET_CPU_STATE _HC_ID(HC_ID, HC_ID_PM_BASE + 0x00)
}
/**
+ * hcall_create_vdev() - Create a virtual device for a User VM
+ * @vmid: User VM ID
+ * @addr: Service VM GPA of the &struct acrn_vdev
+ *
+ * Return: 0 on success, <0 on failure
+ */
+static inline long hcall_create_vdev(u64 vmid, u64 addr)
+{
+ return acrn_hypercall2(HC_CREATE_VDEV, vmid, addr);
+}
+
+/**
+ * hcall_destroy_vdev() - Destroy a virtual device of a User VM
+ * @vmid: User VM ID
+ * @addr: Service VM GPA of the &struct acrn_vdev
+ *
+ * Return: 0 on success, <0 on failure
+ */
+static inline long hcall_destroy_vdev(u64 vmid, u64 addr)
+{
+ return acrn_hypercall2(HC_DESTROY_VDEV, vmid, addr);
+}
+
+/**
* hcall_assign_mmiodev() - Assign a MMIO device to a User VM
* @vmid: User VM ID
* @addr: Service VM GPA of the &struct acrn_mmiodev
};
/**
+ * struct acrn_vdev - Info for creating or destroying a virtual device
+ * @id: Union of identifier of the virtual device
+ * @id.value: Raw data of the identifier
+ * @id.fields.vendor: Vendor id of the virtual PCI device
+ * @id.fields.device: Device id of the virtual PCI device
+ * @id.fields.legacy_id: ID of the virtual device if not a PCI device
+ * @slot: Virtual Bus/Device/Function of the virtual
+ * device
+ * @io_base: IO resource base address of the virtual device
+ * @io_size: IO resource size of the virtual device
+ * @args: Arguments for the virtual device creation
+ *
+ * The created virtual device can be a PCI device or a legacy device (e.g.
+ * a virtual UART controller) and it is emulated by the hypervisor. This
+ * structure will be passed to hypervisor directly.
+ */
+struct acrn_vdev {
+ /*
+ * the identifier of the device, the low 32 bits represent the vendor
+ * id and device id of PCI device and the high 32 bits represent the
+ * device number of the legacy device
+ */
+ union {
+ __u64 value;
+ struct {
+ __le16 vendor;
+ __le16 device;
+ __le32 legacy_id;
+ } fields;
+ } id;
+
+ __u64 slot;
+ __u32 io_addr[ACRN_PCI_NUM_BARS];
+ __u32 io_size[ACRN_PCI_NUM_BARS];
+ __u8 args[128];
+};
+
+/**
* struct acrn_msi_entry - Info for injecting a MSI interrupt to a VM
* @msi_addr: MSI addr[19:12] with dest vCPU ID
* @msi_data: MSI data[7:0] with vector
_IOW(ACRN_IOCTL_TYPE, 0x57, struct acrn_mmiodev)
#define ACRN_IOCTL_DEASSIGN_MMIODEV \
_IOW(ACRN_IOCTL_TYPE, 0x58, struct acrn_mmiodev)
+#define ACRN_IOCTL_CREATE_VDEV \
+ _IOW(ACRN_IOCTL_TYPE, 0x59, struct acrn_vdev)
+#define ACRN_IOCTL_DESTROY_VDEV \
+ _IOW(ACRN_IOCTL_TYPE, 0x5A, struct acrn_vdev)
#define ACRN_IOCTL_PM_GET_CPU_STATE \
_IOWR(ACRN_IOCTL_TYPE, 0x60, __u64)