Commit 424f1ac2 authored by Shuo Liu's avatar Shuo Liu Committed by Greg Kroah-Hartman
Browse files

virt: acrn: Introduce interfaces for virtual device creating/destroying 

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: default avatarShuo Liu <shuo.a.liu@intel.com>
Signed-off-by: default avatarFei Li <fei1.li@intel.com>
Link: https://lore.kernel.org/r/20210923084128.18902-3-fei1.li@intel.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 29a9f275

drivers/virt/acrn/hsm.c

+24 −0
Original line number Diff line number Diff line
@@ -118,6 +118,7 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd, 
	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;
@@ -266,6 +267,29 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd, 
				"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));

drivers/virt/acrn/hypercall.h

+26 −0
Original line number Diff line number Diff line
@@ -43,6 +43,8 @@ 
#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)
@@ -196,6 +198,30 @@ static inline long hcall_set_memory_regions(u64 regions_pa) 
	return acrn_hypercall1(HC_VM_SET_MEMORY_REGIONS, regions_pa);

}



/**

 * 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

include/uapi/linux/acrn.h

+42 −0
Original line number Diff line number Diff line
@@ -441,6 +441,44 @@ struct acrn_mmiodev { 
	} res[ACRN_MMIODEV_RES_NUM];

};



/**

 * 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
@@ -596,6 +634,10 @@ struct acrn_irqfd { 
	_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)