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virt: acrn: Introduce interfaces for PCI device passthrough

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PCI device passthrough enables an OS in a virtual machine to directly
access a PCI device in the host. It promises almost the native
performance, which is required in performance-critical scenarios of
ACRN.

HSM provides the following ioctls:
 - Assign - ACRN_IOCTL_ASSIGN_PCIDEV
   Pass data struct acrn_pcidev from userspace to the hypervisor, and
   inform the hypervisor to assign a PCI device to a User VM.

 - De-assign - ACRN_IOCTL_DEASSIGN_PCIDEV
   Pass data struct acrn_pcidev from userspace to the hypervisor, and
   inform the hypervisor to de-assign a PCI device from a User VM.

 - Set a interrupt of a passthrough device - ACRN_IOCTL_SET_PTDEV_INTR
   Pass data struct acrn_ptdev_irq from userspace to the hypervisor,
   and inform the hypervisor to map a INTx interrupt of passthrough
   device of User VM.

 - Reset passthrough device interrupt - ACRN_IOCTL_RESET_PTDEV_INTR
   Pass data struct acrn_ptdev_irq from userspace to the hypervisor,
   and inform the hypervisor to unmap a INTx interrupt of passthrough
   device of User VM.

Cc: Zhi Wang <zhi.a.wang@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Yu Wang <yu1.wang@intel.com>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Zhi Wang <zhi.a.wang@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Link: https://lore.kernel.org/r/20210207031040.49576-12-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shuo Liu
2021-02-07 11:10:33 +08:00
committed by Greg Kroah-Hartman
parent 3c4c331667
commit ce011e1363
3 changed files with 165 additions and 0 deletions
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61
include/uapi/linux/acrn.h
View File

@@ -365,6 +365,58 @@ struct acrn_vm_memmap {
__u64 len;
};
/* Type of interrupt of a passthrough device */
#define ACRN_PTDEV_IRQ_INTX 0
#define ACRN_PTDEV_IRQ_MSI 1
#define ACRN_PTDEV_IRQ_MSIX 2
/**
* struct acrn_ptdev_irq - Interrupt data of a passthrough device.
* @type: Type (ACRN_PTDEV_IRQ_*)
* @virt_bdf: Virtual Bus/Device/Function
* @phys_bdf: Physical Bus/Device/Function
* @intx: Info of interrupt
* @intx.virt_pin: Virtual IOAPIC pin
* @intx.phys_pin: Physical IOAPIC pin
* @intx.is_pic_pin: Is PIC pin or not
*
* This structure will be passed to hypervisor directly.
*/
struct acrn_ptdev_irq {
__u32 type;
__u16 virt_bdf;
__u16 phys_bdf;
struct {
__u32 virt_pin;
__u32 phys_pin;
__u32 is_pic_pin;
} intx;
};
/* Type of PCI device assignment */
#define ACRN_PTDEV_QUIRK_ASSIGN (1U << 0)
#define ACRN_PCI_NUM_BARS 6
/**
* struct acrn_pcidev - Info for assigning or de-assigning a PCI device
* @type: Type of the assignment
* @virt_bdf: Virtual Bus/Device/Function
* @phys_bdf: Physical Bus/Device/Function
* @intr_line: PCI interrupt line
* @intr_pin: PCI interrupt pin
* @bar: PCI BARs.
*
* This structure will be passed to hypervisor directly.
*/
struct acrn_pcidev {
__u32 type;
__u16 virt_bdf;
__u16 phys_bdf;
__u8 intr_line;
__u8 intr_pin;
__u32 bar[ACRN_PCI_NUM_BARS];
};
/* The ioctl type, documented in ioctl-number.rst */
#define ACRN_IOCTL_TYPE 0xA2
@@ -400,4 +452,13 @@ struct acrn_vm_memmap {
#define ACRN_IOCTL_UNSET_MEMSEG \
_IOW(ACRN_IOCTL_TYPE, 0x42, struct acrn_vm_memmap)
#define ACRN_IOCTL_SET_PTDEV_INTR \
_IOW(ACRN_IOCTL_TYPE, 0x53, struct acrn_ptdev_irq)
#define ACRN_IOCTL_RESET_PTDEV_INTR \
_IOW(ACRN_IOCTL_TYPE, 0x54, struct acrn_ptdev_irq)
#define ACRN_IOCTL_ASSIGN_PCIDEV \
_IOW(ACRN_IOCTL_TYPE, 0x55, struct acrn_pcidev)
#define ACRN_IOCTL_DEASSIGN_PCIDEV \
_IOW(ACRN_IOCTL_TYPE, 0x56, struct acrn_pcidev)
#endif /* _UAPI_ACRN_H */