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virt: acrn: Introduce ioeventfd

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ioeventfd is a mechanism to register PIO/MMIO regions to trigger an
eventfd signal when written to by a User VM. ACRN userspace can register
any arbitrary I/O address with a corresponding eventfd and then pass the
eventfd to a specific end-point of interest for handling.

Vhost is a kernel-level virtio server which uses eventfd for signalling.
To support vhost on ACRN, ioeventfd is introduced in HSM.

A new I/O client dedicated to ioeventfd is associated with a User VM
during VM creation. HSM provides ioctls to associate an I/O region with
a eventfd. The I/O client signals a eventfd once its corresponding I/O
region is matched with an I/O request.

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/20210207031040.49576-16-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shuo Liu
2021-02-07 11:10:37 +08:00
committed by Greg Kroah-Hartman
parent 5a0c9f176f
commit d8ad515156
7 changed files with 327 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
include/uapi/linux/acrn.h
View File

@@ -479,6 +479,32 @@ enum acrn_pm_cmd_type {
ACRN_PMCMD_GET_CX_DATA,
};
#define ACRN_IOEVENTFD_FLAG_PIO 0x01
#define ACRN_IOEVENTFD_FLAG_DATAMATCH 0x02
#define ACRN_IOEVENTFD_FLAG_DEASSIGN 0x04
/**
* struct acrn_ioeventfd - Data to operate a &struct hsm_ioeventfd
* @fd: The fd of eventfd associated with a hsm_ioeventfd
* @flags: Logical-OR of ACRN_IOEVENTFD_FLAG_*
* @addr: The start address of IO range of ioeventfd
* @len: The length of IO range of ioeventfd
* @reserved: Reserved and should be 0
* @data: Data for data matching
*
* Without flag ACRN_IOEVENTFD_FLAG_DEASSIGN, ioctl ACRN_IOCTL_IOEVENTFD
* creates a &struct hsm_ioeventfd with properties originated from &struct
* acrn_ioeventfd. With flag ACRN_IOEVENTFD_FLAG_DEASSIGN, ioctl
* ACRN_IOCTL_IOEVENTFD destroys the &struct hsm_ioeventfd matching the fd.
*/
struct acrn_ioeventfd {
__u32 fd;
__u32 flags;
__u64 addr;
__u32 len;
__u32 reserved;
__u64 data;
};
/* The ioctl type, documented in ioctl-number.rst */
#define ACRN_IOCTL_TYPE 0xA2
@@ -533,4 +559,7 @@ enum acrn_pm_cmd_type {
#define ACRN_IOCTL_PM_GET_CPU_STATE \
_IOWR(ACRN_IOCTL_TYPE, 0x60, __u64)
#define ACRN_IOCTL_IOEVENTFD \
_IOW(ACRN_IOCTL_TYPE, 0x70, struct acrn_ioeventfd)
#endif /* _UAPI_ACRN_H */