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virt: acrn: Introduce irqfd

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irqfd is a mechanism to inject a specific interrupt to a User VM using a
decoupled eventfd mechanism.

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

HSM provides ioctls to associate a virtual Message Signaled Interrupt
(MSI) with an eventfd. The corresponding virtual MSI will be injected
into a User VM once the eventfd got signal.

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/20210207031040.49576-17-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shuo Liu
2021-02-07 11:10:38 +08:00
committed by Greg Kroah-Hartman
parent d8ad515156
commit aa3b483ff1
6 changed files with 271 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
include/uapi/linux/acrn.h
View File

@@ -505,6 +505,19 @@ struct acrn_ioeventfd {
__u64 data;
};
#define ACRN_IRQFD_FLAG_DEASSIGN 0x01
/**
* struct acrn_irqfd - Data to operate a &struct hsm_irqfd
* @fd: The fd of eventfd associated with a hsm_irqfd
* @flags: Logical-OR of ACRN_IRQFD_FLAG_*
* @msi: Info of MSI associated with the irqfd
*/
struct acrn_irqfd {
__s32 fd;
__u32 flags;
struct acrn_msi_entry msi;
};
/* The ioctl type, documented in ioctl-number.rst */
#define ACRN_IOCTL_TYPE 0xA2
@@ -561,5 +574,7 @@ struct acrn_ioeventfd {
#define ACRN_IOCTL_IOEVENTFD \
_IOW(ACRN_IOCTL_TYPE, 0x70, struct acrn_ioeventfd)
#define ACRN_IOCTL_IRQFD \
_IOW(ACRN_IOCTL_TYPE, 0x71, struct acrn_irqfd)
#endif /* _UAPI_ACRN_H */