en Copyright 2015 Java http://172.16.0.5:8080/history/linux-6.15/drivers/virt/acrn/Kconfig#d8ad5151 virt: acrn: Introduce ioeventfdioeventfd is a mechanism to register PIO/MMIO regions to trigger aneventfd signal when written to by a User VM. ACRN userspace can registerany arbitrary I/O address with a corresponding eventfd and then pass theeventfd 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 VMduring VM creation. HSM provides ioctls to associate an I/O region witha eventfd. The I/O client signals a eventfd once its corresponding I/Oregion 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.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> List of files: /linux-6.15/drivers/virt/acrn/Kconfig Sun, 07 Feb 2021 03:10:37 +0000 Shuo Liu <shuo.a.liu@intel.com> http://172.16.0.5:8080/history/linux-6.15/drivers/virt/acrn/Kconfig#666834c4 virt: acrn: Introduce ACRN HSM basic driverACRN Hypervisor Service Module (HSM) is a kernel module in Service VMwhich communicates with ACRN userspace through ioctls and talks to ACRNHypervisor through hypercalls.Add a basic HSM driver which allows Service VM userspace to communicatewith ACRN. The following patches will add more ioctls, guest VM memorymapping caching, I/O request processing, ioeventfd and irqfd into thismodule. HSM exports a char device interface (/dev/acrn_hsm) to userspace.Cc: Dave Hansen <dave.hansen@intel.com>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: Reinette Chatre <reinette.chatre@intel.com>Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>Link: https://lore.kernel.org/r/20210207031040.49576-6-shuo.a.liu@intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> List of files: /linux-6.15/drivers/virt/acrn/Kconfig Sun, 07 Feb 2021 03:10:27 +0000 Shuo Liu <shuo.a.liu@intel.com>