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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>
15 lines
577 B
Text
15 lines
577 B
Text
# SPDX-License-Identifier: GPL-2.0
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config ACRN_HSM
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tristate "ACRN Hypervisor Service Module"
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depends on ACRN_GUEST
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select EVENTFD
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help
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ACRN Hypervisor Service Module (HSM) is a kernel module which
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communicates with ACRN userspace through ioctls and talks to
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the ACRN Hypervisor through hypercalls. HSM will only run in
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a privileged management VM, called Service VM, to manage User
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VMs and do I/O emulation. Not required for simply running
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under ACRN as a User VM.
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To compile as a module, choose M, the module will be called
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acrn. If unsure, say N.
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