virt: acrn: Introduce EPT mapping management
The HSM provides hypervisor services to the ACRN userspace. While launching a User VM, ACRN userspace needs to allocate memory and request the ACRN Hypervisor to set up the EPT mapping for the VM. A mapping cache is introduced for accelerating the translation between the Service VM kernel virtual address and User VM physical address. >From the perspective of the hypervisor, the types of GPA of User VM can be listed as following: 1) RAM region, which is used by User VM as system ram. 2) MMIO region, which is recognized by User VM as MMIO. MMIO region is used to be utilized for devices emulation. Generally, User VM RAM regions mapping is set up before VM started and is released in the User VM destruction. MMIO regions mapping may be set and unset dynamically during User VM running. To achieve this, ioctls ACRN_IOCTL_SET_MEMSEG and ACRN_IOCTL_UNSET_MEMSEG are introduced in HSM. 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/20210207031040.49576-9-shuo.a.liu@intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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drivers/virt/acrn/mm.c
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