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Add documentation on the following aspects of ACRN: 1) A brief introduction on the architecture of ACRN. 2) I/O request handling in ACRN. 3) CPUID functions of ACRN. To learn more about ACRN, please go to ACRN project website https://projectacrn.org, or the documentation page https://projectacrn.github.io/. Cc: Dave Hansen <dave.hansen@intel.com> Cc: Sen Christopherson <sean.j.christopherson@intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Fengwei Yin <fengwei.yin@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> Cc: Randy Dunlap <rdunlap@infradead.org> Reviewed-by: Zhi Wang <zhi.a.wang@intel.com> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Reviewed-by: Borislav Petkov <bp@suse.de> Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Link: https://lore.kernel.org/r/20210207031040.49576-2-shuo.a.liu@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
47 lines
1.2 KiB
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47 lines
1.2 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
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===============
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ACRN CPUID bits
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===============
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A guest VM running on an ACRN hypervisor can check some of its features using
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CPUID.
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ACRN cpuid functions are:
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function: 0x40000000
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returns::
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eax = 0x40000010
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ebx = 0x4e524341
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ecx = 0x4e524341
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edx = 0x4e524341
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Note that this value in ebx, ecx and edx corresponds to the string
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"ACRNACRNACRN". The value in eax corresponds to the maximum cpuid function
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present in this leaf, and will be updated if more functions are added in the
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future.
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function: define ACRN_CPUID_FEATURES (0x40000001)
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returns::
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ebx, ecx, edx
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eax = an OR'ed group of (1 << flag)
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where ``flag`` is defined as below:
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================================= =========== ================================
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flag value meaning
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================================= =========== ================================
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ACRN_FEATURE_PRIVILEGED_VM 0 guest VM is a privileged VM
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================================= =========== ================================
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function: 0x40000010
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returns::
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ebx, ecx, edx
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eax = (Virtual) TSC frequency in kHz.
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