From 33a205c91324c57646928169f33077a1c889104d Mon Sep 17 00:00:00 2001 From: Amy Reyes Date: Tue, 9 Nov 2021 15:40:00 -0800 Subject: [PATCH] doc: terminology cleanup in trusty doc - Replace SOS or Service OS with Service VM - Replace UOS or User OS with User VM - Clean up some of the grammar Signed-off-by: Amy Reyes --- doc/developer-guides/images/trusty-arch.png | Bin 18058 -> 16481 bytes .../images/trusty-boot-flow.dot | 7 ++- doc/developer-guides/trusty.rst | 54 ++++++++++-------- 3 files changed, 34 insertions(+), 27 deletions(-) diff --git a/doc/developer-guides/images/trusty-arch.png b/doc/developer-guides/images/trusty-arch.png index 5ba2b998b7fdc9fa003e580590aeb32ac209741d..76cef6ff233cf86074e576793c3951ccdfd5406a 100644 GIT binary patch literal 16481 zcmeHu2T)VnyYIF)lw&uj;E|{lD?u?*ax6rm0!9dkQdERc3`p-_If`Nci6GK~5)}vn zDiEYbMd>7lVuSz@DWOLM5+Nk}t$5D={C#)k-FN2Boq6xx`)7vC-aBipy}tgf@B8KU zNt2^X7b`7>AZRJh=*TGunoEYDIm;H#0Z)!wl3s%w=;R4=LvRa01PG!-5DXz92uXmD 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:width: 800px - :name: Trusty Architectural diagram + :name: trusty-architectural-diagram + + Trusty Architectural Diagram .. note:: - Trusty OS is running in Secure World in the architecture drawing above. + The Trusty OS is running in the Secure World in the architecture drawing + above. .. _trusty-hypercalls: @@ -51,7 +54,7 @@ There are a few :ref:`hypercall_apis` that are related to Trusty. Trusty Boot Flow **************** -By design, the User OS bootloader (``UOS_Loader``) will trigger the Trusty +By design, the User VM OS bootloader will trigger the Trusty boot process. The complete boot flow is illustrated below. .. graphviz:: images/trusty-boot-flow.dot @@ -62,12 +65,12 @@ boot process. The complete boot flow is illustrated below. As shown in the above figure, here are some details about the Trusty boot flow processing: -1. UOS_Loader +1. User VM OS bootloader a. Load and verify Trusty image from virtual disk - #. Allocate runtime memory for trusty - #. Do ELF relocation of trusty image and get entry address - #. Call ``hcall_initialize_trusty`` with trusty memory base and + #. Allocate runtime memory for Trusty + #. Do ELF relocation of Trusty image and get entry address + #. Call ``hcall_initialize_trusty`` with Trusty memory base and entry address #. ACRN (``hcall_initialize_trusty``) @@ -83,41 +86,44 @@ boot flow processing: a. Save World context for the World that caused this ``vmexit`` (Secure World) - #. Restore World context for next World (Normal World (UOS_Loader)) - #. Resume to next World (UOS_Loader) -#. UOS_Loader + #. Restore World context for next World (Normal World: User VM OS bootloader) + #. Resume to next World (User VM OS bootloader) +#. User VM OS bootloader a. Continue to boot EPT Hierarchy ************* -As per the Trusty design, Trusty can access Normal World's memory, but Normal -World cannot access Secure World's memory. Hence it means Secure World EPTP -page table hierarchy must contain normal world GPA address space, while Trusty -world's GPA address space must be removed from the Normal world EPTP page -table hierarchy. +As per the Trusty design, Trusty can access the Normal World's memory, but the +Normal World cannot access the Secure World's memory. Hence it means the Secure +World EPTP page table hierarchy must contain the Normal World GPA address space, +while the Trusty world's GPA address space must be removed from the Normal World +EPTP page table hierarchy. Design ====== -Put Secure World's GPA to very high position: 511 GB - 512 GB. The PML4/PDPT -for Trusty World are separated from Normal World. PD/PT for low memory -(< 511 GB) are shared in both Trusty World's EPT and Normal World's EPT. -PD/PT for high memory (>= 511 GB) are valid for Trusty World's EPT only. +Put the Secure World's GPA to a very high position: 511 GB - 512 GB. The +PML4/PDPT for the Trusty World are separated from the Normal World. PD and PT +for low memory +(< 511 GB) are shared in both the Trusty World's EPT and the Normal World's EPT. +PD and PT for high memory (>= 511 GB) are valid for the Trusty World's EPT only. Benefit ======= -This design will benefit the EPT changes of Normal World. There are -requirements to modify Normal World's EPT during runtime such as increasing -memory, changing attributes, etc. If such behavior happened, only PD and PT -for Normal World need to be updated. +This design will benefit the EPT changes of the Normal World. There are +requirements to modify the Normal World's EPT during runtime such as increasing +memory and changing attributes. If such behavior happens, only PD and PT +for the Normal World need to be updated. .. figure:: images/ept-hierarchy.png :align: center :width: 800px - :name: EPT hierarchy pic + :name: ept-hierarchy + + EPT Hierarchy API ===