doc: change term of vm0 to sos_vm

Using term of VM0 would mislead to a VM with VM id 0 easily, whereas
VM id 0 could be used for any PRE_LAUNCHED_VM. So replace VM0 with
SOS_VM.

Signed-off-by: Victor Sun <victor.sun@intel.com>

doc/developer-guides/hld/hld-devicemodel.rst

@@ -981,8 +981,8 @@ potentially error-prone.
 ACPI Emulation
 --------------
 
-An alternative ACPI resource abstraction option is for the SOS (VM0) to
+An alternative ACPI resource abstraction option is for the SOS (SOS_VM) to
-own all devices and emulate a set of virtual devices for the UOS (VM1).
+own all devices and emulate a set of virtual devices for the UOS (NORMAL_VM).
 This is the most popular ACPI resource model for virtualization,
 as shown in the picture below. ACRN currently
 uses device emulation plus some device passthrough for UOS.

doc/developer-guides/hld/hv-memmgt.rst

@@ -516,7 +516,7 @@ Host to Guest Mapping
 =====================
 
 ACRN hypervisor creates Service OS's host (HPA) to guest (GPA) mapping
-(EPT mapping) through the function ``prepare_vm0_memmap_and_e820()``
+(EPT mapping) through the function ``prepare_sos_vm_memmap()``
 when it creates the SOS VM. It follows these rules:
 
 -  Identical mapping

doc/developer-guides/hld/hv-startup.rst

@@ -151,7 +151,7 @@ The main steps include:
 
    Hypervisor VM Startup Flow
 
-SW configuration for Service OS (VM0):
+SW configuration for Service OS (SOS_VM):
 
 -  **ACPI**: HV passes the entire ACPI table from bootloader to Service
    OS directly. Legacy mode is currently supported as the ACPI table
@@ -162,13 +162,13 @@ SW configuration for Service OS (VM0):
    filtered out.
 
 -  **Zero Page**: HV prepares the zero page at the high end of Service
-   OS memory which is determined by VM0 guest FIT binary build. The
+   OS memory which is determined by SOS_VM guest FIT binary build. The
    zero page includes configuration for ramdisk, bootargs and e820
    entries. The zero page address will be set to "Primary CPU" RSI
    register before VCPU gets run.
 
 -  **Entry address**: HV will copy Service OS kernel image to 0x1000000
-   as entry address for VM0's "Primary CPU". This entry address will
+   as entry address for SOS_VM's "Primary CPU". This entry address will
    be set to "Primary CPU" RIP register before VCPU gets run.
 
 SW configuration for User OS (VMx):

doc/developer-guides/hld/hv-vt-d.rst

@@ -147,14 +147,14 @@ there is a EPT table for Normal world, and there may be a EPT table for
 Secure World. Secure world can access Normal World's memory, but Normal
 world cannot access Secure World's memory.
 
-VM0 domain
+SOS_VM domain
-   VM0 domain is created when the hypervisor creates VM0 for the
+   SOS_VM domain is created when the hypervisor creates VM for the
    Service OS.
 
-   IOMMU uses the EPT table of Normal world of VM0 as the address
+   IOMMU uses the EPT table of Normal world of SOS_VM as the address
-   translation structures for the devices in VM0 domain. The Normal world's
+   translation structures for the devices in SOS_VM domain. The Normal world's
-   EPT table of VM0 doesn't include the memory resource of the hypervisor
+   EPT table of SOS_VM doesn't include the memory resource of the hypervisor
-   and Secure worlds if any. So the devices in VM0 domain can't access the
+   and Secure worlds if any. So the devices in SOS_VM domain can't access the
    memory belong to hypervisor or secure worlds.
 
 Other domains
@@ -252,24 +252,24 @@ be multiple DMAR units on the platform, ACRN allows some of the DMAR
 units to be ignored. If some DMAR unit(s) are marked as ignored, they
 would not be enabled.
 
-Hypervisor creates VM0 domain using the Normal World's EPT table of VM0
+Hypervisor creates SOS_VM domain using the Normal World's EPT table of SOS_VM
-as address translation table when creating VM0 as Service OS. And all
+as address translation table when creating SOS_VM as Service OS. And all
-PCI devices on the platform are added to VM0 domain. Then enable DMAR
+PCI devices on the platform are added to SOS_VM domain. Then enable DMAR
 translation for DMAR unit(s) if they are not marked as ignored.
 
 Device assignment
 *****************
 
-All devices are initially added to VM0 domain.
+All devices are initially added to SOS_VM domain.
 To assign a device means to assign the device to an User OS. The device
-is remove from VM0 domain and added to the VM domain related to the User
+is remove from SOS_VM domain and added to the VM domain related to the User
-OS, which changes the address translation table from EPT of VM0 to EPT
+OS, which changes the address translation table from EPT of SOS_VM to EPT
 of User OS for the device.
 
 To unassign a device means to unassign the device from an User OS. The
 device is remove from the VM domain related to the User OS, then added
-back to VM0 domain, which changes the address translation table from EPT
+back to SOS_VM domain, which changes the address translation table from EPT
-of User OS to EPT of VM0 for the device.
+of User OS to EPT of SOS_VM for the device.
 
 Power Management support for S3
 *******************************

doc/developer-guides/primer.rst

@@ -482,7 +482,7 @@ Device Assignment Management
 ACRN hypervisor provides major device assignment management. Since the
 hypervisor owns all native vectors and IRQs, there must be a mapping
 table to handle the Guest IRQ/Vector to Host IRQ/Vector. Currently we
-assign all devices to VM0 except the UART.
+assign all devices to SOS_VM except the UART.
 
 If a PCI device (with MSI/MSI-x) is assigned to Guest, the User OS will
 program the PCI config space and set the guest vector to this device. A
@@ -504,7 +504,7 @@ vector for the device:
   (vIOAPC) Redirection Table Entries (RTE).
 
 **Legacy**
-  Legacy devices are assigned to VM0.
+  Legacy devices are assigned to SOS_VM.
 
 User OS device assignment is similar to the above, except the User OS
 doesn't call hypercall. Instead, the Guest program PCI configuration

doc/faq.rst

@@ -57,7 +57,7 @@ Setup ``SOS_RAM_SIZE`` = 32G too (The SOS will have the whole resource)
 ::
 
   config SOS_RAM_SIZE
-        hex "Size of the vm0 (SOS) RAM"
+        hex "Size of the Service OS (SOS) RAM"
         default 0x200000000 if PLATFORM_SBL
         default 0x800000000 if PLATFORM_UEFI
 

doc/introduction/index.rst

@@ -62,8 +62,8 @@ A **Rear Seat Entertainment (RSE)** system could run:
 The ACRN hypervisor can support both Linux\* VM and Android\* VM as a
 User OS, with the User OS managed by the ACRN hypervisor. Developers and
 OEMs can use this reference stack to run their own VMs, together with
-IC, IVI, and RSE VMs. The Service OS runs as VM0 (also known as Dom0 in
+IC, IVI, and RSE VMs. The Service OS runs as SOS_VM (also known as Dom0 in
-other hypervisors) and the User OS runs as VM1, (also known as DomU).
+other hypervisors) and the User OS runs as NORMAL_VM, (also known as DomU).
 
 :numref:`ivi-block` shows an example block diagram of using the ACRN
 hypervisor.