docs/specs/acpi_mem_hotplug: Convert to rST

Convert the acpi memory hotplug spec to rST.

Note that this includes converting a lot of weird whitespace
characters to plain old spaces (the rST parser does not like
whatever the old ones were).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Message-id: 20210727170414.3368-3-peter.maydell@linaro.org

docs/specs/acpi_mem_hotplug.rst

@@ -0,0 +1,128 @@
+QEMU<->ACPI BIOS memory hotplug interface
+=========================================
+
+ACPI BIOS GPE.3 handler is dedicated for notifying OS about memory hot-add
+and hot-remove events.
+
+Memory hot-plug interface (IO port 0xa00-0xa17, 1-4 byte access)
+----------------------------------------------------------------
+
+Read access behavior
+^^^^^^^^^^^^^^^^^^^^
+
+[0x0-0x3]
+  Lo part of memory device phys address
+[0x4-0x7]
+  Hi part of memory device phys address
+[0x8-0xb]
+  Lo part of memory device size in bytes
+[0xc-0xf]
+  Hi part of memory device size in bytes
+[0x10-0x13]
+  Memory device proximity domain
+[0x14]
+  Memory device status fields
+
+  bits:
+
+  0:
+    Device is enabled and may be used by guest
+  1:
+    Device insert event, used to distinguish device for which
+    no device check event to OSPM was issued.
+    It's valid only when bit 1 is set.
+  2:
+    Device remove event, used to distinguish device for which
+    no device eject request to OSPM was issued.
+  3-7:
+    reserved and should be ignored by OSPM
+
+[0x15-0x17]
+  reserved
+
+Write access behavior
+^^^^^^^^^^^^^^^^^^^^^
+
+
+[0x0-0x3]
+  Memory device slot selector, selects active memory device.
+  All following accesses to other registers in 0xa00-0xa17
+  region will read/store data from/to selected memory device.
+[0x4-0x7]
+  OST event code reported by OSPM
+[0x8-0xb]
+  OST status code reported by OSPM
+[0xc-0x13]
+  reserved, writes into it are ignored
+[0x14]
+  Memory device control fields
+
+  bits:
+
+  0:
+    reserved, OSPM must clear it before writing to register.
+    Due to BUG in versions prior 2.4 that field isn't cleared
+    when other fields are written. Keep it reserved and don't
+    try to reuse it.
+  1:
+    if set to 1 clears device insert event, set by OSPM
+    after it has emitted device check event for the
+    selected memory device
+  2:
+    if set to 1 clears device remove event, set by OSPM
+    after it has emitted device eject request for the
+    selected memory device
+  3:
+    if set to 1 initiates device eject, set by OSPM when it
+    triggers memory device removal and calls _EJ0 method
+  4-7:
+    reserved, OSPM must clear them before writing to register
+
+Selecting memory device slot beyond present range has no effect on platform:
+
+- write accesses to memory hot-plug registers not documented above are ignored
+- read accesses to memory hot-plug registers not documented above return
+  all bits set to 1.
+
+Memory hot remove process diagram
+---------------------------------
+
+::
+
+   +-------------+     +-----------------------+      +------------------+
+   |  1. QEMU    |     | 2. QEMU               |      |3. QEMU           |
+   |  device_del +---->+ device unplug request +----->+Send SCI to guest,|
+   |             |     |         cb            |      |return control to |
+   |             |     |                       |      |management        |
+   +-------------+     +-----------------------+      +------------------+
+
+   +---------------------------------------------------------------------+
+
+   +---------------------+              +-------------------------+
+   | OSPM:               | remove event | OSPM:                   |
+   | send Eject Request, |              | Scan memory devices     |
+   | clear remove event  +<-------------+ for event flags         |
+   |                     |              |                         |
+   +---------------------+              +-------------------------+
+             |
+             |
+   +---------v--------+            +-----------------------+
+   | Guest OS:        |  success   | OSPM:                 |
+   | process Ejection +----------->+ Execute _EJ0 method,  |
+   | request          |            | set eject bit in flags|
+   +------------------+            +-----------------------+
+             |failure                         |
+             v                                v
+   +------------------------+      +-----------------------+
+   | OSPM:                  |      | QEMU:                 |
+   | set OST event & status |      | call device unplug cb |
+   | fields                 |      |                       |
+   +------------------------+      +-----------------------+
+            |                                  |
+            v                                  v
+   +------------------+              +-------------------+
+   |QEMU:             |              |QEMU:              |
+   |Send OST QMP event|              |Send device deleted|
+   |                  |              |QMP event          |
+   +------------------+              |                   |
+                                     +-------------------+

docs/specs/acpi_mem_hotplug.txt

@@ -1,94 +0,0 @@
-QEMU<->ACPI BIOS memory hotplug interface
---------------------------------------
-
-ACPI BIOS GPE.3 handler is dedicated for notifying OS about memory hot-add
-and hot-remove events.
-
-Memory hot-plug interface (IO port 0xa00-0xa17, 1-4 byte access):
----------------------------------------------------------------
-0xa00:
-  read access:
-      [0x0-0x3] Lo part of memory device phys address
-      [0x4-0x7] Hi part of memory device phys address
-      [0x8-0xb] Lo part of memory device size in bytes
-      [0xc-0xf] Hi part of memory device size in bytes
-      [0x10-0x13] Memory device proximity domain
-      [0x14] Memory device status fields
-          bits:
-              0: Device is enabled and may be used by guest
-              1: Device insert event, used to distinguish device for which
-                 no device check event to OSPM was issued.
-                 It's valid only when bit 1 is set.
-              2: Device remove event, used to distinguish device for which
-                 no device eject request to OSPM was issued.
-              3-7: reserved and should be ignored by OSPM
-      [0x15-0x17] reserved
-
-  write access:
-      [0x0-0x3] Memory device slot selector, selects active memory device.
-                All following accesses to other registers in 0xa00-0xa17
-                region will read/store data from/to selected memory device.
-      [0x4-0x7] OST event code reported by OSPM
-      [0x8-0xb] OST status code reported by OSPM
-      [0xc-0x13] reserved, writes into it are ignored
-      [0x14] Memory device control fields
-          bits:
-              0: reserved, OSPM must clear it before writing to register.
-                 Due to BUG in versions prior 2.4 that field isn't cleared
-                 when other fields are written. Keep it reserved and don't
-                 try to reuse it.
-              1: if set to 1 clears device insert event, set by OSPM
-                 after it has emitted device check event for the
-                 selected memory device
-              2: if set to 1 clears device remove event, set by OSPM
-                 after it has emitted device eject request for the
-                 selected memory device
-              3: if set to 1 initiates device eject, set by OSPM when it
-                 triggers memory device removal and calls _EJ0 method
-              4-7: reserved, OSPM must clear them before writing to register
-
-Selecting memory device slot beyond present range has no effect on platform:
-   - write accesses to memory hot-plug registers not documented above are
-     ignored
-   - read accesses to memory hot-plug registers not documented above return
-     all bits set to 1.
-
-Memory hot remove process diagram:
-----------------------------------
- +-------------+     +-----------------------+      +------------------+     
- |  1. QEMU    |     | 2. QEMU               |      |3. QEMU           |     
- |  device_del +---->+ device unplug request +----->+Send SCI to guest,|     
- |             |     |         cb            |      |return control to |     
- +-------------+     +-----------------------+      |management        |     
-                                                    +------------------+     
-                                                                             
- +---------------------------------------------------------------------+     
-                                                                             
- +---------------------+              +-------------------------+            
- | OSPM:               | remove event | OSPM:                   |            
- | send Eject Request, |              | Scan memory devices     |            
- | clear remove event  +<-------------+ for event flags         |            
- |                     |              |                         |            
- +---------------------+              +-------------------------+            
-           |                                                                 
-           |                                                                 
- +---------v--------+            +-----------------------+                   
- | Guest OS:        |  success   | OSPM:                 |                   
- | process Ejection +----------->+ Execute _EJ0 method,  |                   
- | request          |            | set eject bit in flags|                   
- +------------------+            +-----------------------+                   
-           |failure                         |                                
-           v                                v                                
- +------------------------+      +-----------------------+                   
- | OSPM:                  |      | QEMU:                 |                   
- | set OST event & status |      | call device unplug cb |                   
- | fields                 |      |                       |                   
- +------------------------+      +-----------------------+                   
-          |                                  |                               
-          v                                  v                               
- +------------------+              +-------------------+                     
- |QEMU:             |              |QEMU:              |                     
- |Send OST QMP event|              |Send device deleted|                     
- |                  |              |QMP event          |                     
- +------------------+              |                   |                     
-                                   +-------------------+

docs/specs/index.rst

@@ -14,3 +14,4 @@ guest hardware that is specific to QEMU.
    tpm
    acpi_hest_ghes
    acpi_cpu_hotplug
+   acpi_mem_hotplug