acpi: cpuhp: spec: clarify store into 'Command data' when 'Command field' == 0

Write section of 'Command data' register should describe what happens
when it's written into. Correct description in case the last stored
'Command field' value is equal to 0, to reflect that currently it's not
supported.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <1575896942-331151-7-git-send-email-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/docs/specs/acpi_cpu_hotplug.txt b/docs/specs/acpi_cpu_hotplug.txt
index d5108720bfce7cd80630fd5914c9f3f2f59273b7..8fb9ad22e6eb929ece161cbc71a30772af3cda76 100644 (file)
--- a/docs/specs/acpi_cpu_hotplug.txt
+++ b/docs/specs/acpi_cpu_hotplug.txt
@@ -90,8 +90,7 @@ write access:
             other values: reserved
     [0x6-0x7] reserved
     [0x8] Command data: (DWORD access)
-          current 'Command field' value:
-              0: OSPM reads value of CPU selector
+          if last stored 'Command field' value:
               1: stores value into OST event register
               2: stores value into OST status register, triggers
                  ACPI_DEVICE_OST QMP event from QEMU to external applications