QEMU returns 0, in case of erro or invalid value in 'Command field',
make spec match reality, i.e.

Also fix returned value description  in case 'Command field' == 0x0,
it's in not PXM but CPU selector value with pending event

Signed-off-by: Igor Mammedov <imamm...@redhat.com>
---
 docs/specs/acpi_cpu_hotplug.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/docs/specs/acpi_cpu_hotplug.txt b/docs/specs/acpi_cpu_hotplug.txt
index ee219c8358..ac5903b2b1 100644
--- a/docs/specs/acpi_cpu_hotplug.txt
+++ b/docs/specs/acpi_cpu_hotplug.txt
@@ -44,9 +44,10 @@ read access:
            3-7: reserved and should be ignored by OSPM
     [0x5-0x7] reserved
     [0x8] Command data: (DWORD access)
-          in case of error or unsupported command reads is 0xFFFFFFFF
+          in case of error or unsupported command reads is 0x0
           current 'Command field' value:
-              0: returns PXM value corresponding to device
+              0: returns CPU selector value corresponding to a CPU with
+                 pending event.
 
 write access:
     offset:
-- 
2.18.1


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