[PATCH] xen/Kconfig: Correct the NR_CPUS description

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

The description "physical CPUs" is especially wrong, as it implies the number
of sockets, which tops out at 8 on all but the very biggest servers.

NR_CPUS is the number of logical entities the scheduler can use.

Reported-by: hanetzer@xxxxxxxxxxxxx
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
CC: Wei Liu <wl@xxxxxxx>
CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
CC: Julien Grall <julien@xxxxxxx>
CC: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
CC: hanetzer@xxxxxxxxxxxxx
---
 xen/arch/Kconfig | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/xen/arch/Kconfig b/xen/arch/Kconfig
index 1954d1c5c1..d144d4c8d3 100644
--- a/xen/arch/Kconfig
+++ b/xen/arch/Kconfig
@@ -1,11 +1,17 @@
 
 config NR_CPUS
-       int "Maximum number of physical CPUs"
+       int "Maximum number of CPUs"
        range 1 4095
        default "256" if X86
        default "8" if ARM && RCAR3
        default "4" if ARM && QEMU
        default "4" if ARM && MPSOC
        default "128" if ARM
-       ---help---
-         Specifies the maximum number of physical CPUs which Xen will support.
+       help
+         Controls the build-time size of various arrays and bitmaps
+         associated with multiple-cpu management.  It is the upper bound of
+         the number of logical entities the scheduler can run code on.
+
+         For CPU cores which support Simultaneous Multi-Threading or similar
+         technologies, this the number of logical threads which Xen will
+         support.
-- 
2.11.0