[PULL,4/5] qemu-options.hx: improve -m description
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Message ID 1425496415-6161-5-git-send-email-lcapitulino@redhat.com
State New
Headers show

Commit Message

Luiz Capitulino March 4, 2015, 7:13 p.m. UTC
Add memory hotplug options to the command-line format. Also,
add a complete command-line example and improve description.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Paulo Vital <paulo.vital@profitbricks.com>
 qemu-options.hx | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

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diff --git a/qemu-options.hx b/qemu-options.hx
index 85ca3ad..b0345ae 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -237,12 +237,24 @@  DEF("m", HAS_ARG, QEMU_OPTION_m,
     "NOTE: Some architectures might enforce a specific granularity\n",
-@item -m [size=]@var{megs}
+@item -m [size=]@var{megs}[,slots=n,maxmem=size]
 @findex -m
-Set virtual RAM size to @var{megs} megabytes. Default is 128 MiB.  Optionally,
-a suffix of ``M'' or ``G'' can be used to signify a value in megabytes or
-gigabytes respectively. Optional pair @var{slots}, @var{maxmem} could be used
-to set amount of hotluggable memory slots and possible maximum amount of memory.
+Sets guest startup RAM size to @var{megs} megabytes. Default is 128 MiB.
+Optionally, a suffix of ``M'' or ``G'' can be used to signify a value in
+megabytes or gigabytes respectively. Optional pair @var{slots}, @var{maxmem}
+could be used to set amount of hotpluggable memory slots and maximum amount of
+memory. Note that @var{maxmem} must be aligned to the page size.
+For example, the following command-line sets the guest startup RAM size to
+1GB, creates 3 slots to hotplug additional memory and sets the maximum
+memory the guest can reach to 4GB:
+qemu-system-x86_64 -m 1G,slots=3,maxmem=4G
+@end example
+If @var{slots} and @var{maxmem} are not specified, memory hotplug won't
+be enabled and the guest startup RAM will never increase.
 DEF("mem-path", HAS_ARG, QEMU_OPTION_mempath,