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authorIgor Mammedov <imammedo@redhat.com>2018-05-11 19:24:43 +0200
committerEduardo Habkost <ehabkost@redhat.com>2018-05-30 13:19:14 -0300
commit047f7038f586d2150f16c6d9ba9cfd0479f0f6ac (patch)
treea330df8c7e3930d4edf457dc0a8db9366931653b /qemu-options.hx
parent7b13f2c27a02499e9f8d955e0a4c68a5165e150d (diff)
cli: add --preconfig option
This option allows pausing QEMU in the new RUN_STATE_PRECONFIG state, allowing the configuration of QEMU from QMP before the machine jumps into board initialization code of machine_run_board_init() The intent is to allow management to query machine state and additionally configure it using previous query results within one QEMU instance (i.e. eliminate the need to start QEMU twice, 1st to query board specific parameters and 2nd for actual VM start using query results for additional parameters). The new option complements -S option and could be used with or without it. The difference is that -S pauses QEMU when the machine is completely initialized with all devices wired up and ready to execute guest code (QEMU needs only to unpause VCPUs to let guest execute its code), while the "preconfig" option pauses QEMU early before board specific init callback (machine_run_board_init) is executed and allows the configuration of machine parameters which will be used by board init code. When early introspection/configuration is done, command 'exit-preconfig' should be used to exit RUN_STATE_PRECONFIG and transition to the next requested state (i.e. if -S is used then QEMU will pause the second time when board/device initialization is completed or start guest execution if -S isn't provided on CLI) PS: Initially 'preconfig' is planned to be used for configuring numa topology depending on board specified possible cpus layout. Signed-off-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <1526059483-42847-1-git-send-email-imammedo@redhat.com> [ehabkost: Changed "since 2.13" to "since 3.0"] Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Diffstat (limited to 'qemu-options.hx')
-rw-r--r--qemu-options.hx13
1 files changed, 13 insertions, 0 deletions
diff --git a/qemu-options.hx b/qemu-options.hx
index abbfa6ae9e..2f61ea42ee 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -3299,6 +3299,19 @@ STEXI
Run the emulation in single step mode.
ETEXI
+DEF("preconfig", 0, QEMU_OPTION_preconfig, \
+ "--preconfig pause QEMU before machine is initialized\n",
+ QEMU_ARCH_ALL)
+STEXI
+@item --preconfig
+@findex --preconfig
+Pause QEMU for interactive configuration before the machine is created,
+which allows querying and configuring properties that will affect
+machine initialization. Use the QMP command 'exit-preconfig' to exit
+the preconfig state and move to the next state (ie. run guest if -S
+isn't used or pause the second time if -S is used).
+ETEXI
+
DEF("S", 0, QEMU_OPTION_S, \
"-S freeze CPU at startup (use 'c' to start execution)\n",
QEMU_ARCH_ALL)