From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:47341) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RYj5h-00089A-8Y for qemu-devel@nongnu.org; Thu, 08 Dec 2011 13:53:10 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RYj5g-0006Aa-6F for qemu-devel@nongnu.org; Thu, 08 Dec 2011 13:53:09 -0500 Received: from mx1.redhat.com ([209.132.183.28]:64615) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RYj5f-0006AM-EF for qemu-devel@nongnu.org; Thu, 08 Dec 2011 13:53:08 -0500 Date: Thu, 8 Dec 2011 16:52:58 -0200 From: Luiz Capitulino Message-ID: <20111208165258.17ab95f7@doriath> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: [Qemu-devel] [RFC] qemu-ga: Introduce guest-hibernate command List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel Cc: Amit Shah , mdroth@linux.vnet.ibm.com This is basically suspend to disk on a Linux guest. Signed-off-by: Luiz Capitulino --- This is an RFC because I did it as simple as possible and I'm open to suggestions... Now, while testing this or even "echo disk > /sys/power/state" I get several funny results. Some times qemu just dies after printing that message: "Guest moved used index from 20151 to 1" Some times it doesn't die, but I'm unable to log into the guest: I type username & password but the terminal kind of locks (the shell doesn't run). Some times it works... qapi-schema-guest.json | 11 +++++++++++ qga/guest-agent-commands.c | 19 +++++++++++++++++++ 2 files changed, 30 insertions(+), 0 deletions(-) diff --git a/qapi-schema-guest.json b/qapi-schema-guest.json index fde5971..2c5bbcf 100644 --- a/qapi-schema-guest.json +++ b/qapi-schema-guest.json @@ -215,3 +215,14 @@ ## { 'command': 'guest-fsfreeze-thaw', 'returns': 'int' } + +## +# @guest-hibernate +# +# Save RAM contents to disk and powerdown the guest. +# +# Notes: This command doesn't return on success. +# +# Since: 1.1 +## +{ 'command': 'guest-hibernate' } diff --git a/qga/guest-agent-commands.c b/qga/guest-agent-commands.c index 6da9904..9dd4060 100644 --- a/qga/guest-agent-commands.c +++ b/qga/guest-agent-commands.c @@ -550,6 +550,25 @@ int64_t qmp_guest_fsfreeze_thaw(Error **err) } #endif +#define LINUX_SYS_STATE_FILE "/sys/power/state" + +void qmp_guest_hibernate(Error **err) +{ + int fd; + + fd = open(LINUX_SYS_STATE_FILE, O_WRONLY); + if (fd < 0) { + error_set(err, QERR_OPEN_FILE_FAILED, LINUX_SYS_STATE_FILE); + return; + } + + if (write(fd, "disk", 4) < 0) { + error_set(err, QERR_UNDEFINED_ERROR); + } + + close(fd); +} + /* register init/cleanup routines for stateful command groups */ void ga_command_state_init(GAState *s, GACommandState *cs) { -- 1.7.8.110.g4cb5d1.dirty