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Sun, 24 May 2020 20:31:08 +0200 Date: Sun, 24 May 2020 20:30:59 +0200 From: Lukas Straub To: qemu-devel Subject: [PATCH v3 0/4] Introduce 'yank' oob qmp command to recover from hanging qemu Message-ID: MIME-Version: 1.0 X-Provags-ID: V03:K1:EnStaY6+bHA4oulLIZdgnkllxVSoMIKE2on4tthqgTIaFvsf3Dd pKPr3ONaW7FLgxETI6Bc4aAAbQ7n7F3ICRBBDe876UmRAoZJFR4L5siFhz8gQHeSDZvHavd PUavyBU/phVRSjfiyewTGrlREP28SbDNv/UvbdoRYN9XgAWsLYmTBPhI2xoNTXF2h5x9tcU cc1X4cz4C+P2GDVpFF51w== X-UI-Out-Filterresults: notjunk:1;V03:K0:2nRiBN4iS3E=:1JK3Jh8SBQOKoW2vWOWnpe yLITUioBqc1RoV/NTuA0USxDh/RNRAoeg60GDveV0KLi1r6YG6ZfRcUIgq3ghtQaxucrz2I5L M6OlTYYUgnKNahk7m0HIjKRl61McOgdErEEU7cX92fiZk3PUEldoTC/7a41ys8h3uTnphLWyo XzGZRQjb6V9rix7ENAN1V84tG23fV1+9Rvua1iQPeHS+QZCUeaDlqymE2EWWeR/8gxYOoHuE8 9I6t3FeGtXxLXTNKHYOvLrtdbTYP2+UwhYSilRS77F4fs3xZW2Dpz48LkhidgJkkS/BTn1mol rfJjAZAP6QuZjwSo1Hh0cHZxtm9mabemBDxptwN1vq6FA2xgh9pJ5D0fUjTeCOzTEXrswg4// zQ6IErrKM5/UsG3CzMnaVfat9c8tlrRFTTcr3FdMKE4UdMTVOz9QQt3c4DGSNkPTe0W2rJTlH ifTREyoov+h7vk6p22moOnJNm0tci3NsWVE54HlmlOtKQCPymwl6JgpE9OyrkPqkf0piAjggS dkP8VVlEvAKIJpe1A3GyfAAXmHkps1mWg2VOKpU7JO4C4INeoZinfIhzssoIfWXo/gtxmk0d0 DhD8Ktv0E+6Pc/Sm7a418UfiSlD0a5Q7fAApZR+NgOj4Vn9ifpTjGtdcwPdYboEZ11FLwhdyQ LfRF5xzoyxY04Cm43/fOK2/2AXgWznF6DM8zcJ/iyDRdFWRrx5N47GL+61blP8kz3CO7VyRvc SWG5CrM8Ntj6lH/ss/8N3s11zh0jGvL4ZWkpNbV4qn3ukhoxKaxK0+2cbKVEzxpNkVczxLs76 PRc/HgPl9hvPSwWDWlmIeWcDN6cUuPvACDQIJ0rTS70L7EEAUKxumSLh8gDEllQhMEEae1Uw6 rx1Gm71UhYdVbrUEAFG9WDPr2mHilPIKYLgkEudF/l2ttRbkx8N1yjSWcpJTeg3RbYW7dMcSo W1dbxdOihmlFj2xHzREHd1ktZG60K6ZemHsNxl6KHcqdCSWcPqnXcsAsB1N/n4B86qON0uTMk N8WohVt3v6kLyF2vdVsb3dvDtZzwoc1St2RdezcY4Rx9a1QiekI0lbben+9m7T49nsd5g7wXc 0XWJPUSG/XwNugSb1uFrg3ZARF44Y3LRvA/0dhTv9eJKPXsXAzq4Tq7uUduraEQg2hP5iHEm7 Pj+0IMNTgnQs/3fKRuAu+1iYsl7ETizcovrizFaJP2BKo3YQX+uy1rVVhYkJHT7W5hM8B6vdf /Rsnobed4LJqa+QPy Received-SPF: pass client-ip=212.227.17.12; envelope-from=lukasstraub2@web.de; helo=mout.web.de X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/24 14:31:12 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , "Daniel P. =?utf-8?b?QmVycmFuZ8Op?= " , qemu-block , Juan Quintela , "Dr. David Alan Gilbert" , Max Reitz , Paolo Bonzini , =?utf-8?q?Marc-Andr=C3=A9?= Lureau Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Hello Everyone, In many cases, if qemu has a network connection (qmp, migration, chardev, etc.) to some other server and that server dies or hangs, qemu hangs too. These patches introduce the new 'yank' out-of-band qmp command to recover from these kinds of hangs. The different subsystems register callbacks which get executed with the yank command. For example the callback can shutdown() a socket. This is intended for the colo use-case, but it can be used for other things too of course. Regards, Lukas Straub v3: -don't touch softmmu/vl.c, use __contructor__ attribute instead (Paolo Bonzini) -fix build errors -rewrite migration patch so it actually passes all tests v2: -don't touch io/ code anymore -always register yank functions -'yank' now takes a list of instances to yank -'query-yank' returns a list of yankable instances Lukas Straub (4): Introduce yank feature block/nbd.c: Add yank feature chardev/char-socket.c: Add yank feature migration: Add yank feature Makefile.objs | 3 + block/nbd.c | 101 ++++++++++++-------- chardev/char-socket.c | 24 +++++ migration/channel.c | 12 +++ migration/migration.c | 18 +++- migration/multifd.c | 10 ++ migration/qemu-file-channel.c | 6 ++ qapi/misc.json | 45 +++++++++ yank.c | 174 ++++++++++++++++++++++++++++++++++ yank.h | 67 +++++++++++++ 10 files changed, 422 insertions(+), 38 deletions(-) create mode 100644 yank.c create mode 100644 yank.h --- 2.20.1