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Tue, 7 Jan 2020 23:36:35 +0000 (UTC) Received: from EX13D01UWB001.ant.amazon.com (10.43.161.75) by EX13MTAUWB001.ant.amazon.com (10.43.161.207) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:36:25 +0000 Received: from EX13MTAUWB001.ant.amazon.com (10.43.161.207) by EX13d01UWB001.ant.amazon.com (10.43.161.75) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:36:24 +0000 Received: from dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (172.22.96.68) by mail-relay.amazon.com (10.43.161.249) with Microsoft SMTP Server id 15.0.1367.3 via Frontend Transport; Tue, 7 Jan 2020 23:36:24 +0000 Received: by dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (Postfix, from userid 4335130) id D304340E0B; Tue, 7 Jan 2020 23:36:24 +0000 (UTC) Date: Tue, 7 Jan 2020 23:36:24 +0000 From: Anchal Agarwal To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [RFC PATCH V2 00/11] Enable PM hibernation on guest VMs Message-ID: <20200107233624.GA16802@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hello, I am sending out a V2 version of series of patches that implements guest PM hibernation. These guests are running on xen hypervisor. The patches had been tested against mainstream kernel. EC2 instance hibernation feature is provided to the AWS EC2 customers. PM hibernation uses swap space carved out within the guest[or can be a separate partition], where hibernation image is stored and restored from. Why is guest hibenration needed: Doing guest hibernation does not involve any support from hypervisor and this way guest has complete control over its state. Infrastructure restrictions like saving up guest state etc can be overcome by guest initiated hibernation. This series includes some improvements over RFC series sent last year: https://lists.xenproject.org/archives/html/xen-devel/2018-06/msg00823.html Any comments or suggestions are welcome. Changelog v2: 1. Removed timeout/request present on the ring in xen-blkfront during blkfront freeze 2. Fixed restoring of PIRQs which was apparently working for 4.9 kernels but not for newer kernel. [Legacy irqs were no longer restored after hibernation introduced with this commit "020db9d3c1dc0"] 3. Merged couple of related patches to make the code more coherent and readable 4. Code refactoring 5. Sched clock fix when hibernating guest is under heavy CPU load Note: Under very rare circumstances we see resume failures with KASLR enabled only on xen instances. We are roughly seeing 3% failures [>1000 runs] when testing with various instance sizes and some workload running on each instance. I am currently investigating the issue as to confirm if its a xen issue or kernel issue. However, it should not hold back anyone from reviewing/accepting these patches. Testing done: All the testing is done using amazon linux images w/t stock upstream kernel installed. All testing is done for multiple hibernation cycle. i. multiple loops[~100] of hibernation in disk mode w/t 5.4 guest kernel + 4.11 xen ii. Hibernation tested with memory stress tester running in background on smaller and larger instance sizes on EC2.[>500 runs] iii. Testing is also done on physical host machine[Ubuntu18.04/4.15 kernel/stock xen-4.6] running amazon linux 2 OS as guest VM with multiple queues. iv. Ran dd to write a large file with bs=1k and hibernated multiple times Testing How to: --------------- Example: Set up a file-backed swap space. Swap file size>=Total memory on the system sudo dd if=/dev/zero of=/swap bs=$(( 1024 * 1024 )) count=4096 # 4096MiB sudo chmod 600 /swap sudo mkswap /swap sudo swapon /swap Update resume device/resume offset in grub if using swap file: resume=/dev/xvda1 resume_offset=200704 Execute: -------- sudo pm-hibernate OR echo disk > /sys/power/state && echo reboot > /sys/power/disk Compute resume offset code: " #!/usr/bin/env python import sys import array import fcntl #swap file f = open(sys.argv[1], 'r') buf = array.array('L', [0]) #FIBMAP ret = fcntl.ioctl(f.fileno(), 0x01, buf) print buf[0] " Aleksei Besogonov (1): PM / hibernate: update the resume offset on SNAPSHOT_SET_SWAP_AREA Anchal Agarwal (2): x86/xen: Introduce new function to map HYPERVISOR_shared_info on Resume xen: Clear IRQD_IRQ_STARTED flag during shutdown PIRQs Eduardo Valentin (1): x86: tsc: avoid system instability in hibernation Munehisa Kamata (7): xen/manage: keep track of the on-going suspend mode xenbus: add freeze/thaw/restore callbacks support x86/xen: add system core suspend and resume callbacks xen-netfront: add callbacks for PM suspend and hibernation support xen-blkfront: add callbacks for PM suspend and hibernation x86/xen: save and restore steal clock during hibernation x86/xen: close event channels for PIRQs in system core suspend callback arch/x86/kernel/tsc.c | 29 ++++++++++ arch/x86/xen/enlighten_hvm.c | 8 +++ arch/x86/xen/suspend.c | 66 +++++++++++++++++++++ arch/x86/xen/time.c | 3 + arch/x86/xen/xen-ops.h | 1 + drivers/block/xen-blkfront.c | 119 +++++++++++++++++++++++++++++++++++--- drivers/net/xen-netfront.c | 98 ++++++++++++++++++++++++++++++- drivers/xen/events/events_base.c | 13 +++++ drivers/xen/manage.c | 73 +++++++++++++++++++++++ drivers/xen/time.c | 28 ++++++++- drivers/xen/xenbus/xenbus_probe.c | 99 +++++++++++++++++++++++++------ include/linux/irq.h | 1 + include/linux/sched/clock.h | 5 ++ include/xen/events.h | 1 + include/xen/xen-ops.h | 8 +++ include/xen/xenbus.h | 3 + kernel/irq/chip.c | 3 +- kernel/power/user.c | 6 +- kernel/sched/clock.c | 4 +- 19 files changed, 537 insertions(+), 31 deletions(-)