[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 0/12] Add S3 support to Xen
Hi, all, Attached patch set is the first support to S3 (suspend to ram) on Xen environment. We know that 3.0.5 is feature freeze now, and thus this version is just for trial and review first. X86-64 is to go (failed to compile), but we have a preliminary support in house which is however on an old version and not very stable yet. It's supposed to be out with next version. Totally 12 patches are attached. All files pulled from Linux are based on current xenlinux version (2.6.18). ====[Xen specific changes]==== [PATCH 1/12] Add suspend/resume to devices owned by Xen [PATCH 2/12] Pull necessary Linux PM files to Xen [PATCH 3/12] Provide basic Xen PM infrastructure [PATCH 4/12] PM interface between dom0 and Xen [PATCH 5/12] Add HVM support ====[Linux specific changes]==== [PATCH 6/12] Make kthreads freezable [PATCH 7/12] Pull Linux PM files to sparse tree [PATCH 8/12] Enable ACPI sleep in Linux ====[Xen SMP related changes]==== [PATCH 9/12] Pull Linux CPU hotplug logic to Xen [PATCH 10/12] Add Xen CPU hotplug support [PATCH 11/12] Allow vcpu to pause self (May not require, if force all cpus to sync lazy state) [PATCH 12/12] SMP support to Xen PM For each patch mail, we also post in the body for easy review, except those simply pulling Linux files. Thanks a lot to guidance from Jun Nakajima. ========================================= Some important notes are attached here, and it's better to read them carefully before you try it out, since Linux itself still has much thing to do with a stable PM support. #1. Ensure native linux (with same version as xenlinux) working on your environment first. Xen can never be more stable than native linux, thus please DO record all the information to make native Linux working stably, including kernel configuration changes, environmental setting, BIOS setting or any other tricky points you made. Then DO apply all these changes/settings to xen environment!!! #2. SATA driver suspend/resume was unstable in earlier linux version, which is said to have full support since 2.6.19. However in our side, SATA does work correctly if AHCI is disabled by configuring SATA as Enhanced/IDE mode for linux-2.6.18. If you see SATA failure unfortunately like "SATA: I/O request error", you have to switch to legacy IDE mode, and use traditional IDE drivers to operate disk. #3. VGA resume is the real boring issue, which may even crash the system on some boxes. The best case is that your BIOS support automatic VGA post after resume. If yes, congratulations! Or else, please read carefully linux-2.6.18/Documentation/power/video.txt, which lists some known workaround on some known types. Some supplements here: a) Xen also support "acpi_sleep=" option. You can add it to the xenlinux cmdline if applied. We just verified "acpi_sleep=s3_bios", which works on one box but failed another. "acpi_sleep=s3_mode" seems no effect on either box we have. b) On some boxes, VGA post have to be done in UP mode (For xen, it means UP-xenlinux), or else system may crash. S3_bios is a choice if applying to your box, since bios call is done in wakeup stub. Or else in case you have to use "vbetool post" from user space, one possible workaround is to manual unplug other cpus before suspend and re-plug them after VGA is resumed by: #echo "0" > /sys/devices/system/cpu/cpuN/online #echo "mem" > /sys/power/state ----After resume to user space---- #vbetool post ----Wait til VGA is fully resumed---- #echo "1" > /sys/devices/system/cpu/cpuN/online I guess such issue may be related to vm86 emulation under SMP, for both Xen and Linux. But not sure for now. :-( Just reiterative NOTE here, #2 and #3 both applies to native Linux and Xen. So MAKE SURE you have a STABLE native result first. It's better to run some workload when testing stability. For example, kernel build is easy to trigger instability when VGA resume method is incorrect. Thanks, Ke/Kevin _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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