Re: [kvm-devel] Suspending with kvm and kvm_loaded
Richard Hughes wrote: On Sun, 2007-06-17 at 11:10 +0300, Avi Kivity wrote: I posted a patchset which does just that, when the F kernel integrates it (through inclusion of 2.6.23 or by patching the current kernel), Fedora will be able to suspend/resume just fine. I've tried the current kvm kernel git tree and that failed to suspend with a running VM. Is there a different branch I should try? I've rebased the 'hotplug' branch. Please try it out. -- error compiling committee.c: too many arguments to function - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
Re: [kvm-devel] Suspending with kvm and kvm_loaded
On Tue, 2007-06-19 at 11:05 +0300, Avi Kivity wrote: Richard Hughes wrote: On Sun, 2007-06-17 at 11:10 +0300, Avi Kivity wrote: I posted a patchset which does just that, when the F kernel integrates it (through inclusion of 2.6.23 or by patching the current kernel), Fedora will be able to suspend/resume just fine. I've tried the current kvm kernel git tree and that failed to suspend with a running VM. Is there a different branch I should try? I've rebased the 'hotplug' branch. Please try it out. I actually extracted the patch set yesterday for the Fedora kernel and it's in today's rawhide kernel. Should be a good way to get some extra testing on it. In my quick trial run yesterday, it worked quite nicely! Jeremy - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
Re: [kvm-devel] Suspending with kvm and kvm_loaded
On Tue, 2007-06-19 at 08:33 -0400, Jeremy Katz wrote: On Tue, 2007-06-19 at 11:05 +0300, Avi Kivity wrote: Richard Hughes wrote: On Sun, 2007-06-17 at 11:10 +0300, Avi Kivity wrote: I posted a patchset which does just that, when the F kernel integrates it (through inclusion of 2.6.23 or by patching the current kernel), Fedora will be able to suspend/resume just fine. I've tried the current kvm kernel git tree and that failed to suspend with a running VM. Is there a different branch I should try? I've rebased the 'hotplug' branch. Please try it out. I actually extracted the patch set yesterday for the Fedora kernel and it's in today's rawhide kernel. Should be a good way to get some extra testing on it. In my quick trial run yesterday, it worked quite nicely! Yes, it works very well for me too. Thanks. Richard. - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
Re: [kvm-devel] Suspending with kvm and kvm_loaded
Richard Hughes wrote: On Sat, 2007-06-16 at 15:30 +0300, Muli Ben-Yehuda wrote: Is there any easy way we can detect if virtual machines are running? The module use counts will be elevanted and they'll refuse to unload (or there's a nasty bug somewhere). Nahh, that's too brutal. Is there a way to (hypothetically) read: # cat /sys/module/kvm/parameters/number_of_running_vms 2 Then if the user tries to suspend we can throw up a bubble saying Are you sure you want to suspend your computer with a running virtual machine? Why invest in workarounds when a fix is available? -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
Re: [kvm-devel] Suspending with kvm and kvm_loaded
On Sun, 2007-06-17 at 10:02 +0300, Avi Kivity wrote: Are you sure you want to suspend your computer with a running virtual machine? Why invest in workarounds when a fix is available? Totally agree. I was really looking for a proper fix, e.g. use libvirt to suspend the virtual machines before the machine is suspended (if any are running). Does anybod know why libvirt does not detect my running qemu VM (that uses KVM acceleration)? I get: Failed to connect to hypervisor Or is livirt XEN specific (!)? Richard. - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
Re: [kvm-devel] Suspending with kvm and kvm_loaded
Richard Hughes wrote: On Sun, 2007-06-17 at 10:02 +0300, Avi Kivity wrote: Are you sure you want to suspend your computer with a running virtual machine? Why invest in workarounds when a fix is available? Totally agree. I was really looking for a proper fix, e.g. use libvirt to suspend the virtual machines before the machine is suspended (if any are running). No no no. The proper fix will have suspend just working, whether or not a virtual machine is running or not. When you resume, the virtual machines continue running as if nothing had happened. I posted a patchset which does just that, when the F kernel integrates it (through inclusion of 2.6.23 or by patching the current kernel), Fedora will be able to suspend/resume just fine. Does anybod know why libvirt does not detect my running qemu VM (that uses KVM acceleration)? I get: Failed to connect to hypervisor If you start a virtual machine outside libvirt's knowledge, it won't pick it up. You also need to enable the libvirtd service (or however it is called). -- error compiling committee.c: too many arguments to function - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
Re: [kvm-devel] Suspending with kvm and kvm_loaded
On Sun, 2007-06-17 at 11:10 +0300, Avi Kivity wrote: No no no. The proper fix will have suspend just working, whether or not a virtual machine is running or not. When you resume, the virtual machines continue running as if nothing had happened. Ahh gotcha. In which case I apologize, I really don't follow kvm development very closely and didn't know this was even possible or planned. I posted a patchset which does just that, when the F kernel integrates it (through inclusion of 2.6.23 or by patching the current kernel), Fedora will be able to suspend/resume just fine. I think the latter is most likely, although if you have a link to the current patch I can push it in the way of davej and see what he says. Does anybod know why libvirt does not detect my running qemu VM (that uses KVM acceleration)? I get: If you start a virtual machine outside libvirt's knowledge, it won't pick it up. You also need to enable the libvirtd service (or however it is called). Ohh, I see. In which case I can ignore libvirt. Thanks! Richard. - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
Re: [kvm-devel] Suspending with kvm and kvm_loaded
Daniel Veillard wrote: Well if there were a way to discover running KVM instances and communicate with them, then we wouldn't need to keep a daemon as a parent process for libvirt access and control. It's a point I would love to see solved at the QEmu level, but it's not really urgent :-) You can set the qemu monitor socket to a unix domain socket in some well-known directory, and enumerate virtual machines by readdiring that directory and trying to connect. Of course that only works for qemu processes started by libvirt, not random qemu processes. (and I wish there was an SO_UNLINKONCLOSE option that could racelessly garbage collect those dead sockets) I still think having a daemon is a good idea; it can collect events generated by qemu and possibly act on them. -- error compiling committee.c: too many arguments to function - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
Re: [kvm-devel] Suspending with kvm and kvm_loaded
On Sun, 2007-06-17 at 11:10 +0300, Avi Kivity wrote: I posted a patchset which does just that, when the F kernel integrates it (through inclusion of 2.6.23 or by patching the current kernel), Fedora will be able to suspend/resume just fine. I've tried the current kvm kernel git tree and that failed to suspend with a running VM. Is there a different branch I should try? Richard. - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
Re: [kvm-devel] Suspending with kvm and kvm_loaded
Richard Hughes wrote: Hi, I'm getting lots of bug reports about installing kvm and then suspend breaking. Some background: when the fedora package kvm is installed, then the kvm and kvm_xxx modules get auto loaded at boot. To get the machine to suspend again, the modules have to be rmmod'd on suspend and then modprobe'd on resume. We can automate the rmmodding and modprobeing adding a simple script in pm-utils (/etc/pm/sleep.d/) on package install, but to avoid just bodging the issue I wanted to ask you guys first. * Is it safe to rmmod kvm and kvm_x before suspend? Yes, although you can't do that if you have any virtual machines running. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
Re: [kvm-devel] Suspending with kvm and kvm_loaded
On Sat, 2007-06-16 at 10:53 +0300, Avi Kivity wrote: Richard Hughes wrote: Hi, I'm getting lots of bug reports about installing kvm and then suspend breaking. Some background: when the fedora package kvm is installed, then the kvm and kvm_xxx modules get auto loaded at boot. To get the machine to suspend again, the modules have to be rmmod'd on suspend and then modprobe'd on resume. We can automate the rmmodding and modprobeing adding a simple script in pm-utils (/etc/pm/sleep.d/) on package install, but to avoid just bodging the issue I wanted to ask you guys first. * Is it safe to rmmod kvm and kvm_x before suspend? Yes, although you can't do that if you have any virtual machines running. Is there any easy way we can detect if virtual machines are running? Richard. - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
Re: [kvm-devel] Suspending with kvm and kvm_loaded
On Sat, Jun 16, 2007 at 11:29:34AM +0100, Richard Hughes wrote: Is there any easy way we can detect if virtual machines are running? The module use counts will be elevanted and they'll refuse to unload (or there's a nasty bug somewhere). Cheers, Muli - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
Re: [kvm-devel] Suspending with kvm and kvm_loaded
On Sat, 2007-06-16 at 15:30 +0300, Muli Ben-Yehuda wrote: Is there any easy way we can detect if virtual machines are running? The module use counts will be elevanted and they'll refuse to unload (or there's a nasty bug somewhere). Nahh, that's too brutal. Is there a way to (hypothetically) read: # cat /sys/module/kvm/parameters/number_of_running_vms 2 Then if the user tries to suspend we can throw up a bubble saying Are you sure you want to suspend your computer with a running virtual machine? Richard. - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
Re: [kvm-devel] Suspending with kvm and kvm_loaded
On 6/16/07, Richard Hughes [EMAIL PROTECTED] wrote: On Sat, 2007-06-16 at 15:30 +0300, Muli Ben-Yehuda wrote: Is there any easy way we can detect if virtual machines are running? The module use counts will be elevanted and they'll refuse to unload (or there's a nasty bug somewhere). Nahh, that's too brutal. Is there a way to (hypothetically) read: # cat /sys/module/kvm/parameters/number_of_running_vms 2 cat /sys/module/kvm_intel/refcnt (or kvm_amd) will tell you how many VMs are running. Luca - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
Re: [kvm-devel] Suspending with kvm and kvm_loaded
On Sat, Jun 16, 2007 at 07:36:18PM +0200, Luca wrote: On 6/16/07, Richard Hughes [EMAIL PROTECTED] wrote: On Sat, 2007-06-16 at 15:30 +0300, Muli Ben-Yehuda wrote: Is there any easy way we can detect if virtual machines are running? The module use counts will be elevanted and they'll refuse to unload (or there's a nasty bug somewhere). Nahh, that's too brutal. Is there a way to (hypothetically) read: # cat /sys/module/kvm/parameters/number_of_running_vms 2 cat /sys/module/kvm_intel/refcnt (or kvm_amd) will tell you how many VMs are running. ... were running at the moment when you queried the kernel. Once you get back the answer, it's irrelevant --- a new VM could've been launched inbetween reading the refcnt and acting upon it. Really the only safe way to do this sort of thing is to try and rmmod the module. Cheers, Muli - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
