[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] pv_ops dom0 and kernel console output problem
On Wed, Dec 31, 2008 at 09:44:52AM +1100, Jeremy Fitzhardinge wrote: > Pasi Kärkkäinen wrote: > >Reading pv_ops wiki page I noticed this: > > > >"If the domain crashes very early, before any output appears on the > >console, > >then booting with: "earlyprintk=xen" should provide some useful > >information. > >If you are running a debug build of Xen hypervisor (set "debug = y" in > >Config.mk in the Xen source tree), then you should get crash dumps on the > >Xen console. You can view those with "xm dmesg"." > > > >So I guess earlyprintk=xen is only useful if you're running debug build of > >Xen hypervisor.. ? > > earlyprintk=xen has the effect of directing the kernel's console output > via the console output hypercall. domU kernel's are not generally > allowed to do this, but it is when you compile Xen in debug mode. dom0, > however, uses the Xen console in the normal case, so it doesn't need a > debug Xen build. But when Xen switches its console output to serial the > kernel's output goes with it, so if you want it to appear on VGA you > need to use the VGA console output (make sure your kernel has all the VT > console options enabled). > Thanks for clearing that up! -- Pasi _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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