Date: Tue, 24 Nov 2009 12:00:41 -0600 From: Kevin <kevin@your.org> To: freebsd-current@freebsd.org Subject: Re: 8.0 still doesn't boot in Xen (kern/138863) Message-ID: <AA89F9A5-9A79-4942-A450-5351713299C2@your.org> In-Reply-To: <3EA83F9F-BE44-4C64-852F-CDC09FB63B94@your.org> References: <3EA83F9F-BE44-4C64-852F-CDC09FB63B94@your.org>
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On Nov 24, 2009, at 11:20 AM, Kevin wrote: > > Is it too late in the 8.0 release schedule to look at kern/138863? > Between 7.x and 8.0 the kernel can no longer boot under Xen due to > changes involving CLFLUSH. The effect is a crash very early in the > boot, with no workaround. (This is under Xen's fully virtualized > mode, not the XEN platform port underway.) > > This was also mentioned on the Xen mailing lists back in September (http://lists.freebsd.org/pipermail/freebsd-xen/2009-September/000310.html > ) but nothing has been committed to fix this yet. > > XenServer is getting pretty popular in some enterprise and hosting > environments, so having 8.0 not bootable would be a bit > disappointing. :) I was just pointed to the change from a couple of days ago, adding the tunable "hw.clflush_disable". This looks like it might do what I need, so I'm building a new bootable CD to find out and update the PR. This should probably be documented somewhere, just so someone in a similar situation even knows about this tunable. -- Kevin
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