.. is out of sync on i386 and x86-64 - should it be allowed on i386, or should it be suppressed on x86-64? Since Xen fails ill accesses, I would assume enabling it on i386 is fine. Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
On 30/5/07 10:52, "Jan Beulich" <jbeulich@novell.com> wrote:> .. is out of sync on i386 and x86-64 - should it be allowed on i386, or should > it be suppressed on x86-64? Since Xen fails ill accesses, I would assume > enabling it on i386 is fine.Is this the MSRs-from-userland option? Should be safe to enable. But probably fairly pointless? -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
>>> Keir Fraser <keir@xensource.com> 30.05.07 11:53 >>> >On 30/5/07 10:52, "Jan Beulich" <jbeulich@novell.com> wrote: > >> .. is out of sync on i386 and x86-64 - should it be allowed on i386, or should >> it be suppressed on x86-64? Since Xen fails ill accesses, I would assume >> enabling it on i386 is fine. > >Is this the MSRs-from-userland option? Should be safe to enable.Yes.>But probably fairly pointless?Not so for debugging purposes - I asked because I just now needed it to read a BIOS-initialized MSR, and it''s quite handy if you don''t have to reboot into a native kernel to do just this. Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
> -----Original Message----- > From: xen-devel-bounces@lists.xensource.com > [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of > Jan Beulich > Sent: 30 May 2007 11:03 > To: Keir Fraser > Cc: xen-devel@lists.xensource.com > Subject: Re: [Xen-devel] linux'' X86_MSR config option > > >>> Keir Fraser <keir@xensource.com> 30.05.07 11:53 >>> > >On 30/5/07 10:52, "Jan Beulich" <jbeulich@novell.com> wrote: > > > >> .. is out of sync on i386 and x86-64 - should it be > allowed on i386, or should > >> it be suppressed on x86-64? Since Xen fails ill accesses, > I would assume > >> enabling it on i386 is fine. > > > >Is this the MSRs-from-userland option? Should be safe to enable. > > Yes. > > >But probably fairly pointless? > > Not so for debugging purposes - I asked because I just now > needed it to read > a BIOS-initialized MSR, and it''s quite handy if you don''t > have to reboot into a > native kernel to do just this.I''m looking at something similar: A tool that can say if SVM is enabled/available or not, to be run in Dom0 or before installing Xen. The same method (directly or indirectly) could also be used by high-level tools to determine if it''s viable to install/create HVM virtual machines. This would certainly be "read only" accesses, as there''s nothing much that can be done if SVM is disabled by BIOS. -- Mats> > Jan > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel > > >_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
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