Recent MFC to 7 causes crash on VMware ESXi
jhb at freebsd.org
Mon Feb 8 20:05:45 UTC 2010
On Monday 08 February 2010 2:46:51 pm Kostik Belousov wrote:
> On Mon, Feb 08, 2010 at 02:42:33PM -0500, John Baldwin wrote:
> > On Monday 08 February 2010 1:51:46 pm Kostik Belousov wrote:
> > > On Mon, Feb 08, 2010 at 01:15:06PM -0500, John Baldwin wrote:
> > > > > > I thought the old condition only happened under VMware?
> > > > >
> > > > > Reports I got where from XEN.
> > > >
> > > > Ok. Those would also be covered under the vm_guest test as it is
> > > > non-zero for Xen, VMware, Parallels, etc.
> > >
> > > What I said was suggestion and not objection. Ignore me.
> > Were there any reports of problems with Intel CPUs that weren't under a
> > virtualization system? If so, we should keep the test, but my understanding
> > was that the test was only true under specific virtualization environments.
> Forcing Intel CPU to use CLFLUSH, by clearing SS bit, caused
> reserved trap on Pentium M at least. My concern is that if Intel
> makes some stripped-down CPU with CLFLUSH but without SS logic,
> we would be affected.
Hmm, I am content to just workaround things that we know are broken for
enough. There are an infinite number of possibilities as far as if future
products may be broken. I think for that case we should wait and add a
workaround to disable it as new parts that are broken become available.
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