[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] mce_wrmsr() and (at least) HVM guests
>>> "Jan Beulich" <JBeulich@xxxxxxxxxx> 01.12.09 12:19 >>> >With mce_wrmsr() not permitting to write other than all zeroes or all ones >to MCG_CTL and MCn_CTL, it is not possible for guests to implement >workarounds (see the one in mce_cpu_quirks() which has been present in >Linux versions for a very long time). While one could expect PV guests to >be aware of that (and avoid the workaround), HVM guests clearly can't >be expected to. Thus the question is whether the handling should be >made a little more permissive. > >Initially I had thought of just making Xen check whether the bit(s) in >question are also off in the physical MSR, but that would imply that >Xen always has implemented at least all of the workarounds any guest >may know of. I'm not sure I have a good other idea, short of allowing >all writes to succeed. Ping? Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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