[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] [PATCH][SVM] remove FFXSR CPUID bit for AMD-V HVM guests
>There is no known issue with FFSRX at this time, an alternative (that >works) is to modify the code in long_mode_do_msr_write() to not gp fault >on FFSRX bit being set (this was the original failure). > > if ( msr_content & ~(EFER_FFSRX | EFER_LME | EFER_LMA | EFER_NX >| EFER_SCE) ) > { > gdprintk(XENLOG_WARNING, "Trying to set reserved bit in " > "EFER: %"PRIx64"\n", msr_content); > goto gp_fault; > } > >The above code also allows windows to continue installation and function >seemingly properly. Then I'd favor this change over the posted one. >So, to answer your Q, there is not a particular known failure case for >3DNow! Or FFSRX disablement - the issue would be that there has been no >directed testing effort concerning 3DNow and FFSRX usages in the guest >to determine if would be any issues per se. For FFSRX, I can't see what issues you would expect. For 3dnow, it's as good (or as bad) as other MMX or XMM stuff trying to access MMIO, I would guess: if any of this is used anywhere, I guess some updates to emulation might be needed. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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