| |
|
 |
|
 |
|
|
|
| |
|
|
xen-devel
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
|
|
|
| |
|
Home