On Tuesday, May 27, 2014 3:04:38 pm John Baldwin wrote: > Author: jhb > Date: Tue May 27 19:04:38 2014 > New Revision: 266765 > URL: http://svnweb.freebsd.org/changeset/base/266765 > > Log: > - Rework the XSAVE/XRSTOR emulation to only expose XCR0 features to the > guest for which the rules regarding xsetbv emulation are known. In > particular future extensions like AVX-512 have interdependencies among > feature bits that could allow a guest to trigger a GP# in the host with > the current approach of allowing anything the host supports. > - Add proper checking of Intel MPX and AVX-512 XSAVE features in the > xsetbv emulation and allow these features to be exposed to the guest if > they are enabled in the host. > - Expose a subset of known-safe features from leaf 0 of the structured > extended features to guests if they are supported on the host including > RDFSBASE/RDGSBASE, BMI1/2, AVX2, AVX-512, HLE, ERMS, and RTM. Aside > from AVX-512, these features are all new instructions available for use > in ring 3 with no additional hypervisor changes needed. > > Reviewed by: neel
Unfortunately there is no production silicon with either AVX-512 or MPX that runs FreeBSD AFAIK, so I haven't been able to test that this works correctly for those features. Using plain AVX in a guest still works ok though. -- John Baldwin _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
