On Fri, Oct 23, 2020 at 10:48:14AM +0000, Ryan Moeller wrote: > Author: freqlabs > Date: Fri Oct 23 10:48:14 2020 > New Revision: 366965 > URL: https://svnweb.freebsd.org/changeset/base/366965 > > Log: > MFC r366771: > > bhyve: Update TX descriptor base address and host mapping on change > > bhyve sometimes segfaults when using an e1000 NIC with a Windows guest. > > We are only updating our tdba and cached host mapping when the low address > register is written and when tx is set enabled, but not when the high > address > or length registers are written. It is observed that Windows 10 is > occasionally > enabling tx first then writing the registers in the order low, high, len. > This > leaves us with a bogus base address and mapping, which causes a segfault > later > when we try to copy from a descriptor that has unpredictable garbage in a > pointer. > > Updating the address and mapping when any of those registers change seems > to fix > that particular issue.
Does this description mean that if guest writes garbage into base, it can crash monitor ? _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
