freebsd with flexible iflib nic queues
726f4773ec
EFER_NXE is set in the EFER MSR by initializecpu() and must be set on all CPUs in the system. When PG_NX support was added to PAE on i386, the block to enable EFER_NXE was placed in a section of initializecpu() that only runs if 'cpu == CPU_686'. During early boot, locore does an initial pass to set cpu that sets it to CPU_686 on all CPUs later than a Pentium. Later, printcpuinfo() adjusts the 'cpu' variable on PII and later CPUs to one of CPU_PII, CPU_PIII, or CPU_P4. However, printcpuinfo() is called after initializecpu() on the BSP, so the BSP would enable EFER_NXE and pg_nx. The APs execute initializecpu() much later after printcpuinfo() has run. The end result on a modern CPU was that cpu was set to CPU_PIII when the APs invoked initializecpu(), so they did not enable EFER_NXE. As a result, the APs would fault when trying to access any pages marked with PG_NX set. When booting a 2 CPU PAE kernel in bhyve this manifested as a hang before single user mode. The attempt to execute /bin/init tried to copy out the exec strings (argv, etc.) to a non-executable mapping while running on the AP. The instruction kept faulting due to invalid bits in the PTE in an infinite loop. Fix this by moving the code to enable EFER_NXE out of the switch statement on 'cpu' and always doing it if 'amd_feature' supports AMDID_NX. MFC after: 2 weeks |
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| bin | ||
| cddl | ||
| contrib | ||
| crypto | ||
| etc | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| targets | ||
| tests | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| .arcconfig | ||
| .arclint | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.libcompat | ||
| ObsoleteFiles.inc | ||
| README | ||
| UPDATING | ||
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7) and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html for more information, including setting make(1) variables. The `buildkernel` and `installkernel` targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel is a somewhat more involved process. See build(7), config(8), and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information. Note: If you want to build and install the kernel with the `buildkernel` and `installkernel` targets, you might need to build world before. More information is available in the handbook. The kernel configuration files reside in the sys/<arch>/conf sub-directory. GENERIC is the default configuration used in release builds. NOTES contains entries and documentation for all possible devices, not just those commonly used. Source Roadmap: --------------- bin System/user commands. cddl Various commands and libraries under the Common Development and Distribution License. contrib Packages contributed by 3rd parties. crypto Cryptography stuff (see crypto/README). etc Template files for /etc. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberos5 Kerberos5 (Heimdal) package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. rescue Build system for statically linked /rescue utilities. sbin System commands. secure Cryptographic libraries and commands. share Shared resources. sys Kernel sources. tests Regression tests which can be run by Kyua. See tests/README for additional information. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html