27a60aeb62
AMD has a separate guest CPL field, because on AMD, the SYSCALL/SYSRET instructions do not force SS.DPL to predefined values. On Intel they do, so the CPL on Intel is just the guest's SS.DPL value. Even though technically possible on AMD, there is no sane reason for a guest kernel to set a non-three SS.DPL, doing that would mess up several common segmentation practices and wouldn't be compatible with Intel. So, force the Intel behavior on AMD, by always setting SS.DPL<=>CPL. Remove the now unused CPL field from nvmm_x64_state::misc[]. This actually increases performance on AMD: to detect interrupt windows the virtualizer has to modify some fields of misc[], and because CPL was there, we had to flush the SEG set of the VMCB cache. Now there is no flush necessary. While here remove the CPL check for XSETBV on Intel, contrary to AMD Intel checks the CPL before the intercept, so if we receive an XSETBV VMEXIT, we are certain that it was executed at CPL=0 in the guest. By the way my check was wrong in the first place, it was reading SS.RPL instead of SS.DPL. |
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| bin | ||
| common | ||
| compat | ||
| crypto | ||
| dist/pf | ||
| distrib | ||
| doc | ||
| etc | ||
| external | ||
| extsrc | ||
| games | ||
| include | ||
| lib | ||
| libexec | ||
| regress | ||
| rescue | ||
| sbin | ||
| share | ||
| sys | ||
| tests | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| build.sh | ||
| BUILDING | ||
| Makefile | ||
| Makefile.inc | ||
| README.md | ||
| UPDATING | ||
NetBSD
NetBSD is a free, fast, secure, and highly portable Unix-like Open Source operating system. It is available for a wide range of platforms, from large-scale servers and powerful desktop systems to handheld and embedded devices.
Building
You can cross-build NetBSD from most UNIX-like operating systems. To build for amd64 (x86_64), in the src directory:
./build.sh -U -u -j4 -m amd64 -O ~/obj release
Additional build information available in the BUILDING file.
Binaries
Testing
On a running NetBSD system:
cd /usr/tests; atf-run | atf-report
Troubleshooting
- Send bugs and patches via web form.
- Subscribe to the mailing lists. The netbsd-users list is a good choice for many problems; watch current-users if you follow the bleeding edge of NetBSD-current.
- Join the community IRC channel #netbsd @ freenode.
Latest sources
To fetch the main CVS repository:
cvs -d anoncvs@anoncvs.NetBSD.org:/cvsroot checkout -P src
To work in the Git mirror, which is updated every few hours from CVS:
git clone https://github.com/NetBSD/src.git