CVS commit: src/sys/dev/nvmm/x86

["YAMAMOTO Takashi" <yamt%netbsd.org@localhost>]

Module Name:    src
Committed By:   yamt
Date:           Wed May 27 12:41:52 UTC 2026

Modified Files:
        src/sys/dev/nvmm/x86: nvmm_x86_svm.c nvmm_x86_vmx.c

Log Message:
nvmm: remove cpuid leaf 0x40000010

* given the lapic bit disabled, (PR/59424) [1]
  this leaf doesn't seem to have much benefit anymore.
  as nvmm is used in other platforms, (dragonfly bsd)
  it's better to avoid guest ABI changes without clear benefits.

* I couldn't find any documenation about what RBX=0 means.
  (vmware or kvm)

we can revisit this when/if someone comes up with a better
implementation. (probably userland-assisted one)

discussed on source-changes-d. [2]
reviewed by Taylor R Campbell.

[1] https://mail-index.netbsd.org/source-changes/2026/05/01/msg161786.html
[2] https://mail-index.netbsd.org/source-changes-d/2026/05/01/msg014654.html


To generate a diff of this commit:
cvs rdiff -u -r1.94 -r1.95 src/sys/dev/nvmm/x86/nvmm_x86_svm.c \
    src/sys/dev/nvmm/x86/nvmm_x86_vmx.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.