PR/59424 CVS commit: src/sys/dev/nvmm/x86

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

The following reply was made to PR port-amd64/59424; it has been noted by GNATS.

From: "YAMAMOTO Takashi" <yamt%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/59424 CVS commit: src/sys/dev/nvmm/x86
Date: Wed, 27 May 2026 12:41:52 +0000

 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.