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

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

Module Name:    src
Committed By:   yamt
Date:           Sun Mar 22 09:29:55 UTC 2026

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

Log Message:
nvmm_x86_vmx.c: fixes tprof stalls

the current implementation of nvmm nmi handling is
simple; just drops them. it interferes other nmi-using
components in the system, including tprof.

this commit makes nvmm try to dispatch nmis by itself.
while this is imperfect, it's good enough to give
tprof a chance to unmask LAPIC_LVT_PCINT.

i guess svm VMCB_EXITCODE_NMI needs something similar.
but i have no hardware. if someone wants to test a patch,
please let me know.

reproduce recipe:
1. run "tprof top" in a terminal. leave it running.
2. run an nvmm-based vm in another terminal.
3. observe some cpus in the "tprof top" stopped counting.


To generate a diff of this commit:
cvs rdiff -u -r1.92 -r1.93 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.