CVS commit: src/sys/dev/nvmm

["Maxime Villard" <maxv%netbsd.org@localhost>]

Module Name:    src
Committed By:   maxv
Date:           Sun May 24 08:08:49 UTC 2020

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

Log Message:
Gather the conditions to return from the VCPU loops in nvmm_return_needed(),
and use it in nvmm_do_vcpu_run() as well. This fixes two undesired behaviors:

 - When a VM initializes, the many nested page faults that need processing
   could cause the calling thread to occupy the CPU too much if we're unlucky
   and are only getting repeated nested page faults thousands of times in a
   row.

 - When the emulator calls nvmm_vcpu_run() and immediately sends a signal to
   stop the VCPU, it's better to check signals earlier and leave right away,
   rather than doing a round of VCPU run that could increase the time spent
   by the emulator waiting for the return.


To generate a diff of this commit:
cvs rdiff -u -r1.29 -r1.30 src/sys/dev/nvmm/nvmm.c
cvs rdiff -u -r1.14 -r1.15 src/sys/dev/nvmm/nvmm_internal.h
cvs rdiff -u -r1.61 -r1.62 src/sys/dev/nvmm/x86/nvmm_x86_svm.c
cvs rdiff -u -r1.58 -r1.59 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.