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

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

Module Name:    src
Committed By:   maxv
Date:           Tue Sep  8 17:02:03 UTC 2020

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

Log Message:
nvmm-x86: avoid hogging behavior observed recently

When the FPU code got rewritten in NetBSD, the dependency on IPL_HIGH was
eliminated, and I took _vcpu_guest_fpu_enter() out of the VCPU loop since
there was no need to be in the splhigh window.

Later, the code was switched to use the kernel FPU API, API that works at
IPL_VM, not at IPL_NONE.

These two changes mean that the whole VCPU loop is now executing at IPL_VM,
which is not desired, because it introduces a delay in interrupt processing
on the host in certain cases.

Fix this by putting _vcpu_guest_fpu_enter() back inside the VCPU loop.


To generate a diff of this commit:
cvs rdiff -u -r1.80 -r1.81 src/sys/dev/nvmm/x86/nvmm_x86_svm.c
cvs rdiff -u -r1.79 -r1.80 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.