Re: Running NetBSD-current under qemu-nvmm

[Piotr Meyer <aniou%smutek.pl@localhost>]

On Wed, Apr 17, 2019 at 01:13:50PM +0100, Chavdar Ivanov wrote:
[...]

> The problem I am having is with NetBSD-current, amd64. I am able to
> install it and run it with the default accelleration, which is
> obviously very slow (perhaps 20-30 times, I haven't measured). If I
> use nvmm, I consistently get a panic as follows:
> ....
>  Making device nodes ...
>  [ 141.4547199] fatal protection fault in supervisor mode
>  [ 141.4547199] trap type 4 code 0 rip 0xffffffff8021e0ea cs 0x8
> rflags 0x10246 cr2 0x7bcebdf892b0 ilevel 0x8 rsp 0xffff83802b513f98
>  [ 141.4547199] curlwp 0xfffff0e0f6350240 pid 118.1 lowest kstack
> 0xffff83802b5102c0
>  kernel: protection fault trap, code=0
>  Stopped in pid 118.1 (sh) at      netbsd:xrstor+0xa      [xsave]
> db{0}> bt
> xrstor() at netbsd:xrstor+xa
> cpu_switchto() at netbsd:cpu_switchto+0xb1
> db{0}>
> ....

I can confirm identical behaviour, although in my case panic starts
immediately after issuing any command (ls, dmesg) from shell called
from utility menu:

# ls
[  18.7037883] fatal protection fault in supervisor mode
[  18.7037883] trap type 4 code 0 rip 0xffffffff8021e0ea cs 0x8 rflags 0x10246 
cr2 0x7b3566556000 ilevel 0x8 rsp 0xffffb20032d32f98
[  18.7037883] curlwp 0xfffffdfebae57a60 pid 17.1 lowest 
kstack 0xffffb20032d2f2c0
kernel: protection fault trap, code=0
Stopped in pid 17.1 (sh) at     netbsd:xrstor+0xa:      fxsavel
db{0}> bt
xrstor() at netbsd:xrstor+0xa
cpu_switchto() at netbsd:cpu_switchto+0xb1
db{0}>

Host kernel:
NetBSD szpak.local 8.99.37 NetBSD 8.99.37 (GENERIC) #1: Fri Apr 19 19:53:45 CEST 2019  
aniou@szpak.local:/usr/obj/sys/arch/amd64/compile/GENERIC amd64

Guest:
NetBSD-current, booted from NetBSD-8.99.37-amd64.iso (2019-04-20)

Qemu parameters:
qemu-system-x86_64 \
     -netdev tap,id=n0,ifname=tap0,script=no,downscript=no \
     -device virtio-net-pci,netdev=n0 \
     -device virtio-scsi-pci \
     -drive file=/vm/test.qcow2.img,if=none,id=hd0,format=qcow2 \
     -device scsi-hd,drive=hd0 \
     -m 1024M \
     -k en-us \
     -accel nvmm \
     -display curses \
     -cdrom /home/aniou/Downloads/NetBSD-8.99.37-amd64.iso


-- 
Piotr 'aniou' Meyer