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[Qemu-devel] Some linux kernel with KAISER/KPTI patch can't work under q
From: |
lepton |
Subject: |
[Qemu-devel] Some linux kernel with KAISER/KPTI patch can't work under qemu + haxm. |
Date: |
Thu, 4 Jan 2018 14:08:57 -0800 |
It seems for some reason, some linux kernel with KAISER/KPTI patch can't
work with qemu + haxm.
The mainline kernel from Linus is fine. But the patch to 4.4/4.10 doesn't
work.
I am not familiar with HAXM and KPTI either. so not sure if this is a qemu
bug or KPTI bug or haxm bug.
The same kernel works fine under qemu + kvm.
This is the way to reproduce it:
1. Download qemu for windows, follow instructions here:
https://www.qemu.org/2017/11/22/haxm-usage-windows/
2. Build a kernel with KAISER/KPTI, I am using kernel here:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/log/?h=linux-4.4.y
Or follow instruction here to build a 4.10 kernel:
https://github.com/IAIK/KAISER/tree/master/KAISER
3. Build an ext2 image which has a simple init:
dd of=img count=8192 bs=4096 if=/dev/zero
mke2fs img
gcc --static -o init init.c
debugfs -R "write init init" -w img
cat init.c
#include <stdio.h>
#include <time.h>
int main()
{
while(1) {
printf("This is init %d\n", time(NULL));
sleep(3600);
}
}
4. copy kernel and disk image generated from 3 to windows and run it:
qemu-system-x86_64.exe -kernel bzImage -hda img -append "init=/init
root=/dev/sda" -serial stdio -accel hax
You will see kernel panic or "vpu shutdown reqeust" to qemu.
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