Re: [Qemu-devel] [RFC PATCH v6 00/20] replay additions

[Pavel Dovgalyuk]

Then I added SCSI adapter with the option –device lsi,id=scsi0 and QEMU failed 
with the following error:

qemu: fatal: IO on conditional branch instruction

 

It happens here:

static void arm_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)

{

    DisasContext *dc = container_of(dcbase, DisasContext, base);

 

    if (tb_cflags(dc->base.tb) & CF_LAST_IO && dc->condjmp) {

        /* FIXME: This can theoretically happen with self-modifying code. */

        cpu_abort(cpu, "IO on conditional branch instruction");

    }

 

Seems, that your kernel is incomatible with QEMU, which ARM emulation is not 
good enough.

 

Pavel Dovgalyuk

 

From: Pavel Dovgalyuk [mailto:address@hidden 
Sent: Tuesday, February 13, 2018 12:58 PM
To: 'Ciro Santilli'
Cc: 'Pavel Dovgalyuk'; address@hidden; address@hidden; 'Peter Maydell'; 
address@hidden; 'Igor R'; address@hidden; address@hidden; address@hidden; 
'Aleksandr Bezzubikov'; address@hidden; address@hidden; 'Thomas Dullien'; 
address@hidden; 'Alex Bennée'
Subject: RE: [RFC PATCH v6 00/20] replay additions

 

There is the same file I downloaded this morning. 

Now I re-checked everything and it prints the following error: qemu-system-arm: 
-device scsi-hd,drive=img-blkreplay: No 'SCSI' bus found for device 'scsi-hd'

 

Pavel Dovgalyuk

 

From: Ciro Santilli [mailto:address@hidden 
Sent: Tuesday, February 13, 2018 12:07 PM
To: Pavel Dovgalyuk
Cc: Pavel Dovgalyuk; address@hidden; address@hidden; Peter Maydell; 
address@hidden; Igor R; address@hidden; address@hidden; address@hidden; 
Aleksandr Bezzubikov; address@hidden; address@hidden; Thomas Dullien; 
address@hidden; Alex Bennée
Subject: Re: [RFC PATCH v6 00/20] replay additions

 

 

 

On Tue, Feb 13, 2018 at 6:50 AM, Pavel Dovgalyuk <address@hidden> wrote:

Your command line looks wrong, because you forgot –icount, but specified other 
replay options

 

Sorry about that, my full command is exactly the previous but with -icount 
'shift=7,rr=record,rrfile=replay.bin' added to the end.

 

.

I tried recording and replaying with your command line and the execution hangs 
at some moment of replay.

The problem may be hidden in –dtb option, because it may add the devices 
without configuring replay for them.

Can you specify the whole hardware configuration in the command line?

 

Ah, now that you mentioned this, I had a modification on the DTB which needed 
to be reverted. I have re-uploaded it to the same address: 
https://github.com/cirosantilli/linux-kernel-module-cheat/releases/download/test-replay-arm/images.zip
 please use the new one instead.

 

Now it should be just the vanilla Linux kernel versatilepb one.

 

How to specify the --dtb configuration explicitly on the command line? I have 
also included the dts on the zip if that helps.

 

 

Pavel Dovgalyuk

 

From: Ciro Santilli [mailto:address@hidden 
Sent: Tuesday, February 13, 2018 8:58 AM
To: Pavel Dovgalyuk
Cc: Pavel Dovgalyuk; address@hidden; address@hidden; Peter Maydell; 
address@hidden; Igor R; address@hidden; address@hidden; address@hidden; 
Aleksandr Bezzubikov; address@hidden; address@hidden; Thomas Dullien; 
address@hidden; Alex Bennée
Subject: Re: [RFC PATCH v6 00/20] replay additions

 

 

 

On Mon, Feb 12, 2018 at 5:47 AM, Pavel Dovgalyuk <address@hidden> wrote:

I tested ARM only with –kernel and –initrd.

Can you provide the full command line and the disk image?

 

 

The command I tried was:

 

time ./buildroot/output.arm~/host/usr/bin/qemu-system-arm -M versatilepb 
-append 'root=/dev/sda nokaslr norandmaps printk.devkmsg=on printk.time=y - 
lkmc_eval="/rand_check.out;wget -S google.com;/poweroff.out;"' -kernel 
./buildroot/output.arm~/images/zImage -dtb 
./buildroot/output.arm~/images/versatile-pb.dtb -nographic -drive 
file=./buildroot/output.arm~/images/rootfs.ext2,if=scsi,id=img-direct,format=raw
 -drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay -device 
scsi-hd,drive=img-blkreplay -netdev user,id=net1 -device rtl8139,netdev=net1 
-object filter-replay,id=replay,netdev=net1 

 

and the required files can be downloaded from:

 

https://github.com/cirosantilli/linux-kernel-module-cheat/releases/download/test-replay-arm/images.zip

 

They were generated with:

 

./build -a arm

 

on that repo.

 

 

Pavel Dovgalyuk

 

From: Ciro Santilli [mailto:address@hidden 
Sent: Saturday, February 10, 2018 3:09 AM
To: Pavel Dovgalyuk
Cc: Pavel Dovgalyuk; address@hidden; address@hidden; Peter Maydell; 
address@hidden; Igor R; address@hidden; address@hidden; address@hidden; 
Aleksandr Bezzubikov; address@hidden; address@hidden; Thomas Dullien; 
address@hidden; Alex Bennée
Subject: Re: [RFC PATCH v6 00/20] replay additions

 

Also, what command do you use to test on ARM? I'm a bit stuck to get the drive 
part right, e.g.:

 

-drive 
file=./buildroot/output.arm~/images/rootfs.ext2,if=scsi,id=img-direct,format=raw
 \

-drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay \

-device scsi-hd,drive=img-blkreplay \

 

fails with: qemu-system-arm: -device scsi-hd,drive=img-blkreplay: Conflicts 
with use by img-direct as 'root', which does not allow 'write' on #block968