Hi,
On 14.07.2016 11:02, Dube, Swaraj wrote:
Hi,
Sounds like a good idea, firstly Valentine has a good point I also think there
is something wrong with the I/O port access (if not then something else in the
I/O) so I changed debug_console.phys_start points from 0x3f8 to 0x3e8 in my
configs/myboard.c and then make again to obtain a new myboard.cell file as I am
using ttyS2 (I checked this in my /boot/EFI/BOOT/grub.cfg) and it's standard
address is 0x3e8 but is that it?, I think I may have to change something else
in myboard.c but I am unsure of what to change if any.
I turned CPU 1 offline and tried enabling jailhouse and I get an Invalid
argument error for JAILHOUSE_ENABLE obviously due to the return of -EINVAL from
jailhouse_cmd_enable() function from driver/main.c due to the if conditions set
but still no hypervisor output, I just see the printf(); messages I manually
created, I then read about the article contributed by valentine on
understanding the jailhouse hypervisor: https://lwn.net/Articles/578295/ that
explains about the role of the functions and how calls are made. I realize that
my program is not entering the entry(); or init_early(); function in
hypervisor/setup.c file as this is the file which seems to be printing out the
hypervisor output , may be the system is crashing before that ? , may be the
information about the IO in configs/myboard.c still incorrect (my suspect) ,
Any suggestions?
If having debug port wrong is really the culprit, check your BIOS/UEFI.
Often you may view/change I/O ports for COMx there.
Valentine
Regards,
Swaraj Dube.
-----Original Message-----
From: Jan Kiszka [mailto:jan.kis...@siemens.com]
Sent: Wednesday, July 13, 2016 11:15 PM
To: Dube, Swaraj <swaraj.d...@intel.com>; Valentine Sinitsyn
<valentine.sinit...@gmail.com>; Jailhouse <jailhouse-dev@googlegroups.com>
Subject: Re: ioctl function not completing and hypervisor output
On 2016-07-13 18:07, Dube, Swaraj wrote:
Hi,
Thanks for the reply, I think what you are referring to is the COM right , I
read about it, COM1-4 having I/O port addresses 0x3f8 , 0x2f8 , 0x3e8 and 0x2e8
respectively . Currently debug_console.phys_start in my configs/myboard.c
points to the address 0x3f8 which should be of standard COM1 whereas I am using
COM5 so I'll try finding the address of COM5, hope I am getting it right,
kindly correct me if I am getting it wrong.
If you want to debug the UART output of Jailhouse without crashing your system
every time: Take one of the configured cores offline (echo 0 >
/sys/devices/system/cpu/cpu1/online) before calling jailhouse enable.
That will make the hypervisor fail gracefully with -EINVAL, but you will see
messages of it trying to enable the remaining CPUs - provided we do not crash
even earlier in the setup.
Jan
--
Siemens AG, Corporate Technology, CT RDA ITP SES-DE Corporate Competence Center
Embedded Linux
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