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On 07/21/2017 05:00 AM, [email protected] wrote:
> On Thursday, 20 July 2017 20:29:11 UTC+8, Patrik Hagara  wrote:
> 
>> On 07/20/2017 02:08 PM, Patrik Hagara wrote:
>>> As for the Linux kernel, you want to use the earlyprintk
>>> param, either "earlyprintk=vga,keep" or "earlyprintk=xen,keep"
>>> should work. Again, the full (and fairly long) list of
>>> supported parameters is available at this link [2].
>>> 
>>> The Linux early printk logging should yield some useful info, I
>>>  hope.
>> 
>> Also, removing the "quiet" option might be necessary. Try adding 
>> "nowatchdog panic=0" if the system reboots too quickly after
>> logging the errors.
> 
> Unfortunately, after doing all of this (and trying a few different
> variations), I still have the behaviour that the machine reboots
> immediately after SENTER.
> 
> From this I draw the conclusion that the kernel isn't even
> started.
> 
> What happens (or is supposed to happen) between SENTER and the
> kernel being loaded?

Xen should get loaded right after SENTER which then starts dom0 VM
with the Linux kernel + initramfs.

If there's no Xen logging at all... I'd try performing a TPM reset via
BIOS (there should be a TPM reset flag you can turn on and it will get
cleared during a few reboots after saving and exiting BIOS), then
shutting down the laptop, taking out battery and disconnecting AC,
waiting 30 seconds then putting battery back in, connecting AC power
and booting into BIOS again. Then reset the BIOS itself, performing
the same battery/power/waiting dance. After that enable the needed
options like Intel VT-d and TXT (as those will most likely get
disabled after BIOS reset), disabling EFI boot, then make sure to
completely turn off the laptop for at least 30 seconds again. Lastly,
take ownership of the TPM.

If it still doesn't work after this, I'm pretty much out of ideas...


Cheers,
Patrik
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