[tboot-devel] txt-acminfo report incorrect data if msr module is not loaded

[Timo L. <tim...@ik...>]

Hi,

while testing latest tboot with latest debian unstable I noticed that 
txt-acminfo reports "ACM does not match platform" for all ACM modules. It 
seems that this happens since /dev/cpu/0/msr does not exist by default in 
Debian. There is an error "Error: failed to open /dev/cpu/0/msr" but since 
txt-acminfo reports so much information this can easily be missed by a 
user. After I run "modprobe msr" txt-acminfo behaves normally again.

Could we make missing /dev/cpu/0/msr a fatal error that should suggest the 
user to run "modprobe msr"? In any case txt-acminfo should not report 
"ACM does not match platform" for a valid ACM file. It should report 
"Could not determine if ACM matches platform (maybe you need to modprobe 
msr)?" or something.

-Timo