[Qemu-devel] Re: [PATCH -v6] QEMU: MCE: Add MCE simulation to qemu/tcg

[Huang Ying]

On Wed, 2009-07-01 at 02:12 +0800, Anthony Liguori wrote:
> Hi Huang,
> 
> Huang Ying wrote:
> > - MCE features are initialized when VCPU is intialized according to CPUID.
> > - A monitor command "mce" is added to inject a MCE.
> > - A new interrupt mask: CPU_INTERRUPT_MCE is added to inject the MCE.
> >   
> 
> Can you post some instructions on how to test this functionality?  

During development, I use QEMU monitor command "mce" to test this
functionality. For corrected error, you can use /sbin/mcelog to get the
error information. For uncorrected error, you will get panic. If you
want to get result faster for corrected error, set the following sysfs
file to a small number, which is seconds between corrected error polls.
 
/sys/devices/system/machinecheck/machinecheck0/check_interval

For corrected error:

mce 0 1 0x8000000000000000 0x0 0x0 0x0

For uncorrected error:

mce 0 1 0xb200000000000000 0x0 0x0 0x0

> For 
> instance, I believe Linux is capable of delivering a SIGBUS to a process 
> based on certain MCE's.  I'm not sure what the steps would be though to 
> create a process using a particular physical memory address, generate a 
> MCE for that address, and then inspect that the process received the signal.
> 
> Are you testing the patches via something like that?

It is possible to test like that, but I think it is much easier to test
the case I mentioned above.

Best Regards,
Huang Ying