Re: [boot crash] Re: [tip:x86/mce3] x86, mce: use 64bit machine checkcode on 32bit

[Andi Kleen]

Hidetoshi Seto wrote:
> One possibility is: if the BIOS doesn't clear status in banks,
> new mce codes will try to log such junks.
> If the junk is totally junk but can be decoded as a valid log with
> MISCV or ADDRV bit, and if the cpu try to access register which is
> not implemented (e.g. IA32_MCi_MISC/ADDR), then such access might
> cause a general protection exception. (ref. ASDM 3A 15.3.2.3)

The MCA declares if it comes with ADDR or MISC in a status bit
and the MCA code only accesses these MSRs if these status bits are set.
Also I believe P3 implemented ADDR at least, likely even MISC.

The old 32bit MCA code did that too

-Andi
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/