Re: [tip:x86/urgent] x86, cpu, amd: Add workaround for family 16h, erratum 793

H. Peter Anvin
2014-01-15T13:52:22Z

On 01/15/2014 05:36 AM, Borislav Petkov wrote:
>>
>> msr_read() would essentially map to rdmsr_safe(). Each method has a
>> return value that can be checked for failure.
>
> I'm not sure we want to use the _safe() variants by default as it would
> generate the exception tables even in cases where they're clearly not
> needed.
>

It would be particularly silly if what you end up with is in effect to
wrap msr_read/write() in a BUG_ON(), which is the effect of the current
(trapping) form. There is something to be said for hard errors.

-hpa