Re: [RFC][PATCH] tracing/x86: Save CR2 before tracing irqsoff on error_entry

[hpa]

On March 21, 2019 11:18:53 AM PDT, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>On Thu, Mar 21, 2019 at 11:05 AM Andy Lutomirski <luto@xxxxxxxxxxxxxx>
>wrote:
>>
>> In the long run, I think the right solution is to rewrite even more
>of
>> this mess in C.  We really ought to be able to put the IRQ flag
>> tracing and the context tracking into C code.
>
>Tangentially about this long run thing - can we start discussing just
>dropping PV mode entirely in the long run? Or even not-so-long run?
>
>What are the pressing advantages of paravirt these days? Because I can
>point to a lot of pressing _disadvantages_, and not all of them are
>about more complex code as shown by this patch...
>
>             Linus

God only knows how nice that would be (for things that aren't naturally driverized.) Last I heard, which was quite a while ago, the big problem was that the Amazon cloud runs Xen in PV mode...
-- 
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