Re: [PATCH 3/3] x86, ras: Add mcsafe_memcpy() function to recover from machine checks

Luck, Tony
2015-11-12T20:01:09Z

On Thu, Nov 12, 2015 at 08:53:13AM +0100, Ingo Molnar wrote:
> > +extern phys_addr_t mcsafe_memcpy(void *dst, const void __user *src,
> > + unsigned size);
>
> So what's the longer term purpose, where will mcsafe_memcpy() be used?

The initial plan is to use this for file systems backed by NVDIMMs. They
will have a large amount of memory, and we have a practical recovery
path - return -EIO just like legacy h/w.

We can look for other places in the kernel where we read large amounts
of memory and have some idea how to recover if the memory turns out to
be bad.

-Tony