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

Ingo Molnar
2015-11-27T10:16:45Z

* Luck, Tony <tony.luck@intel.com> wrote:

> 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.

I see, that's sensible!

Thanks,

Ingo