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

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Date:	Thu, 12 Nov 2015 12:01:07 -0800
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
	linux-edac@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH 3/3] x86, ras: Add mcsafe_memcpy() function to recover
 from machine checks

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
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