linux-kernel - Re: [PATCHV2 3/3] x86, ras: Add mcsafe_memcpy() function to recover from machine checks

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Date:	Fri, 11 Dec 2015 14:20:16 -0800
From:	Dan Williams <dan.j.williams@...el.com>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	linux-nvdimm <linux-nvdimm@...1.01.org>, X86 ML <x86@...nel.org>
Subject: Re: [PATCHV2 3/3] x86, ras: Add mcsafe_memcpy() function to recover
 from machine checks

On Fri, Dec 11, 2015 at 2:17 PM, Luck, Tony <tony.luck@...el.com> wrote:
>> Also, would it be more straightforward if the mcexception landing pad
>> looked up the va -> pa mapping by itself?  Or is that somehow not
>> reliable?
>
> If we did get all the above right, then we could have
> target use virt_to_phys() to convert to physical ...
> I don't see that this part would be a problem.

virt_to_phys() implies a linear address.  In the case of the use in
the pmem driver we'll be using an ioremap()'d address off somewherein
vmalloc space.
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