Re: [PATCH] mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings of poison pages
From: Borislav Petkov
Date: Thu Jun 22 2017 - 05:39:34 EST
On Wed, Jun 21, 2017 at 10:47:40AM -0700, Luck, Tony wrote:
> I would if I could work out how to use it. From reading the manual
> page there seem to be a few options to this, but none of them appear
> to just drop a specific address (apart from my own). :-(
$ git send-email --to ... --cc ... --cc ... --suppress-cc=all ...
That should send only to the ones you have in --to and --cc and suppress
$ git send-email -v --dry-run --to ... --cc ... --cc ... --suppress-cc=all ...
to see what it is going to do.
> I'd assume that other X86 implementations would face similar issues (unless
> they have extremely cautious pre-fetchers and/or no speculation).
> I'm also assuming that non-X86 architectures that do recovery may want this
> too ... hence hooking the arch_unmap_kpfn() function into the generic
> memory_failure() code.
Which means that you could move the function to generic
mm/memory_failure.c code after making the decoy_addr computation
I'd still like to hear some sort of confirmation from other
vendors/arches whether it makes sense for them too, though.
I mean, if they don't do speculative accesses, then it probably doesn't
matter even - the page is innacessible anyway but still...
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