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Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy()

From Ingo Molnar <mingo@kernel.org>
Newsgroups linux.kernel
Subject Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy()
Date 2016-02-18 21:20 +0100
Message-ID <r3Ddo-2wj-17@gated-at.bofh.it> (permalink)
References <r3f1n-1O1-3@gated-at.bofh.it> <r3f1p-1O1-45@gated-at.bofh.it> <r3Blf-16f-11@gated-at.bofh.it> <r3BXY-1pz-15@gated-at.bofh.it>
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* Luck, Tony <tony.luck@intel.com> wrote:

> On Thu, Feb 18, 2016 at 10:12:42AM -0800, Linus Torvalds wrote:
> > On Wed, Feb 17, 2016 at 10:20 AM, Tony Luck <tony.luck@intel.com> wrote:
> > >
> > > If we faulted during the copy, then 'trapnr' will say which type
> > > of trap (X86_TRAP_PF or X86_TRAP_MC) and 'remain' says how many
> > > bytes were not copied.
> > 
> > So apart from the naming, a couple of questions:
> > 
> >  - I'd like to see the actual *use* case explained, not just what it does.
> 
> First user is libnvdimm. Dan Williams already has code to use this so that 
> kernel code accessing persistent memory can return -EIO to a user instead of 
> crashing the system if the cpu runs into an uncorrected error during the copy.

Are these the memcpy_*_pmem() calls in drivers/nvdimm/pmem.c? Is there any actual 
patch to look at?

Thanks,

	Ingo

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[PATCH v11 0/4] Machine check recovery when kernel accesses poison Tony Luck <tony.luck@intel.com> - 2016-02-17 19:30 +0100
  [PATCH v11 4/4] x86: Create a new synthetic cpu capability for  machine check recovery Tony Luck <tony.luck@intel.com> - 2016-02-17 19:30 +0100
    [tip:x86/asm] x86/cpufeature:   Create a new synthetic cpu capability for machine check recovery tip-bot for Tony Luck <tipbot@zytor.com> - 2016-02-18 11:30 +0100
  [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() Tony Luck <tony.luck@intel.com> - 2016-02-17 19:30 +0100
    Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() Ingo Molnar <mingo@kernel.org> - 2016-02-18 09:30 +0100
      Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() Peter Zijlstra <peterz@infradead.org> - 2016-02-18 11:00 +0100
        Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() Borislav Petkov <bp@alien8.de> - 2016-02-18 11:30 +0100
        Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() Ingo Molnar <mingo@kernel.org> - 2016-02-18 11:30 +0100
          Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() Peter Zijlstra <peterz@infradead.org> - 2016-02-18 11:40 +0100
            RE: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() "Luck, Tony" <tony.luck@intel.com> - 2016-02-18 16:00 +0100
        Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() Ingo Molnar <mingo@kernel.org> - 2016-02-19 09:00 +0100
          Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() Peter Zijlstra <peterz@infradead.org> - 2016-02-19 09:50 +0100
            Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() Ingo Molnar <mingo@kernel.org> - 2016-02-19 11:00 +0100
      Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() Ingo Molnar <mingo@kernel.org> - 2016-02-18 11:40 +0100
        Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() Borislav Petkov <bp@alien8.de> - 2016-02-18 11:40 +0100
          Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() Ingo Molnar <mingo@kernel.org> - 2016-02-18 19:50 +0100
      Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() Borislav Petkov <bp@alien8.de> - 2016-02-18 11:40 +0100
      [PATCH v12] x86, mce: Add memcpy_trap() "Luck, Tony" <tony.luck@intel.com> - 2016-02-18 22:20 +0100
        Re: [PATCH v12] x86, mce: Add memcpy_trap() Ingo Molnar <mingo@kernel.org> - 2016-02-19 10:20 +0100
          Re: [PATCH v13] x86, mce: Add memcpy_trap() "Luck, Tony" <tony.luck@intel.com> - 2016-02-19 19:00 +0100
    Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() Linus Torvalds <torvalds@linux-foundation.org> - 2016-02-18 19:20 +0100
      Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() "Luck, Tony" <tony.luck@intel.com> - 2016-02-18 20:00 +0100
        Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() Ingo Molnar <mingo@kernel.org> - 2016-02-18 21:20 +0100
          Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() Dan Williams <dan.j.williams@intel.com> - 2016-02-18 22:40 +0100
      Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() Ingo Molnar <mingo@kernel.org> - 2016-02-18 20:00 +0100

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