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Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit signal context

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On Mon, Oct 12, 2015 at 06:04:07PM -0700, Andy Lutomirski wrote:
...
> 
> For the benefit of new 64-bit software that uses segmentation (new
> versions of DOSEMU might), the new behavior can be detected with a
> new ucontext flag UC_SIGCONTEXT_SS.
> 
> To avoid compilation issues, __pad0 is left as an alias for ss in
> ucontext.
> 
> The nitty-gritty details are documented in the header file.
> 
> Cc: Stas Sergeev <stsp@list.ru>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Cyrill Gorcunov <gorcunov@gmail.com>
> Cc: Pavel Emelyanov <xemul@parallels.com>
> Signed-off-by: Andy Lutomirski <luto@kernel.org>

Andy, so for old criu versions (prior the 1.5.1 which is Mar 2015,
in next versions we already write proper ss into the images)
we've been providing __pad = 0, which is ss in a new meaning,
and the kernel will overwrite it with @user-ds after this series,
correct? This should work for us. Stas, mind to refresh my memory,
which ss value doesmu setups here?
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[RFC 0/4] x86: sigcontext SS fixes, take 2 Andy Lutomirski <luto@kernel.org> - 2015-10-13 03:10 +0200
  [RFC 4/4] selftests/x86: Add tests for UC_SIGCONTEXT_SS and UC_STRICT_RESTORE_SS Andy Lutomirski <luto@kernel.org> - 2015-10-13 03:10 +0200
  [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit signal context Andy Lutomirski <luto@kernel.org> - 2015-10-13 03:10 +0200
    Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Stas Sergeev <stsp@list.ru> - 2015-10-13 18:10 +0200
      Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Ingo Molnar <mingo@kernel.org> - 2015-10-14 17:10 +0200
        Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Stas Sergeev <stsp@list.ru> - 2015-10-14 17:20 +0200
      Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Andy Lutomirski <luto@amacapital.net> - 2015-10-14 18:50 +0200
        Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Stas Sergeev <stsp@list.ru> - 2015-10-14 19:50 +0200
          Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Andy Lutomirski <luto@amacapital.net> - 2015-10-14 20:10 +0200
            Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Stas Sergeev <stsp@list.ru> - 2015-10-14 20:40 +0200
              Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Andy Lutomirski <luto@amacapital.net> - 2015-10-14 21:00 +0200
                Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Stas Sergeev <stsp@list.ru> - 2015-10-14 23:40 +0200
                Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Andy Lutomirski <luto@amacapital.net> - 2015-10-14 23:50 +0200
    Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Cyrill Gorcunov <gorcunov@gmail.com> - 2015-10-14 18:50 +0200
      Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Andy Lutomirski <luto@amacapital.net> - 2015-10-14 18:50 +0200
        Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Cyrill Gorcunov <gorcunov@gmail.com> - 2015-10-14 19:00 +0200
      Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Stas Sergeev <stsp@list.ru> - 2015-10-14 19:00 +0200
        Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Cyrill Gorcunov <gorcunov@gmail.com> - 2015-10-14 19:10 +0200
  [RFC 2/4] x86/signal/64: Fix SS if needed when delivering a 64-bit signal Andy Lutomirski <luto@kernel.org> - 2015-10-13 03:10 +0200

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