1. 06 May, 2015 1 commit
    • Jan H. Schönherr's avatar
      x86/smpboot: Skip delays during SMP initialization similar to Xen · f5d6a52f
      Jan H. Schönherr authored
      Remove the per-CPU delays during SMP initialization, which seems
      to be possible on newer architectures with an x2APIC.
      
      Xen does this since 2011. In fact, this commit is basically a
      combination of the following Xen commits. The first removes the
      delays, the second fixes an issue with the removal:
      
        commit 68fce206f6dba9981e8322269db49692c95ce250
        Author: Tim Deegan <Tim.Deegan@citrix.com>
        Date:   Tue Jul 19 14:13:01 2011 +0100
      
          x86: Remove timeouts from INIT-SIPI-SIPI sequence when using x2apic.
      
          Some of the timeouts are pointless since they're waiting for the ICR
          to ack the IPI delivery and that doesn't happen on x2apic.
          The others should be benign (and are suggested in the SDM) but
          removing them makes AP bringup much more reliable on some test boxes.
      Signed-off-by: default avatarTim Deegan <Tim.Deegan@citrix.com>
      
        commit f12ee533150761df5a7099c83f2a5fa6c07d1187
        Author: Gang Wei <gang.wei@intel.com>
        Date:   Thu Dec 29 10:07:54 2011 +0000
      
          X86: Add a delay between INIT & SIPIs for tboot AP bring-up in X2APIC case
      
          Without this delay, Xen could not bring APs up while working with
          TXT/tboot, because tboot needs some time in APs to handle INIT before
          becoming ready for receiving SIPIs (this delay was removed as part of
          c/s 23724 by Tim Deegan).
      Signed-off-by: default avatarGang Wei <gang.wei@intel.com>
      Acked-by: default avatarKeir Fraser <keir@xen.org>
      Acked-by: default avatarTim Deegan <tim@xen.org>
      Committed-by: default avatarTim Deegan <tim@xen.org>
      Signed-off-by: default avatarJan H. Schönherr <jschoenh@amazon.de>
      Cc: Anthony Liguori <aliguori@amazon.com>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Gang Wei <gang.wei@intel.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Len Brown <len.brown@intel.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Tim Deegan <tim@xen.org>
      Link: http://lkml.kernel.org/r/1430732554-7294-1-git-send-email-jschoenh@amazon.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      f5d6a52f
  2. 05 May, 2015 4 commits
  3. 24 Apr, 2015 35 commits