1. 13 Apr, 2016 26 commits
  2. 01 Apr, 2016 2 commits
    • Ingo Molnar's avatar
      x86/cpufeature: Fix build bug caused by merge artifact with the removal of cpu_has_hypervisor · d7847a70
      Ingo Molnar authored
      The 0-day build robot by Fengguang Wu reported a build failure:
      
         arch/x86/events//intel/cstate.c: In function 'cstate_pmu_init':
         arch/x86/events//intel/cstate.c:680:6: error: 'cpu_has_hypervisor' undeclared (first use in this function)
      
      ... which was caused by a merge mistake I made when applying
      the following patch:
      
        0c9f3536 ("x86/cpufeature: Remove cpu_has_hypervisor")
      
      apply the missing hunk as well.
      Reported-by: default avatarkbuild test robot <fengguang.wu@intel.com>
      Cc: David Kershner <david.kershner@unisys.com>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: sparmaintainer@unisys.com
      Cc: virtualization@lists.linux-foundation.org
      Link: http://lkml.kernel.org/r/1459266123-21878-3-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      d7847a70
    • Rusty Russell's avatar
      lguest, x86/entry/32: Fix handling of guest syscalls using interrupt gates · f87e0434
      Rusty Russell authored
      In a798f091 ("x86/entry/32: Change INT80 to be an interrupt gate")
      Andy broke lguest.  This is because lguest had special code to allow
      the 0x80 trap gate go straight into the guest itself; interrupts gates
      (without more work, as mentioned in the file's comments) bounce via
      the hypervisor.
      
      His change made them go via the hypervisor, but as it's in the range of
      normal hardware interrupts, they were not directed through to the guest
      at all.  Turns out the guest userspace isn't very effective if syscalls
      are all noops.
      
      I haven't ripped out all the now-useless trap-direct-to-guest-kernel
      code yet, since it will still be needed if someone decides to update
      this optimization.
      Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Weisbecker <fweisbec@gmail.com>
      Cc: x86\@kernel.org
      Link: http://lkml.kernel.org/r/87fuv685kl.fsf@rustcorp.com.auSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      f87e0434
  3. 31 Mar, 2016 12 commits