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Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 asm updates from Ingo Molnar:
 "This is another big update. Main changes are:

   - lots of x86 system call (and other traps/exceptions) entry code
     enhancements.  In particular the complex parts of the 64-bit entry
     code have been migrated to C code as well, and a number of dusty
     corners have been refreshed.  (Andy Lutomirski)

   - vDSO special mapping robustification and general cleanups (Andy
     Lutomirski)

   - cpufeature refactoring, cleanups and speedups (Borislav Petkov)

   - lots of other changes ..."

* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (64 commits)
  x86/cpufeature: Enable new AVX-512 features
  x86/entry/traps: Show unhandled signal for i386 in do_trap()
  x86/entry: Call enter_from_user_mode() with IRQs off
  x86/entry/32: Change INT80 to be an interrupt gate
  x86/entry: Improve system call entry comments
  x86/entry: Remove TIF_SINGLESTEP entry work
  x86/entry/32: Add and check a stack canary for the SYSENTER stack
  x86/entry/32: Simplify and fix up the SYSENTER stack #DB/NMI fixup
  x86/entry: Only allocate space for tss_struct::SYSENTER_stack if needed
  x86/entry: Vastly simplify SYSENTER TF (single-step) handling
  x86/entry/traps: Clear DR6 early in do_debug() and improve the comment
  x86/entry/traps: Clear TIF_BLOCKSTEP on all debug exceptions
  x86/entry/32: Restore FLAGS on SYSEXIT
  x86/entry/32: Filter NT and speed up AC filtering in SYSENTER
  x86/entry/compat: In SYSENTER, sink AC clearing below the existing FLAGS test
  selftests/x86: In syscall_nt, test NT|TF as well
  x86/asm-offsets: Remove PARAVIRT_enabled
  x86/entry/32: Introduce and use X86_BUG_ESPFIX instead of paravirt_enabled
  uprobes: __create_xol_area() must nullify xol_mapping.fault
  x86/cpufeature: Create a new synthetic cpu capability for machine check recovery
  ...
This commit is contained in:
Linus Torvalds
2016-03-15 09:32:27 -07:00
parent e23604edac d050049442
commit ba33ea811e
105 changed files with 2011 additions and 1233 deletions
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39
arch/x86/kernel/cpu/common.c
View File

@@ -800,6 +800,31 @@ static void detect_nopl(struct cpuinfo_x86 *c)
clear_cpu_cap(c, X86_FEATURE_NOPL);
#else
set_cpu_cap(c, X86_FEATURE_NOPL);
#endif
/*
* ESPFIX is a strange bug. All real CPUs have it. Paravirt
* systems that run Linux at CPL > 0 may or may not have the
* issue, but, even if they have the issue, there's absolutely
* nothing we can do about it because we can't use the real IRET
* instruction.
*
* NB: For the time being, only 32-bit kernels support
* X86_BUG_ESPFIX as such. 64-bit kernels directly choose
* whether to apply espfix using paravirt hooks. If any
* non-paravirt system ever shows up that does *not* have the
* ESPFIX issue, we can change this.
*/
#ifdef CONFIG_X86_32
#ifdef CONFIG_PARAVIRT
do {
extern void native_iret(void);
if (pv_cpu_ops.iret == native_iret)
set_cpu_bug(c, X86_BUG_ESPFIX);
} while (0);
#else
set_cpu_bug(c, X86_BUG_ESPFIX);
#endif
#endif
}
@@ -1475,20 +1500,6 @@ void cpu_init(void)
}
#endif
#ifdef CONFIG_X86_DEBUG_STATIC_CPU_HAS
void warn_pre_alternatives(void)
{
WARN(1, "You're using static_cpu_has before alternatives have run!\n");
}
EXPORT_SYMBOL_GPL(warn_pre_alternatives);
#endif
inline bool __static_cpu_has_safe(u16 bit)
{
return boot_cpu_has(bit);
}
EXPORT_SYMBOL_GPL(__static_cpu_has_safe);
static void bsp_resume(void)
{
if (this_cpu->c_bsp_resume)