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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

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Pull second set of s390 patches from Martin Schwidefsky:
 "The second part of Heikos uaccess rework, the page table walker for
  uaccess is now a thing of the past (yay!)

  The code change to fix the theoretical TLB flush problem allows us to
  add a TLB flush optimization for zEC12, this machine has new
  instructions that allow to do CPU local TLB flushes for single pages
  and for all pages of a specific address space.

  Plus the usual bug fixing and some more cleanup"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/uaccess: rework uaccess code - fix locking issues
  s390/mm,tlb: optimize TLB flushing for zEC12
  s390/mm,tlb: safeguard against speculative TLB creation
  s390/irq: Use defines for external interruption codes
  s390/irq: Add defines for external interruption codes
  s390/sclp: add timeout for queued requests
  kvm/s390: also set guest pages back to stable on kexec/kdump
  lcs: Add missing destroy_timer_on_stack()
  s390/tape: Add missing destroy_timer_on_stack()
  s390/tape: Use del_timer_sync()
  s390/3270: fix crash with multiple reset device requests
  s390/bitops,atomic: add missing memory barriers
  s390/zcrypt: add length check for aligned data to avoid overflow in msg-type 6
This commit is contained in:
Linus Torvalds
2014-04-08 12:02:28 -07:00
parent e9f37d3a8d 457f218095
commit d586c86d50
47 changed files with 1034 additions and 981 deletions
Download Patch File Download Diff File Expand all files Collapse all files

53
arch/s390/mm/fault.c
View File

@@ -106,21 +106,24 @@ void bust_spinlocks(int yes)
* Returns the address space associated with the fault.
* Returns 0 for kernel space and 1 for user space.
*/
static inline int user_space_fault(unsigned long trans_exc_code)
static inline int user_space_fault(struct pt_regs *regs)
{
unsigned long trans_exc_code;
/*
* The lowest two bits of the translation exception
* identification indicate which paging table was used.
*/
trans_exc_code &= 3;
if (trans_exc_code == 2)
/* Access via secondary space, set_fs setting decides */
trans_exc_code = regs->int_parm_long & 3;
if (trans_exc_code == 3) /* home space -> kernel */
return 0;
if (user_mode(regs))
return 1;
if (trans_exc_code == 2) /* secondary space -> set_fs */
return current->thread.mm_segment.ar4;
/*
* Access via primary space or access register is from user space
* and access via home space is from the kernel.
*/
return trans_exc_code != 3;
if (current->flags & PF_VCPU)
return 1;
return 0;
}
static inline void report_user_fault(struct pt_regs *regs, long signr)
@@ -172,7 +175,7 @@ static noinline void do_no_context(struct pt_regs *regs)
* terminate things with extreme prejudice.
*/
address = regs->int_parm_long & __FAIL_ADDR_MASK;
if (!user_space_fault(regs->int_parm_long))
if (!user_space_fault(regs))
printk(KERN_ALERT "Unable to handle kernel pointer dereference"
" at virtual kernel address %p\n", (void *)address);
else
@@ -296,7 +299,7 @@ static inline int do_exception(struct pt_regs *regs, int access)
* user context.
*/
fault = VM_FAULT_BADCONTEXT;
if (unlikely(!user_space_fault(trans_exc_code) || in_atomic() || !mm))
if (unlikely(!user_space_fault(regs) || in_atomic() || !mm))
goto out;
address = trans_exc_code & __FAIL_ADDR_MASK;
@@ -441,30 +444,6 @@ void __kprobes do_dat_exception(struct pt_regs *regs)
do_fault_error(regs, fault);
}
int __handle_fault(unsigned long uaddr, unsigned long pgm_int_code, int write)
{
struct pt_regs regs;
int access, fault;
/* Emulate a uaccess fault from kernel mode. */
regs.psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT | PSW_MASK_MCHECK;
if (!irqs_disabled())
regs.psw.mask |= PSW_MASK_IO | PSW_MASK_EXT;
regs.psw.addr = (unsigned long) __builtin_return_address(0);
regs.psw.addr |= PSW_ADDR_AMODE;
regs.int_code = pgm_int_code;
regs.int_parm_long = (uaddr & PAGE_MASK) | 2;
access = write ? VM_WRITE : VM_READ;
fault = do_exception(&regs, access);
/*
* Since the fault happened in kernel mode while performing a uaccess
* all we need to do now is emulating a fixup in case "fault" is not
* zero.
* For the calling uaccess functions this results always in -EFAULT.
*/
return fault ? -EFAULT : 0;
}
#ifdef CONFIG_PFAULT
/*
* 'pfault' pseudo page faults routines.
@@ -645,7 +624,7 @@ static int __init pfault_irq_init(void)
{
int rc;
rc = register_external_interrupt(0x2603, pfault_interrupt);
rc = register_external_irq(EXT_IRQ_CP_SERVICE, pfault_interrupt);
if (rc)
goto out_extint;
rc = pfault_init() == 0 ? 0 : -EOPNOTSUPP;
@@ -656,7 +635,7 @@ static int __init pfault_irq_init(void)
return 0;
out_pfault:
unregister_external_interrupt(0x2603, pfault_interrupt);
unregister_external_irq(EXT_IRQ_CP_SERVICE, pfault_interrupt);
out_extint:
pfault_disable = 1;
return rc;