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- Fix couple of late pt_regs flags handling findings of conversion to

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generic entry.
 
 - Fix potential register clobbering in stack switch helper.
 
 - Fix thread/group masks for offline cpus.
 
 - Fix cleanup of mdev resources when remove callback is invoked in vfio-ap
   code.
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Merge tag 's390-5.13-5' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 fixes from Vasily Gorbik:

 - Fix a couple of late pt_regs flags handling findings of conversion to
   generic entry.

 - Fix potential register clobbering in stack switch helper.

 - Fix thread/group masks for offline cpus.

 - Fix cleanup of mdev resources when remove callback is invoked in
   vfio-ap code.

* tag 's390-5.13-5' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/stack: fix possible register corruption with stack switch helper
  s390/topology: clear thread/group maps for offline cpus
  s390/vfio-ap: clean up mdev resources when remove callback invoked
  s390: clear pt_regs::flags on irq entry
  s390: fix system call restart with multiple signals
This commit is contained in:
Linus Torvalds 2021-06-26 09:50:10 -07:00
commit 625acffd7a
5 changed files with 21 additions and 21 deletions
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18
arch/s390/include/asm/stacktrace.h
View File

@ -91,12 +91,16 @@ struct stack_frame {
CALL_ARGS_4(arg1, arg2, arg3, arg4); \
register unsigned long r4 asm("6") = (unsigned long)(arg5)
#define CALL_FMT_0 "=&d" (r2) :
#define CALL_FMT_1 "+&d" (r2) :
#define CALL_FMT_2 CALL_FMT_1 "d" (r3),
#define CALL_FMT_3 CALL_FMT_2 "d" (r4),
#define CALL_FMT_4 CALL_FMT_3 "d" (r5),
#define CALL_FMT_5 CALL_FMT_4 "d" (r6),
/*
* To keep this simple mark register 2-6 as being changed (volatile)
* by the called function, even though register 6 is saved/nonvolatile.
*/
#define CALL_FMT_0 "=&d" (r2)
#define CALL_FMT_1 "+&d" (r2)
#define CALL_FMT_2 CALL_FMT_1, "+&d" (r3)
#define CALL_FMT_3 CALL_FMT_2, "+&d" (r4)
#define CALL_FMT_4 CALL_FMT_3, "+&d" (r5)
#define CALL_FMT_5 CALL_FMT_4, "+&d" (r6)
#define CALL_CLOBBER_5 "0", "1", "14", "cc", "memory"
#define CALL_CLOBBER_4 CALL_CLOBBER_5
@ -118,7 +122,7 @@ struct stack_frame {
" brasl 14,%[_fn]\n" \
" la 15,0(%[_prev])\n" \
: [_prev] "=&a" (prev), CALL_FMT_##nr \
[_stack] "R" (stack), \
: [_stack] "R" (stack), \
[_bc] "i" (offsetof(struct stack_frame, back_chain)), \
[_frame] "d" (frame), \
[_fn] "X" (fn) : CALL_CLOBBER_##nr); \

1
arch/s390/kernel/entry.S
View File

@ -418,6 +418,7 @@ ENTRY(\name)
xgr %r6,%r6
xgr %r7,%r7
xgr %r10,%r10
xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
stmg %r8,%r9,__PT_PSW(%r11)
tm %r8,0x0001 # coming from user space?

1
arch/s390/kernel/signal.c
View File

@ -512,7 +512,6 @@ void arch_do_signal_or_restart(struct pt_regs *regs, bool has_signal)
/* No handlers present - check for system call restart */
clear_pt_regs_flag(regs, PIF_SYSCALL);
clear_pt_regs_flag(regs, PIF_SYSCALL_RESTART);
if (current->thread.system_call) {
regs->int_code = current->thread.system_call;
switch (regs->gprs[2]) {

12
arch/s390/kernel/topology.c
View File

@ -66,7 +66,10 @@ static void cpu_group_map(cpumask_t *dst, struct mask_info *info, unsigned int c
{
static cpumask_t mask;
cpumask_copy(&mask, cpumask_of(cpu));
cpumask_clear(&mask);
if (!cpu_online(cpu))
goto out;
cpumask_set_cpu(cpu, &mask);
switch (topology_mode) {
case TOPOLOGY_MODE_HW:
while (info) {
@ -83,10 +86,10 @@ static void cpu_group_map(cpumask_t *dst, struct mask_info *info, unsigned int c
default:
fallthrough;
case TOPOLOGY_MODE_SINGLE:
cpumask_copy(&mask, cpumask_of(cpu));
break;
}
cpumask_and(&mask, &mask, cpu_online_mask);
out:
cpumask_copy(dst, &mask);
}
@ -95,7 +98,10 @@ static void cpu_thread_map(cpumask_t *dst, unsigned int cpu)
static cpumask_t mask;
int i;
cpumask_copy(&mask, cpumask_of(cpu));
cpumask_clear(&mask);
if (!cpu_online(cpu))
goto out;
cpumask_set_cpu(cpu, &mask);
if (topology_mode != TOPOLOGY_MODE_HW)
goto out;
cpu -= cpu % (smp_cpu_mtid + 1);

10
drivers/s390/crypto/vfio_ap_ops.c
View File

@ -366,16 +366,6 @@ static int vfio_ap_mdev_remove(struct mdev_device *mdev)
struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
mutex_lock(&matrix_dev->lock);
/*
* If the KVM pointer is in flux or the guest is running, disallow
* un-assignment of control domain.
*/
if (matrix_mdev->kvm_busy || matrix_mdev->kvm) {
mutex_unlock(&matrix_dev->lock);
return -EBUSY;
}
vfio_ap_mdev_reset_queues(mdev);
list_del(&matrix_mdev->node);
kfree(matrix_mdev);