[GIT PULL] s390 updates for 5.12-rc6

[Heiko Carstens]

Hi Linus,

please pull a couple of small updates for s390.

Thanks,
Heiko

The following changes since commit 0d02ec6b3136c73c09e7859f0d0e4e2c4c07b49b:

  Linux 5.12-rc4 (2021-03-21 14:56:43 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git tags/s390-5.12-5

for you to fetch changes up to 84d572e634e28827d105746c922d8ada425e2d8b:

  MAINTAINERS: add backups for s390 vfio drivers (2021-03-28 20:20:33 +0200)

----------------------------------------------------------------
s390 updates for 5.12-rc6

- fix incorrect initialization and update of vdso data pages, which
  results in incorrect tod clock steering, and that
  clock_gettime(CLOCK_MONOTONIC_RAW, ...) returns incorrect values.

- update MAINTAINERS for s390 vfio drivers

----------------------------------------------------------------
Heiko Carstens (3):
      s390/vdso: copy tod_steering_delta value to vdso_data page
      s390/vdso: fix tod_steering_delta type
      s390/vdso: fix initializing and updating of vdso_data

Matthew Rosato (1):
      MAINTAINERS: add backups for s390 vfio drivers

 MAINTAINERS                       |  4 +++-
 arch/s390/include/asm/vdso/data.h |  2 +-
 arch/s390/kernel/time.c           | 10 ++++++++--
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/MAINTAINERS b/MAINTAINERS
index 9e876927c60d..68a562374b85 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15634,8 +15634,8 @@ F:	Documentation/s390/pci.rst
 
 S390 VFIO AP DRIVER
 M:	Tony Krowiak <akrowiak@xxxxxxxxxxxxx>
-M:	Pierre Morel <pmorel@xxxxxxxxxxxxx>
 M:	Halil Pasic <pasic@xxxxxxxxxxxxx>
+M:	Jason Herne <jjherne@xxxxxxxxxxxxx>
 L:	linux-s390@xxxxxxxxxxxxxxx
 S:	Supported
 W:	http://www.ibm.com/developerworks/linux/linux390/
@@ -15647,6 +15647,7 @@ F:	drivers/s390/crypto/vfio_ap_private.h
 S390 VFIO-CCW DRIVER
 M:	Cornelia Huck <cohuck@xxxxxxxxxx>
 M:	Eric Farman <farman@xxxxxxxxxxxxx>
+M:	Matthew Rosato <mjrosato@xxxxxxxxxxxxx>
 R:	Halil Pasic <pasic@xxxxxxxxxxxxx>
 L:	linux-s390@xxxxxxxxxxxxxxx
 L:	kvm@xxxxxxxxxxxxxxx
@@ -15657,6 +15658,7 @@ F:	include/uapi/linux/vfio_ccw.h
 
 S390 VFIO-PCI DRIVER
 M:	Matthew Rosato <mjrosato@xxxxxxxxxxxxx>
+M:	Eric Farman <farman@xxxxxxxxxxxxx>
 L:	linux-s390@xxxxxxxxxxxxxxx
 L:	kvm@xxxxxxxxxxxxxxx
 S:	Supported
diff --git a/arch/s390/include/asm/vdso/data.h b/arch/s390/include/asm/vdso/data.h
index 7b3cdb4a5f48..73ee89142666 100644
--- a/arch/s390/include/asm/vdso/data.h
+++ b/arch/s390/include/asm/vdso/data.h
@@ -6,7 +6,7 @@
 #include <vdso/datapage.h>
 
 struct arch_vdso_data {
-	__u64 tod_steering_delta;
+	__s64 tod_steering_delta;
 	__u64 tod_steering_end;
 };
 
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index 165da961f901..326cb8f75f58 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -80,10 +80,12 @@ void __init time_early_init(void)
 {
 	struct ptff_qto qto;
 	struct ptff_qui qui;
+	int cs;
 
 	/* Initialize TOD steering parameters */
 	tod_steering_end = tod_clock_base.tod;
-	vdso_data->arch_data.tod_steering_end = tod_steering_end;
+	for (cs = 0; cs < CS_BASES; cs++)
+		vdso_data[cs].arch_data.tod_steering_end = tod_steering_end;
 
 	if (!test_facility(28))
 		return;
@@ -366,6 +368,7 @@ static void clock_sync_global(unsigned long delta)
 {
 	unsigned long now, adj;
 	struct ptff_qto qto;
+	int cs;
 
 	/* Fixup the monotonic sched clock. */
 	tod_clock_base.eitod += delta;
@@ -381,7 +384,10 @@ static void clock_sync_global(unsigned long delta)
 		panic("TOD clock sync offset %li is too large to drift\n",
 		      tod_steering_delta);
 	tod_steering_end = now + (abs(tod_steering_delta) << 15);
-	vdso_data->arch_data.tod_steering_end = tod_steering_end;
+	for (cs = 0; cs < CS_BASES; cs++) {
+		vdso_data[cs].arch_data.tod_steering_end = tod_steering_end;
+		vdso_data[cs].arch_data.tod_steering_delta = tod_steering_delta;
+	}
 
 	/* Update LPAR offset. */
 	if (ptff_query(PTFF_QTO) && ptff(&qto, sizeof(qto), PTFF_QTO) == 0)