linux.git/arch/s390/kernel/setup.c, branch v3.18.74

s390: use correct input data address for setup_randomness

2017-04-18T05:55:53+00:00

commit 4920e3cf77347d7d7373552d4839e8d832321313 upstream.

The current implementation of setup_randomness uses the stack address
and therefore the pointer to the SYSIB 3.2.2 block as input data
address. Furthermore the length of the input data is the number of
virtual-machine description blocks which is typically one.

This means that typically a single zero byte is fed to
add_device_randomness.

Fix both of these and use the address of the first virtual machine
description block as input data address and also use the correct
length.

Fixes: bcfcbb6bae64 ("s390: add system information as device randomness")
Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky 
Signed-off-by: Greg Kroah-Hartman

s390: make setup_randomness work

2017-04-18T05:55:53+00:00

commit da8fd820f389a0e29080b14c61bf5cf1d8ef5ca1 upstream.

Commit bcfcbb6bae64 ("s390: add system information as device
randomness") intended to add some virtual machine specific information
to the randomness pool.

Unfortunately it uses the page allocator before it is ready to use. In
result the page allocator always returns NULL and the setup_randomness
function never adds anything to the randomness pool.

To fix this use memblock_alloc and memblock_free instead.

Fixes: bcfcbb6bae64 ("s390: add system information as device randomness")
Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky 
Signed-off-by: Greg Kroah-Hartman

s390: add support for vector extension

2014-10-09T07:14:13+00:00

The vector extension introduces 32 128-bit vector registers and a set of
instruction to operate on the vector registers.

The kernel can control the use of vector registers for the problem state
program with a bit in control register 0. Once enabled for a process the
kernel needs to retain the content of the vector registers on context
switch. The signal frame is extended to include the vector registers.
Two new register sets NT_S390_VXRS_LOW and NT_S390_VXRS_HIGH are added
to the regset interface for the debugger and core dumps.

Signed-off-by: Martin Schwidefsky

s390/setup: correct 4-level kernel page table detection

2014-09-26T10:22:42+00:00

Fix calculation to decide if a 4-level kernel page table is required.
Git commit c972cc60c23f5a63 "s390/vmalloc: have separate modules area"
added the separate module area which reduces the size of the vmalloc
area but fails to take it into account for the 3 vs 4 level page table
decision.

Signed-off-by: Martin Schwidefsky

s390: add system information as device randomness

2014-08-12T11:00:07+00:00

The virtual-machine cpu information data block and the cpu-id of
the boot cpu can be used as source of device randomness.

Signed-off-by: Martin Schwidefsky

s390/kdump: Return NOTIFY_OK for all actions other than MEM_GOING_OFFLINE

2014-07-22T07:26:20+00:00

We only have to check kdump memory for the MEM_GOING_OFFLINE action.
Therefore skip the test and return NOTIFY_OK for all other memory
hotplug actions.

Signed-off-by: Michael Holzheu 
Signed-off-by: Martin Schwidefsky

s390/dump: Remove CONFIG_ZFCPDUMP

2014-05-20T06:58:43+00:00

Currently there are two s390 kernel dump config options "CONFIG_ZFCPDUMP"
and "CONFIG_CRASH_DUMP". In order to keep things simple and because the
"CONFIG_ZFCPDUMP" option already has a dependency to "CONFIG_CRASH_DUMP"
remove the CONFIG_ZFCPDUMP option.

Signed-off-by: Michael Holzheu 
Reviewed-by: Eric Farman 
Signed-off-by: Martin Schwidefsky

s390/spinlock: optimize spinlock code sequence

2014-05-20T06:58:42+00:00

Use lowcore constant to improve the code generated for spinlocks.

[ Martin Schwidefsky: patch breakdown and code beautification ]

Signed-off-by: Philipp Hachtmann 
Signed-off-by: Martin Schwidefsky

s390/mm: Convert bootmem to memblock

2014-05-20T06:58:40+00:00

The original bootmem allocator is getting replaced by memblock. To
cover the needs of the s390 kdump implementation the physical memory
list is used.
With this patch the bootmem allocator and its bitmaps are completely
removed from s390.

Signed-off-by: Philipp Hachtmann 
Signed-off-by: Martin Schwidefsky

s390: add 31 bit warning message

2014-04-11T11:53:31+00:00

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky