linux-toradex.git/arch/s390/tools, branch master

s390: Add Dat-Enhancement facility 1 to architecture level set

2025-11-06T13:12:30+00:00

Add the Dat-Enhancement facility 1 to the list of facilities which are
required to start the kernel. The facility provides the CSPG and IDTE
instructions. In particular the CSPG instruction can be used to replace a
valid page table entry with a different page table entry, which also
differs in the page frame real address.

Without the CSPG instruction it is possible to use the CSP instruction to
change valid page table entries, however it only allows to change the lower
or higher 32 bits of such entries, which means it cannot be used to change
the page frame real address of valid page table entries.

Given that there is code around (e.g. HugeTLB vmemmap optimization) which
requires to change valid page table entries of the kernel mapping, without
the detour over an invalid page table entry, make the CSPG instruction
unconditionally available.

The Dat-Enhancement facility 1 is available since z990, which is older than
the currently supported minimum architecture (z10). Therefore adding this
to the architecture level set shouldn't cause any problems.

Reviewed-by: Alexander Gordeev 
Reviewed-by: Claudio Imbrenda 
Signed-off-by: Heiko Carstens

s390: Allow to compile with z17 optimizations

2025-04-09T10:12:41+00:00

Add config and compile options which allow to compile with z17
optimizations if the compiler supports it. Add the
miscellaneous-instruction-extension 4 facility to the list of facilities
for z17.

Reviewed-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik 
Signed-off-by: Heiko Carstens

s390/tools: Use array instead of string initializer

2025-01-28T14:12:06+00:00

The in-kernel disassembler intentionally uses nun-null terminated
strings in order to keep the arrays which contain mnemonics as small
as possible. GCC 15 however warns about this:

./arch/s390/include/generated/asm/dis-defs.h:1662:71: error: initializer-string
 for array of ‘char’ is too long [-Werror=unterminated-string-initialization]
 1662 |         [1261] = { .opfrag = 0xea, .format = INSTR_SS_L0RDRD, .name = "unpka" }, \

Get rid of this warning by using array initializers.

Reviewed-by: Jens Remus 
Signed-off-by: Heiko Carstens 
Signed-off-by: Alexander Gordeev

KVM: s390: add gen17 facilities to CPU model

2024-11-11T12:07:51+00:00

Add gen17 facilities and let KVM_CAP_S390_VECTOR_REGISTERS handle
the enablement of the vector extension facilities.

Signed-off-by: Hendrik Brueckner 
Reviewed-by: Christian Borntraeger 
Link: https://lore.kernel.org/r/20241107152319.77816-4-brueckner@linux.ibm.com
Signed-off-by: Janosch Frank 
Message-ID: <20241107152319.77816-4-brueckner@linux.ibm.com>

KVM: s390: add concurrent-function facility to cpu model

2024-11-11T12:07:51+00:00

Adding support for concurrent-functions facility which provides
additional subfunctions.

Signed-off-by: Hendrik Brueckner 
Reviewed-by: Christian Borntraeger 
Link: https://lore.kernel.org/r/20241107152319.77816-2-brueckner@linux.ibm.com
Signed-off-by: Janosch Frank 
Message-ID: <20241107152319.77816-2-brueckner@linux.ibm.com>

Merge tag 's390-6.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

2024-09-21T16:02:54+00:00

Pull s390 updates from Vasily Gorbik:

 - Optimize ftrace and kprobes code patching and avoid stop machine for
   kprobes if sequential instruction fetching facility is available

 - Add hiperdispatch feature to dynamically adjust CPU capacity in
   vertical polarization to improve scheduling efficiency and overall
   performance. Also add infrastructure for handling warning track
   interrupts (WTI), allowing for graceful CPU preemption

 - Rework crypto code pkey module and split it into separate,
   independent modules for sysfs, PCKMO, CCA, and EP11, allowing modules
   to load only when the relevant hardware is available

 - Add hardware acceleration for HMAC modes and the full AES-XTS cipher,
   utilizing message-security assist extensions (MSA) 10 and 11. It
   introduces new shash implementations for HMAC-SHA224/256/384/512 and
   registers the hardware-accelerated AES-XTS cipher as the preferred
   option. Also add clear key token support

 - Add MSA 10 and 11 processor activity instrumentation counters to perf
   and update PAI Extension 1 NNPA counters

 - Cleanup cpu sampling facility code and rework debug/WARN_ON_ONCE
   statements

 - Add support for SHA3 performance enhancements introduced with MSA 12

 - Add support for the query authentication information feature of MSA
   13 and introduce the KDSA CPACF instruction. Provide query and query
   authentication information in sysfs, enabling tools like cpacfinfo to
   present this data in a human-readable form

 - Update kernel disassembler instructions

 - Always enable EXPOLINE_EXTERN if supported by the compiler to ensure
   kpatch compatibility

 - Add missing warning handling and relocated lowcore support to the
   early program check handler

 - Optimize ftrace_return_address() and avoid calling unwinder

 - Make modules use kernel ftrace trampolines

 - Strip relocs from the final vmlinux ELF file to make it roughly 2
   times smaller

 - Dump register contents and call trace for early crashes to the
   console

 - Generate ptdump address marker array dynamically

 - Fix rcu_sched stalls that might occur when adding or removing large
   amounts of pages at once to or from the CMM balloon

 - Fix deadlock caused by recursive lock of the AP bus scan mutex

 - Unify sync and async register save areas in entry code

 - Cleanup debug prints in crypto code

 - Various cleanup and sanitizing patches for the decompressor

 - Various small ftrace cleanups

* tag 's390-6.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (84 commits)
  s390/crypto: Display Query and Query Authentication Information in sysfs
  s390/crypto: Add Support for Query Authentication Information
  s390/crypto: Rework RRE and RRF CPACF inline functions
  s390/crypto: Add KDSA CPACF Instruction
  s390/disassembler: Remove duplicate instruction format RSY_RDRU
  s390/boot: Move boot_printk() code to own file
  s390/boot: Use boot_printk() instead of sclp_early_printk()
  s390/boot: Rename decompressor_printk() to boot_printk()
  s390/boot: Compile all files with the same march flag
  s390: Use MARCH_HAS_*_FEATURES defines
  s390: Provide MARCH_HAS_*_FEATURES defines
  s390/facility: Disable compile time optimization for decompressor code
  s390/boot: Increase minimum architecture to z10
  s390/als: Remove obsolete comment
  s390/sha3: Fix SHA3 selftests failures
  s390/pkey: Add AES xts and HMAC clear key token support
  s390/cpacf: Add MSA 10 and 11 new PCKMO functions
  s390/mm: Add cond_resched() to cmm_alloc/free_pages()
  s390/pai_ext: Update PAI extension 1 counters
  s390/pai_crypto: Add support for MSA 10 and 11 pai counters
  ...

s390/disassembler: Remove duplicate instruction format RSY_RDRU

2024-09-12T12:13:27+00:00

Instruction format RSY_RDRU is a duplicate of RSY_RURD2. Use the latter,
as it follows the s390-specific conventions for instruction format
naming used in binutils.

Reviewed-by: Heiko Carstens 
Signed-off-by: Jens Remus 
Signed-off-by: Vasily Gorbik

s390/disassembler: Add instructions

2024-08-29T20:56:33+00:00

Add more instructions to the kernel disassembler.

Reviewed-by: Jens Remus 
Reviewed-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/disassembler: Update instruction mnemonics to latest spec

2024-08-29T20:56:33+00:00

Over the course of CPU generations a few instructions got extended,
changing their base mnemonic, while keeping the former as an extended
mnemonic. Update the instruction mnemonics in the disassembler to their
latest base mnemonic as documented in the latest IBM z/Architecture
Principles of Operation specification [1].

With the IBM z14 the base mnemonics of the following vector instructions
have been changed:
- Vector FP Load Lengthened (VFLL)
- Vector FP Load Rounded (VFLR)

With Message-Security-Assist Extension 5 Perform Pseudorandom Number
Operation (PPNO) has been renamed to Perform Random Number Operation
(PRNO).

With Vector Enhancements Facility 2 the base mnemonics of the following
vector instructions have been changed:
- Vector FP Convert from Fixed (VCFPS)
- Vector FP Convert from Logical (VCFPL)
- Vector FP Convert to Fixed (VCSFP)
- Vector FP Convert to Logical (VCLFP)

[1] IBM z/Architecture Principles of Operation, SA22-7832-13, IBM z16,
    https://publibfp.dhe.ibm.com/epubs/pdf/a227832d.pdf

Acked-by: Vasily Gorbik 
Signed-off-by: Jens Remus 
Signed-off-by: Vasily Gorbik

s390/boot: Fix KASLR base offset off by __START_KERNEL bytes

2024-08-22T17:24:13+00:00

Symbol offsets to the KASLR base do not match symbol address in
the vmlinux image. That is the result of setting the KASLR base
to the beginning of .text section as result of an optimization.

Revert that optimization and allocate virtual memory for the
whole kernel image including __START_KERNEL bytes as per the
linker script. That allows keeping the semantics of the KASLR
base offset in sync with other architectures.

Rename __START_KERNEL to TEXT_OFFSET, since it represents the
offset of the .text section within the kernel image, rather than
a virtual address.

Still skip mapping TEXT_OFFSET bytes to save memory on pgtables
and provoke exceptions in case an attempt to access this area is
made, as no kernel symbol may reside there.

In case CONFIG_KASAN is enabled the location counter might exceed
the value of TEXT_OFFSET, while the decompressor linker script
forcefully resets it to TEXT_OFFSET, which leads to a sections
overlap link failure. Use MAX() expression to avoid that.

Reported-by: Omar Sandoval 
Closes: https://lore.kernel.org/linux-s390/ZnS8dycxhtXBZVky@telecaster.dhcp.thefacebook.com/
Fixes: 56b1069c40c7 ("s390/boot: Rework deployment of the kernel image")
Signed-off-by: Alexander Gordeev 
Acked-by: Vasily Gorbik 
Signed-off-by: Vasily Gorbik