kernel/linux.git/arch/s390/include/asm/facility.h, branch linux-7.0.y

s390/facilities: Fix warning about shadow of global variable

2024-10-10T13:32:43+00:00

Compiling the kernel with clang W=2 produces a warning that the parameter declarations in some routines would shadow the definition of the global variable stfle_fac_list. Address this warning by renaming the parameters to fac_list. Fixes: 17e89e1340a3 ("s390/facilities: move stfl information from lowcore to global data") Signed-off-by: Gerd Bayer Signed-off-by: Heiko Carstens

s390/facility: Let test_facility() generate static branch if possible

2024-09-13T15:28:36+00:00

Let test_facility() generate a branch instruction if the tested facility is a constant, and where the result cannot be evaluated during compile time. The branch instruction defaults to "false" and is patched to nop (branch not taken) if the tested facility is available. This avoids runtime checks and is similar to x86's static_cpu_has() and arm64's alternative_has_cap_likely(). Signed-off-by: Heiko Carstens Signed-off-by: Jason A. Donenfeld

s390/facility: Disable compile time optimization for decompressor code

2024-09-13T15:28:36+00:00

Disable compile time optimizations of test_facility() for the decompressor. The decompressor should not contain any optimized code depending on the architecture level set the kernel image is compiled for to avoid unexpected operation exceptions. Add a __DECOMPRESSOR check to test_facility() to enforce that facilities are always checked during runtime for the decompressor. Reviewed-by: Sven Schnelle Signed-off-by: Heiko Carstens Signed-off-by: Jason A. Donenfeld

s390/alternatives: Remove alternative facility list

2024-07-23T14:02:31+00:00

The alternative and the normal facility list are always identical. Remove the alternative facility list, which allows to simplify the alternatives code. Acked-by: Alexander Gordeev Tested-by: Sven Schnelle Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390: Replace S390_lowcore by get_lowcore()

2024-06-18T15:01:33+00:00

Replace all S390_lowcore usages in arch/s390/ by get_lowcore(). Acked-by: Heiko Carstens Signed-off-by: Sven Schnelle Signed-off-by: Vasily Gorbik

KVM: s390: vsie: Fix length of facility list shadowed

2023-12-23T09:41:09+00:00

The length of the facility list accessed when interpretively executing STFLE is the same as the hosts facility list (in case of format-0) The memory following the facility list doesn't need to be accessible. The current VSIE implementation accesses a fixed length that exceeds the guest/host facility list length and can therefore wrongly inject a validity intercept. Instead, find out the host facility list length by running STFLE and copy only as much as necessary when shadowing. Acked-by: David Hildenbrand Reviewed-by: Claudio Imbrenda Acked-by: Heiko Carstens Signed-off-by: Nina Schoetterl-Glausch Reviewed-by: Janosch Frank Link: https://lore.kernel.org/r/20231219140854.1042599-3-nsg@linux.ibm.com Signed-off-by: Janosch Frank Message-ID: <20231219140854.1042599-3-nsg@linux.ibm.com>

include/linux/delay.h: replace kernel.h with the necessary inclusions

2021-11-09T18:02:49+00:00

When kernel.h is used in the headers it adds a lot into dependency hell, especially when there are circular dependencies are involved. Replace kernel.h inclusion with the list of what is really being used. [akpm@linux-foundation.org: cxd2880_common.h needs bits.h for GENMASK()] [andriy.shevchenko@linux.intel.com: delay.h: fix for removed kernel.h] Link: https://lkml.kernel.org/r/20211028170143.56523-1-andriy.shevchenko@linux.intel.com [akpm@linux-foundation.org: include/linux/fwnode.h needs bits.h for BIT()] Link: https://lkml.kernel.org/r/20211027150324.79827-1-andriy.shevchenko@linux.intel.com Signed-off-by: Andy Shevchenko Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

s390/facility: get rid of register asm

2021-06-18T14:41:23+00:00

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

s390/facilities: move stfl information from lowcore to global data

2021-06-07T15:06:58+00:00

With gcc-11, there are a lot of warnings because the facility functions are accessing lowcore through a null pointer. Fix this by moving the facility arrays away from lowcore. Signed-off-by: Sven Schnelle Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

Fix "ordering" comment typos

2021-01-29T16:12:33+00:00

Fix comment typos in "ordering". Signed-off-by: Bjorn Helgaas Acked-by: Kalle Valo Acked-by: Vasily Gorbik # s390