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linux/arch/riscv/kernel
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JinRui 248dbaf777 riscv: report Zfhmin/Zvfhmin when Zfh/Zvfh are present 
The RISC-V ISA manual specifies that Zfh implies Zfhmin, a normative
rule clarified in
https://github.com/riscv/riscv-isa-manual/pull/3070. Zvfh likewise
implies Zvfhmin, as stated by the vector extension specification.

The kernel currently reports ZFH and ZFHMIN (and ZVFH and ZVFHMIN) as
independent hwprobe bits derived only from what the device tree
declares. Platforms that declare just "zfh" (Zfh being a superset that
already contains all Zfhmin instructions) therefore report
RISCV_HWPROBE_EXT_ZFHMIN=0, which breaks userspace RVA23 conformance
checks (e.g. snapd installing core26 on riscv64).

Use the existing superset mechanism to set the implied subset bits:
  - zfh implies zfhmin
  - zvfh implies zvfhmin

Add a hwprobe selftest asserting the implication holds and update the
hwprobe documentation accordingly.

This is complementary to the rva23u64 base behavior discussion: the
RVA23 conformance query proposed there is derived from the
per-extension bits fixed here, so correct EXT_0 reporting is a
prerequisite for it to work on harts whose device tree declares only
"zfh".

Tested on a RISC-V QEMU VM whose device tree only declares "zfh" and
"zvfh": with this change both /proc/cpuinfo and the hwprobe
RISCV_HWPROBE_KEY_IMA_EXT_0 bitmap report ZFHMIN and ZVFHMIN, and the
hwprobe selftest (including the new implication check) passes.

Link: https://lore.kernel.org/kvm-riscv/20260206002349.96740-1-andrew.jones@oss.qualcomm.com/
Signed-off-by: JinRui <jinrui@haiwei.tech>
Link: https://patch.msgid.link/7190E4DB338251C3+20260811081513.2849980-1-jinrui@haiwei.tech
[pjw@kernel.org: trimmed superfluous blank line in tags]
Signed-off-by: Paul Walmsley <pjw@kernel.org>
2026-09-01 19:19:44 -06:00
..
compat_vdso
pi riscv: pi: replace strlcat with strscpy in get_early_cmdline 2026-06-06 20:17:52 -06:00
probes riscv: probes: simulate c.jal instruction 2026-08-07 19:24:29 -06:00
tests riscv: kprobes: add test case for c.jal instruction simulation 2026-08-07 19:24:29 -06:00
vdso riscv: vdso: Add symbols for the alternative section boundaries 2026-08-07 19:24:33 -06:00
vdso_cfi riscv: vdso_cfi: Add .gitignore for build artifacts 2026-04-04 18:42:44 -06:00
vendor_extensions riscv: hwprobe: Add MIPS vendor extension probing 2025-09-19 10:33:56 -06:00
.gitignore
acpi_numa.c RISC-V: ACPI: Add acpi_get_cpu_uid() for unified ACPI CPU UID retrieval 2026-04-06 16:55:15 +02:00
acpi.c riscv: acpi: Enable ARCH_HAS_ACPI_TABLE_UPGRADE 2026-08-07 19:24:29 -06:00
alternative.c riscv: alternative: Also patch the compat vDSO 2026-08-07 19:24:34 -06:00
asm-offsets.c riscv: Fix 32-bit call_on_irq_stack() frame pointer ABI 2026-06-25 13:44:27 -06:00
bugs.c riscv: use sysfs_emit in cpu_show_ghostwrite 2026-06-06 20:17:52 -06:00
cacheinfo.c riscv: cacheinfo: Fix node reference leak in populate_cache_leaves 2026-06-06 23:48:15 -06:00
cfi.c cfi: Move BPF CFI types and helpers to generic code 2025-07-31 18:23:53 -07:00
compat_signal.c riscv: Fix register corruption from uninitialized cregs on error 2026-05-01 21:11:31 -06:00
compat_syscall_table.c riscv: convert to generic syscall table 2024-07-10 14:23:38 +02:00
copy-unaligned.h RISC-V: Report vector unaligned access speed hwprobe 2024-10-18 12:38:34 -07:00
copy-unaligned.S riscv: Define __riscv_copy_{,vec_}{words,bytes}_unaligned() using SYM_TYPED_FUNC_START 2026-04-29 20:38:17 -06:00
cpu_ops_sbi.c riscv: cpu_ops_sbi: No need to be bothered to check ret.error 2026-06-06 23:48:14 -06:00
cpu_ops_spinwait.c
cpu_ops.c
cpu-hotplug.c riscv: cpu_ops: Change return value type of cpu_is_stopped() to bool 2026-06-06 23:48:14 -06:00
cpu.c RISC-V: Don't print details of CPUs disabled in DT 2025-10-17 22:02:21 -06:00
cpufeature.c riscv: report Zfhmin/Zvfhmin when Zfh/Zvfh are present 2026-09-01 19:19:44 -06:00
crash_dump.c
crash_save_regs.S
efi-header.S include: pe.h: Fix PE definitions 2025-05-21 16:46:37 +02:00
efi.c riscv: efi: Power off via EFI runtime services when available 2026-08-07 19:24:29 -06:00
entry.S riscv: mm: Make mark_new_valid_map() stuff depend on 64BIT && MMU 2026-07-13 11:29:52 -06:00
fpu.S RISC-V: Replace RISCV_MISALIGNED with RISCV_SCALAR_MISALIGNED 2024-10-18 12:38:32 -07:00
ftrace.c riscv: ftrace: Fix ftrace_modify_call failure on kprobed functions 2026-08-06 21:02:56 -06:00
head.h riscv: Remove support for XIP kernel 2026-04-04 18:42:44 -06:00
head.S riscv: Remove support for XIP kernel 2026-04-04 18:42:44 -06:00
hibernate-asm.S
hibernate.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
image-vars.h riscv: add platform-specific double word shifts for riscv32 2026-05-28 21:24:51 -07:00
irq.c riscv: panic if IRQ handler stacks cannot be allocated 2026-06-07 00:56:22 -06:00
jump_label.c riscv: Move nop definition to insn-def.h 2025-03-20 09:14:42 +00:00
kernel_mode_fpu.c
kernel_mode_vector.c RISC-V: KVM: fix vcpu vector context handling for kernel-mode vector 2026-08-13 13:20:02 +05:30
kexec_elf.c riscv: kexec: use min to simplify riscv_kexec_elf_load 2026-06-07 01:06:19 -06:00
kexec_image.c riscv: kexec_image: Fix dead link to boot-image-header.rst 2026-01-05 17:54:11 -07:00
kexec_relocate.S
kgdb.c riscv: kgdb: fix several debug register assignment bugs 2026-04-04 18:36:52 -06:00
machine_kexec_file.c riscv: kexec_file: Add support for crashkernel CMA reservation 2026-06-30 18:49:06 +03:00
machine_kexec.c riscv: Prevent NULL pointer dereference in machine_kexec_prepare() 2026-07-06 18:24:06 -06:00
Makefile riscv: Add support for srmcfg CSR from Ssqosid extension 2026-08-07 19:24:32 -06:00
Makefile.syscalls syscalls: fix syscall macros for newfstat/newfstatat 2024-08-02 15:20:47 +02:00
mcount-dyn.S riscv: fix various typos in comments and code 2026-04-04 18:42:39 -06:00
mcount.S riscv: fgraph: Fix stack layout to match __arch_ftrace_regs argument of ftrace_return_to_handler 2025-03-19 12:03:25 +00:00
module-sections.c riscv: module: Use generic cmp_int() instead of custom cmp_3way() 2026-06-06 20:17:53 -06:00
module.c Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses 2026-02-22 08:26:33 -08:00
paravirt.c riscv/paravirt: Use common code for paravirt_steal_clock() 2026-01-12 16:47:33 +01:00
patch.c riscv: patch: skip fixmap mapping when kernel text is already writable 2026-08-31 19:11:23 -06:00
perf_callchain.c The biggest change here is eliminating the awful idea that KVM had, of 2024-11-23 16:00:50 -08:00
perf_regs.c
process.c Revert "riscv: Reset pmm when PR_TAGGED_ADDR_ENABLE is not set" 2026-08-31 19:11:23 -06:00
ptrace.c riscv/ptrace: Use USER_REGSET_NOTE_TYPE for REGSET_CFI 2026-06-06 20:17:04 -06:00
qos.c riscv: Add support for srmcfg CSR from Ssqosid extension 2026-08-07 19:24:32 -06:00
reset.c riscv: Mark default_power_off() as __noreturn 2026-08-07 19:24:30 -06:00
return_address.c
riscv_ksyms.c riscv: Omit optimized string routines when using KASAN 2024-09-19 01:10:00 -07:00
sbi_ecall.c riscv: Fix RISCV_ALTERNATIVE_EARLY 2024-09-03 07:57:55 -07:00
sbi-ipi.c RISC-V: Enable the IPI before workqueue_online_cpu() 2024-08-01 07:15:43 -07:00
sbi.c riscv: sbi: Prefer SRST shutdown over legacy 2025-11-16 10:37:27 -07:00
setup.c riscv: acpi: Enable ARCH_HAS_ACPI_TABLE_UPGRADE 2026-08-07 19:24:29 -06:00
signal.c riscv/signal: save and restore the shadow stack on a signal 2026-01-29 02:38:40 -07:00
smp.c genirq/proc: Increase default interrupt number precision to four 2026-05-26 16:21:14 +02:00
smpboot.c riscv: smp: use secs_to_jiffies in __cpu_up 2026-06-25 12:24:25 -06:00
soc.c riscv: fix various typos in comments and code 2026-04-04 18:42:39 -06:00
stacktrace.c riscv: stacktrace: Remove bogus -0x4 offset in non-FP walk_stackframe 2026-06-06 23:48:15 -06:00
suspend_entry.S riscv: Remove support for XIP kernel 2026-04-04 18:42:44 -06:00
suspend.c riscv: fix various typos in comments and code 2026-04-04 18:42:39 -06:00
sys_hwprobe.c riscv: hwprobe: initialize pair->value in hwprobe_one_pair() 2026-08-31 19:11:23 -06:00
sys_riscv.c riscv/mm: ensure PROT_WRITE leads to VM_READ | VM_WRITE 2026-01-25 21:09:53 -07:00
syscall_table.c riscv: convert to generic syscall table 2024-07-10 14:23:38 +02:00
time.c
traps_misaligned.c riscv: traps_misaligned: Avoid redundant unaligned access speed probe 2026-06-08 10:47:22 -06:00
traps.c RISC-V updates for v7.3 2026-08-20 14:53:54 -07:00
unaligned_access_speed.c riscv: unaligned: stop using kthread for check_vector_unaligned_access() 2026-08-07 19:24:30 -06:00
usercfi.c riscv: use string helper in setup_global_riscv_enable() 2026-08-31 19:11:23 -06:00
vdso.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
vec-copy-unaligned.S riscv: Define __riscv_copy_{,vec_}{words,bytes}_unaligned() using SYM_TYPED_FUNC_START 2026-04-29 20:38:17 -06:00
vector.c riscv: vector: init vector context with proper vlenb 2026-02-09 15:27:33 -07:00
vendor_extensions.c riscv: Add xmipsexectl as a vendor extension 2025-09-18 20:36:00 -06:00
vmcore_info.c riscv: Remove support for XIP kernel 2026-04-04 18:42:44 -06:00
vmlinux.lds.S riscv: Remove support for XIP kernel 2026-04-04 18:42:44 -06:00