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4774848fef
mirror_ubuntu-kernels/arch/riscv/kernel
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Samuel Holland 4774848fef
riscv: Add a custom ISA extension for the [ms]envcfg CSR 
The [ms]envcfg CSR was added in version 1.12 of the RISC-V privileged
ISA (aka S[ms]1p12). However, bits in this CSR are defined by several
other extensions which may be implemented separately from any particular
version of the privileged ISA (for example, some unrelated errata may
prevent an implementation from claiming conformance with Ss1p12). As a
result, Linux cannot simply use the privileged ISA version to determine
if the CSR is present. It must also check if any of these other
extensions are implemented. It also cannot probe the existence of the
CSR at runtime, because Linux does not require Sstrict, so (in the
absence of additional information) it cannot know if a CSR at that
address is [ms]envcfg or part of some non-conforming vendor extension.

Since there are several standard extensions that imply the existence of
the [ms]envcfg CSR, it becomes unwieldy to check for all of them
wherever the CSR is accessed. Instead, define a custom Xlinuxenvcfg ISA
extension bit that is implied by the other extensions and denotes that
the CSR exists as defined in the privileged ISA, containing at least one
of the fields common between menvcfg and senvcfg.

This extension does not need to be parsed from the devicetree or ISA
string because it can only be implemented as a subset of some other
standard extension.

Cc: <stable@vger.kernel.org> # v6.7+
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20240228065559.3434837-3-samuel.holland@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2024-02-29 10:20:17 -08:00
..
compat_vdso kbuild: unify vdso_install rules 2023-10-28 21:09:02 +09:00
pi riscv: Fix an off-by-one in get_early_cmdline() 2024-01-11 08:04:18 -08:00
probes riscv: Use SYM_*() assembly macros instead of deprecated ones 2023-11-06 09:42:47 -08:00
tests Support rv32 ULEB128 test 2023-12-06 04:08:39 -08:00
vdso RISC-V Patches for the 6.8 Merge Window, Part 1 2024-01-17 10:50:46 -08:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
acpi.c RISC-V: ACPI: Enhance acpi_os_ioremap with MMIO remapping 2023-10-26 09:40:31 -07:00
alternative.c Merge patch series "Add non-coherent DMA support for AX45MP" 2023-09-08 11:24:34 -07:00
asm-offsets.c riscv: Implement Shadow Call Stack 2023-10-27 14:43:08 -07:00
cacheinfo.c RISC-V Patches for the 6.4 Merge Window, Part 1 2023-04-28 16:55:39 -07:00
cfi.c cfi: Flip headers 2023-12-15 16:25:55 -08:00
compat_signal.c riscv: compat: signal: Add rt_frame implementation 2022-05-17 16:37:21 -07:00
compat_syscall_table.c riscv: Implement syscall wrappers 2023-08-23 14:16:36 -07:00
copy-unaligned.h RISC-V: Probe for unaligned access speed 2023-09-01 09:06:25 -07:00
copy-unaligned.S riscv: Use SYM_*() assembly macros instead of deprecated ones 2023-11-06 09:42:47 -08:00
cpu_ops_sbi.c riscv: Remove unused members from struct cpu_operations 2024-01-04 15:03:06 -08:00
cpu_ops_spinwait.c riscv: Remove unused members from struct cpu_operations 2024-01-04 15:03:06 -08:00
cpu_ops.c riscv: Use the same CPU operations for all CPUs 2024-01-04 15:03:07 -08:00
cpu-hotplug.c riscv: Use the same CPU operations for all CPUs 2024-01-04 15:03:07 -08:00
cpu.c Merge patch series "Linux RISC-V AIA Preparatory Series" 2023-11-08 18:57:17 -08:00
cpufeature.c riscv: Add a custom ISA extension for the [ms]envcfg CSR 2024-02-29 10:20:17 -08:00
crash_core.c kexec: drop dependency on ARCH_SUPPORTS_KEXEC from CRASH_DUMP 2023-12-12 17:20:16 -08:00
crash_dump.c vmcore: convert copy_oldmem_page() to take an iov_iter 2022-04-29 14:37:59 -07:00
crash_save_regs.S RISC-V: Fixup get incorrect user mode PC for kernel mode regs 2022-08-11 08:54:40 -07:00
efi-header.S riscv: Prepare EFI header for relocatable kernels 2023-04-19 07:46:28 -07:00
efi.c riscv: Use accessors to page table entries instead of direct dereference 2023-12-20 10:48:15 -08:00
elf_kexec.c kexec_file, riscv: print out debugging message if required 2023-12-20 15:02:57 -08:00
entry.S riscv: vector: allow kernel-mode Vector with preemption 2024-01-16 07:14:02 -08:00
fpu.S riscv: Use SYM_*() assembly macros instead of deprecated ones 2023-11-06 09:42:47 -08:00
ftrace.c riscv: ftrace: Make function graph use ftrace directly 2024-01-17 18:17:08 -08:00
head.h riscv: entry: Convert to generic entry 2023-03-23 08:47:00 -07:00
head.S Merge patch series "Fix XIP boot and make XIP testable in QEMU" 2024-01-09 20:10:39 -08:00
hibernate-asm.S riscv: Use SYM_*() assembly macros instead of deprecated ones 2023-11-06 09:42:47 -08:00
hibernate.c riscv: hibernate: remove WARN_ON in save_processor_state 2023-06-23 10:06:22 -07:00
image-vars.h efi: move screen_info into efi init code 2023-10-17 16:33:39 +02:00
irq.c Merge patch "drivers: perf: Do not broadcast to other cpus when starting a counter" 2023-11-09 06:44:13 -08:00
jump_label.c jump_label: make initial NOP patching the special case 2022-06-24 09:48:55 +02:00
kernel_mode_vector.c riscv: vector: allow kernel-mode Vector with preemption 2024-01-16 07:14:02 -08:00
kexec_relocate.S riscv: kexec: Cleanup riscv_kexec_relocate 2023-09-20 02:53:29 -07:00
kgdb.c RISC-V: rename parse_asm.h to insn.h 2022-12-29 06:59:47 -08:00
machine_kexec_file.c RISC-V: Add kexec_file support 2022-05-19 12:14:18 -07:00
machine_kexec.c kexec_file, riscv: print out debugging message if required 2023-12-20 15:02:57 -08:00
Makefile RISC-V Patches for the 6.8 Merge Window, Part 4 2024-01-20 11:06:04 -08:00
mcount-dyn.S Merge patch series "riscv: ftrace: Miscellaneous ftrace improvements" 2024-01-17 18:17:29 -08:00
mcount.S use linux/export.h rather than asm-generic/export.h 2024-01-09 20:10:40 -08:00
module-sections.c
module.c riscv: optimize ELF relocation function in riscv 2024-01-17 18:21:10 -08:00
paravirt.c RISC-V: paravirt: Implement steal-time support 2023-12-30 11:26:04 +05:30
patch.c riscv: Check if the code to patch lies in the exit section 2024-01-09 10:58:59 -08:00
perf_callchain.c riscv: Fix fill_callchain return value 2022-03-30 23:01:42 -07:00
perf_regs.c perf/arch: Remove perf_sample_data::regs_user_copy 2020-11-09 18:12:34 +01:00
process.c riscv: vector: allow kernel-mode Vector with preemption 2024-01-16 07:14:02 -08:00
ptrace.c riscv: vector: do not pass task_struct into riscv_v_vstate_{save,restore}() 2024-01-16 07:13:59 -08:00
reset.c riscv: Use do_kernel_power_off() 2022-05-19 19:30:30 +02:00
riscv_ksyms.c RISC-V: add infrastructure to allow different str* implementations 2023-01-31 11:43:23 -08:00
sbi-ipi.c RISC-V: Allow marking IPIs as suitable for remote FENCEs 2023-04-08 11:26:24 +01:00
sbi.c RISC-V: Add SBI debug console helper routines 2024-01-10 07:04:03 -08:00
setup.c Driver core changes for 6.8-rc1 2024-01-18 09:48:40 -08:00
signal.c Merge patch series "riscv: support kernel-mode Vector" 2024-01-16 07:14:04 -08:00
smp.c riscv: Use the same CPU operations for all CPUs 2024-01-04 15:03:07 -08:00
smpboot.c riscv: Use the same CPU operations for all CPUs 2024-01-04 15:03:07 -08:00
soc.c riscv: Fix builtin DTB handling 2021-01-07 19:00:50 -08:00
stacktrace.c riscv: Use READ_ONCE_NOCHECK in imprecise unwinding stack mode 2023-03-09 14:50:35 -08:00
suspend_entry.S riscv: Use SYM_*() assembly macros instead of deprecated ones 2023-11-06 09:42:47 -08:00
suspend.c riscv: sbi: Introduce system suspend support 2024-01-11 07:36:26 -08:00
sys_hwprobe.c Merge patch series "riscv: hwprobe: add Zicond, Zacas and Ztso support" 2024-01-09 20:14:51 -08:00
sys_riscv.c riscv: hwprobe: export Zicond extension 2024-01-09 20:12:30 -08:00
syscall_table.c riscv: Implement syscall wrappers 2023-08-23 14:16:36 -07:00
time.c RISC-V: paravirt: Add skeleton for pv-time support 2023-12-30 11:25:03 +05:30
traps_misaligned.c Merge remote-tracking branch 'palmer/fixes' into for-next 2024-01-09 20:10:32 -08:00
traps.c Merge patch "drivers: perf: Do not broadcast to other cpus when starting a counter" 2023-11-09 06:44:13 -08:00
vdso.c riscv: vdso: include vdso/vsyscall.h for vdso_data 2023-07-04 07:54:41 -07:00
vector.c riscv: vector: allow kernel-mode Vector with preemption 2024-01-16 07:14:02 -08:00
vmlinux-xip.lds.S riscv: Check if the code to patch lies in the exit section 2024-01-09 10:58:59 -08:00
vmlinux.lds.S riscv: Check if the code to patch lies in the exit section 2024-01-09 10:58:59 -08:00