On Thu, Apr 18, 2024 at 11:41:29AM -0700, Eric Biggers wrote: > If the RISC-V kernel ever disables V, then it should also disable everything > that depends on V. > > This would be similar to how on x86, if the kernel decides to disable AVX to > mitigate the Gather Data Sampling vulnerability, it also disables AVX2, AVX512, > VAES, VPCLMULQDQ, etc. See cpuid_deps[] in arch/x86/kernel/cpu/cpuid-deps.c. > > Sometimes CPU features depend on other ones. That's just the way things work. 🤨 > Whenever possible that should be handled centrally, not pushed down to every > user both in-kernel and userspace. FWIW, anything detected but rejected while probing the DT or ACPI tables will cause riscv_isa_extension_available() (or other APIs) to return false.
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