riscv: Add ghostwrite vulnerability

Follow the patterns of the other architectures that use GENERIC_CPU_VULNERABILITIES for riscv to introduce the ghostwrite vulnerability and mitigation. The mitigation is to disable all vector which is accomplished by clearing the bit from the cpufeature field. Ghostwrite only affects thead c9xx CPUs that impelment xtheadvector, so the vulerability will only be mitigated on these CPUs. Signed-off-by: Charlie Jenkins <charlie@rivosinc.com> Tested-by: Yangyu Chen <cyy@cyyself.name> Link: https://lore.kernel.org/r/20241113-xtheadvector-v11-14-236c22791ef9@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2026-11-10 20:48:12 +00:00 · 2024-11-13 18:21:20 -08:00 · 2024-11-13 18:21:20 -08:00 · 4bf9706923
commit 4bf9706923
parent c384c5d4a2
9 changed files with 138 additions and 2 deletions
--- a/arch/riscv/Kconfig.errata
+++ b/arch/riscv/Kconfig.errata
--- a/arch/riscv/errata/thead/errata.c
+++ b/arch/riscv/errata/thead/errata.c
--- a/arch/riscv/include/asm/bugs.h
+++ b/arch/riscv/include/asm/bugs.h
--- a/arch/riscv/include/asm/errata_list.h
+++ b/arch/riscv/include/asm/errata_list.h
--- a/arch/riscv/kernel/Makefile
+++ b/arch/riscv/kernel/Makefile
--- a/arch/riscv/kernel/bugs.c
+++ b/arch/riscv/kernel/bugs.c
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h