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riscv: Add ghostwrite vulnerability

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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>
This commit is contained in:
Charlie Jenkins
2024-11-13 18:21:20 -08:00
committed by Palmer Dabbelt
parent c384c5d4a2
commit 4bf9706923
9 changed files with 138 additions and 2 deletions
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include/linux/cpu.h
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@@ -77,6 +77,7 @@ extern ssize_t cpu_show_gds(struct device *dev,
struct device_attribute *attr, char *buf);
extern ssize_t cpu_show_reg_file_data_sampling(struct device *dev,
struct device_attribute *attr, char *buf);
extern ssize_t cpu_show_ghostwrite(struct device *dev, struct device_attribute *attr, char *buf);
extern __printf(4, 5)
struct device *cpu_device_create(struct device *parent, void *drvdata,