mirror of
https://gitee.com/bianbu-linux/linux-6.6
synced 2025-04-24 14:07:52 -04:00
522b1d6921
Add a fix for the Zen2 VZEROUPPER data corruption bug where under certain circumstances executing VZEROUPPER can cause register corruption or leak data. The optimal fix is through microcode but in the case the proper microcode revision has not been applied, enable a fallback fix using a chicken bit. Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_MICROCODE_AMD_H
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#define _ASM_X86_MICROCODE_AMD_H
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#include <asm/microcode.h>
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#define UCODE_MAGIC 0x00414d44
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#define UCODE_EQUIV_CPU_TABLE_TYPE 0x00000000
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#define UCODE_UCODE_TYPE 0x00000001
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#define SECTION_HDR_SIZE 8
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#define CONTAINER_HDR_SZ 12
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struct equiv_cpu_entry {
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u32 installed_cpu;
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u32 fixed_errata_mask;
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u32 fixed_errata_compare;
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u16 equiv_cpu;
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u16 res;
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} __attribute__((packed));
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struct microcode_header_amd {
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u32 data_code;
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u32 patch_id;
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u16 mc_patch_data_id;
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u8 mc_patch_data_len;
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u8 init_flag;
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u32 mc_patch_data_checksum;
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u32 nb_dev_id;
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u32 sb_dev_id;
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u16 processor_rev_id;
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u8 nb_rev_id;
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u8 sb_rev_id;
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u8 bios_api_rev;
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u8 reserved1[3];
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u32 match_reg[8];
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} __attribute__((packed));
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struct microcode_amd {
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struct microcode_header_amd hdr;
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unsigned int mpb[];
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};
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#define PATCH_MAX_SIZE (3 * PAGE_SIZE)
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#ifdef CONFIG_MICROCODE_AMD
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extern void __init load_ucode_amd_bsp(unsigned int family);
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extern void load_ucode_amd_ap(unsigned int family);
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extern int __init save_microcode_in_initrd_amd(unsigned int family);
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void reload_ucode_amd(unsigned int cpu);
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extern void amd_check_microcode(void);
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#else
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static inline void __init load_ucode_amd_bsp(unsigned int family) {}
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static inline void load_ucode_amd_ap(unsigned int family) {}
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static inline int __init
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save_microcode_in_initrd_amd(unsigned int family) { return -EINVAL; }
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static inline void reload_ucode_amd(unsigned int cpu) {}
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static inline void amd_check_microcode(void) {}
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#endif
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#endif /* _ASM_X86_MICROCODE_AMD_H */
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