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6e97c234cd
TDX metadata like the version number changes during a module update. Add functions to lock out module updates. The current stop_machine() implementation uses worker threads. The scheduler actually does a full, normal context switch over to that thread. preempt_disable() obviously inhibits that context switch and thus, locks out stop_machine() users like the module update. Thanks to Chao for the idea of using preempt_disable(). Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
39 lines
891 B
C
39 lines
891 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_SEAMLDR_H
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#define _ASM_X86_SEAMLDR_H
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#include <linux/types.h>
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/*
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* This is the "SEAMLDR_INFO" data structure defined in the
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* "SEAM Loader (SEAMLDR) Interface Specification".
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*
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* Must be aligned to a 256-byte boundary.
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*/
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struct seamldr_info {
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u32 version;
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u32 attributes;
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u32 vendor_id;
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u32 build_date;
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u16 build_num;
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u16 minor_version;
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u16 major_version;
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u16 update_version;
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u32 acm_x2apicid;
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u32 num_remaining_updates;
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u8 seam_info[128];
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u8 seam_ready;
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u8 seam_debug;
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u8 p_seam_ready;
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u8 reserved[93];
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} __packed __aligned(256);
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static_assert(sizeof(struct seamldr_info) == 256);
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int seamldr_get_info(struct seamldr_info *seamldr_info);
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int seamldr_install_module(const u8 *data, u32 data_len);
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void seamldr_lock_module_update(void);
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void seamldr_unlock_module_update(void);
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#endif /* _ASM_X86_SEAMLDR_H */
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