From f393a761763c542761abcf978252d431269366d6 Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Tue, 8 Jul 2025 14:56:23 +0200 Subject: efi: add ovmf debug log driver Recent OVMF versions (edk2-stable202508 + newer) can write their debug log to a memory buffer. This driver exposes the log content via sysfs (/sys/firmware/efi/ovmf_debug_log). Signed-off-by: Gerd Hoffmann Signed-off-by: Ard Biesheuvel --- include/linux/efi.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux') diff --git a/include/linux/efi.h b/include/linux/efi.h index 7d63d1d75f22..50db7df0efab 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -439,6 +439,7 @@ void efi_native_runtime_setup(void); /* OVMF protocol GUIDs */ #define OVMF_SEV_MEMORY_ACCEPTANCE_PROTOCOL_GUID EFI_GUID(0xc5a010fe, 0x38a7, 0x4531, 0x8a, 0x4a, 0x05, 0x00, 0xd2, 0xfd, 0x16, 0x49) +#define OVMF_MEMORY_LOG_TABLE_GUID EFI_GUID(0x95305139, 0xb20f, 0x4723, 0x84, 0x25, 0x62, 0x7c, 0x88, 0x8f, 0xf1, 0x21) typedef struct { efi_guid_t guid; @@ -642,6 +643,7 @@ extern struct efi { unsigned long esrt; /* ESRT table */ unsigned long tpm_log; /* TPM2 Event Log table */ unsigned long tpm_final_log; /* TPM2 Final Events Log table */ + unsigned long ovmf_debug_log; unsigned long mokvar_table; /* MOK variable config table */ unsigned long coco_secret; /* Confidential computing secret table */ unsigned long unaccepted; /* Unaccepted memory table */ @@ -1344,6 +1346,8 @@ bool efi_config_table_is_usable(const efi_guid_t *guid, unsigned long table) umode_t efi_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n); +int ovmf_log_probe(unsigned long ovmf_debug_log_table); + /* * efivar ops event type */ -- cgit v1.2.3