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author | Linus Torvalds <torvalds@linux-foundation.org> | 2023-02-23 23:41:48 +0100 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-02-23 23:41:48 +0100 |
commit | 06e1a81c4806d0b7f75f9d742ebf410718244e03 (patch) | |
tree | 05c97c56f6c755608c01cc0160ba33c4db88f1de /fs/efivarfs | |
parent | Merge tag 'bootconfig-v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/... (diff) | |
parent | firmware/efi sysfb_efi: Add quirk for Lenovo IdeaPad Duet 3 (diff) | |
download | linux-06e1a81c4806d0b7f75f9d742ebf410718244e03.tar.xz linux-06e1a81c4806d0b7f75f9d742ebf410718244e03.zip |
Merge tag 'efi-next-for-v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi
Pull EFI updates from Ard Biesheuvel:
"A healthy mix of EFI contributions this time:
- Performance tweaks for efifb earlycon (Andy)
- Preparatory refactoring and cleanup work in the efivar layer, which
is needed to accommodate the Snapdragon arm64 laptops that expose
their EFI variable store via a TEE secure world API (Johan)
- Enhancements to the EFI memory map handling so that Xen dom0 can
safely access EFI configuration tables (Demi Marie)
- Wire up the newly introduced IBT/BTI flag in the EFI memory
attributes table, so that firmware that is generated with ENDBR/BTI
landing pads will be mapped with enforcement enabled
- Clean up how we check and print the EFI revision exposed by the
firmware
- Incorporate EFI memory attributes protocol definition and wire it
up in the EFI zboot code (Evgeniy)
This ensures that these images can execute under new and stricter
rules regarding the default memory permissions for EFI page
allocations (More work is in progress here)
- CPER header cleanup (Dan Williams)
- Use a raw spinlock to protect the EFI runtime services stack on
arm64 to ensure the correct semantics under -rt (Pierre)
- EFI framebuffer quirk for Lenovo Ideapad (Darrell)"
* tag 'efi-next-for-v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi: (24 commits)
firmware/efi sysfb_efi: Add quirk for Lenovo IdeaPad Duet 3
arm64: efi: Make efi_rt_lock a raw_spinlock
efi: Add mixed-mode thunk recipe for GetMemoryAttributes
efi: x86: Wire up IBT annotation in memory attributes table
efi: arm64: Wire up BTI annotation in memory attributes table
efi: Discover BTI support in runtime services regions
efi/cper, cxl: Remove cxl_err.h
efi: Use standard format for printing the EFI revision
efi: Drop minimum EFI version check at boot
efi: zboot: Use EFI protocol to remap code/data with the right attributes
efi/libstub: Add memory attribute protocol definitions
efi: efivars: prevent double registration
efi: verify that variable services are supported
efivarfs: always register filesystem
efi: efivars: add efivars printk prefix
efi: Warn if trying to reserve memory under Xen
efi: Actually enable the ESRT under Xen
efi: Apply allowlist to EFI configuration tables when running under Xen
efi: xen: Implement memory descriptor lookup based on hypercall
efi: memmap: Disregard bogus entries instead of returning them
...
Diffstat (limited to 'fs/efivarfs')
-rw-r--r-- | fs/efivarfs/super.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c index 07e82e246666..482d612b716b 100644 --- a/fs/efivarfs/super.c +++ b/fs/efivarfs/super.c @@ -194,6 +194,9 @@ static int efivarfs_fill_super(struct super_block *sb, struct fs_context *fc) struct dentry *root; int err; + if (!efivar_is_available()) + return -EOPNOTSUPP; + sb->s_maxbytes = MAX_LFS_FILESIZE; sb->s_blocksize = PAGE_SIZE; sb->s_blocksize_bits = PAGE_SHIFT; @@ -243,6 +246,9 @@ static void efivarfs_kill_sb(struct super_block *sb) { kill_litter_super(sb); + if (!efivar_is_available()) + return; + /* Remove all entries and destroy */ efivar_entry_iter(efivarfs_destroy, &efivarfs_list, NULL); } @@ -256,9 +262,6 @@ static struct file_system_type efivarfs_type = { static __init int efivarfs_init(void) { - if (!efivars_kobject()) - return -ENODEV; - return register_filesystem(&efivarfs_type); } |