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authorLinus Torvalds <torvalds@linux-foundation.org>2023-02-23 14:41:48 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2023-02-23 14:41:48 -0800
commit06e1a81c4806d0b7f75f9d742ebf410718244e03 (patch)
tree05c97c56f6c755608c01cc0160ba33c4db88f1de /fs/efivarfs
parentf2b98d0af217f64b96bc549457018117ba6b7509 (diff)
parente1d447157f232c650e6f32c9fb89ff3d0207c69a (diff)
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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.c9
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);
}