[PATCH v2 3/7] efi/runtime: Deal with arch_efi_call_virt_setup() returning failure
From: Ard Biesheuvel <hidden>
Date: 2025-09-05 13:30:50
Also in:
linux-efi, lkml
Subsystem:
extensible firmware interface (efi), the rest, x86 architecture (32-bit and 64-bit), x86 platform uv hpe superdome flex · Maintainers:
Ard Biesheuvel, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, Steve Wahl
From: Ard Biesheuvel <ardb@kernel.org> Deal with arch_efi_call_virt_setup() returning failure, by giving up and returning an appropriate error code to the caller. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> --- arch/x86/platform/uv/bios_uv.c | 3 ++- drivers/firmware/efi/runtime-wrappers.c | 20 +++++++++++++------- include/linux/efi.h | 8 ++++---- 3 files changed, 19 insertions(+), 12 deletions(-)
diff --git a/arch/x86/platform/uv/bios_uv.c b/arch/x86/platform/uv/bios_uv.c
index bf31af3d32d6..a442bbe5b1c2 100644
--- a/arch/x86/platform/uv/bios_uv.c
+++ b/arch/x86/platform/uv/bios_uv.c@@ -32,7 +32,8 @@ static s64 __uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, */ return BIOS_STATUS_UNIMPLEMENTED; - ret = efi_call_virt_pointer(tab, function, (u64)which, a1, a2, a3, a4, a5); + ret = efi_call_virt_pointer(tab, function, BIOS_STATUS_UNIMPLEMENTED, + (u64)which, a1, a2, a3, a4, a5); return ret; }
diff --git a/drivers/firmware/efi/runtime-wrappers.c b/drivers/firmware/efi/runtime-wrappers.c
index 708b777857d3..82a27b414485 100644
--- a/drivers/firmware/efi/runtime-wrappers.c
+++ b/drivers/firmware/efi/runtime-wrappers.c@@ -219,7 +219,10 @@ static void __nocfi efi_call_rts(struct work_struct *work) efi_status_t status = EFI_NOT_FOUND; unsigned long flags; - arch_efi_call_virt_setup(); + if (!arch_efi_call_virt_setup()) { + status = EFI_NOT_READY; + goto out; + } flags = efi_call_virt_save_flags(); switch (efi_rts_work.efi_rts_id) {
@@ -308,6 +311,7 @@ static void __nocfi efi_call_rts(struct work_struct *work) efi_call_virt_check_flags(flags, efi_rts_work.caller); arch_efi_call_virt_teardown(); +out: efi_rts_work.status = status; complete(&efi_rts_work.efi_rts_comp); }
@@ -444,8 +448,8 @@ virt_efi_set_variable_nb(efi_char16_t *name, efi_guid_t *vendor, u32 attr, if (down_trylock(&efi_runtime_lock)) return EFI_NOT_READY; - status = efi_call_virt_pointer(efi.runtime, set_variable, name, vendor, - attr, data_size, data); + status = efi_call_virt_pointer(efi.runtime, set_variable, EFI_NOT_READY, + name, vendor, attr, data_size, data); up(&efi_runtime_lock); return status; }
@@ -481,9 +485,9 @@ virt_efi_query_variable_info_nb(u32 attr, u64 *storage_space, if (down_trylock(&efi_runtime_lock)) return EFI_NOT_READY; - status = efi_call_virt_pointer(efi.runtime, query_variable_info, attr, - storage_space, remaining_space, - max_variable_size); + status = efi_call_virt_pointer(efi.runtime, query_variable_info, + EFI_NOT_READY, attr, storage_space, + remaining_space, max_variable_size); up(&efi_runtime_lock); return status; }
@@ -509,12 +513,14 @@ virt_efi_reset_system(int reset_type, efi_status_t status, return; } - arch_efi_call_virt_setup(); + if (!arch_efi_call_virt_setup()) + goto out; efi_rts_work.efi_rts_id = EFI_RESET_SYSTEM; arch_efi_call_virt(efi.runtime, reset_system, reset_type, status, data_size, data); arch_efi_call_virt_teardown(); +out: up(&efi_runtime_lock); }
diff --git a/include/linux/efi.h b/include/linux/efi.h
index a98cc39e7aaa..325d892e559b 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h@@ -1181,19 +1181,19 @@ static inline void efi_check_for_embedded_firmwares(void) { } * Restores the usual kernel environment once the call has returned. */ -#define efi_call_virt_pointer(p, f, args...) \ +#define efi_call_virt_pointer(p, f, busy, args...) \ ({ \ - typeof((p)->f(args)) __s; \ + typeof((p)->f(args)) __s = (busy); \ unsigned long __flags; \ \ - arch_efi_call_virt_setup(); \ + if (!arch_efi_call_virt_setup()) goto __out; \ \ __flags = efi_call_virt_save_flags(); \ __s = arch_efi_call_virt(p, f, args); \ efi_call_virt_check_flags(__flags, NULL); \ \ arch_efi_call_virt_teardown(); \ - \ +__out: \ __s; \ })
--
2.51.0.355.g5224444f11-goog