Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next

Pull x86 EFI updates from Peter Anvin:
 "A collection of EFI changes.  The perhaps most important one is to
  fully save and restore the FPU state around each invocation of EFI
  runtime, and to not choke on non-ASCII characters in the boot stub"

* 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efivars: Add compatibility code for compat tasks
  efivars: Refactor sanity checking code into separate function
  efivars: Stop passing a struct argument to efivar_validate()
  efivars: Check size of user object
  efivars: Use local variables instead of a pointer dereference
  x86/efi: Save and restore FPU context around efi_calls (i386)
  x86/efi: Save and restore FPU context around efi_calls (x86_64)
  x86/efi: Implement a __efi_call_virt macro
  x86, fpu: Extend the use of static_cpu_has_safe
  x86/efi: Delete most of the efi_call* macros
  efi: x86: Handle arbitrary Unicode characters
  efi: Add get_dram_base() helper function
  efi: Add shared printk wrapper for consistent prefixing
  efi: create memory map iteration helper
  efi: efi-stub-helper cleanup

7 files changed, 67 insertions, 179 deletions

diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index 4703a6c4b8e3..0331d765c2bb 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -1087,8 +1087,7 @@ struct boot_params *make_boot_params(struct efi_config *c)
 	hdr->type_of_loader = 0x21;
 
 	/* Convert unicode cmdline to ascii */
-	cmdline_ptr = efi_convert_cmdline_to_ascii(sys_table, image,
-						   &options_size);
+	cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
 	if (!cmdline_ptr)
 		goto fail;
 	hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index 0d558ee899ae..2884e0c3e8a5 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -452,7 +452,7 @@ efi32_config:
 	.global efi64_config
 efi64_config:
 	.fill	11,8,0
-	.quad	efi_call6
+	.quad	efi_call
 	.byte	1
 #endif /* CONFIG_EFI_STUB */
 
diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index 0869434eaf72..1eb5f6433ad8 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -1,6 +1,7 @@
 #ifndef _ASM_X86_EFI_H
 #define _ASM_X86_EFI_H
 
+#include <asm/i387.h>
 /*
  * We map the EFI regions needed for runtime services non-contiguously,
  * with preserved alignment on virtual addresses starting from -4G down
@@ -27,91 +28,58 @@
 
 extern unsigned long asmlinkage efi_call_phys(void *, ...);
 
-#define efi_call_phys0(f)		efi_call_phys(f)
-#define efi_call_phys1(f, a1)		efi_call_phys(f, a1)
-#define efi_call_phys2(f, a1, a2)	efi_call_phys(f, a1, a2)
-#define efi_call_phys3(f, a1, a2, a3)	efi_call_phys(f, a1, a2, a3)
-#define efi_call_phys4(f, a1, a2, a3, a4)	\
-	efi_call_phys(f, a1, a2, a3, a4)
-#define efi_call_phys5(f, a1, a2, a3, a4, a5)	\
-	efi_call_phys(f, a1, a2, a3, a4, a5)
-#define efi_call_phys6(f, a1, a2, a3, a4, a5, a6)	\
-	efi_call_phys(f, a1, a2, a3, a4, a5, a6)
 /*
  * Wrap all the virtual calls in a way that forces the parameters on the stack.
  */
 
+/* Use this macro if your virtual returns a non-void value */
 #define efi_call_virt(f, args...) \
-	((efi_##f##_t __attribute__((regparm(0)))*)efi.systab->runtime->f)(args)
-
-#define efi_call_virt0(f)		efi_call_virt(f)
-#define efi_call_virt1(f, a1)		efi_call_virt(f, a1)
-#define efi_call_virt2(f, a1, a2)	efi_call_virt(f, a1, a2)
-#define efi_call_virt3(f, a1, a2, a3)	efi_call_virt(f, a1, a2, a3)
-#define efi_call_virt4(f, a1, a2, a3, a4)	\
-	efi_call_virt(f, a1, a2, a3, a4)
-#define efi_call_virt5(f, a1, a2, a3, a4, a5)	\
-	efi_call_virt(f, a1, a2, a3, a4, a5)
-#define efi_call_virt6(f, a1, a2, a3, a4, a5, a6)	\
-	efi_call_virt(f, a1, a2, a3, a4, a5, a6)
+({									\
+	efi_status_t __s;						\
+	kernel_fpu_begin();						\
+	__s = ((efi_##f##_t __attribute__((regparm(0)))*)		\
+		efi.systab->runtime->f)(args);				\
+	kernel_fpu_end();						\
+	__s;								\
+})
+
+/* Use this macro if your virtual call does not return any value */
+#define __efi_call_virt(f, args...) \
+({									\
+	kernel_fpu_begin();						\
+	((efi_##f##_t __attribute__((regparm(0)))*)			\
+		efi.systab->runtime->f)(args);				\
+	kernel_fpu_end();						\
+})
 
 #define efi_ioremap(addr, size, type, attr)	ioremap_cache(addr, size)
 
 #else /* !CONFIG_X86_32 */
 
-extern u64 efi_call0(void *fp);
-extern u64 efi_call1(void *fp, u64 arg1);
-extern u64 efi_call2(void *fp, u64 arg1, u64 arg2);
-extern u64 efi_call3(void *fp, u64 arg1, u64 arg2, u64 arg3);
-extern u64 efi_call4(void *fp, u64 arg1, u64 arg2, u64 arg3, u64 arg4);
-extern u64 efi_call5(void *fp, u64 arg1, u64 arg2, u64 arg3,
-		     u64 arg4, u64 arg5);
-extern u64 efi_call6(void *fp, u64 arg1, u64 arg2, u64 arg3,
-		     u64 arg4, u64 arg5, u64 arg6);
-
-#define efi_call_phys0(f)			\
-	efi_call0((f))
-#define efi_call_phys1(f, a1)			\
-	efi_call1((f), (u64)(a1))
-#define efi_call_phys2(f, a1, a2)			\
-	efi_call2((f), (u64)(a1), (u64)(a2))
-#define efi_call_phys3(f, a1, a2, a3)				\
-	efi_call3((f), (u64)(a1), (u64)(a2), (u64)(a3))
-#define efi_call_phys4(f, a1, a2, a3, a4)				\
-	efi_call4((f), (u64)(a1), (u64)(a2), (u64)(a3),		\
-		  (u64)(a4))
-#define efi_call_phys5(f, a1, a2, a3, a4, a5)				\
-	efi_call5((f), (u64)(a1), (u64)(a2), (u64)(a3),		\
-		  (u64)(a4), (u64)(a5))
-#define efi_call_phys6(f, a1, a2, a3, a4, a5, a6)			\
-	efi_call6((f), (u64)(a1), (u64)(a2), (u64)(a3),		\
-		  (u64)(a4), (u64)(a5), (u64)(a6))
-
-#define _efi_call_virtX(x, f, ...)					\
+#define EFI_LOADER_SIGNATURE	"EL64"
+
+extern u64 asmlinkage efi_call(void *fp, ...);
+
+#define efi_call_phys(f, args...)		efi_call((f), args)
+
+#define efi_call_virt(f, ...)						\
 ({									\
 	efi_status_t __s;						\
 									\
 	efi_sync_low_kernel_mappings();					\
 	preempt_disable();						\
-	__s = efi_call##x((void *)efi.systab->runtime->f, __VA_ARGS__);	\
+	__kernel_fpu_begin();						\
+	__s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__);	\
+	__kernel_fpu_end();						\
 	preempt_enable();						\
 	__s;								\
 })
 
-#define efi_call_virt0(f)				\
-	_efi_call_virtX(0, f)
-#define efi_call_virt1(f, a1)				\
-	_efi_call_virtX(1, f, (u64)(a1))
-#define efi_call_virt2(f, a1, a2)			\
-	_efi_call_virtX(2, f, (u64)(a1), (u64)(a2))
-#define efi_call_virt3(f, a1, a2, a3)			\
-	_efi_call_virtX(3, f, (u64)(a1), (u64)(a2), (u64)(a3))
-#define efi_call_virt4(f, a1, a2, a3, a4)		\
-	_efi_call_virtX(4, f, (u64)(a1), (u64)(a2), (u64)(a3), (u64)(a4))
-#define efi_call_virt5(f, a1, a2, a3, a4, a5)		\
-	_efi_call_virtX(5, f, (u64)(a1), (u64)(a2), (u64)(a3), (u64)(a4), (u64)(a5))
-#define efi_call_virt6(f, a1, a2, a3, a4, a5, a6)	\
-	_efi_call_virtX(6, f, (u64)(a1), (u64)(a2), (u64)(a3), (u64)(a4), (u64)(a5), (u64)(a6))
+/*
+ * All X86_64 virt calls return non-void values. Thus, use non-void call for
+ * virt calls that would be void on X86_32.
+ */
+#define __efi_call_virt(f, args...) efi_call_virt(f, args)
 
 extern void __iomem *efi_ioremap(unsigned long addr, unsigned long size,
 				 u32 type, u64 attribute);
diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h
index cea1c76d49bf..115e3689cd53 100644
--- a/arch/x86/include/asm/fpu-internal.h
+++ b/arch/x86/include/asm/fpu-internal.h
@@ -87,22 +87,22 @@ static inline int is_x32_frame(void)
 
 static __always_inline __pure bool use_eager_fpu(void)
 {
-	return static_cpu_has(X86_FEATURE_EAGER_FPU);
+	return static_cpu_has_safe(X86_FEATURE_EAGER_FPU);
 }
 
 static __always_inline __pure bool use_xsaveopt(void)
 {
-	return static_cpu_has(X86_FEATURE_XSAVEOPT);
+	return static_cpu_has_safe(X86_FEATURE_XSAVEOPT);
 }
 
 static __always_inline __pure bool use_xsave(void)
 {
-	return static_cpu_has(X86_FEATURE_XSAVE);
+	return static_cpu_has_safe(X86_FEATURE_XSAVE);
 }
 
 static __always_inline __pure bool use_fxsr(void)
 {
-        return static_cpu_has(X86_FEATURE_FXSR);
+	return static_cpu_has_safe(X86_FEATURE_FXSR);
 }
 
 static inline void fx_finit(struct i387_fxsave_struct *fx)
@@ -293,7 +293,7 @@ static inline int restore_fpu_checking(struct task_struct *tsk)
 	/* AMD K7/K8 CPUs don't save/restore FDP/FIP/FOP unless an exception
 	   is pending.  Clear the x87 state here by setting it to fixed
 	   values. "m" is a random variable that should be in L1 */
-	if (unlikely(static_cpu_has(X86_FEATURE_FXSAVE_LEAK))) {
+	if (unlikely(static_cpu_has_safe(X86_FEATURE_FXSAVE_LEAK))) {
 		asm volatile(
 			"fnclex\n\t"
 			"emms\n\t"
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 3781dd39e8bd..835b24820eaa 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -110,7 +110,7 @@ static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
 	efi_status_t status;
 
 	spin_lock_irqsave(&rtc_lock, flags);
-	status = efi_call_virt2(get_time, tm, tc);
+	status = efi_call_virt(get_time, tm, tc);
 	spin_unlock_irqrestore(&rtc_lock, flags);
 	return status;
 }
@@ -121,7 +121,7 @@ static efi_status_t virt_efi_set_time(efi_time_t *tm)
 	efi_status_t status;
 
 	spin_lock_irqsave(&rtc_lock, flags);
-	status = efi_call_virt1(set_time, tm);
+	status = efi_call_virt(set_time, tm);
 	spin_unlock_irqrestore(&rtc_lock, flags);
 	return status;
 }
@@ -134,8 +134,7 @@ static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
 	efi_status_t status;
 
 	spin_lock_irqsave(&rtc_lock, flags);
-	status = efi_call_virt3(get_wakeup_time,
-				enabled, pending, tm);
+	status = efi_call_virt(get_wakeup_time, enabled, pending, tm);
 	spin_unlock_irqrestore(&rtc_lock, flags);
 	return status;
 }
@@ -146,8 +145,7 @@ static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
 	efi_status_t status;
 
 	spin_lock_irqsave(&rtc_lock, flags);
-	status = efi_call_virt2(set_wakeup_time,
-				enabled, tm);
+	status = efi_call_virt(set_wakeup_time, enabled, tm);
 	spin_unlock_irqrestore(&rtc_lock, flags);
 	return status;
 }
@@ -158,17 +156,17 @@ static efi_status_t virt_efi_get_variable(efi_char16_t *name,
 					  unsigned long *data_size,
 					  void *data)
 {
-	return efi_call_virt5(get_variable,
-			      name, vendor, attr,
-			      data_size, data);
+	return efi_call_virt(get_variable,
+			     name, vendor, attr,
+			     data_size, data);
 }
 
 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
 					       efi_char16_t *name,
 					       efi_guid_t *vendor)
 {
-	return efi_call_virt3(get_next_variable,
-			      name_size, name, vendor);
+	return efi_call_virt(get_next_variable,
+			     name_size, name, vendor);
 }
 
 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
@@ -177,9 +175,9 @@ static efi_status_t virt_efi_set_variable(efi_char16_t *name,
 					  unsigned long data_size,
 					  void *data)
 {
-	return efi_call_virt5(set_variable,
-			      name, vendor, attr,
-			      data_size, data);
+	return efi_call_virt(set_variable,
+			     name, vendor, attr,
+			     data_size, data);
 }
 
 static efi_status_t virt_efi_query_variable_info(u32 attr,
@@ -190,13 +188,13 @@ static efi_status_t virt_efi_query_variable_info(u32 attr,
 	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 		return EFI_UNSUPPORTED;
 
-	return efi_call_virt4(query_variable_info, attr, storage_space,
-			      remaining_space, max_variable_size);
+	return efi_call_virt(query_variable_info, attr, storage_space,
+			     remaining_space, max_variable_size);
 }
 
 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
 {
-	return efi_call_virt1(get_next_high_mono_count, count);
+	return efi_call_virt(get_next_high_mono_count, count);
 }
 
 static void virt_efi_reset_system(int reset_type,
@@ -204,8 +202,8 @@ static void virt_efi_reset_system(int reset_type,
 				  unsigned long data_size,
 				  efi_char16_t *data)
 {
-	efi_call_virt4(reset_system, reset_type, status,
-		       data_size, data);
+	__efi_call_virt(reset_system, reset_type, status,
+			data_size, data);
 }
 
 static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
@@ -215,7 +213,7 @@ static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
 	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 		return EFI_UNSUPPORTED;
 
-	return efi_call_virt3(update_capsule, capsules, count, sg_list);
+	return efi_call_virt(update_capsule, capsules, count, sg_list);
 }
 
 static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
@@ -226,8 +224,8 @@ static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
 	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 		return EFI_UNSUPPORTED;
 
-	return efi_call_virt4(query_capsule_caps, capsules, count, max_size,
-			      reset_type);
+	return efi_call_virt(query_capsule_caps, capsules, count, max_size,
+			     reset_type);
 }
 
 static efi_status_t __init phys_efi_set_virtual_address_map(
@@ -239,9 +237,9 @@ static efi_status_t __init phys_efi_set_virtual_address_map(
 	efi_status_t status;
 
 	efi_call_phys_prelog();
-	status = efi_call_phys4(efi_phys.set_virtual_address_map,
-				memory_map_size, descriptor_size,
-				descriptor_version, virtual_map);
+	status = efi_call_phys(efi_phys.set_virtual_address_map,
+			       memory_map_size, descriptor_size,
+			       descriptor_version, virtual_map);
 	efi_call_phys_epilog();
 	return status;
 }
diff --git a/arch/x86/platform/efi/efi_stub_64.S b/arch/x86/platform/efi/efi_stub_64.S
index e0984ef0374b..5fcda7272550 100644
--- a/arch/x86/platform/efi/efi_stub_64.S
+++ b/arch/x86/platform/efi/efi_stub_64.S
@@ -73,84 +73,7 @@
 	2:
 	.endm
 
-ENTRY(efi_call0)
-	SAVE_XMM
-	subq $32, %rsp
-	SWITCH_PGT
-	call *%rdi
-	RESTORE_PGT
-	addq $32, %rsp
-	RESTORE_XMM
-	ret
-ENDPROC(efi_call0)
-
-ENTRY(efi_call1)
-	SAVE_XMM
-	subq $32, %rsp
-	mov  %rsi, %rcx
-	SWITCH_PGT
-	call *%rdi
-	RESTORE_PGT
-	addq $32, %rsp
-	RESTORE_XMM
-	ret
-ENDPROC(efi_call1)
-
-ENTRY(efi_call2)
-	SAVE_XMM
-	subq $32, %rsp
-	mov  %rsi, %rcx
-	SWITCH_PGT
-	call *%rdi
-	RESTORE_PGT
-	addq $32, %rsp
-	RESTORE_XMM
-	ret
-ENDPROC(efi_call2)
-
-ENTRY(efi_call3)
-	SAVE_XMM
-	subq $32, %rsp
-	mov  %rcx, %r8
-	mov  %rsi, %rcx
-	SWITCH_PGT
-	call *%rdi
-	RESTORE_PGT
-	addq $32, %rsp
-	RESTORE_XMM
-	ret
-ENDPROC(efi_call3)
-
-ENTRY(efi_call4)
-	SAVE_XMM
-	subq $32, %rsp
-	mov %r8, %r9
-	mov %rcx, %r8
-	mov %rsi, %rcx
-	SWITCH_PGT
-	call *%rdi
-	RESTORE_PGT
-	addq $32, %rsp
-	RESTORE_XMM
-	ret
-ENDPROC(efi_call4)
-
-ENTRY(efi_call5)
-	SAVE_XMM
-	subq $48, %rsp
-	mov %r9, 32(%rsp)
-	mov %r8, %r9
-	mov %rcx, %r8
-	mov %rsi, %rcx
-	SWITCH_PGT
-	call *%rdi
-	RESTORE_PGT
-	addq $48, %rsp
-	RESTORE_XMM
-	ret
-ENDPROC(efi_call5)
-
-ENTRY(efi_call6)
+ENTRY(efi_call)
 	SAVE_XMM
 	mov (%rsp), %rax
 	mov 8(%rax), %rax
@@ -166,7 +89,7 @@ ENTRY(efi_call6)
 	addq $48, %rsp
 	RESTORE_XMM
 	ret
-ENDPROC(efi_call6)
+ENDPROC(efi_call)
 
 #ifdef CONFIG_EFI_MIXED
 
diff --git a/arch/x86/platform/uv/bios_uv.c b/arch/x86/platform/uv/bios_uv.c
index 766612137a62..1584cbed0dce 100644
--- a/arch/x86/platform/uv/bios_uv.c
+++ b/arch/x86/platform/uv/bios_uv.c
@@ -39,7 +39,7 @@ s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
 		 */
 		return BIOS_STATUS_UNIMPLEMENTED;
 
-	ret = efi_call6((void *)__va(tab->function), (u64)which,
+	ret = efi_call((void *)__va(tab->function), (u64)which,
 			a1, a2, a3, a4, a5);
 	return ret;
 }