x86/fpu: Avoid kabi change caused by struct fpu

category: bugfix
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5RQLJ
CVE: NA

Intel-SIG: x86/fpu: Avoid kabi change caused by struct fpu.

--------------------------------

Assuming that struct fpu won't be accessed directly by drivers,
Using KABI_EXTEND and KABI_DEPRECATE macros to avoid kabi change caused by following
commits:
87d0e5be ("x86/fpu: Provide struct fpstate")
2f27b503 ("x86/fpu: Remove fpu::state")
75c52dad ("x86/fpu: Prepare for sanitizing KVM FPU code")
6f6a7c09 ("x86/fpu: Add members to struct fpu to cache permission
information")
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Signed-off-by: NLin Wang <lin.x.wang@intel.com>
Signed-off-by: NAichun Shi <aichun.shi@intel.com>

arch/x86/include/asm/fpu/types.h

@@ -5,6 +5,8 @@
 #ifndef _ASM_X86_FPU_H
 #define _ASM_X86_FPU_H
 
+#include <linux/kabi.h>
+
 /*
  * The legacy x87 FPU state format, as saved by FSAVE and
  * restored by the FRSTOR instructions:
@@ -459,7 +461,7 @@ struct fpu {
 	 * Pointer to the active struct fpstate. Initialized to
 	 * point at @__fpstate below.
 	 */
-	struct fpstate			*fpstate;
+	KABI_EXTEND(struct fpstate *fpstate)
 
 	/*
 	 * @__task_fpstate:
@@ -467,14 +469,14 @@ struct fpu {
 	 * Pointer to an inactive struct fpstate. Initialized to NULL. Is
 	 * used only for KVM support to swap out the regular task fpstate.
 	 */
-	struct fpstate			*__task_fpstate;
+	KABI_EXTEND(struct fpstate *__task_fpstate)
 
 	/*
 	 * @perm:
 	 *
 	 * Permission related information
 	 */
-	struct fpu_state_perm		perm;
+	KABI_EXTEND(struct fpu_state_perm perm)
 
 	/*
 	 * @__fpstate:
@@ -484,7 +486,8 @@ struct fpu {
 	 * are restored from this storage on return to user space if they
 	 * are not longer containing the tasks FPU register state.
 	 */
-	struct fpstate			__fpstate;
+	KABI_DEPRECATE(union fpregs_state, state)
+	KABI_EXTEND(struct fpstate __fpstate)
 	/*
 	 * WARNING: '__fpstate' is dynamically-sized.  Do not put
 	 * anything after it here.