x86/fpu/regset: Convert to fpstate

Convert regset related code to the new register storage mechanism in
preparation for dynamically sized buffers.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20211013145322.555239736@linutronix.de

diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c
index 01a1d97c3cb64904a03e288cb14782c24bd9372c..ec777793d890b23c346334417237068e19f9615c 100644 (file)
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -78,8 +78,8 @@ int xfpregs_get(struct task_struct *target, const struct user_regset *regset,
        sync_fpstate(fpu);
 
        if (!use_xsave()) {
-               return membuf_write(&to, &fpu->state.fxsave,
-                                   sizeof(fpu->state.fxsave));
+               return membuf_write(&to, &fpu->fpstate->regs.fxsave,
+                                   sizeof(fpu->fpstate->regs.fxsave));
        }
 
        copy_xstate_to_uabi_buf(to, target, XSTATE_COPY_FX);
@@ -114,15 +114,15 @@ int xfpregs_set(struct task_struct *target, const struct user_regset *regset,
        fpu_force_restore(fpu);
 
        /* Copy the state  */
-       memcpy(&fpu->state.fxsave, &newstate, sizeof(newstate));
+       memcpy(&fpu->fpstate->regs.fxsave, &newstate, sizeof(newstate));
 
        /* Clear xmm8..15 */
-       BUILD_BUG_ON(sizeof(fpu->state.fxsave.xmm_space) != 16 * 16);
-       memset(&fpu->state.fxsave.xmm_space[8], 0, 8 * 16);
+       BUILD_BUG_ON(sizeof(fpu->__fpstate.regs.fxsave.xmm_space) != 16 * 16);
+       memset(&fpu->fpstate->regs.fxsave.xmm_space[8], 0, 8 * 16);
 
        /* Mark FP and SSE as in use when XSAVE is enabled */
        if (use_xsave())
-               fpu->state.xsave.header.xfeatures |= XFEATURE_MASK_FPSSE;
+               fpu->fpstate->regs.xsave.header.xfeatures |= XFEATURE_MASK_FPSSE;
 
        return 0;
 }
@@ -168,7 +168,8 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
        }
 
        fpu_force_restore(fpu);
-       ret = copy_uabi_from_kernel_to_xstate(&fpu->state.xsave, kbuf ?: tmpbuf);
+       ret = copy_uabi_from_kernel_to_xstate(&fpu->fpstate->regs.xsave,
+                                             kbuf ?: tmpbuf);
 
 out:
        vfree(tmpbuf);
@@ -287,7 +288,7 @@ static void __convert_from_fxsr(struct user_i387_ia32_struct *env,
 void
 convert_from_fxsr(struct user_i387_ia32_struct *env, struct task_struct *tsk)
 {
-       __convert_from_fxsr(env, tsk, &tsk->thread.fpu.state.fxsave);
+       __convert_from_fxsr(env, tsk, &tsk->thread.fpu.fpstate->regs.fxsave);
 }
 
 void convert_to_fxsr(struct fxregs_state *fxsave,
@@ -330,7 +331,7 @@ int fpregs_get(struct task_struct *target, const struct user_regset *regset,
                return fpregs_soft_get(target, regset, to);
 
        if (!cpu_feature_enabled(X86_FEATURE_FXSR)) {
-               return membuf_write(&to, &fpu->state.fsave,
+               return membuf_write(&to, &fpu->fpstate->regs.fsave,
                                    sizeof(struct fregs_state));
        }
 
@@ -341,7 +342,7 @@ int fpregs_get(struct task_struct *target, const struct user_regset *regset,
                copy_xstate_to_uabi_buf(mb, target, XSTATE_COPY_FP);
                fx = &fxsave;
        } else {
-               fx = &fpu->state.fxsave;
+               fx = &fpu->fpstate->regs.fxsave;
        }
 
        __convert_from_fxsr(&env, target, fx);
@@ -370,16 +371,16 @@ int fpregs_set(struct task_struct *target, const struct user_regset *regset,
        fpu_force_restore(fpu);
 
        if (cpu_feature_enabled(X86_FEATURE_FXSR))
-               convert_to_fxsr(&fpu->state.fxsave, &env);
+               convert_to_fxsr(&fpu->fpstate->regs.fxsave, &env);
        else
-               memcpy(&fpu->state.fsave, &env, sizeof(env));
+               memcpy(&fpu->fpstate->regs.fsave, &env, sizeof(env));
 
        /*
         * Update the header bit in the xsave header, indicating the
         * presence of FP.
         */
        if (cpu_feature_enabled(X86_FEATURE_XSAVE))
-               fpu->state.xsave.header.xfeatures |= XFEATURE_MASK_FP;
+               fpu->fpstate->regs.xsave.header.xfeatures |= XFEATURE_MASK_FP;
 
        return 0;
 }