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x86/fpu: Convert task_struct::thread.fpu accesses to use x86_task_fpu()

Browse Source 
This will make the removal of the task_struct::thread.fpu array
easier.

No change in functionality - code generated before and after this
commit is identical on x86-defconfig:

  kepler:~/tip> diff -up vmlinux.before.asm vmlinux.after.asm
  kepler:~/tip>

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Chang S. Bae <chang.seok.bae@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Link: https://lore.kernel.org/r/20250409211127.3544993-3-mingo@kernel.org
This commit is contained in:
Ingo Molnar
2025-04-09 23:11:21 +02:00
parent 77fbccede6
commit e3bfa38599
15 changed files with 68 additions and 68 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/fpu/sched.h
View File

@@ -41,7 +41,7 @@ static inline void switch_fpu_prepare(struct task_struct *old, int cpu)
{ {
if (cpu_feature_enabled(X86_FEATURE_FPU) && if (cpu_feature_enabled(X86_FEATURE_FPU) &&
!(old->flags & (PF_KTHREAD | PF_USER_WORKER))) { !(old->flags & (PF_KTHREAD | PF_USER_WORKER))) {
struct fpu *old_fpu = &old->thread.fpu; struct fpu *old_fpu = x86_task_fpu(old);
save_fpregs_to_fpstate(old_fpu); save_fpregs_to_fpstate(old_fpu);
/* /*

4
arch/x86/kernel/fpu/context.h
View File

@@ -53,7 +53,7 @@ static inline void fpregs_activate(struct fpu *fpu)
/* Internal helper for switch_fpu_return() and signal frame setup */ /* Internal helper for switch_fpu_return() and signal frame setup */
static inline void fpregs_restore_userregs(void) static inline void fpregs_restore_userregs(void)
{ {
struct fpu *fpu = &current->thread.fpu; struct fpu *fpu = x86_task_fpu(current);
int cpu = smp_processor_id(); int cpu = smp_processor_id();
if (WARN_ON_ONCE(current->flags & (PF_KTHREAD | PF_USER_WORKER))) if (WARN_ON_ONCE(current->flags & (PF_KTHREAD | PF_USER_WORKER)))
@@ -67,7 +67,7 @@ static inline void fpregs_restore_userregs(void)
* If PKRU is enabled, then the PKRU value is already * If PKRU is enabled, then the PKRU value is already
* correct because it was either set in switch_to() or in * correct because it was either set in switch_to() or in
* flush_thread(). So it is excluded because it might be * flush_thread(). So it is excluded because it might be
* not up to date in current->thread.fpu.xsave state. * not up to date in current->thread.fpu->xsave state.
* *
* XFD state is handled in restore_fpregs_from_fpstate(). * XFD state is handled in restore_fpregs_from_fpstate().
*/ */

30
arch/x86/kernel/fpu/core.c
View File

@@ -211,7 +211,7 @@ static void fpu_init_guest_permissions(struct fpu_guest *gfpu)
return; return;
spin_lock_irq(&current->sighand->siglock); spin_lock_irq(&current->sighand->siglock);
fpuperm = &current->group_leader->thread.fpu.guest_perm; fpuperm = &x86_task_fpu(current->group_leader)->guest_perm;
perm = fpuperm->__state_perm; perm = fpuperm->__state_perm;
/* First fpstate allocation locks down permissions. */ /* First fpstate allocation locks down permissions. */
@@ -323,7 +323,7 @@ EXPORT_SYMBOL_GPL(fpu_update_guest_xfd);
*/ */
void fpu_sync_guest_vmexit_xfd_state(void) void fpu_sync_guest_vmexit_xfd_state(void)
{ {
struct fpstate *fps = current->thread.fpu.fpstate; struct fpstate *fps = x86_task_fpu(current)->fpstate;
lockdep_assert_irqs_disabled(); lockdep_assert_irqs_disabled();
if (fpu_state_size_dynamic()) { if (fpu_state_size_dynamic()) {
@@ -337,7 +337,7 @@ EXPORT_SYMBOL_GPL(fpu_sync_guest_vmexit_xfd_state);
int fpu_swap_kvm_fpstate(struct fpu_guest *guest_fpu, bool enter_guest) int fpu_swap_kvm_fpstate(struct fpu_guest *guest_fpu, bool enter_guest)
{ {
struct fpstate *guest_fps = guest_fpu->fpstate; struct fpstate *guest_fps = guest_fpu->fpstate;
struct fpu *fpu = &current->thread.fpu; struct fpu *fpu = x86_task_fpu(current);
struct fpstate *cur_fps = fpu->fpstate; struct fpstate *cur_fps = fpu->fpstate;
fpregs_lock(); fpregs_lock();
@@ -438,7 +438,7 @@ void kernel_fpu_begin_mask(unsigned int kfpu_mask)
if (!(current->flags & (PF_KTHREAD | PF_USER_WORKER)) && if (!(current->flags & (PF_KTHREAD | PF_USER_WORKER)) &&
!test_thread_flag(TIF_NEED_FPU_LOAD)) { !test_thread_flag(TIF_NEED_FPU_LOAD)) {
set_thread_flag(TIF_NEED_FPU_LOAD); set_thread_flag(TIF_NEED_FPU_LOAD);
save_fpregs_to_fpstate(&current->thread.fpu); save_fpregs_to_fpstate(x86_task_fpu(current));
} }
__cpu_invalidate_fpregs_state(); __cpu_invalidate_fpregs_state();
@@ -467,7 +467,7 @@ EXPORT_SYMBOL_GPL(kernel_fpu_end);
*/ */
void fpu_sync_fpstate(struct fpu *fpu) void fpu_sync_fpstate(struct fpu *fpu)
{ {
WARN_ON_FPU(fpu != &current->thread.fpu); WARN_ON_FPU(fpu != x86_task_fpu(current));
fpregs_lock(); fpregs_lock();
trace_x86_fpu_before_save(fpu); trace_x86_fpu_before_save(fpu);
@@ -552,7 +552,7 @@ void fpstate_reset(struct fpu *fpu)
static inline void fpu_inherit_perms(struct fpu *dst_fpu) static inline void fpu_inherit_perms(struct fpu *dst_fpu)
{ {
if (fpu_state_size_dynamic()) { if (fpu_state_size_dynamic()) {
struct fpu *src_fpu = &current->group_leader->thread.fpu; struct fpu *src_fpu = x86_task_fpu(current->group_leader);
spin_lock_irq(&current->sighand->siglock); spin_lock_irq(&current->sighand->siglock);
/* Fork also inherits the permissions of the parent */ /* Fork also inherits the permissions of the parent */
@@ -572,7 +572,7 @@ static int update_fpu_shstk(struct task_struct *dst, unsigned long ssp)
if (!ssp) if (!ssp)
return 0; return 0;
xstate = get_xsave_addr(&dst->thread.fpu.fpstate->regs.xsave, xstate = get_xsave_addr(&x86_task_fpu(dst)->fpstate->regs.xsave,
XFEATURE_CET_USER); XFEATURE_CET_USER);
/* /*
@@ -593,8 +593,8 @@ static int update_fpu_shstk(struct task_struct *dst, unsigned long ssp)
int fpu_clone(struct task_struct *dst, unsigned long clone_flags, bool minimal, int fpu_clone(struct task_struct *dst, unsigned long clone_flags, bool minimal,
unsigned long ssp) unsigned long ssp)
{ {
struct fpu *src_fpu = &current->thread.fpu; struct fpu *src_fpu = x86_task_fpu(current);
struct fpu *dst_fpu = &dst->thread.fpu; struct fpu *dst_fpu = x86_task_fpu(dst);
/* The new task's FPU state cannot be valid in the hardware. */ /* The new task's FPU state cannot be valid in the hardware. */
dst_fpu->last_cpu = -1; dst_fpu->last_cpu = -1;
@@ -686,7 +686,7 @@ void fpu__drop(struct fpu *fpu)
{ {
preempt_disable(); preempt_disable();
if (fpu == &current->thread.fpu) { if (fpu == x86_task_fpu(current)) {
/* Ignore delayed exceptions from user space */ /* Ignore delayed exceptions from user space */
asm volatile("1: fwait\n" asm volatile("1: fwait\n"
"2:\n" "2:\n"
@@ -720,7 +720,7 @@ static inline void restore_fpregs_from_init_fpstate(u64 features_mask)
*/ */
static void fpu_reset_fpregs(void) static void fpu_reset_fpregs(void)
{ {
struct fpu *fpu = &current->thread.fpu; struct fpu *fpu = x86_task_fpu(current);
fpregs_lock(); fpregs_lock();
__fpu_invalidate_fpregs_state(fpu); __fpu_invalidate_fpregs_state(fpu);
@@ -749,7 +749,7 @@ static void fpu_reset_fpregs(void)
*/ */
void fpu__clear_user_states(struct fpu *fpu) void fpu__clear_user_states(struct fpu *fpu)
{ {
WARN_ON_FPU(fpu != &current->thread.fpu); WARN_ON_FPU(fpu != x86_task_fpu(current));
fpregs_lock(); fpregs_lock();
if (!cpu_feature_enabled(X86_FEATURE_FPU)) { if (!cpu_feature_enabled(X86_FEATURE_FPU)) {
@@ -782,7 +782,7 @@ void fpu__clear_user_states(struct fpu *fpu)
void fpu_flush_thread(void) void fpu_flush_thread(void)
{ {
fpstate_reset(&current->thread.fpu); fpstate_reset(x86_task_fpu(current));
fpu_reset_fpregs(); fpu_reset_fpregs();
} }
/* /*
@@ -823,7 +823,7 @@ void fpregs_lock_and_load(void)
*/ */
void fpregs_assert_state_consistent(void) void fpregs_assert_state_consistent(void)
{ {
struct fpu *fpu = &current->thread.fpu; struct fpu *fpu = x86_task_fpu(current);
if (test_thread_flag(TIF_NEED_FPU_LOAD)) if (test_thread_flag(TIF_NEED_FPU_LOAD))
return; return;
@@ -835,7 +835,7 @@ EXPORT_SYMBOL_GPL(fpregs_assert_state_consistent);
void fpregs_mark_activate(void) void fpregs_mark_activate(void)
{ {
struct fpu *fpu = &current->thread.fpu; struct fpu *fpu = x86_task_fpu(current);
fpregs_activate(fpu); fpregs_activate(fpu);
fpu->last_cpu = smp_processor_id(); fpu->last_cpu = smp_processor_id();

8
arch/x86/kernel/fpu/init.c
View File

@@ -38,7 +38,7 @@ static void fpu__init_cpu_generic(void)
/* Flush out any pending x87 state: */ /* Flush out any pending x87 state: */
#ifdef CONFIG_MATH_EMULATION #ifdef CONFIG_MATH_EMULATION
if (!boot_cpu_has(X86_FEATURE_FPU)) if (!boot_cpu_has(X86_FEATURE_FPU))
fpstate_init_soft(&current->thread.fpu.fpstate->regs.soft); fpstate_init_soft(&x86_task_fpu(current)->fpstate->regs.soft);
else else
#endif #endif
asm volatile ("fninit"); asm volatile ("fninit");
@@ -154,7 +154,7 @@ static void __init fpu__init_task_struct_size(void)
* Subtract off the static size of the register state. * Subtract off the static size of the register state.
* It potentially has a bunch of padding. * It potentially has a bunch of padding.
*/ */
task_size -= sizeof(current->thread.fpu.__fpstate.regs); task_size -= sizeof(union fpregs_state);
/* /*
* Add back the dynamically-calculated register state * Add back the dynamically-calculated register state
@@ -204,7 +204,7 @@ static void __init fpu__init_system_xstate_size_legacy(void)
fpu_kernel_cfg.default_size = size; fpu_kernel_cfg.default_size = size;
fpu_user_cfg.max_size = size; fpu_user_cfg.max_size = size;
fpu_user_cfg.default_size = size; fpu_user_cfg.default_size = size;
fpstate_reset(&current->thread.fpu); fpstate_reset(x86_task_fpu(current));
} }
/* /*
@@ -213,7 +213,7 @@ static void __init fpu__init_system_xstate_size_legacy(void)
*/ */
void __init fpu__init_system(void) void __init fpu__init_system(void)
{ {
fpstate_reset(&current->thread.fpu); fpstate_reset(x86_task_fpu(current));
fpu__init_system_early_generic(); fpu__init_system_early_generic();
/* /*

22
arch/x86/kernel/fpu/regset.c
View File

@@ -45,7 +45,7 @@ int regset_xregset_fpregs_active(struct task_struct *target, const struct user_r
*/ */
static void sync_fpstate(struct fpu *fpu) static void sync_fpstate(struct fpu *fpu)
{ {
if (fpu == &current->thread.fpu) if (fpu == x86_task_fpu(current))
fpu_sync_fpstate(fpu); fpu_sync_fpstate(fpu);
} }
@@ -63,7 +63,7 @@ static void fpu_force_restore(struct fpu *fpu)
* Only stopped child tasks can be used to modify the FPU * Only stopped child tasks can be used to modify the FPU
* state in the fpstate buffer: * state in the fpstate buffer:
*/ */
WARN_ON_FPU(fpu == &current->thread.fpu); WARN_ON_FPU(fpu == x86_task_fpu(current));
__fpu_invalidate_fpregs_state(fpu); __fpu_invalidate_fpregs_state(fpu);
} }
@@ -71,7 +71,7 @@ static void fpu_force_restore(struct fpu *fpu)
int xfpregs_get(struct task_struct *target, const struct user_regset *regset, int xfpregs_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to) struct membuf to)
{ {
struct fpu *fpu = &target->thread.fpu; struct fpu *fpu = x86_task_fpu(target);
if (!cpu_feature_enabled(X86_FEATURE_FXSR)) if (!cpu_feature_enabled(X86_FEATURE_FXSR))
return -ENODEV; return -ENODEV;
@@ -91,7 +91,7 @@ int xfpregs_set(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count, unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf) const void *kbuf, const void __user *ubuf)
{ {
struct fpu *fpu = &target->thread.fpu; struct fpu *fpu = x86_task_fpu(target);
struct fxregs_state newstate; struct fxregs_state newstate;
int ret; int ret;
@@ -133,7 +133,7 @@ int xstateregs_get(struct task_struct *target, const struct user_regset *regset,
if (!cpu_feature_enabled(X86_FEATURE_XSAVE)) if (!cpu_feature_enabled(X86_FEATURE_XSAVE))
return -ENODEV; return -ENODEV;
sync_fpstate(&target->thread.fpu); sync_fpstate(x86_task_fpu(target));
copy_xstate_to_uabi_buf(to, target, XSTATE_COPY_XSAVE); copy_xstate_to_uabi_buf(to, target, XSTATE_COPY_XSAVE);
return 0; return 0;
@@ -143,7 +143,7 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count, unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf) const void *kbuf, const void __user *ubuf)
{ {
struct fpu *fpu = &target->thread.fpu; struct fpu *fpu = x86_task_fpu(target);
struct xregs_state *tmpbuf = NULL; struct xregs_state *tmpbuf = NULL;
int ret; int ret;
@@ -187,7 +187,7 @@ int ssp_active(struct task_struct *target, const struct user_regset *regset)
int ssp_get(struct task_struct *target, const struct user_regset *regset, int ssp_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to) struct membuf to)
{ {
struct fpu *fpu = &target->thread.fpu; struct fpu *fpu = x86_task_fpu(target);
struct cet_user_state *cetregs; struct cet_user_state *cetregs;
if (!cpu_feature_enabled(X86_FEATURE_USER_SHSTK) || if (!cpu_feature_enabled(X86_FEATURE_USER_SHSTK) ||
@@ -214,7 +214,7 @@ int ssp_set(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count, unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf) const void *kbuf, const void __user *ubuf)
{ {
struct fpu *fpu = &target->thread.fpu; struct fpu *fpu = x86_task_fpu(target);
struct xregs_state *xsave = &fpu->fpstate->regs.xsave; struct xregs_state *xsave = &fpu->fpstate->regs.xsave;
struct cet_user_state *cetregs; struct cet_user_state *cetregs;
unsigned long user_ssp; unsigned long user_ssp;
@@ -368,7 +368,7 @@ static void __convert_from_fxsr(struct user_i387_ia32_struct *env,
void void
convert_from_fxsr(struct user_i387_ia32_struct *env, struct task_struct *tsk) convert_from_fxsr(struct user_i387_ia32_struct *env, struct task_struct *tsk)
{ {
__convert_from_fxsr(env, tsk, &tsk->thread.fpu.fpstate->regs.fxsave); __convert_from_fxsr(env, tsk, &x86_task_fpu(tsk)->fpstate->regs.fxsave);
} }
void convert_to_fxsr(struct fxregs_state *fxsave, void convert_to_fxsr(struct fxregs_state *fxsave,
@@ -401,7 +401,7 @@ void convert_to_fxsr(struct fxregs_state *fxsave,
int fpregs_get(struct task_struct *target, const struct user_regset *regset, int fpregs_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to) struct membuf to)
{ {
struct fpu *fpu = &target->thread.fpu; struct fpu *fpu = x86_task_fpu(target);
struct user_i387_ia32_struct env; struct user_i387_ia32_struct env;
struct fxregs_state fxsave, *fx; struct fxregs_state fxsave, *fx;
@@ -433,7 +433,7 @@ int fpregs_set(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count, unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf) const void *kbuf, const void __user *ubuf)
{ {
struct fpu *fpu = &target->thread.fpu; struct fpu *fpu = x86_task_fpu(target);
struct user_i387_ia32_struct env; struct user_i387_ia32_struct env;
int ret; int ret;

18
arch/x86/kernel/fpu/signal.c
View File

@@ -43,13 +43,13 @@ static inline bool check_xstate_in_sigframe(struct fxregs_state __user *fxbuf,
* fpstate layout with out copying the extended state information * fpstate layout with out copying the extended state information
* in the memory layout. * in the memory layout.
*/ */
if (__get_user(magic2, (__u32 __user *)(fpstate + current->thread.fpu.fpstate->user_size))) if (__get_user(magic2, (__u32 __user *)(fpstate + x86_task_fpu(current)->fpstate->user_size)))
return false; return false;
if (likely(magic2 == FP_XSTATE_MAGIC2)) if (likely(magic2 == FP_XSTATE_MAGIC2))
return true; return true;
setfx: setfx:
trace_x86_fpu_xstate_check_failed(&current->thread.fpu); trace_x86_fpu_xstate_check_failed(x86_task_fpu(current));
/* Set the parameters for fx only state */ /* Set the parameters for fx only state */
fx_sw->magic1 = 0; fx_sw->magic1 = 0;
@@ -64,13 +64,13 @@ setfx:
static inline bool save_fsave_header(struct task_struct *tsk, void __user *buf) static inline bool save_fsave_header(struct task_struct *tsk, void __user *buf)
{ {
if (use_fxsr()) { if (use_fxsr()) {
struct xregs_state *xsave = &tsk->thread.fpu.fpstate->regs.xsave; struct xregs_state *xsave = &x86_task_fpu(tsk)->fpstate->regs.xsave;
struct user_i387_ia32_struct env; struct user_i387_ia32_struct env;
struct _fpstate_32 __user *fp = buf; struct _fpstate_32 __user *fp = buf;
fpregs_lock(); fpregs_lock();
if (!test_thread_flag(TIF_NEED_FPU_LOAD)) if (!test_thread_flag(TIF_NEED_FPU_LOAD))
fxsave(&tsk->thread.fpu.fpstate->regs.fxsave); fxsave(&x86_task_fpu(tsk)->fpstate->regs.fxsave);
fpregs_unlock(); fpregs_unlock();
convert_from_fxsr(&env, tsk); convert_from_fxsr(&env, tsk);
@@ -184,7 +184,7 @@ static inline int copy_fpregs_to_sigframe(struct xregs_state __user *buf, u32 pk
bool copy_fpstate_to_sigframe(void __user *buf, void __user *buf_fx, int size, u32 pkru) bool copy_fpstate_to_sigframe(void __user *buf, void __user *buf_fx, int size, u32 pkru)
{ {
struct task_struct *tsk = current; struct task_struct *tsk = current;
struct fpstate *fpstate = tsk->thread.fpu.fpstate; struct fpstate *fpstate = x86_task_fpu(tsk)->fpstate;
bool ia32_fxstate = (buf != buf_fx); bool ia32_fxstate = (buf != buf_fx);
int ret; int ret;
@@ -272,7 +272,7 @@ static int __restore_fpregs_from_user(void __user *buf, u64 ufeatures,
*/ */
static bool restore_fpregs_from_user(void __user *buf, u64 xrestore, bool fx_only) static bool restore_fpregs_from_user(void __user *buf, u64 xrestore, bool fx_only)
{ {
struct fpu *fpu = &current->thread.fpu; struct fpu *fpu = x86_task_fpu(current);
int ret; int ret;
/* Restore enabled features only. */ /* Restore enabled features only. */
@@ -332,7 +332,7 @@ static bool __fpu_restore_sig(void __user *buf, void __user *buf_fx,
bool ia32_fxstate) bool ia32_fxstate)
{ {
struct task_struct *tsk = current; struct task_struct *tsk = current;
struct fpu *fpu = &tsk->thread.fpu; struct fpu *fpu = x86_task_fpu(tsk);
struct user_i387_ia32_struct env; struct user_i387_ia32_struct env;
bool success, fx_only = false; bool success, fx_only = false;
union fpregs_state *fpregs; union fpregs_state *fpregs;
@@ -452,7 +452,7 @@ static inline unsigned int xstate_sigframe_size(struct fpstate *fpstate)
*/ */
bool fpu__restore_sig(void __user *buf, int ia32_frame) bool fpu__restore_sig(void __user *buf, int ia32_frame)
{ {
struct fpu *fpu = &current->thread.fpu; struct fpu *fpu = x86_task_fpu(current);
void __user *buf_fx = buf; void __user *buf_fx = buf;
bool ia32_fxstate = false; bool ia32_fxstate = false;
bool success = false; bool success = false;
@@ -499,7 +499,7 @@ unsigned long
fpu__alloc_mathframe(unsigned long sp, int ia32_frame, fpu__alloc_mathframe(unsigned long sp, int ia32_frame,
unsigned long *buf_fx, unsigned long *size) unsigned long *buf_fx, unsigned long *size)
{ {
unsigned long frame_size = xstate_sigframe_size(current->thread.fpu.fpstate); unsigned long frame_size = xstate_sigframe_size(x86_task_fpu(current)->fpstate);
*buf_fx = sp = round_down(sp - frame_size, 64); *buf_fx = sp = round_down(sp - frame_size, 64);
if (ia32_frame && use_fxsr()) { if (ia32_frame && use_fxsr()) {

22
arch/x86/kernel/fpu/xstate.c
View File

@@ -763,7 +763,7 @@ static void __init fpu__init_disable_system_xstate(unsigned int legacy_size)
*/ */
init_fpstate.xfd = 0; init_fpstate.xfd = 0;
fpstate_reset(&current->thread.fpu); fpstate_reset(x86_task_fpu(current));
} }
/* /*
@@ -871,7 +871,7 @@ void __init fpu__init_system_xstate(unsigned int legacy_size)
goto out_disable; goto out_disable;
/* Reset the state for the current task */ /* Reset the state for the current task */
fpstate_reset(&current->thread.fpu); fpstate_reset(x86_task_fpu(current));
/* /*
* Update info used for ptrace frames; use standard-format size and no * Update info used for ptrace frames; use standard-format size and no
@@ -945,7 +945,7 @@ void fpu__resume_cpu(void)
} }
if (fpu_state_size_dynamic()) if (fpu_state_size_dynamic())
wrmsrl(MSR_IA32_XFD, current->thread.fpu.fpstate->xfd); wrmsrl(MSR_IA32_XFD, x86_task_fpu(current)->fpstate->xfd);
} }
/* /*
@@ -1227,8 +1227,8 @@ out:
void copy_xstate_to_uabi_buf(struct membuf to, struct task_struct *tsk, void copy_xstate_to_uabi_buf(struct membuf to, struct task_struct *tsk,
enum xstate_copy_mode copy_mode) enum xstate_copy_mode copy_mode)
{ {
__copy_xstate_to_uabi_buf(to, tsk->thread.fpu.fpstate, __copy_xstate_to_uabi_buf(to, x86_task_fpu(tsk)->fpstate,
tsk->thread.fpu.fpstate->user_xfeatures, x86_task_fpu(tsk)->fpstate->user_xfeatures,
tsk->thread.pkru, copy_mode); tsk->thread.pkru, copy_mode);
} }
@@ -1368,7 +1368,7 @@ int copy_uabi_from_kernel_to_xstate(struct fpstate *fpstate, const void *kbuf, u
int copy_sigframe_from_user_to_xstate(struct task_struct *tsk, int copy_sigframe_from_user_to_xstate(struct task_struct *tsk,
const void __user *ubuf) const void __user *ubuf)
{ {
return copy_uabi_to_xstate(tsk->thread.fpu.fpstate, NULL, ubuf, &tsk->thread.pkru); return copy_uabi_to_xstate(x86_task_fpu(tsk)->fpstate, NULL, ubuf, &tsk->thread.pkru);
} }
static bool validate_independent_components(u64 mask) static bool validate_independent_components(u64 mask)
@@ -1462,7 +1462,7 @@ static bool xstate_op_valid(struct fpstate *fpstate, u64 mask, bool rstor)
* The XFD MSR does not match fpstate->xfd. That's invalid when * The XFD MSR does not match fpstate->xfd. That's invalid when
* the passed in fpstate is current's fpstate. * the passed in fpstate is current's fpstate.
*/ */
if (fpstate->xfd == current->thread.fpu.fpstate->xfd) if (fpstate->xfd == x86_task_fpu(current)->fpstate->xfd)
return false; return false;
/* /*
@@ -1539,7 +1539,7 @@ void fpstate_free(struct fpu *fpu)
static int fpstate_realloc(u64 xfeatures, unsigned int ksize, static int fpstate_realloc(u64 xfeatures, unsigned int ksize,
unsigned int usize, struct fpu_guest *guest_fpu) unsigned int usize, struct fpu_guest *guest_fpu)
{ {
struct fpu *fpu = &current->thread.fpu; struct fpu *fpu = x86_task_fpu(current);
struct fpstate *curfps, *newfps = NULL; struct fpstate *curfps, *newfps = NULL;
unsigned int fpsize; unsigned int fpsize;
bool in_use; bool in_use;
@@ -1632,7 +1632,7 @@ static int __xstate_request_perm(u64 permitted, u64 requested, bool guest)
* AVX512. * AVX512.
*/ */
bool compacted = cpu_feature_enabled(X86_FEATURE_XCOMPACTED); bool compacted = cpu_feature_enabled(X86_FEATURE_XCOMPACTED);
struct fpu *fpu = &current->group_leader->thread.fpu; struct fpu *fpu = x86_task_fpu(current->group_leader);
struct fpu_state_perm *perm; struct fpu_state_perm *perm;
unsigned int ksize, usize; unsigned int ksize, usize;
u64 mask; u64 mask;
@@ -1735,7 +1735,7 @@ int __xfd_enable_feature(u64 xfd_err, struct fpu_guest *guest_fpu)
return -EPERM; return -EPERM;
} }
fpu = &current->group_leader->thread.fpu; fpu = x86_task_fpu(current->group_leader);
perm = guest_fpu ? &fpu->guest_perm : &fpu->perm; perm = guest_fpu ? &fpu->guest_perm : &fpu->perm;
ksize = perm->__state_size; ksize = perm->__state_size;
usize = perm->__user_state_size; usize = perm->__user_state_size;
@@ -1840,7 +1840,7 @@ long fpu_xstate_prctl(int option, unsigned long arg2)
*/ */
static void avx512_status(struct seq_file *m, struct task_struct *task) static void avx512_status(struct seq_file *m, struct task_struct *task)
{ {
unsigned long timestamp = READ_ONCE(task->thread.fpu.avx512_timestamp); unsigned long timestamp = READ_ONCE(x86_task_fpu(task)->avx512_timestamp);
long delta; long delta;
if (!timestamp) { if (!timestamp) {

6
arch/x86/kernel/fpu/xstate.h
View File

@@ -22,7 +22,7 @@ static inline void xstate_init_xcomp_bv(struct xregs_state *xsave, u64 mask)
static inline u64 xstate_get_group_perm(bool guest) static inline u64 xstate_get_group_perm(bool guest)
{ {
struct fpu *fpu = &current->group_leader->thread.fpu; struct fpu *fpu = x86_task_fpu(current->group_leader);
struct fpu_state_perm *perm; struct fpu_state_perm *perm;
/* Pairs with WRITE_ONCE() in xstate_request_perm() */ /* Pairs with WRITE_ONCE() in xstate_request_perm() */
@@ -288,7 +288,7 @@ static inline int xsave_to_user_sigframe(struct xregs_state __user *buf, u32 pkr
* internally, e.g. PKRU. That's user space ABI and also required * internally, e.g. PKRU. That's user space ABI and also required
* to allow the signal handler to modify PKRU. * to allow the signal handler to modify PKRU.
*/ */
struct fpstate *fpstate = current->thread.fpu.fpstate; struct fpstate *fpstate = x86_task_fpu(current)->fpstate;
u64 mask = fpstate->user_xfeatures; u64 mask = fpstate->user_xfeatures;
u32 lmask; u32 lmask;
u32 hmask; u32 hmask;
@@ -322,7 +322,7 @@ static inline int xrstor_from_user_sigframe(struct xregs_state __user *buf, u64
u32 hmask = mask >> 32; u32 hmask = mask >> 32;
int err; int err;
xfd_validate_state(current->thread.fpu.fpstate, mask, true); xfd_validate_state(x86_task_fpu(current)->fpstate, mask, true);
stac(); stac();
XSTATE_OP(XRSTOR, xstate, lmask, hmask, err); XSTATE_OP(XRSTOR, xstate, lmask, hmask, err);

6
arch/x86/kernel/process.c
View File

@@ -103,7 +103,7 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
dst->thread.vm86 = NULL; dst->thread.vm86 = NULL;
#endif #endif
/* Drop the copied pointer to current's fpstate */ /* Drop the copied pointer to current's fpstate */
dst->thread.fpu.fpstate = NULL; x86_task_fpu(dst)->fpstate = NULL;
return 0; return 0;
} }
@@ -112,7 +112,7 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
void arch_release_task_struct(struct task_struct *tsk) void arch_release_task_struct(struct task_struct *tsk)
{ {
if (fpu_state_size_dynamic()) if (fpu_state_size_dynamic())
fpstate_free(&tsk->thread.fpu); fpstate_free(x86_task_fpu(tsk));
} }
#endif #endif
@@ -122,7 +122,7 @@ void arch_release_task_struct(struct task_struct *tsk)
void exit_thread(struct task_struct *tsk) void exit_thread(struct task_struct *tsk)
{ {
struct thread_struct *t = &tsk->thread; struct thread_struct *t = &tsk->thread;
struct fpu *fpu = &t->fpu; struct fpu *fpu = x86_task_fpu(tsk);
if (test_thread_flag(TIF_IO_BITMAP)) if (test_thread_flag(TIF_IO_BITMAP))
io_bitmap_exit(tsk); io_bitmap_exit(tsk);

6
arch/x86/kernel/signal.c
View File

@@ -255,7 +255,7 @@ static void
handle_signal(struct ksignal *ksig, struct pt_regs *regs) handle_signal(struct ksignal *ksig, struct pt_regs *regs)
{ {
bool stepping, failed; bool stepping, failed;
struct fpu *fpu = &current->thread.fpu; struct fpu *fpu = x86_task_fpu(current);
if (v8086_mode(regs)) if (v8086_mode(regs))
save_v86_state((struct kernel_vm86_regs *) regs, VM86_SIGNAL); save_v86_state((struct kernel_vm86_regs *) regs, VM86_SIGNAL);
@@ -423,14 +423,14 @@ bool sigaltstack_size_valid(size_t ss_size)
if (!fpu_state_size_dynamic() && !strict_sigaltstack_size) if (!fpu_state_size_dynamic() && !strict_sigaltstack_size)
return true; return true;
fsize += current->group_leader->thread.fpu.perm.__user_state_size; fsize += x86_task_fpu(current->group_leader)->perm.__user_state_size;
if (likely(ss_size > fsize)) if (likely(ss_size > fsize))
return true; return true;
if (strict_sigaltstack_size) if (strict_sigaltstack_size)
return ss_size > fsize; return ss_size > fsize;
mask = current->group_leader->thread.fpu.perm.__state_perm; mask = x86_task_fpu(current->group_leader)->perm.__state_perm;
if (mask & XFEATURE_MASK_USER_DYNAMIC) if (mask & XFEATURE_MASK_USER_DYNAMIC)
return ss_size > fsize; return ss_size > fsize;

2
arch/x86/kernel/traps.c
View File

@@ -1295,7 +1295,7 @@ DEFINE_IDTENTRY_RAW(exc_debug)
static void math_error(struct pt_regs *regs, int trapnr) static void math_error(struct pt_regs *regs, int trapnr)
{ {
struct task_struct *task = current; struct task_struct *task = current;
struct fpu *fpu = &task->thread.fpu; struct fpu *fpu = x86_task_fpu(task);
int si_code; int si_code;
char *str = (trapnr == X86_TRAP_MF) ? "fpu exception" : char *str = (trapnr == X86_TRAP_MF) ? "fpu exception" :
"simd exception"; "simd exception";

2
arch/x86/math-emu/fpu_aux.c
View File

@@ -53,7 +53,7 @@ void fpstate_init_soft(struct swregs_state *soft)
void finit(void) void finit(void)
{ {
fpstate_init_soft(&current->thread.fpu.fpstate->regs.soft); fpstate_init_soft(&x86_task_fpu(current)->fpstate->regs.soft);
} }
/* /*

4
arch/x86/math-emu/fpu_entry.c
View File

@@ -641,7 +641,7 @@ int fpregs_soft_set(struct task_struct *target,
unsigned int pos, unsigned int count, unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf) const void *kbuf, const void __user *ubuf)
{ {
struct swregs_state *s387 = &target->thread.fpu.fpstate->regs.soft; struct swregs_state *s387 = &x86_task_fpu(target)->fpstate->regs.soft;
void *space = s387->st_space; void *space = s387->st_space;
int ret; int ret;
int offset, other, i, tags, regnr, tag, newtop; int offset, other, i, tags, regnr, tag, newtop;
@@ -692,7 +692,7 @@ int fpregs_soft_get(struct task_struct *target,
const struct user_regset *regset, const struct user_regset *regset,
struct membuf to) struct membuf to)
{ {
struct swregs_state *s387 = &target->thread.fpu.fpstate->regs.soft; struct swregs_state *s387 = &x86_task_fpu(target)->fpstate->regs.soft;
const void *space = s387->st_space; const void *space = s387->st_space;
int offset = (S387->ftop & 7) * 10, other = 80 - offset; int offset = (S387->ftop & 7) * 10, other = 80 - offset;

2
arch/x86/math-emu/fpu_system.h
View File

@@ -73,7 +73,7 @@ static inline bool seg_writable(struct desc_struct *d)
return (d->type & SEG_TYPE_EXECUTE_MASK) == SEG_TYPE_WRITABLE; return (d->type & SEG_TYPE_EXECUTE_MASK) == SEG_TYPE_WRITABLE;
} }
#define I387 (&current->thread.fpu.fpstate->regs) #define I387 (&x86_task_fpu(current)->fpstate->regs)
#define FPU_info (I387->soft.info) #define FPU_info (I387->soft.info)
#define FPU_CS (*(unsigned short *) &(FPU_info->regs->cs)) #define FPU_CS (*(unsigned short *) &(FPU_info->regs->cs))

2
arch/x86/mm/extable.c
View File

@@ -111,7 +111,7 @@ static bool ex_handler_sgx(const struct exception_table_entry *fixup,
/* /*
* Handler for when we fail to restore a task's FPU state. We should never get * Handler for when we fail to restore a task's FPU state. We should never get
* here because the FPU state of a task using the FPU (task->thread.fpu.state) * here because the FPU state of a task using the FPU (struct fpu::fpstate)
* should always be valid. However, past bugs have allowed userspace to set * should always be valid. However, past bugs have allowed userspace to set
* reserved bits in the XSAVE area using PTRACE_SETREGSET or sys_rt_sigreturn(). * reserved bits in the XSAVE area using PTRACE_SETREGSET or sys_rt_sigreturn().
* These caused XRSTOR to fail when switching to the task, leaking the FPU * These caused XRSTOR to fail when switching to the task, leaking the FPU