Commit 582b01b6 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Borislav Petkov
Browse files

x86/fpu: Remove old KVM FPU interface 



No more users.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20211022185313.074853631@linutronix.de
parent d69c1382

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

+0 −2
Original line number Diff line number Diff line
@@ -131,14 +131,12 @@ static inline void fpstate_init_soft(struct swregs_state *soft) {} 
DECLARE_PER_CPU(struct fpu *, fpu_fpregs_owner_ctx);



/* fpstate-related functions which are exported to KVM */

extern void fpu_init_fpstate_user(struct fpu *fpu);

extern void fpstate_clear_xstate_component(struct fpstate *fps, unsigned int xfeature);



/* KVM specific functions */

extern bool fpu_alloc_guest_fpstate(struct fpu_guest *gfpu);

extern void fpu_free_guest_fpstate(struct fpu_guest *gfpu);

extern int fpu_swap_kvm_fpstate(struct fpu_guest *gfpu, bool enter_guest);

extern void fpu_swap_kvm_fpu(struct fpu *save, struct fpu *rstor, u64 restore_mask);



extern void fpu_copy_guest_fpstate_to_uabi(struct fpu_guest *gfpu, void *buf, unsigned int size, u32 pkru);

extern int fpu_copy_uabi_to_guest_fpstate(struct fpu_guest *gfpu, const void *buf, u64 xcr0, u32 *vpkru);

arch/x86/kernel/fpu/core.c

+0 −32
Original line number Diff line number Diff line
@@ -245,29 +245,6 @@ int fpu_swap_kvm_fpstate(struct fpu_guest *guest_fpu, bool enter_guest) 
}

EXPORT_SYMBOL_GPL(fpu_swap_kvm_fpstate);



void fpu_swap_kvm_fpu(struct fpu *save, struct fpu *rstor, u64 restore_mask)

{

	fpregs_lock();



	if (save) {

		struct fpstate *fpcur = current->thread.fpu.fpstate;



		if (test_thread_flag(TIF_NEED_FPU_LOAD))

			memcpy(&save->fpstate->regs, &fpcur->regs, fpcur->size);

		else

			save_fpregs_to_fpstate(save);

	}



	if (rstor) {

		restore_mask &= XFEATURE_MASK_FPSTATE;

		restore_fpregs_from_fpstate(rstor->fpstate, restore_mask);

	}



	fpregs_mark_activate();

	fpregs_unlock();

}

EXPORT_SYMBOL_GPL(fpu_swap_kvm_fpu);



void fpu_copy_guest_fpstate_to_uabi(struct fpu_guest *gfpu, void *buf,

				    unsigned int size, u32 pkru)

{
@@ -437,15 +414,6 @@ void fpstate_reset(struct fpu *fpu) 
	__fpstate_reset(fpu->fpstate);

}



#if IS_ENABLED(CONFIG_KVM)

void fpu_init_fpstate_user(struct fpu *fpu)

{

	fpstate_reset(fpu);

	fpstate_init_user(fpu->fpstate);

}

EXPORT_SYMBOL_GPL(fpu_init_fpstate_user);

#endif



/* Clone current's FPU state on fork */

int fpu_clone(struct task_struct *dst)

{