diff options
| -rw-r--r-- | arch/x86/kernel/fpu/xstate.c | 34 | ||||
| -rw-r--r-- | arch/x86/kernel/fpu/xstate.h | 3 |
2 files changed, 29 insertions, 8 deletions
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c index eeeb807b9717..b2537a8203ee 100644 --- a/arch/x86/kernel/fpu/xstate.c +++ b/arch/x86/kernel/fpu/xstate.c @@ -940,9 +940,10 @@ static void copy_feature(bool from_xstate, struct membuf *to, void *xstate, } /** - * copy_xstate_to_uabi_buf - Copy kernel saved xstate to a UABI buffer + * __copy_xstate_to_uabi_buf - Copy kernel saved xstate to a UABI buffer * @to: membuf descriptor - * @tsk: The task from which to copy the saved xstate + * @xsave: The xsave from which to copy + * @pkru_val: The PKRU value to store in the PKRU component * @copy_mode: The requested copy mode * * Converts from kernel XSAVE or XSAVES compacted format to UABI conforming @@ -951,11 +952,10 @@ static void copy_feature(bool from_xstate, struct membuf *to, void *xstate, * * It supports partial copy but @to.pos always starts from zero. */ -void copy_xstate_to_uabi_buf(struct membuf to, struct task_struct *tsk, - enum xstate_copy_mode copy_mode) +void __copy_xstate_to_uabi_buf(struct membuf to, struct xregs_state *xsave, + u32 pkru_val, enum xstate_copy_mode copy_mode) { const unsigned int off_mxcsr = offsetof(struct fxregs_state, mxcsr); - struct xregs_state *xsave = &tsk->thread.fpu.state.xsave; struct xregs_state *xinit = &init_fpstate.xsave; struct xstate_header header; unsigned int zerofrom; @@ -1033,10 +1033,9 @@ void copy_xstate_to_uabi_buf(struct membuf to, struct task_struct *tsk, struct pkru_state pkru = {0}; /* * PKRU is not necessarily up to date in the - * thread's XSAVE buffer. Fill this part from the - * per-thread storage. + * XSAVE buffer. Use the provided value. */ - pkru.pkru = tsk->thread.pkru; + pkru.pkru = pkru_val; membuf_write(&to, &pkru, sizeof(pkru)); } else { copy_feature(header.xfeatures & BIT_ULL(i), &to, @@ -1056,6 +1055,25 @@ out: membuf_zero(&to, to.left); } +/** + * copy_xstate_to_uabi_buf - Copy kernel saved xstate to a UABI buffer + * @to: membuf descriptor + * @tsk: The task from which to copy the saved xstate + * @copy_mode: The requested copy mode + * + * Converts from kernel XSAVE or XSAVES compacted format to UABI conforming + * format, i.e. from the kernel internal hardware dependent storage format + * to the requested @mode. UABI XSTATE is always uncompacted! + * + * It supports partial copy but @to.pos always starts from zero. + */ +void copy_xstate_to_uabi_buf(struct membuf to, struct task_struct *tsk, + enum xstate_copy_mode copy_mode) +{ + __copy_xstate_to_uabi_buf(to, &tsk->thread.fpu.state.xsave, + tsk->thread.pkru, copy_mode); +} + static int copy_from_buffer(void *dst, unsigned int offset, unsigned int size, const void *kbuf, const void __user *ubuf) { diff --git a/arch/x86/kernel/fpu/xstate.h b/arch/x86/kernel/fpu/xstate.h index 0789a04ee705..81f4202781ac 100644 --- a/arch/x86/kernel/fpu/xstate.h +++ b/arch/x86/kernel/fpu/xstate.h @@ -15,4 +15,7 @@ static inline void xstate_init_xcomp_bv(struct xregs_state *xsave, u64 mask) xsave->header.xcomp_bv = mask | XCOMP_BV_COMPACTED_FORMAT; } +extern void __copy_xstate_to_uabi_buf(struct membuf to, struct xregs_state *xsave, + u32 pkru_val, enum xstate_copy_mode copy_mode); + #endif |