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Mon, 14 Sep 2026 17:00:50 +0000 Message-ID: Date: Mon, 14 Sep 2026 10:00:48 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/7] x86/fpu: Extract restore_from_ia32_fxstate() and clean up fpu__restore_sig() To: Andrei Vagin , Thomas Gleixner , "Ingo Molnar" , Borislav Petkov CC: , , Dave Hansen , , Alexander Mikhalitsyn , "H. Peter Anvin" References: <20260908043427.1842515-1-avagin@google.com> <20260908043427.1842515-4-avagin@google.com> Content-Language: en-US From: "Chang S. 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Previously, Note the tip- changelog style: https://docs.kernel.org/process/maintainer-tip.htm ... A good structure is to explain the context, the problem and the solution in separate paragraphs and this order. ... This first sentence doesn't appear to be the context/problem itself. > most of __fpu_restore_sig() was dedicated to handling the 32-bit compat > fpstate, while the native direct path lived in restore_fpregs_from_user(). > Having the compat handling intermixed with the main flow made it tricky > to quickly see what code was doing what. > > Extract the 32-bit legacy/compat FPU restore handling into a separate > helper function, restore_from_ia32_fxstate(), and inline the remainder > of __fpu_restore_sig() directly into fpu__restore_sig(). > > The legacy 32-bit FP frame duplicates the FP state portion of the > FX/XSAVE frame. For backward compatibility, the legacy FP frame is > treated as the source of truth, and its state is folded into the > FX/XSAVE state before restoring the registers. > > Reviewed-by: Alexander Mikhalitsyn > Signed-off-by: Andrei Vagin ... > static inline unsigned int xstate_sigframe_size(struct fpstate *fpstate) > { > @@ -450,10 +449,11 @@ static inline unsigned int xstate_sigframe_size(struct fpstate *fpstate) > bool fpu__restore_sig(void __user *buf, int ia32_frame) > { > struct fpu *fpu = x86_task_fpu(current); > - void __user *buf_fx = buf; > + bool success = false, fx_only = false; > bool ia32_fxstate = false; > - bool success = false; > + void __user *buf_fx = buf; > unsigned int size; > + u64 xrestore_mask; > > if (unlikely(!buf)) { > fpu__clear_user_states(fpu); > @@ -482,10 +482,29 @@ bool fpu__restore_sig(void __user *buf, int ia32_frame) > success = !fpregs_soft_set(current, NULL, 0, > sizeof(struct user_i387_ia32_struct), > NULL, buf); > + goto out; > + } > + > + if (use_xsave()) { > + struct _fpx_sw_bytes fx_sw_user; > + > + if (!check_xstate_in_sigframe(buf_fx, &fx_sw_user)) > + goto out; > + > + fx_only = !fx_sw_user.magic1; > + xrestore_mask = fx_sw_user.xfeatures; > } else { > - success = __fpu_restore_sig(buf, buf_fx, ia32_fxstate); > + xrestore_mask = XFEATURE_MASK_FPSSE; > + } > + > + if (ia32_fxstate) { > + success = restore_from_ia32_fxstate(buf, buf_fx, > + xrestore_mask, fx_only); > + goto out; > } > > + /* Restore the FPU registers directly from user memory. */ > + success = restore_fpregs_from_user(buf_fx, xrestore_mask, fx_only); Nit: Just stylistic - maybe this could also be kept a bit simpler: if (ia32_fxstate) success = restore_from_ia32_fxstate(); else success = restore_fpregs_from_user(); Overall, I think this refactoring makes the flow easier to follow with smaller pieces: Reviewed-by: Chang S. Bae Thanks, Chang