linux-kernel - Re: [PATCH 25/24] x86/traps: Rewrite native_load_gs

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Date:   Thu, 9 Sep 2021 16:16:50 -0700
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Lai Jiangshan <laijs@...ux.alibaba.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Jiang <dave.jiang@...el.com>,
        Ben Widawsky <ben.widawsky@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Arvind Sankar <nivedita@...m.mit.edu>
Subject: Re: [PATCH 25/24] x86/traps: Rewrite native_load_gs_index in C code

Come to think about it, I think it would be better if we were to 
incorporate the X86_BUG_NULL_SEG null segment load in into the main 
native_load_gs_index() code while we are swapgs'd anyway. This 
simplifies the code further, and should avoid calling 
native_load_gs_index() twice if this bug is enabled.

(This is the traps.c code only; removing the now unnecessary instances 
is left as an exercise for the reader...)

	-hpa

View attachment "traps.diff" of type "text/x-patch" (1271 bytes)