linux-kernel - RE: [PATCH v20 22/28] x86/traps: Attempt to fixup exceptions in vDSO before signaling

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Date:   Thu, 27 Jun 2019 20:32:58 +0000
From:   "Xing, Cedric" <cedric.xing@...el.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
        "Christopherson, Sean J" <sean.j.christopherson@...el.com>
CC:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "npmccallum@...hat.com" <npmccallum@...hat.com>,
        "Ayoun, Serge" <serge.ayoun@...el.com>,
        "Katz-zamir, Shay" <shay.katz-zamir@...el.com>,
        "Huang, Haitao" <haitao.huang@...el.com>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "Svahn, Kai" <kai.svahn@...el.com>, "bp@...en8.de" <bp@...en8.de>,
        "josh@...htriplett.org" <josh@...htriplett.org>,
        "luto@...nel.org" <luto@...nel.org>,
        "Huang, Kai" <kai.huang@...el.com>,
        "rientjes@...gle.com" <rientjes@...gle.com>,
        Andy Lutomirski <luto@...capital.net>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: RE: [PATCH v20 22/28] x86/traps: Attempt to fixup exceptions in
 vDSO before signaling

> From: linux-sgx-owner@...r.kernel.org [mailto:linux-sgx-
> owner@...r.kernel.org] On Behalf Of Jarkko Sakkinen
> Sent: Tuesday, June 25, 2019 8:44 AM
> 
> I went through the vDSO changes just to revisit couple of details that I
> had forgotten. Sean, if you don't mind I'd squash this and prepending
> patch.

Just a reminder that #DB/#BP shall be treated differently because they are used by debuggers. So instead of branching to the fixup address, the kernel shall just signal the process. 

> 
> Is there any obvious reason why #PF fixup is in its own patch and the
> rest are collected to the same patch? I would not find it confusing if
> there was one patch per exception but really don't get this division.
> 
> /Jarkko