Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Wed, 23 Sep 2020 18:17:33 +0200
From:   Borislav Petkov <bp@alien8.de>
To:     Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc:     x86@kernel.org, linux-sgx@vger.kernel.org,
        linux-kernel@vger.kernel.org, Jethro Beekman <jethro@fortanix.com>,
        akpm@linux-foundation.org, andriy.shevchenko@linux.intel.com,
        asapek@google.com, cedric.xing@intel.com, chenalexchen@google.com,
        conradparker@google.com, cyhanish@google.com,
        dave.hansen@intel.com, haitao.huang@intel.com,
        josh@joshtriplett.org, kai.huang@intel.com, kai.svahn@intel.com,
        kmoy@google.com, ludloff@google.com, luto@kernel.org,
        nhorman@redhat.com, npmccallum@redhat.com, puiterwijk@redhat.com,
        rientjes@google.com, sean.j.christopherson@intel.com,
        tglx@linutronix.de, yaozhangx@google.com
Subject: Re: [PATCH v38 17/24] x86/sgx: ptrace() support for the SGX driver
Message-ID: <20200923161733.GP28545@zn.tnic>
References: <20200915112842.897265-1-jarkko.sakkinen@linux.intel.com>
 <20200915112842.897265-18-jarkko.sakkinen@linux.intel.com>
 <20200922154424.GL22660@zn.tnic>
 <20200923132037.GA5160@linux.intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <20200923132037.GA5160@linux.intel.com>
Precedence: bulk

On Wed, Sep 23, 2020 at 04:20:49PM +0300, Jarkko Sakkinen wrote:
> Intel Sofware Guard eXtensions (SGX) allows creation of executable blobs
> called enclaves, which cannot be accessed by default when not executing
> inside the enclave. Enclaves can be entered by only using predefined memory
> addresses, which are defined the enclave is loaded.
			      ^
			      "when" or "before". I think it is before.

> However, enclaves can defined as debug enclaves during the load time. In

"However, enclaves can be defined as debug enclaves at load time."

> debug enclaves data can be read and/or written a memory word at a time by
> using by using ENCLS[EDBGRD] and ENCLS[EDBGWR] leaf instructions.

only one "by using" is enough.

> Add 'access' implementation to vm_ops with the help of these functions.

"Add an ->access virtual MM function for accessing the enclave's memory... "

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette