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([2001:b07:6468:f312:5e2c:eb9a:a8b6:fd3e]) by smtp.gmail.com with ESMTPSA id 21sm4308042wme.6.2021.03.24.16.39.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 24 Mar 2021 16:39:03 -0700 (PDT) Subject: Re: [PATCH v3 03/25] x86/sgx: Wipe out EREMOVE from sgx_free_epc_page() To: Kai Huang Cc: Borislav Petkov , Sean Christopherson , kvm@vger.kernel.org, x86@kernel.org, linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, rick.p.edgecombe@intel.com, haitao.huang@intel.com, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com References: <20210322191540.GH6481@zn.tnic> <20210322210645.GI6481@zn.tnic> <20210323110643.f29e214ebe8ec7a4a3d0bc2e@intel.com> <20210322223726.GJ6481@zn.tnic> <20210323121643.e06403a1bc7819bab7c15d95@intel.com> <20210323160604.GB4729@zn.tnic> <20210323163258.GC4729@zn.tnic> <236c0aa9-92f2-97c8-ab11-d55b9a98c931@redhat.com> <20210325122343.008120ef70c1a1b16b5657ca@intel.com> From: Paolo Bonzini Message-ID: <8e833f7c-ea24-1044-4c69-780a84b47ce1@redhat.com> Date: Thu, 25 Mar 2021 00:39:01 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 In-Reply-To: <20210325122343.008120ef70c1a1b16b5657ca@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 25/03/21 00:23, Kai Huang wrote: > I changed to below (with slight modification on Paolo's): > > /* Error message for EREMOVE failure, when kernel is about to leak EPC page */ > #define EREMOVE_ERROR_MESSAGE \ > "EREMOVE returned %d (0x%x) and an EPC page was leaked. SGX may become unusuable. " \ > "This is likely a kernel bug. Refer to Documentation/x86/sgx.rst for more information." > > I got a checkpatch warning however: > > WARNING: It's generally not useful to have the filename in the file > #60: FILE: Documentation/x86/sgx.rst:223: > +This is likely a kernel bug. Refer to Documentation/x86/sgx.rst for more Yeah, this is more or less a false positive. Paolo