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X-CSE-ConnectionGUID: w1t9/T2+QAi1F+u8r8Zsng== X-CSE-MsgGUID: tKaxy5BzQCi8vVx+0mvBWA== X-IronPort-AV: E=McAfee;i="6700,10204,11406"; a="57201286" X-IronPort-AV: E=Sophos;i="6.15,220,1739865600"; d="scan'208";a="57201286" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Apr 2025 16:24:27 -0700 X-CSE-ConnectionGUID: VVnFoNmLSI+U+iizbdNHgg== X-CSE-MsgGUID: e9noRkXTQo+bCoQEGNHJkw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,220,1739865600"; d="scan'208";a="161920270" Received: from lkp-server01.sh.intel.com (HELO 61e10e65ea0f) ([10.239.97.150]) by orviesa002.jf.intel.com with ESMTP; 17 Apr 2025 16:24:23 -0700 Received: from kbuild by 61e10e65ea0f with local (Exim 4.96) (envelope-from ) id 1u5Yaj-00029N-1p; Thu, 17 Apr 2025 23:24:21 +0000 Date: Fri, 18 Apr 2025 07:24:20 +0800 From: kernel test robot To: Dan Williams , dave.hansen@linux.intel.com Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, x86@kernel.org, Kees Cook , Ingo Molnar , Naveen N Rao , Vishal Annapurve , Kirill Shutemov , Nikolay Borisov , stable@vger.kernel.org, linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev Subject: Re: [PATCH v3 2/2] x86/devmem: Drop /dev/mem access for confidential guests Message-ID: <202504180754.vQCz7zWh-lkp@intel.com> References: <174491712829.1395340.5054725417641299524.stgit@dwillia2-xfh.jf.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <174491712829.1395340.5054725417641299524.stgit@dwillia2-xfh.jf.intel.com> Hi Dan, kernel test robot noticed the following build errors: [auto build test ERROR on 0af2f6be1b4281385b618cb86ad946eded089ac8] url: https://github.com/intel-lab-lkp/linux/commits/Dan-Williams/x86-devmem-Remove-duplicate-range_is_allowed-definition/20250418-031657 base: 0af2f6be1b4281385b618cb86ad946eded089ac8 patch link: https://lore.kernel.org/r/174491712829.1395340.5054725417641299524.stgit%40dwillia2-xfh.jf.intel.com patch subject: [PATCH v3 2/2] x86/devmem: Drop /dev/mem access for confidential guests config: arm-randconfig-004-20250418 (https://download.01.org/0day-ci/archive/20250418/202504180754.vQCz7zWh-lkp@intel.com/config) compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project f819f46284f2a79790038e1f6649172789734ae8) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250418/202504180754.vQCz7zWh-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202504180754.vQCz7zWh-lkp@intel.com/ All errors (new ones prefixed by >>): >> drivers/char/mem.c:604:6: error: call to undeclared function 'cc_platform_has'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 604 | cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) | ^ >> drivers/char/mem.c:604:22: error: use of undeclared identifier 'CC_ATTR_GUEST_MEM_ENCRYPT' 604 | cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) | ^ 2 errors generated. vim +/cc_platform_has +604 drivers/char/mem.c 586 587 static int open_port(struct inode *inode, struct file *filp) 588 { 589 int rc; 590 591 if (!capable(CAP_SYS_RAWIO)) 592 return -EPERM; 593 594 rc = security_locked_down(LOCKDOWN_DEV_MEM); 595 if (rc) 596 return rc; 597 598 /* 599 * Enforce encrypted mapping consistency and avoid unaccepted 600 * memory conflicts, "lockdown" /dev/mem for confidential 601 * guests. 602 */ 603 if (IS_ENABLED(CONFIG_STRICT_DEVMEM) && > 604 cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) 605 return -EPERM; 606 607 if (iminor(inode) != DEVMEM_MINOR) 608 return 0; 609 610 /* 611 * Use a unified address space to have a single point to manage 612 * revocations when drivers want to take over a /dev/mem mapped 613 * range. 614 */ 615 filp->f_mapping = iomem_get_mapping(); 616 617 return 0; 618 } 619 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki