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Peter Anvin" , Borislav Petkov , Dave Hansen , Ingo Molnar , Paolo Bonzini , Sean Christopherson , Thomas Gleixner , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org Cc: oe-kbuild-all@lists.linux.dev, suravee.suthikulpanit@amd.com, vasant.hegde@amd.com, nikunj.dadhania@amd.com, Manali.Shukla@amd.com, Sairaj Kodilkar Subject: Re: [PATCH] KVM: x86: Add support for cmpxchg16b emulation Message-ID: <202603071055.Wi43mREW-lkp@intel.com> References: <20260306102047.29760-1-sarunkod@amd.com> Precedence: bulk X-Mailing-List: kvm@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: <20260306102047.29760-1-sarunkod@amd.com> Hi Sairaj, kernel test robot noticed the following build warnings: [auto build test WARNING on kvm/queue] [also build test WARNING on kvm/next tip/master linus/master v7.0-rc2 next-20260306] [cannot apply to kvm/linux-next tip/auto-latest] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Sairaj-Kodilkar/KVM-x86-Add-support-for-cmpxchg16b-emulation/20260306-182915 base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue patch link: https://lore.kernel.org/r/20260306102047.29760-1-sarunkod%40amd.com patch subject: [PATCH] KVM: x86: Add support for cmpxchg16b emulation config: i386-randconfig-005-20260307 (https://download.01.org/0day-ci/archive/20260307/202603071055.Wi43mREW-lkp@intel.com/config) compiler: gcc-12 (Debian 12.4.0-5) 12.4.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260307/202603071055.Wi43mREW-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/202603071055.Wi43mREW-lkp@intel.com/ All warnings (new ones prefixed by >>): In file included from arch/x86/kvm/emulate.c:24: arch/x86/kvm/kvm_emulate.h:271:17: error: unknown type name '__uint128_t' 271 | __uint128_t val128; | ^~~~~~~~~~~ arch/x86/kvm/emulate.c: In function '__handle_cmpxchg16b': arch/x86/kvm/emulate.c:2215:9: error: unknown type name '__uint128_t'; did you mean '__int128__'? 2215 | __uint128_t old128 = ctxt->dst.val128; | ^~~~~~~~~~~ | __int128__ >> arch/x86/kvm/emulate.c:2222:28: warning: right shift count >= width of type [-Wshift-count-overflow] 2222 | ((u64) (old128 >> 64) != (u64) reg_read(ctxt, VCPU_REGS_RDX))) { | ^~ arch/x86/kvm/emulate.c:2224:65: warning: right shift count >= width of type [-Wshift-count-overflow] 2224 | *reg_write(ctxt, VCPU_REGS_RDX) = (u64) (old128 >> 64); | ^~ arch/x86/kvm/emulate.c:2228:27: error: '__uint128_t' undeclared (first use in this function); did you mean '__int128__'? 2228 | ((__uint128_t) reg_read(ctxt, VCPU_REGS_RCX) << 64) | | ^~~~~~~~~~~ | __int128__ arch/x86/kvm/emulate.c:2228:27: note: each undeclared identifier is reported only once for each function it appears in arch/x86/kvm/emulate.c:2228:39: error: expected ')' before 'reg_read' 2228 | ((__uint128_t) reg_read(ctxt, VCPU_REGS_RCX) << 64) | | ~ ^~~~~~~~~ | ) vim +2222 arch/x86/kvm/emulate.c 2212 2213 static int __handle_cmpxchg16b(struct x86_emulate_ctxt *ctxt) 2214 { 2215 __uint128_t old128 = ctxt->dst.val128; 2216 2217 /* Use of the REX.W prefix promotes operation to 128 bits */ 2218 if (!(ctxt->rex_bits & REX_W)) 2219 return X86EMUL_UNHANDLEABLE; 2220 2221 if (((u64) (old128 >> 0) != (u64) reg_read(ctxt, VCPU_REGS_RAX)) || > 2222 ((u64) (old128 >> 64) != (u64) reg_read(ctxt, VCPU_REGS_RDX))) { 2223 *reg_write(ctxt, VCPU_REGS_RAX) = (u64) (old128 >> 0); 2224 *reg_write(ctxt, VCPU_REGS_RDX) = (u64) (old128 >> 64); 2225 ctxt->eflags &= ~X86_EFLAGS_ZF; 2226 } else { 2227 ctxt->dst.val128 = 2228 ((__uint128_t) reg_read(ctxt, VCPU_REGS_RCX) << 64) | 2229 (u64) reg_read(ctxt, VCPU_REGS_RBX); 2230 2231 ctxt->eflags |= X86_EFLAGS_ZF; 2232 } 2233 return X86EMUL_CONTINUE; 2234 } 2235 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki