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* [luto:x86/kvm 1/1] arch/x86/kvm/vmx/vmx.c:1176:31: error: 'struct vcpu_vmx' has no member named 'host_gs_base'; did you mean
@ 2020-12-03  0:37 kernel test robot
  0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2020-12-03  0:37 UTC (permalink / raw)
  To: kbuild-all

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/kvm
head:   17d57f185ff5b3de483594a9663f3bf96080d4ce
commit: 17d57f185ff5b3de483594a9663f3bf96080d4ce [1/1] x86/vmx: Rewrite segment switching logic
config: x86_64-rhel (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/commit/?id=17d57f185ff5b3de483594a9663f3bf96080d4ce
        git remote add luto https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git
        git fetch --no-tags luto x86/kvm
        git checkout 17d57f185ff5b3de483594a9663f3bf96080d4ce
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   arch/x86/kvm/vmx/vmx.c:1114:6: warning: no previous prototype for 'vmx_set_host_fs_gs' [-Wmissing-prototypes]
    1114 | void vmx_set_host_fs_gs(struct vmcs_host_state *host_state)
         |      ^~~~~~~~~~~~~~~~~~
   In file included from include/linux/export.h:43,
                    from include/linux/linkage.h:7,
                    from include/linux/fs.h:5,
                    from include/linux/highmem.h:5,
                    from arch/x86/kvm/vmx/vmx.c:17:
   arch/x86/kvm/vmx/vmx.c: In function 'vmx_prepare_switch_to_guest':
>> arch/x86/kvm/vmx/vmx.c:1176:31: error: 'struct vcpu_vmx' has no member named 'host_gs_base'; did you mean 'host_gs_sel'?
    1176 |  if (unlikely(gs_base != vmx->host_gs_base)) {
         |                               ^~~~~~~~~~~~
   include/linux/compiler.h:78:42: note: in definition of macro 'unlikely'
      78 | # define unlikely(x) __builtin_expect(!!(x), 0)
         |                                          ^
   arch/x86/kvm/vmx/vmx.c:1178:8: error: 'struct vcpu_vmx' has no member named 'host_gs_base'; did you mean 'host_gs_sel'?
    1178 |   vmx->host_gs_base = gs_base;
         |        ^~~~~~~~~~~~
         |        host_gs_sel
>> arch/x86/kvm/vmx/vmx.c:1182:13: error: implicit declaration of function '__rdfsbase'; did you mean 'rdfsbase'? [-Werror=implicit-function-declaration]
    1182 |   fs_base = __rdfsbase();
         |             ^~~~~~~~~~
         |             rdfsbase
>> arch/x86/kvm/vmx/vmx.c:1183:34: error: implicit declaration of function '__rdgsbase_inactive' [-Werror=implicit-function-declaration]
    1183 |   vmx->msr_host_kernel_gs_base = __rdgsbase_inactive();
         |                                  ^~~~~~~~~~~~~~~~~~~
>> arch/x86/kvm/vmx/vmx.c:1184:3: error: implicit declaration of function '__wrgsbase_inactive' [-Werror=implicit-function-declaration]
    1184 |   __wrgsbase_inactive(vmx->msr_guest_kernel_gs_base);
         |   ^~~~~~~~~~~~~~~~~~~
   arch/x86/kvm/vmx/vmx.c: In function 'vmx_prepare_switch_to_host':
   arch/x86/kvm/vmx/vmx.c:1274:26: warning: variable 'host_state' set but not used [-Wunused-but-set-variable]
    1274 |  struct vmcs_host_state *host_state;
         |                          ^~~~~~~~~~
   cc1: some warnings being treated as errors

vim +1176 arch/x86/kvm/vmx/vmx.c

  1127	
  1128		vmx->req_immediate_exit = false;
  1129	
  1130		/*
  1131		 * Note that guest MSRs to be saved/restored can also be changed
  1132		 * when guest state is loaded. This happens when guest transitions
  1133		 * to/from long-mode by setting MSR_EFER.LMA.
  1134		 */
  1135		if (!vmx->guest_msrs_ready) {
  1136			vmx->guest_msrs_ready = true;
  1137			for (i = 0; i < vmx->save_nmsrs; ++i)
  1138				kvm_set_shared_msr(vmx->guest_msrs[i].index,
  1139						   vmx->guest_msrs[i].data,
  1140						   vmx->guest_msrs[i].mask);
  1141	
  1142		}
  1143	
  1144		if (vmx->nested.need_vmcs12_to_shadow_sync)
  1145			nested_sync_vmcs12_to_shadow(vcpu);
  1146	
  1147		if (vmx->guest_state_loaded)
  1148			return;
  1149	
  1150		host_state = &vmx->loaded_vmcs->host_state;
  1151	
  1152		vmx->host_ldt_sel = kvm_read_ldt();
  1153	
  1154		/*
  1155		 * Set host fs and gs selectors.  Unfortunately, 26.2.3 does not
  1156		 * allow segment selectors with RPL > 0 or TI == 1.  Additionally,
  1157		 * VM exit cannot restore segment attributes other than the base.
  1158		 * This means that the only user selector that can be usefully
  1159		 * restored by VM exit is 0.
  1160		 *
  1161		 * Fortunately, the common case is that userspace is a normal
  1162		 * 64-bit program with all selectors except CS and SS set to 0.
  1163		 */
  1164	
  1165	#ifdef CONFIG_X86_64
  1166		/*
  1167		 * On 64-bit kernels, DS, ES, FS, and GS contain their userspace
  1168		 * values.  Save them.
  1169		 */
  1170		savesegment(ds, vmx->host_ds_sel);
  1171		savesegment(es, vmx->host_es_sel);
  1172		savesegment(fs, vmx->host_fs_sel);
  1173		savesegment(gs, vmx->host_gs_sel);
  1174	
  1175		gs_base = cpu_kernelmode_gs_base(smp_processor_id());
> 1176		if (unlikely(gs_base != vmx->host_gs_base)) {
  1177			vmcs_writel(HOST_GS_BASE, gs_base);
  1178			vmx->host_gs_base = gs_base;
  1179		}
  1180	
  1181		if (cpu_feature_enabled(X86_FEATURE_FSGSBASE)) {
> 1182			fs_base = __rdfsbase();
> 1183			vmx->msr_host_kernel_gs_base = __rdgsbase_inactive();
> 1184			__wrgsbase_inactive(vmx->msr_guest_kernel_gs_base);
  1185		} else {
  1186			fs_base = read_msr(MSR_FS_BASE);
  1187			vmx->msr_host_kernel_gs_base = read_msr(MSR_KERNEL_GS_BASE);
  1188			wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
  1189		}
  1190	#else
  1191		fs_base = segment_base(__KERNEL_PERCPU);
  1192		savesegment(gs, vmx->host_gs_sel);
  1193	#endif
  1194	
  1195		if (unlikely(fs_base != host_state->fs_base)) {
  1196			vmcs_writel(HOST_FS_BASE, fs_base);
  1197			host_state->fs_base = fs_base;
  1198		}
  1199	
  1200		vmx->guest_state_loaded = true;
  1201	}
  1202	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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2020-12-03  0:37 [luto:x86/kvm 1/1] arch/x86/kvm/vmx/vmx.c:1176:31: error: 'struct vcpu_vmx' has no member named 'host_gs_base'; did you mean kernel test robot

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