arch/x86/kernel/cpu/sgx/virt.c:59:13: sparse: sparse: incorrect type in assignment (different base types)

[kernel test robot <lkp@intel.com>]

Hi Steven,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   715ca9dd687f89ddaac8ec8ccb3b5e5a30311a99
commit: 59cbd4eea48fdbc68fc17a29ad71188fea74b28b KVM: Remove HIGH_RES_TIMERS dependency
date:   6 weeks ago
config: x86_64-randconfig-123-20241020 (https://download.01.org/0day-ci/archive/20241020/202410201716.n8f4T911-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241020/202410201716.n8f4T911-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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410201716.n8f4T911-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> arch/x86/kernel/cpu/sgx/virt.c:59:13: sparse: sparse: incorrect type in assignment (different base types) @@     expected int [assigned] ret @@     got restricted vm_fault_t @@
   arch/x86/kernel/cpu/sgx/virt.c:59:13: sparse:     expected int [assigned] ret
   arch/x86/kernel/cpu/sgx/virt.c:59:13: sparse:     got restricted vm_fault_t
>> arch/x86/kernel/cpu/sgx/virt.c:60:20: sparse: sparse: restricted vm_fault_t degrades to integer
>> arch/x86/kernel/cpu/sgx/virt.c:354:36: sparse: sparse: cast removes address space '__user' of expression
   arch/x86/kernel/cpu/sgx/virt.c:385:24: sparse: sparse: cast removes address space '__user' of expression
   arch/x86/kernel/cpu/sgx/virt.c:385:43: sparse: sparse: cast removes address space '__user' of expression
   arch/x86/kernel/cpu/sgx/virt.c:385:58: sparse: sparse: cast removes address space '__user' of expression
   arch/x86/kernel/cpu/sgx/virt.c: note: in included file (through include/linux/miscdevice.h):
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true

vim +59 arch/x86/kernel/cpu/sgx/virt.c

540745ddbc70ea Sean Christopherson 2021-03-19  32  
540745ddbc70ea Sean Christopherson 2021-03-19  33  static int __sgx_vepc_fault(struct sgx_vepc *vepc,
540745ddbc70ea Sean Christopherson 2021-03-19  34  			    struct vm_area_struct *vma, unsigned long addr)
540745ddbc70ea Sean Christopherson 2021-03-19  35  {
540745ddbc70ea Sean Christopherson 2021-03-19  36  	struct sgx_epc_page *epc_page;
540745ddbc70ea Sean Christopherson 2021-03-19  37  	unsigned long index, pfn;
540745ddbc70ea Sean Christopherson 2021-03-19  38  	int ret;
540745ddbc70ea Sean Christopherson 2021-03-19  39  
540745ddbc70ea Sean Christopherson 2021-03-19  40  	WARN_ON(!mutex_is_locked(&vepc->lock));
540745ddbc70ea Sean Christopherson 2021-03-19  41  
540745ddbc70ea Sean Christopherson 2021-03-19  42  	/* Calculate index of EPC page in virtual EPC's page_array */
540745ddbc70ea Sean Christopherson 2021-03-19  43  	index = vma->vm_pgoff + PFN_DOWN(addr - vma->vm_start);
540745ddbc70ea Sean Christopherson 2021-03-19  44  
540745ddbc70ea Sean Christopherson 2021-03-19  45  	epc_page = xa_load(&vepc->page_array, index);
540745ddbc70ea Sean Christopherson 2021-03-19  46  	if (epc_page)
540745ddbc70ea Sean Christopherson 2021-03-19  47  		return 0;
540745ddbc70ea Sean Christopherson 2021-03-19  48  
540745ddbc70ea Sean Christopherson 2021-03-19  49  	epc_page = sgx_alloc_epc_page(vepc, false);
540745ddbc70ea Sean Christopherson 2021-03-19  50  	if (IS_ERR(epc_page))
540745ddbc70ea Sean Christopherson 2021-03-19  51  		return PTR_ERR(epc_page);
540745ddbc70ea Sean Christopherson 2021-03-19  52  
540745ddbc70ea Sean Christopherson 2021-03-19  53  	ret = xa_err(xa_store(&vepc->page_array, index, epc_page, GFP_KERNEL));
540745ddbc70ea Sean Christopherson 2021-03-19  54  	if (ret)
540745ddbc70ea Sean Christopherson 2021-03-19  55  		goto err_free;
540745ddbc70ea Sean Christopherson 2021-03-19  56  
540745ddbc70ea Sean Christopherson 2021-03-19  57  	pfn = PFN_DOWN(sgx_get_epc_phys_addr(epc_page));
540745ddbc70ea Sean Christopherson 2021-03-19  58  
540745ddbc70ea Sean Christopherson 2021-03-19 @59  	ret = vmf_insert_pfn(vma, addr, pfn);
540745ddbc70ea Sean Christopherson 2021-03-19 @60  	if (ret != VM_FAULT_NOPAGE) {
540745ddbc70ea Sean Christopherson 2021-03-19  61  		ret = -EFAULT;
540745ddbc70ea Sean Christopherson 2021-03-19  62  		goto err_delete;
540745ddbc70ea Sean Christopherson 2021-03-19  63  	}
540745ddbc70ea Sean Christopherson 2021-03-19  64  
540745ddbc70ea Sean Christopherson 2021-03-19  65  	return 0;
540745ddbc70ea Sean Christopherson 2021-03-19  66  
540745ddbc70ea Sean Christopherson 2021-03-19  67  err_delete:
540745ddbc70ea Sean Christopherson 2021-03-19  68  	xa_erase(&vepc->page_array, index);
540745ddbc70ea Sean Christopherson 2021-03-19  69  err_free:
540745ddbc70ea Sean Christopherson 2021-03-19  70  	sgx_free_epc_page(epc_page);
540745ddbc70ea Sean Christopherson 2021-03-19  71  	return ret;
540745ddbc70ea Sean Christopherson 2021-03-19  72  }
540745ddbc70ea Sean Christopherson 2021-03-19  73  

:::::: The code at line 59 was first introduced by commit
:::::: 540745ddbc70eabdc7dbd3fcc00fe4fb17cd59ba x86/sgx: Introduce virtual EPC for use by KVM guests

:::::: TO: Sean Christopherson <sean.j.christopherson@intel.com>
:::::: CC: Borislav Petkov <bp@suse.de>

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https://github.com/intel/lkp-tests/wiki