linux-kernel - arch/riscv/kvm/vcpu_sbi_sta.c:59:13: sparse: sparse: restricted _

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Date: Sun, 23 Jun 2024 10:01:27 +0800
From: kernel test robot <lkp@...el.com>
To: Andrew Jones <ajones@...tanamicro.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Anup Patel <anup@...infault.org>, Atish Patra <atishp@...osinc.com>
Subject: arch/riscv/kvm/vcpu_sbi_sta.c:59:13: sparse: sparse: restricted
 __le32 degrades to integer

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5f583a3162ffd9f7999af76b8ab634ce2dac9f90
commit: f072b272aa27d57cf7fe6fdedb30fb50f391974e RISC-V: KVM: Use correct restricted types
date:   5 months ago
config: riscv-randconfig-r113-20240623 (https://download.01.org/0day-ci/archive/20240623/202406230951.z2XjxdWg-lkp@intel.com/config)
compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a)
reproduce: (https://download.01.org/0day-ci/archive/20240623/202406230951.z2XjxdWg-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202406230951.z2XjxdWg-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> arch/riscv/kvm/vcpu_sbi_sta.c:59:13: sparse: sparse: restricted __le32 degrades to integer
>> arch/riscv/kvm/vcpu_sbi_sta.c:59:13: sparse: sparse: restricted __le32 degrades to integer
   arch/riscv/kvm/vcpu_sbi_sta.c:59:13: sparse: sparse: cast to restricted __le32
   arch/riscv/kvm/vcpu_sbi_sta.c:65:13: sparse: sparse: restricted __le32 degrades to integer
   arch/riscv/kvm/vcpu_sbi_sta.c:65:13: sparse: sparse: restricted __le32 degrades to integer
>> arch/riscv/kvm/vcpu_sbi_sta.c:65:13: sparse: sparse: cast from restricted __le32
>> arch/riscv/kvm/vcpu_sbi_sta.c:68:14: sparse: sparse: restricted __le64 degrades to integer
>> arch/riscv/kvm/vcpu_sbi_sta.c:68:14: sparse: sparse: restricted __le64 degrades to integer
   arch/riscv/kvm/vcpu_sbi_sta.c:68:14: sparse: sparse: cast to restricted __le64
   arch/riscv/kvm/vcpu_sbi_sta.c:72:17: sparse: sparse: restricted __le64 degrades to integer
   arch/riscv/kvm/vcpu_sbi_sta.c:72:17: sparse: sparse: restricted __le64 degrades to integer
>> arch/riscv/kvm/vcpu_sbi_sta.c:72:17: sparse: sparse: cast from restricted __le64
   arch/riscv/kvm/vcpu_sbi_sta.c:76:9: sparse: sparse: restricted __le32 degrades to integer
   arch/riscv/kvm/vcpu_sbi_sta.c:76:9: sparse: sparse: restricted __le32 degrades to integer
   arch/riscv/kvm/vcpu_sbi_sta.c:76:9: sparse: sparse: cast from restricted __le32

vim +59 arch/riscv/kvm/vcpu_sbi_sta.c

    24	
    25	void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu)
    26	{
    27		gpa_t shmem = vcpu->arch.sta.shmem;
    28		u64 last_steal = vcpu->arch.sta.last_steal;
    29		__le32 __user *sequence_ptr;
    30		__le64 __user *steal_ptr;
    31		__le32 sequence_le;
    32		__le64 steal_le;
    33		u32 sequence;
    34		u64 steal;
    35		unsigned long hva;
    36		gfn_t gfn;
    37	
    38		if (shmem == INVALID_GPA)
    39			return;
    40	
    41		/*
    42		 * shmem is 64-byte aligned (see the enforcement in
    43		 * kvm_sbi_sta_steal_time_set_shmem()) and the size of sbi_sta_struct
    44		 * is 64 bytes, so we know all its offsets are in the same page.
    45		 */
    46		gfn = shmem >> PAGE_SHIFT;
    47		hva = kvm_vcpu_gfn_to_hva(vcpu, gfn);
    48	
    49		if (WARN_ON(kvm_is_error_hva(hva))) {
    50			vcpu->arch.sta.shmem = INVALID_GPA;
    51			return;
    52		}
    53	
    54		sequence_ptr = (__le32 __user *)(hva + offset_in_page(shmem) +
    55				       offsetof(struct sbi_sta_struct, sequence));
    56		steal_ptr = (__le64 __user *)(hva + offset_in_page(shmem) +
    57				    offsetof(struct sbi_sta_struct, steal));
    58	
  > 59		if (WARN_ON(get_user(sequence_le, sequence_ptr)))
    60			return;
    61	
    62		sequence = le32_to_cpu(sequence_le);
    63		sequence += 1;
    64	
  > 65		if (WARN_ON(put_user(cpu_to_le32(sequence), sequence_ptr)))
    66			return;
    67	
  > 68		if (!WARN_ON(get_user(steal_le, steal_ptr))) {
    69			steal = le64_to_cpu(steal_le);
    70			vcpu->arch.sta.last_steal = READ_ONCE(current->sched_info.run_delay);
    71			steal += vcpu->arch.sta.last_steal - last_steal;
  > 72			WARN_ON(put_user(cpu_to_le64(steal), steal_ptr));
    73		}
    74	
    75		sequence += 1;
    76		WARN_ON(put_user(cpu_to_le32(sequence), sequence_ptr));
    77	
    78		kvm_vcpu_mark_page_dirty(vcpu, gfn);
    79	}
    80	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki