Re: [PATCH v2] KVM: x86: Don't read guest CR3 when doing async pf while the MMU is direct

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

Hi Xiaoyao,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 7d0a66e4bb9081d75c82ec4957c50034cb0ea449]

url:    https://github.com/intel-lab-lkp/linux/commits/Xiaoyao-Li/KVM-x86-Don-t-read-guest-CR3-when-doing-async-pf-while-the-MMU-is-direct/20251212-220612
base:   7d0a66e4bb9081d75c82ec4957c50034cb0ea449
patch link:    https://lore.kernel.org/r/20251212135051.2155280-1-xiaoyao.li%40intel.com
patch subject: [PATCH v2] KVM: x86: Don't read guest CR3 when doing async pf while the MMU is direct
config: i386-buildonly-randconfig-002-20251213 (https://download.01.org/0day-ci/archive/20251213/202512130717.aHH8rXSC-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251213/202512130717.aHH8rXSC-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/202512130717.aHH8rXSC-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/kvm_host.h:43,
                    from arch/x86/kvm/irq.h:15,
                    from arch/x86/kvm/mmu/mmu.c:19:
   arch/x86/kvm/mmu/mmu.c: In function 'kvm_arch_setup_async_pf':
>> include/linux/kvm_types.h:54:25: warning: conversion from 'long long unsigned int' to 'long unsigned int' changes value from '18446744073709551615' to '4294967295' [-Woverflow]
      54 | #define INVALID_GPA     (~(gpa_t)0)
         |                         ^
   arch/x86/kvm/mmu/mmu.c:4525:28: note: in expansion of macro 'INVALID_GPA'
    4525 |                 arch.cr3 = INVALID_GPA;
         |                            ^~~~~~~~~~~


vim +54 include/linux/kvm_types.h

d77a39d982431e drivers/kvm/types.h       Hollis Blanchard 2007-12-03  53  
cecafc0a830f7e include/linux/kvm_types.h Yu Zhang         2023-01-05 @54  #define INVALID_GPA	(~(gpa_t)0)
8564d6372a7d8a include/linux/kvm_types.h Steven Price     2019-10-21  55  

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