Re: [PATCH v3 7/8] KVM: x86/mmu: Protect rmaps independently with SRCU

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Hi Ben,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on kvm/queue]
[also build test ERROR on tip/master linus/master next-20210506]
[cannot apply to linux/master v5.12]
[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]

url:    https://github.com/0day-ci/linux/commits/Ben-Gardon/Lazily-allocate-memslot-rmaps/20210507-024533
base:   https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue
config: i386-randconfig-r032-20210506 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/dd56af97c1d2b22f9acd46d33c83ac5e7bf67acc
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Ben-Gardon/Lazily-allocate-memslot-rmaps/20210507-024533
        git checkout dd56af97c1d2b22f9acd46d33c83ac5e7bf67acc
        # save the attached .config to linux build tree
        make W=1 W=1 ARCH=i386 

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

All error/warnings (new ones prefixed by >>):

   In file included from arch/x86/kvm/mmu/mmu.c:1821:
   arch/x86/kvm/mmu/mmu_audit.c: In function 'inspect_spte_has_rmap':
>> arch/x86/kvm/mmu/mmu_audit.c:150:28: warning: passing argument 1 of '__gfn_to_rmap' makes pointer from integer without a cast [-Wint-conversion]
     150 |  rmap_head = __gfn_to_rmap(gfn, rev_sp->role.level, slot);
         |                            ^~~
         |                            |
         |                            gfn_t {aka long long unsigned int}
   arch/x86/kvm/mmu/mmu.c:930:56: note: expected 'struct kvm *' but argument is of type 'gfn_t' {aka 'long long unsigned int'}
     930 | static struct kvm_rmap_head *__gfn_to_rmap(struct kvm *kvm, gfn_t gfn,
         |                                            ~~~~~~~~~~~~^~~
   In file included from arch/x86/kvm/mmu/mmu.c:1821:
>> arch/x86/kvm/mmu/mmu_audit.c:150:53: warning: passing argument 3 of '__gfn_to_rmap' makes integer from pointer without a cast [-Wint-conversion]
     150 |  rmap_head = __gfn_to_rmap(gfn, rev_sp->role.level, slot);
         |                                                     ^~~~
         |                                                     |
         |                                                     struct kvm_memory_slot *
   arch/x86/kvm/mmu/mmu.c:931:13: note: expected 'int' but argument is of type 'struct kvm_memory_slot *'
     931 |         int level,
         |         ~~~~^~~~~
   In file included from arch/x86/kvm/mmu/mmu.c:1821:
>> arch/x86/kvm/mmu/mmu_audit.c:150:14: error: too few arguments to function '__gfn_to_rmap'
     150 |  rmap_head = __gfn_to_rmap(gfn, rev_sp->role.level, slot);
         |              ^~~~~~~~~~~~~
   arch/x86/kvm/mmu/mmu.c:930:30: note: declared here
     930 | static struct kvm_rmap_head *__gfn_to_rmap(struct kvm *kvm, gfn_t gfn,
         |                              ^~~~~~~~~~~~~
   In file included from arch/x86/kvm/mmu/mmu.c:1821:
   arch/x86/kvm/mmu/mmu_audit.c: In function 'audit_write_protection':
   arch/x86/kvm/mmu/mmu_audit.c:203:30: warning: passing argument 1 of '__gfn_to_rmap' makes pointer from integer without a cast [-Wint-conversion]
     203 |  rmap_head = __gfn_to_rmap(sp->gfn, PG_LEVEL_4K, slot);
         |                            ~~^~~~~
         |                              |
         |                              gfn_t {aka long long unsigned int}
   arch/x86/kvm/mmu/mmu.c:930:56: note: expected 'struct kvm *' but argument is of type 'gfn_t' {aka 'long long unsigned int'}
     930 | static struct kvm_rmap_head *__gfn_to_rmap(struct kvm *kvm, gfn_t gfn,
         |                                            ~~~~~~~~~~~~^~~
   In file included from arch/x86/kvm/mmu/mmu.c:1821:
   arch/x86/kvm/mmu/mmu_audit.c:203:50: warning: passing argument 3 of '__gfn_to_rmap' makes integer from pointer without a cast [-Wint-conversion]
     203 |  rmap_head = __gfn_to_rmap(sp->gfn, PG_LEVEL_4K, slot);
         |                                                  ^~~~
         |                                                  |
         |                                                  struct kvm_memory_slot *
   arch/x86/kvm/mmu/mmu.c:931:13: note: expected 'int' but argument is of type 'struct kvm_memory_slot *'
     931 |         int level,
         |         ~~~~^~~~~
   In file included from arch/x86/kvm/mmu/mmu.c:1821:
   arch/x86/kvm/mmu/mmu_audit.c:203:14: error: too few arguments to function '__gfn_to_rmap'
     203 |  rmap_head = __gfn_to_rmap(sp->gfn, PG_LEVEL_4K, slot);
         |              ^~~~~~~~~~~~~
   arch/x86/kvm/mmu/mmu.c:930:30: note: declared here
     930 | static struct kvm_rmap_head *__gfn_to_rmap(struct kvm *kvm, gfn_t gfn,
         |                              ^~~~~~~~~~~~~


vim +/__gfn_to_rmap +150 arch/x86/kvm/mmu/mmu_audit.c

2f4f337248cd56 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  125  
eb2591865a234c arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  126  static void inspect_spte_has_rmap(struct kvm *kvm, u64 *sptep)
2f4f337248cd56 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  127  {
bd80158aff71a8 arch/x86/kvm/mmu_audit.c     Jan Kiszka          2011-09-12  128  	static DEFINE_RATELIMIT_STATE(ratelimit_state, 5 * HZ, 10);
018aabb56d6109 arch/x86/kvm/mmu_audit.c     Takuya Yoshikawa    2015-11-20  129  	struct kvm_rmap_head *rmap_head;
2f4f337248cd56 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  130  	struct kvm_mmu_page *rev_sp;
699023e239658e arch/x86/kvm/mmu_audit.c     Paolo Bonzini       2015-05-18  131  	struct kvm_memslots *slots;
699023e239658e arch/x86/kvm/mmu_audit.c     Paolo Bonzini       2015-05-18  132  	struct kvm_memory_slot *slot;
2f4f337248cd56 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  133  	gfn_t gfn;
2f4f337248cd56 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  134  
573546820b792e arch/x86/kvm/mmu/mmu_audit.c Sean Christopherson 2020-06-22  135  	rev_sp = sptep_to_sp(sptep);
2f4f337248cd56 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  136  	gfn = kvm_mmu_page_get_gfn(rev_sp, sptep - rev_sp->spt);
2f4f337248cd56 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  137  
699023e239658e arch/x86/kvm/mmu_audit.c     Paolo Bonzini       2015-05-18  138  	slots = kvm_memslots_for_spte_role(kvm, rev_sp->role);
699023e239658e arch/x86/kvm/mmu_audit.c     Paolo Bonzini       2015-05-18  139  	slot = __gfn_to_memslot(slots, gfn);
699023e239658e arch/x86/kvm/mmu_audit.c     Paolo Bonzini       2015-05-18  140  	if (!slot) {
bd80158aff71a8 arch/x86/kvm/mmu_audit.c     Jan Kiszka          2011-09-12  141  		if (!__ratelimit(&ratelimit_state))
2f4f337248cd56 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  142  			return;
b034cf0105235e arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-12-23  143  		audit_printk(kvm, "no memslot for gfn %llx\n", gfn);
b034cf0105235e arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-12-23  144  		audit_printk(kvm, "index %ld of sp (gfn=%llx)\n",
38904e128778c3 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-09-27  145  		       (long int)(sptep - rev_sp->spt), rev_sp->gfn);
2f4f337248cd56 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  146  		dump_stack();
2f4f337248cd56 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  147  		return;
2f4f337248cd56 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  148  	}
2f4f337248cd56 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  149  
018aabb56d6109 arch/x86/kvm/mmu_audit.c     Takuya Yoshikawa    2015-11-20 @150  	rmap_head = __gfn_to_rmap(gfn, rev_sp->role.level, slot);
018aabb56d6109 arch/x86/kvm/mmu_audit.c     Takuya Yoshikawa    2015-11-20  151  	if (!rmap_head->val) {
bd80158aff71a8 arch/x86/kvm/mmu_audit.c     Jan Kiszka          2011-09-12  152  		if (!__ratelimit(&ratelimit_state))
2f4f337248cd56 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  153  			return;
b034cf0105235e arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-12-23  154  		audit_printk(kvm, "no rmap for writable spte %llx\n",
b034cf0105235e arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-12-23  155  			     *sptep);
2f4f337248cd56 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  156  		dump_stack();
2f4f337248cd56 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  157  	}
2f4f337248cd56 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  158  }
2f4f337248cd56 arch/x86/kvm/mmu_audit.c     Xiao Guangrong      2010-08-30  159  

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

Attachment: .config.gz
Description: application/gzip


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