linux-kernel - Re: [PATCH v9 07/14] KVM: Don't allocate dirty bitmap if dirty ring is enabled

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Message-ID: <202005272034.3ZoOs0DE%lkp@intel.com>
Date:   Wed, 27 May 2020 20:53:12 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Peter Xu <peterx@...hat.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, Vitaly Kuznetsov <vkuznets@...hat.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        Christophe de Dinechin <dinechin@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>, peterx@...hat.com
Subject: Re: [PATCH v9 07/14] KVM: Don't allocate dirty bitmap if dirty ring
 is enabled

Hi Peter,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on vhost/linux-next]
[also build test WARNING on linus/master v5.7-rc7]
[cannot apply to kvm/linux-next tip/auto-latest linux/master next-20200526]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Peter-Xu/KVM-Dirty-ring-interface/20200524-070926
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
config: i386-randconfig-s002-20200527 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-240-gf0fe1cd9-dirty
        # save the attached .config to linux build tree
        make W=1 C=1 ARCH=i386 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

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


sparse warnings: (new ones prefixed by >>)

   arch/x86/kvm/mmu/mmu.c:693:18: sparse: sparse: cast to non-scalar
   arch/x86/kvm/mmu/mmu.c:712:18: sparse: sparse: cast to non-scalar
   arch/x86/kvm/mmu/mmu.c:731:18: sparse: sparse: cast to non-scalar
>> arch/x86/kvm/mmu/mmu.c:1280:24: sparse: sparse: Using plain integer as NULL pointer
   arch/x86/kvm/mmu/mmu.c:4687:57: sparse: sparse: cast truncates bits from constant value (ffffff33 becomes 33)
   arch/x86/kvm/mmu/mmu.c:4689:56: sparse: sparse: cast truncates bits from constant value (ffffff0f becomes f)
   arch/x86/kvm/mmu/mmu.c:4691:57: sparse: sparse: cast truncates bits from constant value (ffffff55 becomes 55)

vim +1280 arch/x86/kvm/mmu/mmu.c

  1269	
  1270	static struct kvm_memory_slot *
  1271	gfn_to_memslot_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t gfn,
  1272				    bool no_dirty_log)
  1273	{
  1274		struct kvm_memory_slot *slot;
  1275	
  1276		slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
  1277		if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
  1278			return NULL;
  1279		if (no_dirty_log && kvm_slot_dirty_track_enabled(slot))
> 1280			return false;
  1281	
  1282		return slot;
  1283	}
  1284	

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

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