Re: [PATCH v4 1/4] vfio/pci: Invalidate mmaps and block the access in D3hot power state

From: kernel test robot <lkp@intel.com>
To: Abhishek Sahu <abhsahu@nvidia.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	Cornelia Huck <cohuck@redhat.com>,
	Yishai Hadas <yishaih@nvidia.com>,
	Jason Gunthorpe <jgg@nvidia.com>,
	Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>,
	Kevin Tian <kevin.tian@intel.com>,
	"Rafael J . Wysocki" <rafael@kernel.org>
Cc: kbuild-all@lists.01.org, Max Gurtovoy <mgurtovoy@nvidia.com>,
	Bjorn Helgaas <helgaas@kernel.org>,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	linux-pm@vger.kernel.org, linux-pci@vger.kernel.org,
	Abhishek Sahu <abhsahu@nvidia.com>
Subject: Re: [PATCH v4 1/4] vfio/pci: Invalidate mmaps and block the access in D3hot power state
Date: Wed, 18 May 2022 07:30:40 +0800	[thread overview]
Message-ID: <202205180721.m3Z4ar57-lkp@intel.com> (raw)
In-Reply-To: <20220517100219.15146-2-abhsahu@nvidia.com>

Hi Abhishek,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on awilliam-vfio/next]
[also build test WARNING on v5.18-rc7]
[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/intel-lab-lkp/linux/commits/Abhishek-Sahu/vfio-pci-power-management-changes/20220517-180527
base:   https://github.com/awilliam/linux-vfio.git next
config: x86_64-randconfig-s021-20220516 (https://download.01.org/0day-ci/archive/20220518/202205180721.m3Z4ar57-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.2.0-20) 11.2.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://github.com/intel-lab-lkp/linux/commit/2c439fb0dc917fb8bcf3cf432c8d73d51cfb16b0
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Abhishek-Sahu/vfio-pci-power-management-changes/20220517-180527
        git checkout 2c439fb0dc917fb8bcf3cf432c8d73d51cfb16b0
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/vfio/pci/

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

sparse warnings: (new ones prefixed by >>)
>> drivers/vfio/pci/vfio_pci_config.c:411:20: sparse: sparse: restricted pci_power_t degrades to integer
   drivers/vfio/pci/vfio_pci_config.c:411:38: sparse: sparse: restricted pci_power_t degrades to integer

vim +411 drivers/vfio/pci/vfio_pci_config.c

   397	
   398	/* Caller should hold memory_lock semaphore */
   399	bool __vfio_pci_memory_enabled(struct vfio_pci_core_device *vdev)
   400	{
   401		struct pci_dev *pdev = vdev->pdev;
   402		u16 cmd = le16_to_cpu(*(__le16 *)&vdev->vconfig[PCI_COMMAND]);
   403	
   404		/*
   405		 * Memory region cannot be accessed if device power state is D3.
   406		 *
   407		 * SR-IOV VF memory enable is handled by the MSE bit in the
   408		 * PF SR-IOV capability, there's therefore no need to trigger
   409		 * faults based on the virtual value.
   410		 */
 > 411		return pdev->current_state < PCI_D3hot &&
   412		       (pdev->no_command_memory || (cmd & PCI_COMMAND_MEMORY));
   413	}
   414	

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