Re: [PATCH v1 4/8] vfio: Check nesting iommu uAPI version

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

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Hi Yi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on vfio/next]
[also build test ERROR on v5.6-rc6 next-20200320]
[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/Liu-Yi-L/vfio-expose-virtual-Shared-Virtual-Addressing-to-VMs/20200322-213259
base:   https://github.com/awilliam/linux-vfio.git next
config: arm64-defconfig (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=9.2.0 make.cross ARCH=arm64 

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

All errors (new ones prefixed by >>):

   drivers/vfio/vfio_iommu_type1.c: In function 'vfio_iommu_type1_ioctl':
>> drivers/vfio/vfio_iommu_type1.c:2299:11: error: implicit declaration of function 'iommu_get_uapi_version' [-Werror=implicit-function-declaration]
    2299 |    return iommu_get_uapi_version();
         |           ^~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/iommu_get_uapi_version +2299 drivers/vfio/vfio_iommu_type1.c

  2281	
  2282	static long vfio_iommu_type1_ioctl(void *iommu_data,
  2283					   unsigned int cmd, unsigned long arg)
  2284	{
  2285		struct vfio_iommu *iommu = iommu_data;
  2286		unsigned long minsz;
  2287	
  2288		if (cmd == VFIO_CHECK_EXTENSION) {
  2289			switch (arg) {
  2290			case VFIO_TYPE1_IOMMU:
  2291			case VFIO_TYPE1v2_IOMMU:
  2292			case VFIO_TYPE1_NESTING_IOMMU:
  2293				return 1;
  2294			case VFIO_DMA_CC_IOMMU:
  2295				if (!iommu)
  2296					return 0;
  2297				return vfio_domains_have_iommu_cache(iommu);
  2298			case VFIO_NESTING_IOMMU_UAPI:
> 2299				return iommu_get_uapi_version();
  2300			default:
  2301				return 0;
  2302			}
  2303		} else if (cmd == VFIO_IOMMU_GET_INFO) {
  2304			struct vfio_iommu_type1_info info;
  2305			struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
  2306			unsigned long capsz;
  2307			int ret;
  2308	
  2309			minsz = offsetofend(struct vfio_iommu_type1_info, iova_pgsizes);
  2310	
  2311			/* For backward compatibility, cannot require this */
  2312			capsz = offsetofend(struct vfio_iommu_type1_info, cap_offset);
  2313	
  2314			if (copy_from_user(&info, (void __user *)arg, minsz))
  2315				return -EFAULT;
  2316	
  2317			if (info.argsz < minsz)
  2318				return -EINVAL;
  2319	
  2320			if (info.argsz >= capsz) {
  2321				minsz = capsz;
  2322				info.cap_offset = 0; /* output, no-recopy necessary */
  2323			}
  2324	
  2325			info.flags = VFIO_IOMMU_INFO_PGSIZES;
  2326	
  2327			info.iova_pgsizes = vfio_pgsize_bitmap(iommu);
  2328	
  2329			ret = vfio_iommu_iova_build_caps(iommu, &caps);
  2330			if (ret)
  2331				return ret;
  2332	
  2333			ret = vfio_iommu_info_add_nesting_cap(iommu, &caps);
  2334			if (ret)
  2335				return ret;
  2336	
  2337			if (caps.size) {
  2338				info.flags |= VFIO_IOMMU_INFO_CAPS;
  2339	
  2340				if (info.argsz < sizeof(info) + caps.size) {
  2341					info.argsz = sizeof(info) + caps.size;
  2342				} else {
  2343					vfio_info_cap_shift(&caps, sizeof(info));
  2344					if (copy_to_user((void __user *)arg +
  2345							sizeof(info), caps.buf,
  2346							caps.size)) {
  2347						kfree(caps.buf);
  2348						return -EFAULT;
  2349					}
  2350					info.cap_offset = sizeof(info);
  2351				}
  2352	
  2353				kfree(caps.buf);
  2354			}
  2355	
  2356			return copy_to_user((void __user *)arg, &info, minsz) ?
  2357				-EFAULT : 0;
  2358	
  2359		} else if (cmd == VFIO_IOMMU_MAP_DMA) {
  2360			struct vfio_iommu_type1_dma_map map;
  2361			uint32_t mask = VFIO_DMA_MAP_FLAG_READ |
  2362					VFIO_DMA_MAP_FLAG_WRITE;
  2363	
  2364			minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);
  2365	
  2366			if (copy_from_user(&map, (void __user *)arg, minsz))
  2367				return -EFAULT;
  2368	
  2369			if (map.argsz < minsz || map.flags & ~mask)
  2370				return -EINVAL;
  2371	
  2372			return vfio_dma_do_map(iommu, &map);
  2373	
  2374		} else if (cmd == VFIO_IOMMU_UNMAP_DMA) {
  2375			struct vfio_iommu_type1_dma_unmap unmap;
  2376			long ret;
  2377	
  2378			minsz = offsetofend(struct vfio_iommu_type1_dma_unmap, size);
  2379	
  2380			if (copy_from_user(&unmap, (void __user *)arg, minsz))
  2381				return -EFAULT;
  2382	
  2383			if (unmap.argsz < minsz || unmap.flags)
  2384				return -EINVAL;
  2385	
  2386			ret = vfio_dma_do_unmap(iommu, &unmap);
  2387			if (ret)
  2388				return ret;
  2389	
  2390			return copy_to_user((void __user *)arg, &unmap, minsz) ?
  2391				-EFAULT : 0;
  2392	
  2393		} else if (cmd == VFIO_IOMMU_PASID_REQUEST) {
  2394			struct vfio_iommu_type1_pasid_request req;
  2395			unsigned long offset;
  2396	
  2397			minsz = offsetofend(struct vfio_iommu_type1_pasid_request,
  2398					    flags);
  2399	
  2400			if (copy_from_user(&req, (void __user *)arg, minsz))
  2401				return -EFAULT;
  2402	
  2403			if (req.argsz < minsz ||
  2404			    !vfio_iommu_type1_pasid_req_valid(req.flags))
  2405				return -EINVAL;
  2406	
  2407			if (copy_from_user((void *)&req + minsz,
  2408					   (void __user *)arg + minsz,
  2409					   sizeof(req) - minsz))
  2410				return -EFAULT;
  2411	
  2412			switch (req.flags & VFIO_PASID_REQUEST_MASK) {
  2413			case VFIO_IOMMU_PASID_ALLOC:
  2414			{
  2415				int ret = 0, result;
  2416	
  2417				result = vfio_iommu_type1_pasid_alloc(iommu,
  2418								req.alloc_pasid.min,
  2419								req.alloc_pasid.max);
  2420				if (result > 0) {
  2421					offset = offsetof(
  2422						struct vfio_iommu_type1_pasid_request,
  2423						alloc_pasid.result);
  2424					ret = copy_to_user(
  2425						      (void __user *) (arg + offset),
  2426						      &result, sizeof(result));
  2427				} else {
  2428					pr_debug("%s: PASID alloc failed\n", __func__);
  2429					ret = -EFAULT;
  2430				}
  2431				return ret;
  2432			}
  2433			case VFIO_IOMMU_PASID_FREE:
  2434				return vfio_iommu_type1_pasid_free(iommu,
  2435								   req.free_pasid);
  2436			default:
  2437				return -EINVAL;
  2438			}
  2439		}
  2440	
  2441		return -ENOTTY;
  2442	}
  2443	

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

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