Re: [RFCv2 04/16] x86/kvm: Use bounce buffers for KVM memory protection

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

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Hi "Kirill,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on tip/x86/core]
[also build test WARNING on kvm/linux-next hnaz-linux-mm/master v5.9]
[cannot apply to next-20201016]
[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/Kirill-A-Shutemov/KVM-protected-memory-extension/20201020-142130
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 238c91115cd05c71447ea071624a4c9fe661f970
config: x86_64-alldefconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/0bdb6c3e82c3106d720106932629f0e3a121fb76
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Kirill-A-Shutemov/KVM-protected-memory-extension/20201020-142130
        git checkout 0bdb6c3e82c3106d720106932629f0e3a121fb76
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

   arch/x86/mm/mem_encrypt_common.c:16:6: warning: no previous prototype for 'force_dma_unencrypted' [-Wmissing-prototypes]
      16 | bool force_dma_unencrypted(struct device *dev)
         |      ^~~~~~~~~~~~~~~~~~~~~
>> arch/x86/mm/mem_encrypt_common.c:41:13: warning: no previous prototype for 'mem_encrypt_init' [-Wmissing-prototypes]
      41 | void __init mem_encrypt_init(void)
         |             ^~~~~~~~~~~~~~~~

vim +/mem_encrypt_init +41 arch/x86/mm/mem_encrypt_common.c

    14	
    15	/* Override for DMA direct allocation check - ARCH_HAS_FORCE_DMA_UNENCRYPTED */
  > 16	bool force_dma_unencrypted(struct device *dev)
    17	{
    18		/*
    19		 * For SEV and KVM, all DMA must be to unencrypted/shared addresses.
    20		 */
    21		if (sev_active() || kvm_mem_protected())
    22			return true;
    23	
    24		/*
    25		 * For SME, all DMA must be to unencrypted addresses if the
    26		 * device does not support DMA to addresses that include the
    27		 * encryption mask.
    28		 */
    29		if (sme_active()) {
    30			u64 dma_enc_mask = DMA_BIT_MASK(__ffs64(sme_me_mask));
    31			u64 dma_dev_mask = min_not_zero(dev->coherent_dma_mask,
    32							dev->bus_dma_limit);
    33	
    34			if (dma_dev_mask <= dma_enc_mask)
    35				return true;
    36		}
    37	
    38		return false;
    39	}
    40	
  > 41	void __init mem_encrypt_init(void)

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

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