Hi Ashish,

I love your patch! Yet something to improve:

[auto build test ERROR on tip/x86/mm]
[also build test ERROR on v5.6]
[cannot apply to kvm/linux-next tip/x86/core next-20200327]
[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/Ashish-Kalra/Add-AMD-SEV-guest-live-migration-support/20200330-094122
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git aa61ee7b9ee3cb84c0d3a842b0d17937bf024c46
config: i386-allyesconfig (attached as .config)
compiler: gcc-7 (Debian 7.5.0-5) 7.5.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

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

All errors (new ones prefixed by >>):

   arch/x86/kvm/svm.c: In function 'svm_page_enc_status_hc':
>> arch/x86/kvm/svm.c:7652:2: error: 'pfn_start' undeclared (first use in this function); did you mean 'gfn_start'?
     pfn_start = gfn_to_pfn(kvm, gfn_start);
     ^~~~~~~~~
     gfn_start
   arch/x86/kvm/svm.c:7652:2: note: each undeclared identifier is reported only once for each function it appears in
>> arch/x86/kvm/svm.c:7653:2: error: 'pfn_end' undeclared (first use in this function); did you mean 'gfn_end'?
     pfn_end = gfn_to_pfn(kvm, gfn_end);
     ^~~~~~~
     gfn_end

vim +7652 arch/x86/kvm/svm.c

  7630	
  7631	static int svm_page_enc_status_hc(struct kvm *kvm, unsigned long gpa,
  7632					  unsigned long npages, unsigned long enc)
  7633	{
  7634		struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
  7635		gfn_t gfn_start, gfn_end;
  7636		int ret;
  7637	
  7638		if (!sev_guest(kvm))
  7639			return -EINVAL;
  7640	
  7641		if (!npages)
  7642			return 0;
  7643	
  7644		gfn_start = gpa_to_gfn(gpa);
  7645		gfn_end = gfn_start + npages;
  7646	
  7647		/* out of bound access error check */
  7648		if (gfn_end <= gfn_start)
  7649			return -EINVAL;
  7650	
  7651		/* lets make sure that gpa exist in our memslot */
> 7652		pfn_start = gfn_to_pfn(kvm, gfn_start);
> 7653		pfn_end = gfn_to_pfn(kvm, gfn_end);
  7654	
  7655		if (is_error_noslot_pfn(pfn_start) && !is_noslot_pfn(pfn_start)) {
  7656			/*
  7657			 * Allow guest MMIO range(s) to be added
  7658			 * to the page encryption bitmap.
  7659			 */
  7660			return -EINVAL;
  7661		}
  7662	
  7663		if (is_error_noslot_pfn(pfn_end) && !is_noslot_pfn(pfn_end)) {
  7664			/*
  7665			 * Allow guest MMIO range(s) to be added
  7666			 * to the page encryption bitmap.
  7667			 */
  7668			return -EINVAL;
  7669		}
  7670	
  7671		mutex_lock(&kvm->lock);
  7672		ret = sev_resize_page_enc_bitmap(kvm, gfn_end);
  7673		if (ret)
  7674			goto unlock;
  7675	
  7676		if (enc)
  7677			__bitmap_set(sev->page_enc_bmap, gfn_start,
  7678					gfn_end - gfn_start);
  7679		else
  7680			__bitmap_clear(sev->page_enc_bmap, gfn_start,
  7681					gfn_end - gfn_start);
  7682	
  7683	unlock:
  7684		mutex_unlock(&kvm->lock);
  7685		return ret;
  7686	}
  7687	

---
0-DAY CI Kernel Test Service, Intel Corporation
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