Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Received-SPF: None (esa1.hc3370-68.iphmx.com: no sender
  authenticity information available from domain of
  sergey.dyasli@citrix.com) identity=pra;
  client-ip=162.221.158.21; receiver=esa1.hc3370-68.iphmx.com;
  envelope-from="sergey.dyasli@citrix.com";
  x-sender="sergey.dyasli@citrix.com";
  x-conformance=sidf_compatible
Received-SPF: Pass (esa1.hc3370-68.iphmx.com: domain of
  sergey.dyasli@citrix.com designates 162.221.158.21 as
  permitted sender) identity=mailfrom;
  client-ip=162.221.158.21; receiver=esa1.hc3370-68.iphmx.com;
  envelope-from="sergey.dyasli@citrix.com";
  x-sender="sergey.dyasli@citrix.com";
  x-conformance=sidf_compatible; x-record-type="v=spf1";
  x-record-text="v=spf1 ip4:209.167.231.154 ip4:178.63.86.133
  ip4:195.66.111.40/30 ip4:85.115.9.32/28 ip4:199.102.83.4
  ip4:192.28.146.160 ip4:192.28.146.107 ip4:216.52.6.88
  ip4:216.52.6.188 ip4:162.221.158.21 ip4:162.221.156.83
  ip4:168.245.78.127 ~all"
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  authenticity information available from domain of
  postmaster@mail.citrix.com) identity=helo;
  client-ip=162.221.158.21; receiver=esa1.hc3370-68.iphmx.com;
  envelope-from="sergey.dyasli@citrix.com";
  x-sender="postmaster@mail.citrix.com";
  x-conformance=sidf_compatible
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 xzI=
Subject: Re: [PATCH v1 2/4] x86/xen: add basic KASAN support for PV kernel
To:     Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        <xen-devel@lists.xen.org>, <kasan-dev@googlegroups.com>,
        <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>
CC:     Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Alexander Potapenko <glider@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Juergen Gross <jgross@suse.com>,
        Stefano Stabellini <sstabellini@kernel.org>,
        George Dunlap <george.dunlap@citrix.com>,
        Ross Lagerwall <ross.lagerwall@citrix.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        "sergey.dyasli@citrix.com >> Sergey Dyasli" 
        <sergey.dyasli@citrix.com>
References: <20200108152100.7630-1-sergey.dyasli@citrix.com>
 <20200108152100.7630-3-sergey.dyasli@citrix.com>
 <5214cb54-1719-f93b-130f-90c5da31e22a@oracle.com>
From:   Sergey Dyasli <sergey.dyasli@citrix.com>
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Message-ID: <76cf8b94-6f71-9f8c-0fc9-07ad4aded3be@citrix.com>
Date:   Fri, 10 Jan 2020 11:46:45 +0000
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 09/01/2020 23:27, Boris Ostrovsky wrote:
> 
> 
> On 1/8/20 10:20 AM, Sergey Dyasli wrote:
>> @@ -1943,6 +1973,15 @@ void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
>>       if (i && i < pgd_index(__START_KERNEL_map))
>>           init_top_pgt[i] = ((pgd_t *)xen_start_info->pt_base)[i];
>>   +#ifdef CONFIG_KASAN
>> +    /*
>> +     * Copy KASAN mappings
>> +     * ffffec0000000000 - fffffbffffffffff (=44 bits) kasan shadow memory (16TB)
>> +     */
>> +    for (i = 0xec0 >> 3; i < 0xfc0 >> 3; i++)
> 
> Are you referring here to  KASAN_SHADOW_START and KASAN_SHADOW_END? If so, can you use them instead?

Indeed, the following macros make the code neater:

#ifdef CONFIG_KASAN
	/* Copy KASAN mappings */
	for (i = pgd_index(KASAN_SHADOW_START);
	     i < pgd_index(KASAN_SHADOW_END);
	     i++)
		init_top_pgt[i] = ((pgd_t *)xen_start_info->pt_base)[i];
#endif /* ifdef CONFIG_KASAN */

--
Thanks,
Sergey