From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yu Zhang Subject: Re: [PATCH] x86/mm: fix a potential race condition in map_pages_to_xen(). Date: Thu, 9 Nov 2017 18:32:26 +0800 Message-ID: References: <1510241398-25793-1-git-send-email-yu.c.zhang@linux.intel.com> <5A042C7A020000780018D740@prv-mh.provo.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <5A042C7A020000780018D740@prv-mh.provo.novell.com> Content-Language: en-US List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Jan Beulich Cc: Andrew Cooper , min.he@intel.com, xen-devel@lists.xen.org, yi.z.zhang@intel.com List-Id: xen-devel@lists.xenproject.org CgpPbiAxMS85LzIwMTcgNToyMiBQTSwgSmFuIEJldWxpY2ggd3JvdGU6Cj4+Pj4gT24gMDkuMTEu MTcgYXQgMTY6MjksIDx5dS5jLnpoYW5nQGxpbnV4LmludGVsLmNvbT4gd3JvdGU6Cj4+IEluIG1h cF9wYWdlc190b194ZW4oKSwgYSBMMiBwYWdlIHRhYmxlIGVudHJ5IG1heSBiZSByZXNldCB0byBw b2ludCB0bwo+PiBhIHN1cGVycGFnZSwgYW5kIGl0cyBjb3JyZXNwb25kaW5nIEwxIHBhZ2UgdGFi bGUgbmVlZCBiZSBmcmVlZCBpbiBzdWNoCj4+IHNjZW5hcmlvLCB3aGVuIHRoZXNlIEwxIHBhZ2Ug dGFibGUgZW50cmllcyBhcmUgbWFwcGluZyB0byBjb25zZWN1dGl2ZQo+PiBwYWdlIGZyYW1lcyBh bmQgaGF2aW5nIHRoZSBzYW1lIG1hcHBpbmcgZmxhZ3MuCj4+Cj4+IEhvd2V2ZXIsIHZhcmlhYmxl IGBwbDFlYCBpcyBub3QgcHJvdGVjdGVkIGJ5IHRoZSBsb2NrIGJlZm9yZSBMMSBwYWdlIHRhYmxl Cj4+IGlzIGVudW1lcmF0ZWQuIEEgcmFjZSBjb25kaXRpb24gbWF5IGhhcHBlbiBpZiB0aGlzIGNv ZGUgcGF0aCBpcyBpbnZva2VkCj4+IHNpbXVsdGFuZW91c2x5IG9uIGRpZmZlcmVudCBDUFVzLgo+ Pgo+PiBGb3IgZXhhbXBsZSwgYHBsMWVgIHZhbHVlIG9uIENQVTAgbWF5IGhvbGQgYW4gb2Jzb2xl dGUgdmFsdWUsIHBvaW50aW5nCj4+IHRvIGEgcGFnZSB3aGljaCBoYXMganVzdCBiZWVuIGZyZWVk IG9uIENQVTEuIEJlc2lkZXMsIGJlZm9yZSB0aGlzIHBhZ2UKPj4gaXMgcmV1c2VkLCBpdCB3aWxs IHN0aWxsIGJlIGhvbGRpbmcgdGhlIG9sZCBQVEVzLCByZWZlcmVuY2luZyBjb25zZWN1dGl2ZQo+ PiBwYWdlIGZyYW1lcy4gQ29uc2VxdWVudGx5IHRoZSBgZnJlZV94ZW5fcGFnZXRhYmxlKGwyZV90 b19sMWUob2wyZSkpYCB3aWxsCj4+IGJlIHRyaWdnZXJlZCBvbiBDUFUwLCByZXN1bHRpbmcgdGhl IHVuZXhwZWN0ZWQgZnJlZSBvZiBhIG5vcm1hbCBwYWdlLgo+Pgo+PiBQcm90ZWN0aW5nIHRoZSBg cGwxZWAgd2l0aCB0aGUgbG9jayB3aWxsIGZpeCB0aGlzIHJhY2UgY29uZGl0aW9uLgo+Pgo+PiBT aWduZWQtb2ZmLWJ5OiBNaW4gSGUgPG1pbi5oZUBpbnRlbC5jb20+Cj4+IFNpZ25lZC1vZmYtYnk6 IFlpIFpoYW5nIDx5aS56LnpoYW5nQGludGVsLmNvbT4KPj4gU2lnbmVkLW9mZi1ieTogWXUgWmhh bmcgPHl1LmMuemhhbmdAbGludXguaW50ZWwuY29tPgo+IE9oLCBvbmUgbW9yZSB0aGluZzogSXMg aXQgcmVhbGx5IHRoZSBjYXNlIHRoYXQgYWxsIHRocmVlIG9mIHlvdQo+IGNvbnRyaWJ1dGVkIHRv IHRoZSBwYXRjaD8gV2UgZG9uJ3QgdXNlIHRoZSBMaW51eCBtb2RlbCBvZgo+IGV2ZXJ5b25lIHRo cm91Z2ggd2hvc2UgaGFuZHMgYSBwYXRjaCBwYXNzZXMgYWRkaW5nIGFuCj4gUy1vLWIgb2YgdGhl aXIgb3duIC0gdGhhdCB3b3VsZCByYXRoZXIgYmUgUmV2aWV3ZWQtYnkgdGhlbiAoaWYKPiBhcHBs aWNhYmxlKS4KPgo+IEFsc28gZ2VuZXJhbGx5IEkgd291bGQgY29uc2lkZXIgdGhlIGZpcnN0IFMt by1iIHRvIGJlIHRoYXQgb2YgdGhlCj4gb3JpZ2luYWwgYXV0aG9yLCB5ZXQgdGhlIGFic2VuY2Ug b2YgYW4gZXhwbGljaXQgRnJvbTogdGFnIG1ha2VzCj4gYXV0aG9yc2hpcCBhbWJpZ3VvdXMgaGVy ZS4gUGxlYXNlIGNsYXJpZnkgdGhpcyBpbiB2Mi4KCk9oLCB3ZSB0aHJlZSBmb3VuZCB0aGlzIGlz c3VlIHdoZW4gZGVidWdnaW5nIGEgYnVnIHRvZ2V0aGVyLiBBbmQgTWluIGlzCnRoZSBhdXRob3Ig b2YgdGhpcyBwYXRjaC4gU28gSSdkIGxpa2UgdG8gYWRkCgoiRnJvbTogTWluIEhlIDxtaW4uaGVA aW50ZWwuY29tPiAiCgphdCB0aGUgYmVnaW5uaW5nIG9mIHRoZSBjb21taXQgbWVzc2FnZSBpbiB2 Mi4gOi0pCgpZdQo+IEphbgo+Cj4KCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fXwpYZW4tZGV2ZWwgbWFpbGluZyBsaXN0Clhlbi1kZXZlbEBsaXN0cy54ZW4u b3JnCmh0dHBzOi8vbGlzdHMueGVuLm9yZy94ZW4tZGV2ZWwK