From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chao Gao Subject: Re: [PATCH v12 6/7] VT-d: introduce update_irte to update irte safely Date: Fri, 7 Apr 2017 15:51:31 +0800 Message-ID: <20170407075131.GA18760@skl-2s3.sh.intel.com> References: <1491438627-10456-1-git-send-email-chao.gao@intel.com> <1491438627-10456-7-git-send-email-chao.gao@intel.com> <58E7A1DB020000780014E8AF@prv-mh.provo.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Content-Disposition: inline In-Reply-To: <58E7A1DB020000780014E8AF@prv-mh.provo.novell.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Jan Beulich Cc: Kevin Tian , George Dunlap , Andrew Cooper , Dario Faggioli , xen-devel@lists.xen.org, Jun Nakajima List-Id: xen-devel@lists.xenproject.org T24gRnJpLCBBcHIgMDcsIDIwMTcgYXQgMDY6Mjc6MzlBTSAtMDYwMCwgSmFuIEJldWxpY2ggd3Jv dGU6Cj4+Pj4gT24gMDYuMDQuMTcgYXQgMDI6MzAsIDxjaGFvLmdhb0BpbnRlbC5jb20+IHdyb3Rl Ogo+PiAtLS0gYS94ZW4vZHJpdmVycy9wYXNzdGhyb3VnaC92dGQvaW50cmVtYXAuYwo+PiArKysg Yi94ZW4vZHJpdmVycy9wYXNzdGhyb3VnaC92dGQvaW50cmVtYXAuYwo+PiBAQCAtMTY5LDEwICsx NjksNTUgQEAgYm9vbF90IF9faW5pdCBpb21tdV9zdXBwb3J0c19laW0odm9pZCkKPj4gICAgICBy ZXR1cm4gMTsKPj4gIH0KPj4gIAo+PiArLyoKPj4gKyAqIEFzc3VtZSBpcmVtYXBfbG9jayBoYXMg YmVlbiBhY3F1aXJlZC4gSXQgaXMgdG8gbWFrZSBzdXJlIHNvZnR3YXJlIHdpbGwgbm90Cj4+ICsg KiBjaGFuZ2UgdGhlIHNhbWUgSVJURSBiZWhpbmQgdXMuIFdpdGggdGhpcyBhc3N1bXB0aW9uLCBp ZiBvbmx5IGhpZ2ggcXdvcmQgb3IKPj4gKyAqIGxvdyBxd29yZCBpbiBJUlRFIGlzIHRvIGJlIHVw ZGF0ZWQsIHRoaXMgZnVuY3Rpb24ncyBhdG9taWMgdmFyaWFudCBjYW4KPj4gKyAqIHByZXNlbnQg YW4gYXRvbWljIHVwZGF0ZSB0byBWVC1kIGhhcmR3YXJlIGV2ZW4gd2hlbiBjbXB4Y2hnMTZiCj4+ ICsgKiBpbnN0cnVjdGlvbiBpcyBub3Qgc3VwcG9ydGVkLgo+PiArICovCj4+ICtzdGF0aWMgdm9p ZCB1cGRhdGVfaXJ0ZShzdHJ1Y3QgaW9tbXUgKmlvbW11LCBzdHJ1Y3QgaXJlbWFwX2VudHJ5ICpl bnRyeSwKPj4gKyAgICAgICAgICAgICAgICAgICAgICAgIGNvbnN0IHN0cnVjdCBpcmVtYXBfZW50 cnkgKm5ld19pcmUsIGJvb2wgYXRvbWljKQo+PiArewo+PiArICAgIEFTU0VSVChzcGluX2lzX2xv Y2tlZCgmaW9tbXVfaXJfY3RybChpb21tdSktPmlyZW1hcF9sb2NrKSk7Cj4+ICsKPj4gKyAgICBp ZiAoIGNwdV9oYXNfY3gxNiApCj4+ICsgICAgewo+PiArICAgICAgICBfX3VpbnQxMjhfdCByZXQ7 Cj4+ICsgICAgICAgIHN0cnVjdCBpcmVtYXBfZW50cnkgb2xkX2lyZTsKPj4gKwo+PiArICAgICAg ICBvbGRfaXJlID0gKmVudHJ5Owo+PiArICAgICAgICByZXQgPSBjbXB4Y2hnMTZiKGVudHJ5LCAm b2xkX2lyZSwgbmV3X2lyZSk7Cj4+ICsKPj4gKyAgICAgICAgLyoKPj4gKyAgICAgICAgICogSW4g dGhlIGFib3ZlLCB3ZSB1c2UgY21weGNoZzE2IHRvIGF0b21pY2FsbHkgdXBkYXRlIHRoZSAxMjgt Yml0Cj4+ICsgICAgICAgICAqIElSVEUsIGFuZCB0aGUgaGFyZHdhcmUgY2Fubm90IHVwZGF0ZSB0 aGUgSVJURSBiZWhpbmQgdXMsIHNvCj4+ICsgICAgICAgICAqIHRoZSByZXR1cm4gdmFsdWUgb2Yg Y21weGNoZzE2IHNob3VsZCBiZSB0aGUgc2FtZSBhcyBvbGRfaXJlLgo+PiArICAgICAgICAgKiBU aGlzIEFTU0VSVCB2YWxpZGF0ZSBpdC4KPj4gKyAgICAgICAgICovCj4+ICsgICAgICAgIEFTU0VS VChyZXQgPT0gb2xkX2lyZS52YWwpOwo+PiArICAgIH0KPj4gKyAgICBlbHNlCj4+ICsgICAgewo+ PiArICAgICAgICAvKgo+PiArICAgICAgICAgKiBJZiB0aGUgY2FsbGVyIHJlcXVlc3RzIGEgYXRv bWljIHVwZGF0ZSBidXQgd2UgY2FuJ3QgbWVldCBpdCwgCj4+ICsgICAgICAgICAqIGEgYnVnIHdp bGwgYmUgcmFpc2VkLgo+PiArICAgICAgICAgKi8KPj4gKyAgICAgICAgaWYgKCBlbnRyeS0+bG8g PT0gbmV3X2lyZS0+bG8gKQo+PiArICAgICAgICAgICAgd3JpdGVfYXRvbWljKCZlbnRyeS0+aGks IG5ld19pcmUtPmhpKTsKPj4gKyAgICAgICAgZWxzZSBpZiAoIGVudHJ5LT5oaSA9PSBuZXdfaXJl LT5oaSApCj4+ICsgICAgICAgICAgICB3cml0ZV9hdG9taWMoJmVudHJ5LT5sbywgbmV3X2lyZS0+ bG8pOwo+PiArICAgICAgICBlbHNlIGlmICggIWF0b21pYyApCj4+ICsgICAgICAgICAgICAqZW50 cnkgPSAqbmV3X2lyZTsKPj4gKyAgICAgICAgZWxzZQo+PiArICAgICAgICAgICAgQlVHKCk7Cj4+ ICsgICAgfQo+Cj5TYWRseSB0aGUgY29tbWVudCBzdGlsbCB1c2VzIHRoZSB3b3JkIGF0b21pYywg YW5kIHRoZXJlJ3Mgc3RpbGwgbm8KPm1lbnRpb24gb2Ygd2hldGhlciAoYW5kIGlmIHNvLCBob3cp IHRoZSBoYXJkd2FyZSBtYXkgdXBkYXRlIGFuCj5JUlRFIGJlaGluZCB5b3VyIGJhY2suIEJ1dCBz aW5jZSBLZXZpbiBnYXZlIGhpcyBSLWIsIEkgZ3Vlc3MgSSdsbAo+aGF2ZSB0byBnaXZlIHVwIG9u IHRoaXMuCgpUbyBtYWtlIGl0IGNsZWFyZXIsIHRoZSBjb21tZW50IHlvdSBtZW50aW9uZWQgaXMg dGhlIGNvbW1lbnQgaW4gdGhlIGVsc2UoKQpicmFuY2ggb3IgdGhlIGNvbW1lbnQgYmVmb3JlIHRo aXMgZnVuY3Rpb24gKG9yIGJvdGgpPyAgSSB3aWxsIGZpeCBpdAppbiBhIG5ldyBwYXRjaC4KCj4K Pj4gQEAgLTYzOSw3ICs2ODksMTAgQEAgc3RhdGljIGludCBtc2lfbXNnX3RvX3JlbWFwX2VudHJ5 KAo+PiAgICAgIHJlbWFwX3J0ZS0+YWRkcmVzc19oaSA9IDA7Cj4+ICAgICAgcmVtYXBfcnRlLT5k YXRhID0gaW5kZXggLSBpOwo+PiAgCj4+IC0gICAgKmlyZW1hcF9lbnRyeSA9IG5ld19pcmU7Cj4+ ICsgICAgdXBkYXRlX2lydGUoaW9tbXUsIGlyZW1hcF9lbnRyeSwgJm5ld19pcmUsIG1zaV9kZXNj LT5pcnRlX2luaXRpYWxpemVkKTsKPj4gKyAgICBpZiAoICFtc2lfZGVzYy0+aXJ0ZV9pbml0aWFs aXplZCApCj4+ICsgICAgICAgIG1zaV9kZXNjLT5pcnRlX2luaXRpYWxpemVkID0gdHJ1ZTsKPgo+ SSBkb24ndCBzZWUgdGhlIHBvaW50IG9mIHRoZSBjb25kaXRpb25hbCwgYW5kIEkgZ3Vlc3MgSSds bCB0YWtlIHRoZQo+bGliZXJ0eSB0byByZW1vdmUgaXQsIHNob3VsZCBJIGVuZCB1cCBjb21taXR0 aW5nIHRoaXMgcGF0Y2guCgpZZXMsIHBsZWFzZS4KClRoYW5rcwpDaGFvCgo+Cj54ODYgcGFydHMK PkFja2VkLWJ5OiBKYW4gQmV1bGljaCA8amJldWxpY2hAc3VzZS5jb20+Cj4KPkphbgo+CgpfX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpYZW4tZGV2ZWwgbWFp bGluZyBsaXN0Clhlbi1kZXZlbEBsaXN0cy54ZW4ub3JnCmh0dHBzOi8vbGlzdHMueGVuLm9yZy94 ZW4tZGV2ZWwK