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d="scan'208";a="472612100" Received: from allen-box.sh.intel.com (HELO [10.239.159.118]) ([10.239.159.118]) by fmsmga004.fm.intel.com with ESMTP; 17 Jun 2021 18:47:51 -0700 Subject: Re: [PATCH v13 4/6] iommu/vt-d: Add support for IOMMU default DMA mode build options To: John Garry , joro@8bytes.org, will@kernel.org, dwmw2@infradead.org, robin.murphy@arm.com, corbet@lwn.net References: <1623841437-211832-1-git-send-email-john.garry@huawei.com> <1623841437-211832-5-git-send-email-john.garry@huawei.com> <46dbce5c-1c2b-60d4-df56-d2b95a959425@linux.intel.com> From: Lu Baolu Message-ID: Date: Fri, 18 Jun 2021 09:46:24 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US Cc: linux-doc@vger.kernel.org, linuxarm@huawei.com, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" SGkgSm9obiwKCk9uIDYvMTcvMjEgNDowMCBQTSwgSm9obiBHYXJyeSB3cm90ZToKPiBPbiAxNy8w Ni8yMDIxIDA4OjMyLCBMdSBCYW9sdSB3cm90ZToKPj4gT24gNi8xNi8yMSA3OjAzIFBNLCBKb2hu IEdhcnJ5IHdyb3RlOgo+Pj4gQEAgLTQzODIsOSArNDM4MCw5IEBAIGludCBfX2luaXQgaW50ZWxf aW9tbXVfaW5pdCh2b2lkKQo+Pj4gwqDCoMKgwqDCoMKgwqDCoMKgwqAgKiBpcyBsaWtlbHkgdG8g YmUgbXVjaCBsb3dlciB0aGFuIHRoZSBvdmVyaGVhZCBvZiAKPj4+IHN5bmNocm9uaXppbmcKPj4+ IMKgwqDCoMKgwqDCoMKgwqDCoMKgICogdGhlIHZpcnR1YWwgYW5kIHBoeXNpY2FsIElPTU1VIHBh Z2UtdGFibGVzLgo+Pj4gwqDCoMKgwqDCoMKgwqDCoMKgwqAgKi8KPj4+IC3CoMKgwqDCoMKgwqDC oCBpZiAoIWludGVsX2lvbW11X3N0cmljdCAmJiBjYXBfY2FjaGluZ19tb2RlKGlvbW11LT5jYXAp KSB7Cj4+PiAtwqDCoMKgwqDCoMKgwqDCoMKgwqDCoCBwcl93YXJuKCJJT01NVSBiYXRjaGluZyBp cyBkaXNhYmxlZCBkdWUgdG8gCj4+PiB2aXJ0dWFsaXphdGlvbiIpOwo+Pj4gLcKgwqDCoMKgwqDC oMKgwqDCoMKgwqAgaW50ZWxfaW9tbXVfc3RyaWN0ID0gMTsKPj4+ICvCoMKgwqDCoMKgwqDCoCBp ZiAoY2FwX2NhY2hpbmdfbW9kZShpb21tdS0+Y2FwKSkgewo+Pj4gK8KgwqDCoMKgwqDCoMKgwqDC oMKgwqAgcHJfd2FybigiSU9NTVUgYmF0Y2hpbmcgZGlzYWxsb3dlZCBkdWUgdG8gCj4+PiB2aXJ0 dWFsaXphdGlvblxuIik7Cj4+PiArwqDCoMKgwqDCoMKgwqDCoMKgwqDCoCBpb21tdV9zZXRfZG1h X3N0cmljdCh0cnVlKTsKPj4KPj4gV2l0aCB0aGlzIGNoYW5nZSwgVk0gZ3Vlc3Qgd2lsbCBhbHdh eXMgc2hvdyB0aGlzIHdhcm5pbmcuCj4gCj4gV291bGQgdGhleSBoYXZlIGdvdCBpdCBiZWZvcmUg YWxzbyBub3JtYWxseT8KPiAKPiBJIG1lYW4sIGRlZmF1bHQgaXMgaW50ZWxfaW9tbXVfc3RyaWN0 PTAsIHNvIGlmIAo+IGNhcF9jYWNoaW5nX21vZGUoaW9tbXUtPmNhcCkgaXMgdHJ1ZSBhbmQgaW50 ZWxfaW9tbXVfc3RyaWN0IG5vdCBzZXQgdG8gMSAKPiBlbHNld2hlcmUgcHJldmlvdXNseSwgdGhl biB3ZSB3b3VsZCBnZXQgdGhpcyBwcmludC4KClllcy4gWW91IGFyZSByaWdodC4KCj4gCj4+IEhv dyBhYm91dAo+PiByZW1vdmluZyB0aGlzIG1lc3NhZ2U/IFVzZXJzIGNvdWxkIGdldCB0aGUgc2Ft ZSBpbmZvcm1hdGlvbiB0aHJvdWdoIHRoZQo+PiBrZXJuZWwgbWVzc2FnZSBhZGRlZCBieSAiW1BB VENIIHYxMyAyLzZdIGlvbW11OiBQcmludCBzdHJpY3Qgb3IgbGF6eQo+PiBtb2RlIGF0IGluaXQg dGltZSIuCj4gCj4gSSB0aGluayB0aGF0IHRoZSBwcmludCBmcm9tIDIvNiBzaG91bGQgb2NjdXIg YmVmb3JlIHRoaXMgcHJpbnQuCj4gCj4gUmVnYXJkbGVzcyBJIHdvdWxkIHRoaW5rIHRoYXQgeW91 IHdvdWxkIHN0aWxsIGxpa2UgdG8gYmUgbm90aWZpZWQgb2YgCj4gdGhpcyBjaGFuZ2UgaW4gcG9s aWN5LCByaWdodD8KPiAKPiBIb3dldmVyIEkgbm93IHJlYWxpemUgdGhhdCB0aGUgcHJpbnQgaXMg aW4gYSBsb29wIHBlciBpb21tdSwgc28gd2Ugd291bGQgCj4gZ2V0IGl0IHBlciBpb21tdToKPiAK PiBmb3JfZWFjaF9hY3RpdmVfaW9tbXUoaW9tbXUsIGRyaGQpIHsKPiAgwqDCoMKgwqAvKgo+ICDC oMKgwqDCoCAqIFRoZSBmbHVzaCBxdWV1ZSBpbXBsZW1lbnRhdGlvbiBkb2VzIG5vdCBwZXJmb3Jt Cj4gIMKgwqDCoMKgICogcGFnZS1zZWxlY3RpdmUgaW52YWxpZGF0aW9ucyB0aGF0IGFyZSByZXF1 aXJlZCBmb3IgZWZmaWNpZW50Cj4gIMKgwqDCoMKgICogVExCIGZsdXNoZXMgaW4gdmlydHVhbCBl bnZpcm9ubWVudHMuwqAgVGhlIGJlbmVmaXQgb2YgYmF0Y2hpbmcKPiAgwqDCoMKgwqAgKiBpcyBs aWtlbHkgdG8gYmUgbXVjaCBsb3dlciB0aGFuIHRoZSBvdmVyaGVhZCBvZiBzeW5jaHJvbml6aW5n Cj4gIMKgwqDCoMKgICogdGhlIHZpcnR1YWwgYW5kIHBoeXNpY2FsIElPTU1VIHBhZ2UtdGFibGVz Lgo+ICDCoMKgwqDCoCAqLwo+ICDCoMKgwqDCoGlmICghaW50ZWxfaW9tbXVfc3RyaWN0ICYmIGNh cF9jYWNoaW5nX21vZGUoaW9tbXUtPmNhcCkpIHsKPiAgwqDCoMKgwqDCoMKgwqAgcHJfd2Fybigi SU9NTVUgYmF0Y2hpbmcgaXMgZGlzYWJsZWQgZHVlIHRvIHZpcnR1YWxpemF0aW9uIik7Cj4gIMKg wqDCoMKgwqDCoMKgIGludGVsX2lvbW11X3N0cmljdCA9IDE7Cj4gIMKgwqDCoMKgfQo+ICDCoMKg wqDCoC4uLgo+IH0KPiAKPiBJIG5lZWQgdG8gY2hhbmdlIHRoYXQuIEhvdyBhYm91dCB0aGlzOgo+ IAo+IGJvb2wgcHJpbnRfd2FybmluZyA9IGZhbHNlOwo+IAo+IGZvcl9lYWNoX2FjdGl2ZV9pb21t dShpb21tdSwgZHJoZCkgewo+ICDCoMKgwqDCoC8qCj4gIMKgwqDCoMKgICogVGhlIGZsdXNoIHF1 ZXVlIGltcGxlbWVudGF0aW9uIGRvZXMgbm90IHBlcmZvcm0KPiAgwqDCoMKgwqAgKiBwYWdlLXNl bGVjdGl2ZSBpbnZhbGlkYXRpb25zIHRoYXQgYXJlIHJlcXVpcmVkIGZvciBlZmZpY2llbnQKPiAg wqDCoMKgwqAgKiBUTEIgZmx1c2hlcyBpbiB2aXJ0dWFsIGVudmlyb25tZW50cy7CoCBUaGUgYmVu ZWZpdCBvZiBiYXRjaGluZwo+ICDCoMKgwqDCoCAqIGlzIGxpa2VseSB0byBiZSBtdWNoIGxvd2Vy IHRoYW4gdGhlIG92ZXJoZWFkIG9mIHN5bmNocm9uaXppbmcKPiAgwqDCoMKgwqAgKiB0aGUgdmly dHVhbCBhbmQgcGh5c2ljYWwgSU9NTVUgcGFnZS10YWJsZXMuCj4gIMKgwqDCoMKgICovCj4gIMKg wqDCoMKgaWYgKCFwcmludF93YXJuaW5nICYmIGNhcF9jYWNoaW5nX21vZGUoaW9tbXUtPmNhcCkp IHsKPiAgwqDCoMKgwqDCoMKgwqAgcHJfd2FybigiSU9NTVUgYmF0Y2hpbmcgZGlzYWxsb3dlZCBk dWUgdG8gdmlydHVhbGl6YXRpb25cbiIpOwo+ICDCoMKgwqDCoMKgwqDCoCBpb21tdV9zZXRfZG1h X3N0cmljdCh0cnVlKTsKPiAgwqDCoMKgwqDCoMKgwqAgcHJpbnRfd2FybmluZyA9IHRydWU7Cj4g IMKgwqDCoMKgfQo+ICDCoMKgwqDCoC4uLgo+IH0KPiAKPiBvciB1c2UgcHJfd2Fybl9vbmNlKCku CgogRnJvbSBteSBwLm8udiwgcHJfeHh4eF9vbmNlKCkgaXMgYmV0dGVyLgoKSG93IGFib3V0IHVz aW5nIGEgcHJfaW5mb19vbmNlKCk/IEkgZG9uJ3QgdGhpbmsgaXQncyBhIHdhcm5pbmcsIGl0J3MK anVzdCBhIHBvbGljeSBjaG9pY2UgaW4gVk0gZW52aXJvbm1lbnQuCgpCZXN0IHJlZ2FyZHMsCmJh b2x1Cl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmlvbW11 IG1haWxpbmcgbGlzdAppb21tdUBsaXN0cy5saW51eC1mb3VuZGF0aW9uLm9yZwpodHRwczovL2xp c3RzLmxpbnV4Zm91bmRhdGlvbi5vcmcvbWFpbG1hbi9saXN0aW5mby9pb21tdQ==