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bh=gqqfJQKIdte55u7kG25HpIFh+raZcUjLo8p4M5prlro=; b=QxMSTgxRhWqUIInRgytFve11ls1/ZxEqoYZfFBBGPyB4azgzjNVUW1Xu29F9ukvvi/LM5e EQmqIDQwn+EWyNy6gGg76qBMi9KtmEhc7uMjJwF+zVQn/vVlip+Ov0sl+AqfRm+r8SxdYa 40/LxWim+LKOkUsYT455UkJ9PRpDvQM= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-248-3pXw21HFO6KHRixokR3V1g-1; Wed, 07 Apr 2021 23:26:10 -0400 X-MC-Unique: 3pXw21HFO6KHRixokR3V1g-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E777B1006C83; Thu, 8 Apr 2021 03:26:07 +0000 (UTC) Received: from wangxiaodeMacBook-Air.local (ovpn-12-194.pek2.redhat.com [10.72.12.194]) by smtp.corp.redhat.com (Postfix) with ESMTP id 60B555CC3E; Thu, 8 Apr 2021 03:25:51 +0000 (UTC) Subject: Re: [PATCH v6 08/10] vduse: Implement an MMU-based IOMMU driver To: Xie Yongji , mst@redhat.com, stefanha@redhat.com, sgarzare@redhat.com, parav@nvidia.com, hch@infradead.org, christian.brauner@canonical.com, rdunlap@infradead.org, willy@infradead.org, viro@zeniv.linux.org.uk, axboe@kernel.dk, bcrl@kvack.org, corbet@lwn.net, mika.penttila@nextfour.com, dan.carpenter@oracle.com References: <20210331080519.172-1-xieyongji@bytedance.com> <20210331080519.172-9-xieyongji@bytedance.com> From: Jason Wang Message-ID: <30862242-293b-f42f-d8ce-2c31a52e3697@redhat.com> Date: Thu, 8 Apr 2021 11:25:49 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.9.0 MIME-Version: 1.0 In-Reply-To: <20210331080519.172-9-xieyongji@bytedance.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Cc: linux-fsdevel@vger.kernel.org, netdev@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="gbk"; Format="flowed" Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" CtTaIDIwMjEvMy8zMSDPws7nNDowNSwgWGllIFlvbmdqaSDQtLXAOgo+IFRoaXMgaW1wbGVtZW50 cyBhbiBNTVUtYmFzZWQgSU9NTVUgZHJpdmVyIHRvIHN1cHBvcnQgbWFwcGluZwo+IGtlcm5lbCBk bWEgYnVmZmVyIGludG8gdXNlcnNwYWNlLiBUaGUgYmFzaWMgaWRlYSBiZWhpbmQgaXQgaXMKPiB0 cmVhdGluZyBNTVUgKFZBLT5QQSkgYXMgSU9NTVUgKElPVkEtPlBBKS4gVGhlIGRyaXZlciB3aWxs IHNldAo+IHVwIE1NVSBtYXBwaW5nIGluc3RlYWQgb2YgSU9NTVUgbWFwcGluZyBmb3IgdGhlIERN QSB0cmFuc2ZlciBzbwo+IHRoYXQgdGhlIHVzZXJzcGFjZSBwcm9jZXNzIGlzIGFibGUgdG8gdXNl IGl0cyB2aXJ0dWFsIGFkZHJlc3MgdG8KPiBhY2Nlc3MgdGhlIGRtYSBidWZmZXIgaW4ga2VybmVs Lgo+Cj4gQW5kIHRvIGF2b2lkIHNlY3VyaXR5IGlzc3VlLCBhIGJvdW5jZS1idWZmZXJpbmcgbWVj aGFuaXNtIGlzCj4gaW50cm9kdWNlZCB0byBwcmV2ZW50IHVzZXJzcGFjZSBhY2Nlc3NpbmcgdGhl IG9yaWdpbmFsIGJ1ZmZlcgo+IGRpcmVjdGx5Lgo+Cj4gU2lnbmVkLW9mZi1ieTogWGllIFlvbmdq aSA8eGlleW9uZ2ppQGJ5dGVkYW5jZS5jb20+CgoKQWNrZWQtYnk6IEphc29uIFdhbmcgPGphc293 YW5nQHJlZGhhdC5jb20+CgpXaXRoIHNvbWUgbml0czoKCgo+IC0tLQo+ICAgZHJpdmVycy92ZHBh L3ZkcGFfdXNlci9pb3ZhX2RvbWFpbi5jIHwgNTIxICsrKysrKysrKysrKysrKysrKysrKysrKysr KysrKysrKysrCj4gICBkcml2ZXJzL3ZkcGEvdmRwYV91c2VyL2lvdmFfZG9tYWluLmggfCAgNzAg KysrKysKPiAgIDIgZmlsZXMgY2hhbmdlZCwgNTkxIGluc2VydGlvbnMoKykKPiAgIGNyZWF0ZSBt b2RlIDEwMDY0NCBkcml2ZXJzL3ZkcGEvdmRwYV91c2VyL2lvdmFfZG9tYWluLmMKPiAgIGNyZWF0 ZSBtb2RlIDEwMDY0NCBkcml2ZXJzL3ZkcGEvdmRwYV91c2VyL2lvdmFfZG9tYWluLmgKCgpbLi4u XQoKCj4gK3N0YXRpYyB2b2lkIHZkdXNlX2RvbWFpbl9ib3VuY2Uoc3RydWN0IHZkdXNlX2lvdmFf ZG9tYWluICpkb21haW4sCj4gKwkJCQlkbWFfYWRkcl90IGlvdmEsIHNpemVfdCBzaXplLAo+ICsJ CQkJZW51bSBkbWFfZGF0YV9kaXJlY3Rpb24gZGlyKQo+ICt7Cj4gKwlzdHJ1Y3QgdmR1c2VfYm91 bmNlX21hcCAqbWFwOwo+ICsJdW5zaWduZWQgaW50IG9mZnNldDsKPiArCXZvaWQgKmFkZHI7Cj4g KwlzaXplX3Qgc3o7Cj4gKwo+ICsJd2hpbGUgKHNpemUpIHsKPiArCQltYXAgPSAmZG9tYWluLT5i b3VuY2VfbWFwc1tpb3ZhID4+IFBBR0VfU0hJRlRdOwo+ICsJCW9mZnNldCA9IG9mZnNldF9pbl9w YWdlKGlvdmEpOwo+ICsJCXN6ID0gbWluX3Qoc2l6ZV90LCBQQUdFX1NJWkUgLSBvZmZzZXQsIHNp emUpOwo+ICsKPiArCQlpZiAoV0FSTl9PTighbWFwLT5ib3VuY2VfcGFnZSB8fAo+ICsJCQkgICAg bWFwLT5vcmlnX3BoeXMgPT0gSU5WQUxJRF9QSFlTX0FERFIpKQo+ICsJCQlyZXR1cm47Cj4gKwo+ ICsJCWFkZHIgPSBwYWdlX2FkZHJlc3MobWFwLT5ib3VuY2VfcGFnZSkgKyBvZmZzZXQ7Cj4gKwkJ ZG9fYm91bmNlKG1hcC0+b3JpZ19waHlzICsgb2Zmc2V0LCBhZGRyLCBzeiwgZGlyKTsKPiArCQlz aXplIC09IHN6Owo+ICsJCWlvdmEgKz0gc3o7Cj4gKwl9Cj4gK30KPiArCj4gK3N0YXRpYyBzdHJ1 Y3QgcGFnZSAqCj4gK3ZkdXNlX2RvbWFpbl9nZXRfbWFwcGluZ19wYWdlKHN0cnVjdCB2ZHVzZV9p b3ZhX2RvbWFpbiAqZG9tYWluLCB1NjQgaW92YSkKCgpJdCdzIGJldHRlciB0byByZW5hbWUgdGhp cyBhcyAidmR1c2VfZG9tYWluX2dldF9jb2hlcmVudF9wYWdlPyIuCgoKPiArewo+ICsJdTY0IHN0 YXJ0ID0gaW92YSAmIFBBR0VfTUFTSzsKPiArCXU2NCBsYXN0ID0gc3RhcnQgKyBQQUdFX1NJWkUg LSAxOwo+ICsJc3RydWN0IHZob3N0X2lvdGxiX21hcCAqbWFwOwo+ICsJc3RydWN0IHBhZ2UgKnBh Z2UgPSBOVUxMOwo+ICsKPiArCXNwaW5fbG9jaygmZG9tYWluLT5pb3RsYl9sb2NrKTsKPiArCW1h cCA9IHZob3N0X2lvdGxiX2l0cmVlX2ZpcnN0KGRvbWFpbi0+aW90bGIsIHN0YXJ0LCBsYXN0KTsK PiArCWlmICghbWFwKQo+ICsJCWdvdG8gb3V0Owo+ICsKPiArCXBhZ2UgPSBwZm5fdG9fcGFnZSgo bWFwLT5hZGRyICsgaW92YSAtIG1hcC0+c3RhcnQpID4+IFBBR0VfU0hJRlQpOwo+ICsJZ2V0X3Bh Z2UocGFnZSk7Cj4gK291dDoKPiArCXNwaW5fdW5sb2NrKCZkb21haW4tPmlvdGxiX2xvY2spOwo+ ICsKPiArCXJldHVybiBwYWdlOwo+ICt9Cj4gKwoKClsuLi5dCgoKPiArCj4gK3N0YXRpYyBkbWFf YWRkcl90Cj4gK3ZkdXNlX2RvbWFpbl9hbGxvY19pb3ZhKHN0cnVjdCBpb3ZhX2RvbWFpbiAqaW92 YWQsCj4gKwkJCXVuc2lnbmVkIGxvbmcgc2l6ZSwgdW5zaWduZWQgbG9uZyBsaW1pdCkKPiArewo+ ICsJdW5zaWduZWQgbG9uZyBzaGlmdCA9IGlvdmFfc2hpZnQoaW92YWQpOwo+ICsJdW5zaWduZWQg bG9uZyBpb3ZhX2xlbiA9IGlvdmFfYWxpZ24oaW92YWQsIHNpemUpID4+IHNoaWZ0Owo+ICsJdW5z aWduZWQgbG9uZyBpb3ZhX3BmbjsKPiArCj4gKwlpZiAoaW92YV9sZW4gPCAoMSA8PCAoSU9WQV9S QU5HRV9DQUNIRV9NQVhfU0laRSAtIDEpKSkKPiArCQlpb3ZhX2xlbiA9IHJvdW5kdXBfcG93X29m X3R3byhpb3ZhX2xlbik7CgoKTGV0J3MgYWRkIGEgY29tbWVudCBhcyB3aGF0IGhhcyBiZWVuIGRv bmUgaW4gZG1hLWlvbW11LmM/CgooSW4gdGhlIGZ1dHVyZSwgaXQgbG9va3MgdG8gbWUgaXQncyBi ZXR0ZXIgdG8gbW92ZSB0aGVtIHRvIAphbGxvY19pb3ZhX2Zhc3QoKSkuCgpUaGFua3MKCgpfX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpWaXJ0dWFsaXphdGlv biBtYWlsaW5nIGxpc3QKVmlydHVhbGl6YXRpb25AbGlzdHMubGludXgtZm91bmRhdGlvbi5vcmcK aHR0cHM6Ly9saXN0cy5saW51eGZvdW5kYXRpb24ub3JnL21haWxtYW4vbGlzdGluZm8vdmlydHVh bGl6YXRpb24=