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[173.76.246.42]) by smtp.gmail.com with ESMTPSA id s186sm2889766qkb.57.2019.03.12.04.54.03 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 12 Mar 2019 04:54:04 -0700 (PDT) Date: Tue, 12 Mar 2019 07:54:02 -0400 From: "Michael S. Tsirkin" To: Jason Wang Subject: Re: [RFC PATCH V2 0/5] vhost: accelerate metadata access through vmap() Message-ID: <20190312075033-mutt-send-email-mst@kernel.org> References: <20190308141220.GA21082@infradead.org> <56374231-7ba7-0227-8d6d-4d968d71b4d6@redhat.com> <20190311095405-mutt-send-email-mst@kernel.org> <20190311.111413.1140896328197448401.davem@davemloft.net> <6b6dcc4a-2f08-ba67-0423-35787f3b966c@redhat.com> <20190311235140-mutt-send-email-mst@kernel.org> <76c353ed-d6de-99a9-76f9-f258074c1462@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <76c353ed-d6de-99a9-76f9-f258074c1462@redhat.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190312_045407_926861_A813DB92 X-CRM114-Status: GOOD ( 20.85 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: aarcange@redhat.com, linux-parisc@vger.kernel.org, kvm@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, peterx@redhat.com, virtualization@lists.linux-foundation.org, hch@infradead.org, linux-mm@kvack.org, David Miller , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gVHVlLCBNYXIgMTIsIDIwMTkgYXQgMDM6MTc6MDBQTSArMDgwMCwgSmFzb24gV2FuZyB3cm90 ZToKPiAKPiBPbiAyMDE5LzMvMTIg5LiK5Y2IMTE6NTIsIE1pY2hhZWwgUy4gVHNpcmtpbiB3cm90 ZToKPiA+IE9uIFR1ZSwgTWFyIDEyLCAyMDE5IGF0IDEwOjU5OjA5QU0gKzA4MDAsIEphc29uIFdh bmcgd3JvdGU6Cj4gPiA+IE9uIDIwMTkvMy8xMiDkuIrljYgyOjE0LCBEYXZpZCBNaWxsZXIgd3Jv dGU6Cj4gPiA+ID4gRnJvbTogIk1pY2hhZWwgUy4gVHNpcmtpbiIgPG1zdEByZWRoYXQuY29tPgo+ ID4gPiA+IERhdGU6IE1vbiwgMTEgTWFyIDIwMTkgMDk6NTk6MjggLTA0MDAKPiA+ID4gPiAKPiA+ ID4gPiA+IE9uIE1vbiwgTWFyIDExLCAyMDE5IGF0IDAzOjEzOjE3UE0gKzA4MDAsIEphc29uIFdh bmcgd3JvdGU6Cj4gPiA+ID4gPiA+IE9uIDIwMTkvMy84IOS4i+WNiDEwOjEyLCBDaHJpc3RvcGgg SGVsbHdpZyB3cm90ZToKPiA+ID4gPiA+ID4gPiBPbiBXZWQsIE1hciAwNiwgMjAxOSBhdCAwMjox ODowN0FNIC0wNTAwLCBKYXNvbiBXYW5nIHdyb3RlOgo+ID4gPiA+ID4gPiA+ID4gVGhpcyBzZXJp ZXMgdHJpZXMgdG8gYWNjZXNzIHZpcnRxdWV1ZSBtZXRhZGF0YSB0aHJvdWdoIGtlcm5lbCB2aXJ0 dWFsCj4gPiA+ID4gPiA+ID4gPiBhZGRyZXNzIGluc3RlYWQgb2YgY29weV91c2VyKCkgZnJpZW5k cyBzaW5jZSB0aGV5IGhhZCB0b28gbXVjaAo+ID4gPiA+ID4gPiA+ID4gb3ZlcmhlYWRzIGxpa2Ug Y2hlY2tzLCBzcGVjIGJhcnJpZXJzIG9yIGV2ZW4gaGFyZHdhcmUgZmVhdHVyZQo+ID4gPiA+ID4g PiA+ID4gdG9nZ2xpbmcuIFRoaXMgaXMgZG9uZSB0aHJvdWdoIHNldHVwIGtlcm5lbCBhZGRyZXNz IHRocm91Z2ggdm1hcCgpIGFuZAo+ID4gPiA+ID4gPiA+ID4gcmVzaWd0ZXIgTU1VIG5vdGlmaWVy IGZvciBpbnZhbGlkYXRpb24uCj4gPiA+ID4gPiA+ID4gPiAKPiA+ID4gPiA+ID4gPiA+IFRlc3Qg c2hvd3MgYWJvdXQgMjQlIGltcHJvdmVtZW50IG9uIFRYIFBQUy4gVENQX1NUUkVBTSBkb2Vzbid0 IHNlZQo+ID4gPiA+ID4gPiA+ID4gb2J2aW91cyBpbXByb3ZlbWVudC4KPiA+ID4gPiA+ID4gPiBI b3cgaXMgdGhpcyBnb2luZyB0byB3b3JrIGZvciBDUFVzIHdpdGggdmlydHVhbGx5IHRhZ2dlZCBj YWNoZXM/Cj4gPiA+ID4gPiA+IEFueXRoaW5nIGRpZmZlcmVudCB0aGF0IHlvdSB3b3JyeT8KPiA+ ID4gPiA+IElmIGNhY2hlcyBoYXZlIHZpcnR1YWwgdGFncyB0aGVuIGtlcm5lbCBhbmQgdXNlcnNw YWNlIHZpZXcgb2YgbWVtb3J5Cj4gPiA+ID4gPiBtaWdodCBub3QgYmUgYXV0b21hdGljYWxseSBp biBzeW5jIGlmIHRoZXkgYWNjZXNzIG1lbW9yeQo+ID4gPiA+ID4gdGhyb3VnaCBkaWZmZXJlbnQg dmlydHVhbCBhZGRyZXNzZXMuIFlvdSBuZWVkIHRvIGRvIHRoaW5ncyBsaWtlCj4gPiA+ID4gPiBm bHVzaF9jYWNoZV9wYWdlLCBwcm9iYWJseSBtdWx0aXBsZSB0aW1lcy4KPiA+ID4gPiAiZmx1c2hf ZGNhY2hlX3BhZ2UoKSIKPiA+ID4gCj4gPiA+IEkgZ2V0IHRoaXMuIFRoZW4gSSB0aGluayB0aGUg Y3VycmVudCBzZXRfYml0X3RvX3VzZXIoKSBpcyBzdXNwaWNpb3VzLCB3ZQo+ID4gPiBwcm9iYWJs eSBtaXNzIGEgZmx1c2hfZGNhY2hlX3BhZ2UoKSB0aGVyZToKPiA+ID4gCj4gPiA+IAo+ID4gPiBz dGF0aWMgaW50IHNldF9iaXRfdG9fdXNlcihpbnQgbnIsIHZvaWQgX191c2VyICphZGRyKQo+ID4g PiB7Cj4gPiA+ICDCoMKgwqDCoMKgwqDCoCB1bnNpZ25lZCBsb25nIGxvZyA9ICh1bnNpZ25lZCBs b25nKWFkZHI7Cj4gPiA+ICDCoMKgwqDCoMKgwqDCoCBzdHJ1Y3QgcGFnZSAqcGFnZTsKPiA+ID4g IMKgwqDCoMKgwqDCoMKgIHZvaWQgKmJhc2U7Cj4gPiA+ICDCoMKgwqDCoMKgwqDCoCBpbnQgYml0 ID0gbnIgKyAobG9nICUgUEFHRV9TSVpFKSAqIDg7Cj4gPiA+ICDCoMKgwqDCoMKgwqDCoCBpbnQg cjsKPiA+ID4gCj4gPiA+ICDCoMKgwqDCoMKgwqDCoCByID0gZ2V0X3VzZXJfcGFnZXNfZmFzdChs b2csIDEsIDEsICZwYWdlKTsKPiA+ID4gIMKgwqDCoMKgwqDCoMKgIGlmIChyIDwgMCkKPiA+ID4g IMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoCByZXR1cm4gcjsKPiA+ID4gIMKgwqDCoMKg wqDCoMKgIEJVR19PTihyICE9IDEpOwo+ID4gPiAgwqDCoMKgwqDCoMKgwqAgYmFzZSA9IGttYXBf YXRvbWljKHBhZ2UpOwo+ID4gPiAgwqDCoMKgwqDCoMKgwqAgc2V0X2JpdChiaXQsIGJhc2UpOwo+ ID4gPiAgwqDCoMKgwqDCoMKgwqAga3VubWFwX2F0b21pYyhiYXNlKTsKPiA+ID4gIMKgwqDCoMKg wqDCoMKgIHNldF9wYWdlX2RpcnR5X2xvY2socGFnZSk7Cj4gPiA+ICDCoMKgwqDCoMKgwqDCoCBw dXRfcGFnZShwYWdlKTsKPiA+ID4gIMKgwqDCoMKgwqDCoMKgIHJldHVybiAwOwo+ID4gPiB9Cj4g PiA+IAo+ID4gPiBUaGFua3MKPiA+IEkgdGhpbmsgeW91IGFyZSByaWdodC4gVGhlIGNvcnJlY3Qg Zml4IHRob3VnaCBpcyB0byByZS1pbXBsZW1lbnQKPiA+IGl0IHVzaW5nIGFzbSBhbmQgaGFuZGxp bmcgcGFnZWZhdWx0LCBub3QgZ3VwLgo+IAo+IAo+IEkgYWdyZWUgYnV0IGl0IG5lZWRzIHRvIGlu dHJvZHVjZSBuZXcgaGVscGVycyBpbiBhc23CoCBmb3IgYWxsIGFyY2hzIHdoaWNoIGlzCj4gbm90 IHRyaXZpYWwuCgpXZSBjYW4gaGF2ZSBhIGdlbmVyaWMgaW1wbGVtZW50YXRpb24gdXNpbmcga21h cC4KCj4gQXQgbGVhc3QgZm9yIC1zdGFibGUsIHdlIG5lZWQgdGhlIGZsdXNoPwo+IAo+IAo+ID4g VGhyZWUgYXRvbWljIG9wcyBwZXIgYml0IGlzIHdheSB0byBleHBlbnNpdmUuCj4gCj4gCj4gWWVz Lgo+IAo+IFRoYW5rcwoKU2VlIEphbWVzJ3MgcmVwbHkgLSBJIHN0YW5kIGNvcnJlY3RlZCB3ZSBk byBrdW5tYXAgc28gbm8gbmVlZCB0byBmbHVzaC4KCi0tIApNU1QKCl9fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmxpbnV4LWFybS1rZXJuZWwgbWFpbGluZyBs aXN0CmxpbnV4LWFybS1rZXJuZWxAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5m cmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LWFybS1rZXJuZWwK