From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Wang Subject: Re: [RFC PATCH V2 5/5] vhost: access vq metadata through kernel virtual address Date: Mon, 11 Mar 2019 15:40:31 +0800 Message-ID: <8b68a2a0-907a-15f5-a07f-fc5b53d7ea19@redhat.com> References: <1551856692-3384-1-git-send-email-jasowang@redhat.com> <1551856692-3384-6-git-send-email-jasowang@redhat.com> <20190307103503-mutt-send-email-mst@kernel.org> <20190307124700-mutt-send-email-mst@kernel.org> <20190307191622.GP23850@redhat.com> <20190308194845.GC26923@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20190308194845.GC26923@redhat.com> Content-Language: en-US List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: Andrea Arcangeli Cc: kvm@vger.kernel.org, "Michael S. Tsirkin" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-mm@kvack.org, Jerome Glisse List-Id: virtualization@lists.linuxfoundation.org Ck9uIDIwMTkvMy85IOS4iuWNiDM6NDgsIEFuZHJlYSBBcmNhbmdlbGkgd3JvdGU6Cj4gSGVsbG8g SmVzb24sCj4KPiBPbiBGcmksIE1hciAwOCwgMjAxOSBhdCAwNDo1MDozNlBNICswODAwLCBKYXNv biBXYW5nIHdyb3RlOgo+PiBKdXN0IHRvIG1ha2Ugc3VyZSBJIHVuZGVyc3RhbmQgaGVyZS4gRm9y IGJvb3N0aW5nIHRocm91Z2ggaHVnZSBUTEIsIGRvCj4+IHlvdSBtZWFuIHdlIGNhbiBkbyB0aGF0 IGluIHRoZSBmdXR1cmUgKGUuZyBieSBtYXBwaW5nIG1vcmUgdXNlcnNwYWNlCj4+IHBhZ2VzIHRv IGtlbnJlbCkgb3IgaXQgY2FuIGJlIGRvbmUgYnkgdGhpcyBzZXJpZXMgKG9ubHkgYWJvdXQgdGhy ZWUgNEsKPj4gcGFnZXMgd2VyZSB2bWFwcGVkIHBlciB2aXJ0cXVldWUpPwo+IFdoZW4gSSBhbnN3 ZXJlZCBhYm91dCB0aGUgYWR2YW50YWdlcyBvZiBtbXUgbm90aWZpZXIgYW5kIEkgbWVudGlvbmVk Cj4gZ3VhcmFudGVlZCAybS9naWdhcGFnZXMgd2hlcmUgYXZhaWxhYmxlLCBJIG92ZXJsb29rZWQg dGhlIGRldGFpbCB5b3UKPiB3ZXJlIHVzaW5nIHZtYXAgaW5zdGVhZCBvZiBrbWFwLiBTbyB3aXRo IHZtYXAgeW91J3JlIGFjdHVhbGx5IGRvaW5nCj4gdGhlIG9wcG9zaXRlLCBpdCBzbG93cyBkb3du IHRoZSBhY2Nlc3MgYmVjYXVzZSBpdCB3aWxsIGFsd2F5cyB1c2UgYSA0awo+IFRMQiBldmVuIGlm IFFFTVUgcnVucyBvbiBUSFAgb3IgZ2lnYXBhZ2VzIGh1Z2V0bGJmcy4KPgo+IElmIHRoZXJlJ3Mg anVzdCBvbmUgcGFnZSAob3IgYSBmZXcgcGFnZXMpIGluIGVhY2ggdm1hcCB0aGVyZSdzIG5vIG5l ZWQKPiBvZiB2bWFwLCB0aGUgbGluZWFyaXR5IHZtYXAgcHJvdmlkZXMgZG9lc24ndCBwYXkgb2Zm IGluIHN1Y2gKPiBjYXNlLgo+Cj4gU28gbGlrZWx5IHRoZXJlJ3MgZnVydGhlciByb29tIGZvciBp bXByb3ZlbWVudCBoZXJlIHRoYXQgeW91IGNhbgo+IGFjaGlldmUgaW4gdGhlIGN1cnJlbnQgc2Vy aWVzIGJ5IGp1c3QgZHJvcHBpbmcgdm1hcC92dW5tYXAuCj4KPiBZb3UgY2FuIGp1c3QgdXNlIGtt YXAgKG9yIGttYXBfYXRvbWljIGlmIHlvdSdyZSBpbiBwcmVlbXB0aWJsZQo+IHNlY3Rpb24sIHNo b3VsZCB3b3JrIGZyb20gYmgvaXJxKS4KPgo+IEluIHNob3J0IHRoZSBtbXUgbm90aWZpZXIgdG8g aW52YWxpZGF0ZSBvbmx5IHNldHMgYSAic3RydWN0IHBhZ2UgKgo+IHVzZXJyaW5ncGFnZSIgcG9p bnRlciB0byBOVUxMIHdpdGhvdXQgY2FsbHMgdG8gdnVubWFwLgo+Cj4gSW4gYWxsIGNhc2VzIGlt bWVkaWF0ZWx5IGFmdGVyIGd1cF9mYXN0IHJldHVybnMgeW91IGNhbiBhbHdheXMgY2FsbAo+IHB1 dF9wYWdlIGltbWVkaWF0ZWx5ICh3aGljaCBleHBsYWlucyB3aHkgSSdkIGxpa2UgYW4gb3B0aW9u IHRvIGRyb3AKPiBGT0xMX0dFVCBmcm9tIGd1cF9mYXN0IHRvIHNwZWVkIGl0IHVwKS4KPgo+IFRo ZW4geW91IGNhbiBjaGVjayB0aGUgc2VxdWVuY2VfY291bnRlciBhbmQgaW5jL2RlYyBjb3VudGVy IGluY3JlYXNlZAo+IGJ5IF9zdGFydC9fZW5kLiBUaGF0IHdpbGwgdGVsbCB5b3UgaWYgdGhlIHBh Z2UgeW91IGdvdCBhbmQgeW91IGNhbGxlZAo+IHB1dF9wYWdlIHRvIGltbWVkaWF0ZWx5IHVucGlu IGl0IG9yIGV2ZW4gdG8gZnJlZSBpdCwgY2Fubm90IGdvIGF3YXkKPiB1bmRlciB5b3UgdW50aWwg dGhlIGludmFsaWRhdGUgaXMgY2FsbGVkLgo+Cj4gSWYgc2VxdWVuY2UgY291bnRlcnMgYW5kIGNv dW50ZXIgdGVsbHMgdGhhdCBndXBfZmFzdCByYWNlZCB3aXRoIGFueXQKPiBtbXUgbm90aWZpZXIg aW52YWxpZGF0ZSB5b3UgY2FuIGp1c3QgcmVwZWF0IGd1cF9mYXN0LiBPdGhlcndpc2UgeW91J3Jl Cj4gZG9uZSwgdGhlIHBhZ2UgY2Fubm90IGdvIGF3YXkgdW5kZXIgeW91LCB0aGUgaG9zdCB2aXJ0 dWFsIHRvIGhvc3QKPiBwaHlzaWNhbCBtYXBwaW5nIGNhbm5vdCBjaGFuZ2UgZWl0aGVyLiBBbmQg dGhlIHBhZ2UgaXMgbm90IHBpbm5lZAo+IGVpdGhlci4gU28geW91IGNhbiBqdXN0IHNldCB0aGUg InN0cnVjdCBwYWdlICogdXNlcnJpbmdwYWdlID0gcGFnZSIKPiB3aGVyZSAicGFnZSIgd2FzIHRo ZSBvbmUgc2V0dXAgYnkgZ3VwX2Zhc3QuCj4KPiBXaGVuIGxhdGVyIHRoZSBpbnZhbGlkYXRlIHJ1 bnMsIHlvdSBjYW4ganVzdCBjYWxsIHNldF9wYWdlX2RpcnR5IGlmCj4gZ3VwX2Zhc3Qgd2FzIGNh bGxlZCB3aXRoICJ3cml0ZSA9IDEiIGFuZCB0aGVuIHlvdSBjbGVhciB0aGUgcG9pbnRlcgo+ICJ1 c2VycmluZ3BhZ2UgPSBOVUxMIi4KPgo+IFdoZW4geW91IG5lZWQgdG8gcmVhZC93cml0ZSB0byB0 aGUgbWVtb3J5Cj4ga21hcC9rbWFwX2F0b21pYyh1c2VycmluZ3BhZ2UpIHNob3VsZCB3b3JrLgoK ClllcywgSSd2ZSBjb25zaWRlcmVkIGttYXAoKSBmcm9tIHRoZSBzdGFydC4gVGhlIHJlYXNvbiBJ IGRvbid0IGRvIHRoYXQgCmlzIGxhcmdlIHZpcnRxdWV1ZSBtYXkgbmVlZCBtb3JlIHRoYW4gb25l IHBhZ2Ugc28gVkEgbWlnaHQgbm90IGJlIApjb250aWd1b3VzLiBCdXQgdGhpcyBpcyBwcm9iYWJs eSBub3QgYSBiaWcgaXNzdWUgd2hpY2gganVzdCBuZWVkIG1vcmUgCnRyaWNrcyBpbiB0aGUgdmhv c3QgbWVtb3J5IGFjY2Vzc29ycy4KCgo+Cj4gSW4gc2hvcnQgYmVjYXVzZSB0aGVyZSdzIG5vIGhh cmR3YXJlIGludm9sdmVtZW50IGhlcmUsIHRoZSBlc3RhYmxpc2hlZAo+IG1hcHBpbmcgaXMganVz dCB0aGUgcG9pbnRlciB0byB0aGUgcGFnZSwgdGhlcmUgaXMgbm8gbmVlZCBvZiBzZXR0aW5nCj4g dXAgYW55IHBhZ2V0YWJsZXMgb3IgdG8gZG8gYW55IFRMQiBmbHVzaGVzIChleGNlcHQgb24gMzJi aXQgYXJjaHMgaWYKPiB0aGUgcGFnZSBpcyBhYm92ZSB0aGUgZGlyZWN0IG1hcHBpbmcgYnV0IGl0 IG5ldmVyIGhhcHBlbnMgb24gNjRiaXQKPiBhcmNocykuCgoKSSBzZWUsIEkgYmVsaWV2ZSB3ZSBk b24ndCBjYXJlIG11Y2ggYWJvdXQgdGhlIHBlcmZvcm1hbmNlIG9mIDMyYml0IGFyY2hzIAoob3Ig d2UgY2FuIGp1c3QgZmFsbGJhY2sgdG8gY29weV90b191c2VyKCkgZnJpZW5kcykuIFVzaW5nIGRp cmVjdCAKbWFwcGluZyAoSSBndWVzcyBrZXJuZWwgd2lsbCBhbHdheXMgdHJ5IGh1Z2VwYWdlIGZv ciB0aGF0Pykgc2hvdWxkIGJlIApiZXR0ZXIgYW5kIHdlIGNhbiBldmVuIHVzZSBpdCBmb3IgdGhl IGRhdGEgdHJhbnNmZXIgbm90IG9ubHkgZm9yIHRoZSAKbWV0YWRhdGEuCgpUaGFua3MKCgo+Cj4g VGhhbmtzLAo+IEFuZHJlYQpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fXwpWaXJ0dWFsaXphdGlvbiBtYWlsaW5nIGxpc3QKVmlydHVhbGl6YXRpb25AbGlzdHMu bGludXgtZm91bmRhdGlvbi5vcmcKaHR0cHM6Ly9saXN0cy5saW51eGZvdW5kYXRpb24ub3JnL21h aWxtYW4vbGlzdGluZm8vdmlydHVhbGl6YXRpb24=