From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Durrant Subject: Re: [PATCH] x86/hvm/dmop: Only copy what is needed to/from the guest Date: Fri, 9 Feb 2018 15:49:49 +0000 Message-ID: References: <20180209153427.6029-1-ross.lagerwall@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: Content-Language: en-US List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Ross Lagerwall , "xen-devel@lists.xen.org" Cc: Andrew Cooper , Jan Beulich List-Id: xen-devel@lists.xenproject.org PiAtLS0tLU9yaWdpbmFsIE1lc3NhZ2UtLS0tLQ0KPiBGcm9tOiBSb3NzIExhZ2Vyd2FsbCBbbWFp bHRvOnJvc3MubGFnZXJ3YWxsQGNpdHJpeC5jb21dDQo+IFNlbnQ6IDA5IEZlYnJ1YXJ5IDIwMTgg MTU6NDkNCj4gVG86IFBhdWwgRHVycmFudCA8UGF1bC5EdXJyYW50QGNpdHJpeC5jb20+OyB4ZW4t ZGV2ZWxAbGlzdHMueGVuLm9yZw0KPiBDYzogSmFuIEJldWxpY2ggPGpiZXVsaWNoQHN1c2UuY29t PjsgQW5kcmV3IENvb3Blcg0KPiA8QW5kcmV3LkNvb3BlcjNAY2l0cml4LmNvbT4NCj4gU3ViamVj dDogUmU6IFtQQVRDSF0geDg2L2h2bS9kbW9wOiBPbmx5IGNvcHkgd2hhdCBpcyBuZWVkZWQgdG8v ZnJvbSB0aGUNCj4gZ3Vlc3QNCj4gDQo+IE9uIDAyLzA5LzIwMTggMDM6NDIgUE0sIFBhdWwgRHVy cmFudCB3cm90ZToNCj4gPj4gLS0tLS1PcmlnaW5hbCBNZXNzYWdlLS0tLS0NCj4gPj4gRnJvbTog Um9zcyBMYWdlcndhbGwgW21haWx0bzpyb3NzLmxhZ2Vyd2FsbEBjaXRyaXguY29tXQ0KPiA+PiBT ZW50OiAwOSBGZWJydWFyeSAyMDE4IDE1OjM0DQo+ID4+IFRvOiB4ZW4tZGV2ZWxAbGlzdHMueGVu Lm9yZw0KPiA+PiBDYzogUm9zcyBMYWdlcndhbGwgPHJvc3MubGFnZXJ3YWxsQGNpdHJpeC5jb20+ OyBKYW4gQmV1bGljaA0KPiA+PiA8amJldWxpY2hAc3VzZS5jb20+OyBBbmRyZXcgQ29vcGVyIDxB bmRyZXcuQ29vcGVyM0BjaXRyaXguY29tPjsNCj4gUGF1bA0KPiA+PiBEdXJyYW50IDxQYXVsLkR1 cnJhbnRAY2l0cml4LmNvbT4NCj4gPj4gU3ViamVjdDogW1BBVENIXSB4ODYvaHZtL2Rtb3A6IE9u bHkgY29weSB3aGF0IGlzIG5lZWRlZCB0by9mcm9tIHRoZQ0KPiA+PiBndWVzdA0KPiA+Pg0KPiA+ PiBkbV9vcCgpIGZhaWxzIHdpdGggLUVGQVVMVCBpZiB0aGUgc3RydWN0IHhlbl9kbV9vcCBnaXZl biBieSB0aGUgZ3Vlc3QgaXMNCj4gPj4gc21hbGxlciB0aGFuIFhlbidzIHN0cnVjdCB4ZW5fZG1f b3AuIFRoaXMgaXMgYSBwcm9ibGVtIGJlY2F1c2UgRE1PUCBpcw0KPiA+PiBtZWFudCB0byBiZSBh IHN0YWJsZSBBQkkgYnV0IGl0IGJyZWFrcyB3aGVuZXZlciB0aGUgc2l6ZSBvZiBzdHJ1Y3QNCj4g Pj4geGVuX2RtX29wIGNoYW5nZXMuDQo+ID4+DQo+ID4+IFRvIGZpeCB0aGlzLCBjaGFuZ2UgaG93 IHRoZSBjb3B5aW5nIHRvIGFuZCBmcm9tIHRoZSBndWVzdCBpcyBkb25lLiBXaGVuDQo+ID4+IGNv cHlpbmcgZnJvbSB0aGUgZ3Vlc3QsIGZpcnN0IGNvcHkgdGhlIGhlYWRlciBhbmQgaW5zcGVjdCB0 aGUgb3AuIFRoZW4sDQo+ID4+IG9ubHkgY29weSB0aGUgY29ycmVjdCBhbW91bnQgbmVlZGVkIGZv ciB0aGF0IG9wLiBXaGVuIGNvcHlpbmcgdG8gdGhlDQo+ID4+IGd1ZXN0LCBkb24ndCBjb3B5IHRo ZSBoZWFkZXIuIFJhdGhlciwgY29weSBvbmx5IHRoZSBjb3JyZWN0IGFtb3VudA0KPiA+PiBuZWVk ZWQgZm9yIHRoYXQgcGFydGljdWxhciBvcC4NCj4gPj4NCj4gPj4gU28gbm93IHRoZSBkbV9vcCgp IHdpbGwgZmFpbCBpZiB0aGUgZ3Vlc3QgZG9lcyBub3Qgc3VwcGx5IGVub3VnaCBieXRlcw0KPiA+ PiBmb3IgdGhlIHNwZWNpZmljIG9wLiBJdCB3aWxsIG5vdCBmYWlsIGlmIHRoZSBndWVzdCBzdXBw bGllcyB0b28gbWFueQ0KPiA+PiBieXRlcyBmb3IgdGhlIHNwZWNpZmljIG9wLCBidXQgWGVuIHdp bGwgbm90IGNvcHkgdGhlIGV4dHJhIGJ5dGVzLg0KPiA+Pg0KPiA+PiBSZW1vdmUgc29tZSBub3cg dW51c2VkIG1hY3JvcyBhbmQgaGVscGVyIGZ1bmN0aW9ucy4NCj4gPj4NCj4gPj4gU2lnbmVkLW9m Zi1ieTogUm9zcyBMYWdlcndhbGwgPHJvc3MubGFnZXJ3YWxsQGNpdHJpeC5jb20+DQo+ID4NCj4g PiBJJ20gc3VyZSB0aGF0IHdhcyBob3cgaXQgd2FzIHN1cHBvc2VkIHRvIHdvcmsgb3JpZ2luYWxs eSBidXQgaXQgZ290IGxvc3QNCj4gc29tZXdoZXJlIGFsb25nIHRoZSB3YXkuDQo+IA0KPiBPcmln aW5hbGx5IGl0IHplcm9lZCBzdHJ1Y3QgeGVuX2RtX29wIGFuZCB0aGVuIGNvcGllZCB3aGF0ZXZl ciB0aGUgZ3Vlc3QNCj4gcHJvdmlkZWQgKHVwIHRvIHRoZSBzaXplIG9mIHN0cnVjdCB4ZW5fZG1f b3ApIHdoaWNoIGlzIHNpbWlsYXIgdG8gdGhpcw0KPiBidXQgbm90IHF1aXRlIHRoZSBzYW1lLg0K PiANCj4gPg0KPiA+IFJldmlld2VkLWJ5OiBQYXVsIER1cnJhbnQgPHBhdWwuZHVycmFudEBjaXRy aXguY29tPiwgd2l0aCBvbmUNCj4gc3VnZ2VzdGlvbi4uLg0KPiA+DQo+ID4+IC0tLQ0KPiA+PiAg IHhlbi9hcmNoL3g4Ni9odm0vZG0uYyB8IDc4ICsrKysrKysrKysrKysrKysrKysrKysrKysrKy0t LS0tLS0tLQ0KPiAtLS0tLQ0KPiA+PiAtLS0tLS0tLS0tDQo+ID4+ICAgMSBmaWxlIGNoYW5nZWQs IDQyIGluc2VydGlvbnMoKyksIDM2IGRlbGV0aW9ucygtKQ0KPiA+Pg0KPiA+PiBkaWZmIC0tZ2l0 IGEveGVuL2FyY2gveDg2L2h2bS9kbS5jIGIveGVuL2FyY2gveDg2L2h2bS9kbS5jDQo+ID4+IGlu ZGV4IDgwODNkZWQuLjZjNzI3NmMgMTAwNjQ0DQo+ID4+IC0tLSBhL3hlbi9hcmNoL3g4Ni9odm0v ZG0uYw0KPiA+PiArKysgYi94ZW4vYXJjaC94ODYvaHZtL2RtLmMNCj4gPj4gQEAgLTU0LDQyICs1 NCwxMCBAQCBzdGF0aWMgYm9vbA0KPiBfcmF3X2NvcHlfZnJvbV9ndWVzdF9idWZfb2Zmc2V0KHZv aWQNCj4gPj4gKmRzdCwNCj4gPj4gICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg IG9mZnNldF9ieXRlcywgZHN0X2J5dGVzKTsNCj4gPj4gICB9DQo+ID4+DQo+IHNuaXANCj4gPj4g QEAgLTM3Miw2ICszNDAsMjggQEAgc3RhdGljIGludCBkbV9vcChjb25zdCBzdHJ1Y3QgZG1vcF9h cmdzDQo+ICpvcF9hcmdzKQ0KPiA+PiAgICAgICBzdHJ1Y3QgeGVuX2RtX29wIG9wOw0KPiA+PiAg ICAgICBib29sIGNvbnN0X29wID0gdHJ1ZTsNCj4gPj4gICAgICAgbG9uZyByYzsNCj4gPj4gKyAg ICBzaXplX3Qgb2Zmc2V0Ow0KPiA+PiArDQo+ID4+ICsgICAgc3RhdGljIGNvbnN0IHVpbnQ4X3Qg b3Bfc2l6ZVtdID0gew0KPiA+DQo+ID4gR2l2ZW4gdGhlIGNvcnJlc3BvbmRlbmNlIGJldHdlZW4g dGhlIG9wIGNvZGUgbmFtZSBhbmQgdGhlIHN0cnVjdA0KPiBuYW1lLCBpdCBtaWdodCBiZSB3b3J0 aCB1c2luZyBhIG1hY3JvIHRvIGhlbHAgd2l0aCB0aGlzIGFycmF5IGRlY2xhcmF0aW9uLg0KPiAN Cj4gUHJvYmFibHkuLi4gdGhlcmUgYXJlIGEgY291cGxlIG9mIGV4Y2VwdGlvbnMgdG8gdGhlIGNv cnJlc3BvbmRlbmNlIHRob3VnaC4NCg0KWWVhaCwgSSBrbm93LiBKdXN0IHRob3VnaHQgaXQgbWln aHQgbG9vayBuZWF0ZXIgb3ZlcmFsbCwgYnV0IGRvZXNuJ3QgbWF0dGVyLg0KDQogIFBhdWwNCiAN Cj4gLS0NCj4gUm9zcyBMYWdlcndhbGwNCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fClhlbi1kZXZlbCBtYWlsaW5nIGxpc3QKWGVuLWRldmVsQGxpc3RzLnhl bnByb2plY3Qub3JnCmh0dHBzOi8vbGlzdHMueGVucHJvamVjdC5vcmcvbWFpbG1hbi9saXN0aW5m by94ZW4tZGV2ZWw=