From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefano Stabellini Subject: Re: [PATCH 05/13] xen/arm: Add command line option to control SSBD mitigation Date: Wed, 30 May 2018 13:10:16 -0700 (PDT) Message-ID: References: <20180522174254.27551-1-julien.grall@arm.com> <20180522174254.27551-6-julien.grall@arm.com> <614031dd-3825-5c69-9083-7ececc303f34@arm.com> <8eeddff3-07b4-48ea-b599-02b89ccf887c@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1fO7QK-0001tg-AM for xen-devel@lists.xenproject.org; Wed, 30 May 2018 20:10:20 +0000 In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Julien Grall Cc: xen-devel@lists.xenproject.org, Stefano Stabellini , andre.przywara@arm.com List-Id: xen-devel@lists.xenproject.org T24gV2VkLCAzMCBNYXkgMjAxOCwgSnVsaWVuIEdyYWxsIHdyb3RlOgo+IE9uIDA1LzI5LzIwMTgg MTE6MzQgUE0sIFN0ZWZhbm8gU3RhYmVsbGluaSB3cm90ZToKPiA+IE9uIFR1ZSwgMjkgTWF5IDIw MTgsIEp1bGllbiBHcmFsbCB3cm90ZToKPiA+ID4gT24gMjUvMDUvMTggMjE6NTEsIFN0ZWZhbm8g U3RhYmVsbGluaSB3cm90ZToKPiA+ID4gPiBPbiBUaHUsIDI0IE1heSAyMDE4LCBKdWxpZW4gR3Jh bGwgd3JvdGU6Cj4gPiA+ID4gPiBPbiAyMy8wNS8xOCAyMzozNCwgU3RlZmFubyBTdGFiZWxsaW5p IHdyb3RlOgo+ID4gPiA+ID4gPiBPbiBUdWUsIDIyIE1heSAyMDE4LCBKdWxpZW4gR3JhbGwgID4+ Pj4KPiA+ID4gPiA+ID4gYXJtX3NtY2NjXzFfMV9zbWMoQVJNX1NNQ0NDX0FSQ0hfRkVBVFVSRVNf RklELAo+ID4gPiA+ID4gPiA+ICAgICAgICAgICAgICAgICAgICAgICAgICAgQVJNX1NNQ0NDX0FS Q0hfV09SS0FST1VORF8yX0ZJRCwgJnJlcyk7Cj4gPiA+ID4gPiA+ID4gLSAgICBpZiAoIChpbnQp cmVzLmEwICE9IDAgKQo+ID4gPiA+ID4gPiA+IC0gICAgICAgIHN1cHBvcnRlZCA9IGZhbHNlOwo+ ID4gPiA+ID4gPiA+ICAgICAtICAgIGlmICggc3VwcG9ydGVkICkKPiA+ID4gPiA+ID4gPiAtICAg ICAgICB0aGlzX2NwdShzc2JkX2NhbGxiYWNrX3JlcXVpcmVkKSA9IDE7Cj4gPiA+ID4gPiA+ID4g KyAgICBzd2l0Y2ggKCAoaW50KXJlcy5hMCApCj4gPiA+ID4gPiA+IAo+ID4gPiA+ID4gPiBQbGVh c2UgaW50cm9kdWNlIHRoaXMgc3dpdGNoIGluIHRoZSBwcmV2aW91cyBwYXRjaC4gQnV0IGl0IG1h a2VzCj4gPiA+ID4gPiA+IHNlbnNlCj4gPiA+ID4gPiA+IHRvIGFkZCB0aGUgc3NiZF9zdGF0ZSB2 YXJpYWJsZSBpbiB0aGlzIHBhdGNoLgo+ID4gPiA+ID4gCj4gPiA+ID4gPiBXZWxsLCB0aGF0J3Mg bm90IGdvaW5nIHRvIG1ha2UgdGhlIGRpZmYgc2ltcGxlciBoZXJlIGFzIHRoZSBzd2l0Y2gKPiA+ ID4gPiA+IHdpbGwgYmUKPiA+ID4gPiA+IGRpZmZlcmVudC4gU28gSSB3b3VsZCBrZWVwIHRoZSBw YXRjaCBsaWtlIHRoYXQuCj4gPiA+ID4gCj4gPiA+ID4gVGhlIHNwbGl0IGlzIGEgYml0IGlmZnkg dG8gbWUsIGJ1dCBpZiB5b3UgZG9uJ3Qgd2FudCB0byBjaGFuZ2UgaXQsIEkgY2FuCj4gPiA+ID4g bGl2ZSB3aXRoIGl0IGFueXdheS4KPiA+ID4gCj4gPiA+IEkgZG9uJ3QgdGhpbmsgdGhlIG90aGVy IHdheSB3aWxsIGhlbHAuIEJ1dCBJIHdpbGwgZG8gaXQuCj4gPiAKPiA+IFRoYW5rIHlvdQo+ID4g Cj4gPiAKPiA+ID4gPiA+ID4gCj4gPiA+ID4gPiA+ID4gKyAgICB7Cj4gPiA+ID4gPiA+ID4gKyAg ICBjYXNlIEFSTV9TTUNDQ19OT1RfU1VQUE9SVEVEOgo+ID4gPiA+ID4gPiA+ICsgICAgICAgIHNz YmRfc3RhdGUgPSBBUk1fU1NCRF9VTktOT1dOOwo+ID4gPiA+ID4gPiA+ICsgICAgICAgIHJldHVy biBmYWxzZTsKPiA+ID4gPiA+ID4gPiArCj4gPiA+ID4gPiA+ID4gKyAgICBjYXNlIEFSTV9TTUND Q19OT1RfUkVRVUlSRUQ6Cj4gPiA+ID4gPiA+ID4gKyAgICAgICAgc3NiZF9zdGF0ZSA9IEFSTV9T U0JEX01JVElHQVRFRDsKPiA+ID4gPiA+ID4gPiArICAgICAgICByZXR1cm4gZmFsc2U7Cj4gPiA+ ID4gPiA+ID4gKwo+ID4gPiA+ID4gPiA+ICsgICAgY2FzZSBBUk1fU01DQ0NfU1VDQ0VTUzoKPiA+ ID4gPiA+ID4gPiArICAgICAgICByZXF1aXJlZCA9IHRydWU7Cj4gPiA+ID4gPiA+ID4gKyAgICAg ICAgYnJlYWs7Cj4gPiA+ID4gPiA+ID4gKwo+ID4gPiA+ID4gPiA+ICsgICAgY2FzZSAxOiAvKiBN aXRpZ2F0aW9uIG5vdCByZXF1aXJlZCBvbiB0aGlzIENQVS4gKi8KPiA+ID4gPiA+ID4gPiArICAg ICAgICByZXF1aXJlZCA9IGZhbHNlOwo+ID4gPiA+ID4gPiA+ICsgICAgICAgIGJyZWFrOwo+ID4g PiA+ID4gPiAKPiA+ID4gPiA+ID4gVGhpcyBzaG91bGQgInJldHVybiBmYWxzZSIuCj4gPiA+ID4g PiAKPiA+ID4gPiA+IEl0IGlzIHBlcmZlY3RseSBmaW5lIHRvIGNvbnRpbnVlIGFzIGl0IGlzIHNh ZmUgdG8gZXhlY3V0ZQo+ID4gPiA+ID4gQVJDSF9XT1JLQVJPVU5EXzIgb24KPiA+ID4gPiA+IHRo YXQgQ1BVLgo+ID4gPiA+IAo+ID4gPiA+IFRoaXMgaXMgdGhlIGNhc2Ugd2hlcmUgbWl0aWdhdGlv biBpcyBub3QgcmVxdWlyZWQgYnV0IGlzc3VpbmcgdGhlIFNNQ0NDCj4gPiA+ID4gaXMgc2FmZS4g SW5zdGVhZCBvZiByZXR1cm5pbmcgaW1tZWRpYXRlbHksIHdlIGdvIHRocm91Z2ggdGhlIG5leHQK PiA+ID4gPiBzd2l0Y2g6Cj4gPiA+ID4gCj4gPiA+ID4gMSkgaWYgQVJNX1NTQkRfRk9SQ0VfRElT QUJMRSwgd2UgbWFrZSB0aGUgU01DQ0MKPiA+ID4gPiAyKSBpZiBBUk1fU1NCRF9SVU5USU1FLCB3 ZSBkbyBub3RoaW5nCj4gPiA+ID4gMykgaWYgQVJNX1NTQkRfRk9SQ0VfRU5BQkxFLCB3ZSBtYWtl IHRoZSBTTUNDQwo+ID4gPiA+IAo+ID4gPiA+IFdoYXQgaXMgdGhlIGRlc2lyZWQgb3V0Y29tZSBm b3IgdGhpcyBzaXR1YXRpb24/IE9idmlvdXNseSwgY29udGludWluZwo+ID4gPiA+IGZvcgo+ID4g PiA+IGNhc2UgMikgaXMgcG9pbnRsZXNzLCB3ZSBtaWdodCBhcyB3ZWxsIHJldHVybiBpbW1lZGlh dGVseS4gRm9yIDEpIGFuZCAzKQo+ID4gPiA+IGlzIHRoZSBpbnRlbnRpb24gdGhhdCB0aGUgU01D Q0Mgd2lsbCBhY3R1YWxseSBoYXZlIGFuIGVmZmVjdCBldmVuIGlmIHRoZQo+ID4gPiA+IG1pdGln YXRpb24gaXMgbm90IHJlcXVpcmVkPwo+ID4gPiAKPiA+ID4gV2hpbGUgdGhlIFNNQ0NDIGNhbGwg aW4gMSkgYW5kIDMpIHdpbGwgZG8gbm90aGluZyBmb3IgdGhvc2UgQ1BVcywgeW91IHdpbGwKPiA+ ID4gc3RpbGwgcHJpbnQgYSB3YXJuaW5nIG1lc3NhZ2UgaWYgdGhlIHVzZXIgY2hvb3NlIHRvIGZv cmNlIGVuYWJsZS9kaXNhYmxlCj4gPiA+IHRoZQo+ID4gPiBtaXRpZ2F0aW9uLgo+ID4gCj4gPiBQ cmludGluZyB3YXJuaW5ncyBjb3VsZCBiZSBhIGdvb2QgaWRlYS4gSG93ZXZlciwgSSB0aGluayB3 ZSBzaG91bGQgZG8KPiA+IHRoZSBzYW1lIHRoaW5nIGZvciAiMSIgYW5kIGZvciAiQVJNX1NNQ0ND X05PVF9SRVFVSVJFRCIsIGFuZCBtYXliZSBldmVuCj4gPiBmb3IgIkFSTV9TTUNDQ19OT1RfU1VQ UE9SVEVEIjogcHJpbnRpbmcgd2FybmluZ3MgZm9yIGFsbCBvciBmb3Igbm9uZS4KPiA+IAo+ID4g SSBhbHNvIG5vdGljZWQgdGhhdCBpZiB0aGUgZmlyc3QgU01DQ0MgcmV0dXJucyAiMSIgYW5kIHdl IGNvbnRpbnVlLCBpbiBjYXNlCj4gPiBzc2JkX3N0YXRlID09IEFSTV9TU0JEX0ZPUkNFX0VOQUJM RSwgInJlcXVpcmVkIiBnZXRzIGNoYW5nZWQgdG8KPiA+ICJ0cnVlIi4gIERvIHdlIHdhbnQgdG8g bGV0IHRoZSB1c2VyIGZvcmNlLWVuYWJsZSB0aGUgbWl0aWdhdGlvbiBldmVuCj4gPiB3aGVuIGl0 IHdpbGwgZG8gbm90aGluZz8gSSBhbSBub3QgcmVhbGx5IHN1cmUsIHByb2JhYmx5IG5vdD8gSW4g YW55IGNhc2UKPiA+IEkgd291bGQgcHJlZmVyIGlmIHdlIGtlcHQgdGhlIHNhbWUgYmVoYXZpb3Ig YWNyb3NzICIxIiBhbmQKPiA+ICJBUk1fU01DQ0NfTk9UX1JFUVVJUkVEIi4KPiAKPiBJIGRvbid0 IHRoaW5rIGl0IGlzIHJpZ2h0IG90IGV4cGVjdCB0aGUgc2FtZSBiZWhhdmlvciBmb3IgIjEiYW5k Cj4gIkFSTV9TTUNDQ19OT1RfUkVRVUlSRUQiLiBUaGVyZSBhcmUgbWFqb3JzIGRpZmZlcmVuY2Ug YmV0d2VlbiB0aG9zZSAyIGFuZAo+IEFSTV9TTUNDQ19OT1RfU1VQUE9SVEVELgo+IAo+IEZyb20g dGhlIHNwZWMgQVJNIERFTiAwMDcwQSBzZWN0aW9uIDIuMi41Ogo+IAktIElmIHlvdXIgZmlybXdh cmUgZG9lcyBub3Qgc3VwcG9ydCB0aGUgY2FsbCwgQVJNX1NNQ0NDX05PVF9TVVBQT1JURUQKPiB3 aWxsIGJlIHJldHVybmVkIGZvciAqYWxsKiBDUFVzLiBUaGlzIHdpbGwgaGFwcGVuIG9uIGN1cnJl bnQgZmlybXdhcmVzLgo+IAktIElmIHlvdXIgZmlybXdhcmUgaGFzIG1pdGlnYXRpb24gcGVybWFu ZW50bHkgZGlzYWJsZWQvZW5hYmxlZCBmb3IKPiAqYWxsKiBDUFVzLCBBUk1fU01DQ0NfTk9UX1JF UVVJUkVEIHdpbGwgYmUgcmV0dXJuZWQuCj4gCS0gSWYgb25lIG9mIHRoZSBDUFVzIGluIHRoZSBw bGF0Zm9ybSByZXF1aXJlIGR5bmFtaWMgbWl0aWdhdGlvbiwgdGhlCj4gY2FsbCB3aWxsIHJldHVy biAwIGZvciB0aGVtLiBUaGUgb3RoZXJzIENQVXMgd2lsbCByZXR1cm4gMS4KPiAKPiBQcmludGlu ZyBhIHdhcm5pbmcgZm9yIHRoZSBmaXJzdCB0d28gd2lsbCBsaWtlbHkgc2NhcmUgdGhlIHVzZXIg YmVjYXVzZSBpdCBpcwo+IGdvaW5nIHRvIGJlIHByaW50ZWQgb24gbW9zdCBvZiB0aGUgY3VycmVu dCBwbGF0Zm9ybXMuCj4gCj4gUHJpbnRpbmcgYSB3YXJuaW5nIGZvciB0aGUgbGFzdCBvbmUgbWFr ZXMgc2Vuc2UgYmVjYXVzZSB5b3Uga25vdyB0aGF0IG9uZSBvZgo+IHRoZSBDUFUgbWF5IGJlIGFm ZmVjdGVkLiBUaGF0IENQVSBtYXkgYmUgYnJpbmcgdXAgbGF0ZXIgb24uIFNvIHlvdSBvZmZlciBh Cj4gcHJpbnQgaW4gc2ltaWxhciBwbGFjZSBpbiB0aGUgbG9ncyB3aGF0ZXZlciB0aGUgcGxhdGZv cm0gaXMuCgpJIHNob3VsZCBoYXZlIHJlYWQgdGhlIHNwZWMgbW9yZSBjYXJlZnVsbHksIHRoYW5r cyBmb3IgdGhlIHBvaW50ZXIuClNvcnJ5IGFib3V0IHRoYXQuIEZpbmFsbHksIHRoZXNlIHBhdGNo ZXMgYXJlIHN0YXJ0aW5nIHRvIG1ha2Ugc2Vuc2UgOi0pCgpBbGwgcmlnaHQuIEkgY2FuIHNlZSB3 aHkgc3NiZF9zdGF0ZSBhbmQgc3NiZF9jYWxsYmFja19yZXF1aXJlZCBhcmUKc2VwYXJhdGUgYW5k IHRoZWlyIHB1cnBvc2UuIEFzaWRlIGZyb20gYWRkaW5nIG1vcmUgaW5mbyB0byB0aGUgY29tbWl0 Cm1lc3NhZ2UsIEknbGwgbWFrZSBhIGNvdXBsZSBvZiBkaWZmZXJlbnQgc3VnZ2VzdGlvbnM6Cgox KSBMZXQncyBjaGVjayBpZiBzc2JkX3N0YXRlID09IEFSTV9TU0JEX1VOS05PV04gfHwgc3NiZF9z dGF0ZSA9PQpBUk1fU1NCRF9NSVRJR0FURUQgYXQgdGhlIGJlZ2lubmluZyBvZiBoYXNfc3NiZF9t aXRpZ2F0aW9uIGFuZCByZXR1cm4KZWFybHkgaW4gdGhhdCBjYXNlLiBUaGlzIHdpbGwgaGVscCBj bGFyaWZ5IHRoZSBpbnRlbmRlZCBiZWhhdmlvciBhbmQKbWl0aWdhdGUgYnJva2VuIGZpcm13YXJl IHJldHVybmluZyBBUk1fU01DQ0NfTk9UX1NVUFBPUlRFRCBvbmx5IG9uIHNvbWUKY3B1cy4gVGhp cyBpcyBqdXN0IG9wdGlvbmFsLCBJIGFtIGZpbmUgZWl0aGVyIHdheS4KCjIpIENhbiB3ZSB0dXJu IHNzYmRfY2FsbGJhY2tfcmVxdWlyZWQgZnJvbSBhIHRoaXNfY3B1IHZhcmlhYmxlIHRvIGEKc2lu Z2xlIGNwdSBiaXRtYXNrPyBJdCBpcyBub3QgZ3JlYXQgdG8gaW50cm9kdWNlIGEgbmV3IHBlci1j cHUgdmFyaWJsZQpmb3IganVzdCBvbmUgYml0LiBJdCB3b3VsZCBzYXZlIHNwYWNlIGFuZCBtYWtl IGl0IGVhc2llciB0byBhY2Nlc3MgZnJvbQphc3NlbWJseSBhcyBhIGJpdG1hc2sgYXMgaXQgd291 bGQgcmVtb3ZlIHRoZSBuZWVkIGZvciB0aGUgbGRyX3RoaXNfY3B1Cm1hY3JvLiBJZiBJIGFtIHdy b25nIGFuZCB0aGUgYml0bWFzayBtYWtlcyB0aGluZ3MgbW9yZSBjb21wbGljYXRlZApyYXRoZXIg dGhhbiBzaW1wbGVyLCB0aGVuIGtlZXAgdGhlIGNvZGUgYXMgaXMgYW5kIGp1c3QgbWVudGlvbiBp dCBpbiB0aGUKbmV4dCB2ZXJzaW9uIG9mIHRoZSBwYXRjaC4KCl9fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fClhlbi1kZXZlbCBtYWlsaW5nIGxpc3QKWGVuLWRl dmVsQGxpc3RzLnhlbnByb2plY3Qub3JnCmh0dHBzOi8vbGlzdHMueGVucHJvamVjdC5vcmcvbWFp bG1hbi9saXN0aW5mby94ZW4tZGV2ZWw=