From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brian Woods Subject: Re: [PATCH 3/3] x86/spec-ctrl: Add support for modifying SSBD AMD VIA LS_CFG MSR Date: Mon, 6 Aug 2018 14:07:40 -0500 Message-ID: <20180806190739.GA25520@amd.com> References: <20180720145736.126487-1-brian.woods@amd.com> <20180720145736.126487-4-brian.woods@amd.com> <5B60472702000078001D9662@prv1-mh.provo.novell.com> <20180801222047.GC3914@amd.com> <5B62AE1202000078001DA263@prv1-mh.provo.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Content-Disposition: inline In-Reply-To: <5B62AE1202000078001DA263@prv1-mh.provo.novell.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Jan Beulich Cc: Andrew Cooper , Brian Woods , xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org T24gVGh1LCBBdWcgMDIsIDIwMTggYXQgMDE6MDk6MDZBTSAtMDYwMCwgSmFuIEJldWxpY2ggd3Jv dGU6Cj4gPj4+IE9uIDAyLjA4LjE4IGF0IDAwOjIwLCA8YnJpYW4ud29vZHNAYW1kLmNvbT4gd3Jv dGU6Cj4gPiBPbiBUdWUsIEp1bCAzMSwgMjAxOCBhdCAwNToyNToyN0FNIC0wNjAwLCBKYW4gQmV1 bGljaCB3cm90ZToKPiA+PiBDb2RlIHN0cnVjdHVyZSB3aXNlIHRoaXMgbG9va3MgdG8gdW5kbyBh IGZhaXIgcGFydCBvZiB3aGF0IHBhdGNoCj4gPj4gMSBoYXMgZG9uZS4gSXQgd291bGQgYmUgbmlj ZSB0byBsaW1pdCBjb2RlIGNodXJuLgo+ID4gCj4gPiBQYXRjaCAxIHN0YW5kIGFsb25lIGp1c3Qg dG8gaW1wcm92ZSByZXBvcnRpbmcgdGhlIGNhcGFiaWxpdGllcyBvZiB0aGUKPiA+IHByb2Nlc3Nv ci4gIEN1cnJlbnRseSBYZW4gZG9lc24ndCBtZW50aW9uIGFueXRoaW5nIGlmIFNTQkQgaXMgYWN0 dWFsbHkKPiA+IGVuYWJsZSBvbiBBTUQgcHJvY2Vzc29ycy4gIFBhdGNoIDItMyBhZGQgaXQgd2hl cmUgWGVuIGNhbiBpdAo+ID4gZHluYW1pY2FsbHkuCj4gCj4gV2hpY2ggaXMgYWxsIGZpbmUsIGJ1 dCBjb3VsZG4ndCBwYXRjaCAxIGJlIHdyaXR0ZW4gaW4gYSB3YXkgdGhhdCB0aGUKPiBuZXh0IG9u ZShzKSBkb24ndCBoYXZlIHRvIHR1cm4gY29kZSBzdHJ1Y3R1cmUgYWxsIG92ZXIgYWdhaW4uCgpS YXRoZXIgdGhhbiBjaGFuZ2UgMSwgSSBjaGFuZ2VkIHBhdGNoIDMgKHdlbGwgbm93IHBhdGNoIDIp LgoKPiA+PiBXaHkgY2FuJ3QgdGhpcyBiZSBjYWxsZWQgZnJvbSBpbml0X3NwZWN1bGF0aW9uX21p dGlnYXRpb25zKCk/Cj4gPiAKPiA+IElJUkMgSSB3YXMgaGF2aW5nIG1lbW9yeSBpbml0IHByb2Js ZW1zIHdpdGguICBJdCB3YXMgbW92ZWQgdG8gbGF0ZXIgaW4KPiA+IHRoZSBib290IHNvIHRoYXQg eG1hbGxvYyB3b3VsZCB3b3JrIGNvcnJlY3RseS4gIEkgaGF2ZW4ndCB0b3VjaGVkIHRoaXMKPiA+ IGNvZGUgaW4gb3ZlciBtb250aC4gIElmIHlvdSB3YW50IGEgMTAwJSB0ZXN0ZWQgYW5zd2VyIEkg Y2FuIHJldGVzdAo+ID4gcHV0dGluZyBpdCBpbiBpbml0X3NwZWN1bGF0aW9uX21pdGlnYXRpb25z KCkuCj4gCj4gV291bGQgYmUgbmljZSBpZiB0aGF0IGNvdWxkIGJlIGFycmFuZ2VkIGZvciwgYXMg dGhlIHJhdGhlciBzcGVjaWFsaXplZAo+IGNhbGwgbG9va3MgcHJldHR5IG9kZCBpbiAoaWlyYyBf X3N0YXJ0X3hlbigpOyBpaXJjIGJlY2F1c2UgeW91J3ZlIGRyb3BwZWQKPiB0b28gbXVjaCBvZiB0 aGUgY29udGV4dCBpbiB5b3VyIHJlcGx5LCBhbmQgSSdtIHRvbyBsYXp5IHRvIGRpZyBvdXQgdGhl Cj4gb3JpZ2luYWwgcGF0Y2ggYWdhaW4pLgoKSXQgd2FzIF9fc3RhcnRfeGVuKCkuICBXZWxsLCBJ SVJDIHhhbGxvYyBkaWRuJ3Qgd29yayAod2VsbCB3cml0aW5nIHRvCnRoZSBhZGRyZXNzIGdpdmVu KSB1bnRpbCBhZnRlciBhcmNoX2luaXRfbWVtb3J5KCkuICBGb3IgaXQgdG8gd29yayBpbgppbml0 X3NwZWN1bGF0aW9uX21pdGlnYXRpb25zKCksIEknZCBhc3N1bWUgeW91J2QgbmVlZCB0byBjYWxs CmFyY2hfaW5pdF9tZW1vcnkoKSBiZWZvcmUgaW5pdF9zcGVjdWxhdGlvbl9taXRpZ2F0aW9ucygp LgoKPiA+PiBZb3UgcmVhbGx5IHNob3VsZCBub3RpY2Ugc3VjaCBhbm9tYWxpZXMgLyBpbmNvbnNp c3RlbmNpZXMgeW91cnNlbGY6Cj4gPj4gWW91IHByb3Blcmx5IHVzZSB1aW50NjRfdCBoZXJlLCBz byB3aHkgbm90IGFsc28gdWludDMyX3Qgb24gdGhlCj4gPj4gcHJlY2VkaW5nIGxpbmU/IFRoYXQg c2FpZCAtIHdoeSBhIGZpeGVkIHdpZHRoIHR5cGUgYW55d2F5IGZvcgo+ID4+IHRob3NlIHZhcmlh YmxlcyAtIHVuc2lnbmVkIGludCBsb29rcyB0byBiZSBqdXN0IGZpbmUgdGhlcmUuCj4gPiAKPiA+ IElJUkMgdGhleSdyZSBfXzMyIGluIHN0cnVjdCBJJ20gcmVhZGluZyBmcm9tIHNvIEkgZGVjaWRl ZCB0byB1c2UgdGhhdC4KPiA+IEkgY2FuIGNoYW5nZSB0aGVtIHRob3VnaCwgdGhhdCdzIGVhc2ls eS4KPiAKPiBUaGFua3MgLSB3ZSBwcmVmZXIgdG8gYXZvaWQgdTxOPiBhbmQgczxOPiBpbiBmYXZv ciBvZiB1aW50PE4+X3QKPiBhbmQgaW50PE4+X3QgaW4gbmV3IGNvZGUsIGFuZCBfX3U8Tj4gYXMg d2VsbCBhcyBfX3M8Tj4gc2hvdWxkCj4gZ28gYXdheSByYXRoZXIgc29vbmVyIHRoYW4gbGF0ZXIg YW55d2F5LCBhcyByZXByZXNlbnRpbmcgbmFtZQo+IHNwYWNlIHZpb2xhdGlvbnMgKF9fczgsIGZv ciBleGFtcGxlLCBhbHJlYWR5IGxvb2tzIHRvIGJlIHVudXNlZCkuCgpOb3RlZCwgSSd2ZSBjaGFu Z2VkIGFsbCBvZiB0aGVtLgoKPiA+PiBUaGlzIGZ1bmN0aW9uIGlzIGNhbGxlZCBmcm9tIGV4YWN0 bHkgb25lIHBsYWNlLCB3aXRoIHRoZQo+ID4+IHBhcmFtZXRlciBzZXQgdG8gdHJ1ZS4gTWFrZXMg bWUgd29uZGVyIHdoYXQgdGhlIGFjdHVhbAo+ID4+IHB1cnBvc2Ugb2YgdGhpcyBwYXRjaCBpcy4K PiA+IAo+ID4gU2VlIGVhcmxpZXIgaW4gdGhpcyBlbWFpbC4KPiAKPiBXaGVyZT8gSSBjYW4ndCBm aW5kIGFueXRoaW5nIGFzIHRvIHRoZSBwdXJwb3NlLiBZb3VyIHJlc3BvbnNlIHRvCj4gcGF0Y2gg MSdzIGNvbW1lbnRzIG9uIG1pbmUgbWlnaHQgaGF2ZSBiZWVuIGEgaGludCwgYnV0IHRoZW4gYWdh aW4KPiB0aGUgZnVuY3Rpb24gcGFyYW1ldGVyIGhlcmUgc2VlbXMgY29udHJhcnkgdG8gdGhlIGFs dGVybmF0aXZlcwo+IHBhdGNoaW5nIHBsYW5zLCBhdCBsZWFzdCBhdCB0aGUgZmlyc3QgZ2xhbmNl LiBJZiB5b3Ugd2FudCB0byBrZWVwCj4gdGhlIHBhcmFtZXRlciAocmF0aGVyIHRoYW4gaW50cm9k dWNpbmcgaXQgd2hlbiBuZWVkZWQpLCBwbGVhc2UgYXQKPiBsZWFzdCBvdXRsaW5lIHRoZSBwbGFu cyBpbiB0aGUgZGVzY3JpcHRpb24uCgpUbyBiZSBob25lc3QsIEkgYXNzdW1lZCB0aGF0IG9ubHkg cGF0Y2ggMSB3b3VsZCBnZXQgYWNjZXB0ZWQgYW5kIHRoZW4Kb25jZSB0aGVyZSB3YXMgdGhlIGlu ZnJhc3RydWN0dXJlIChhbHRlcm5hdGl2ZSBjIGZ1bmNzKSwgSSdkIHJld29yayB0aGUKcmVzdCBp bnRvIGEgcGF0Y2ggc2V0IHRoYXQgd291bGQgaW50cm9kdWNlIGFsbG93aW5nIEhWTSBndWVzdHMg dG8KY2hhbmdlIFNTQkQgdmlhIE1TUiBpbnRlcmNlcHRpb24gKHNpbmNlIHRoZXJlIGlzIHNvbWUg aW50ZXJlc3QgaW4KdGhhdCkuICBJIGd1ZXNzIEkgc2hvdWxkIGhhdmUgYmVlbiBjbGVhcmVyIHVw IGZyb250IGFib3V0IGl0LgoKPiA+PiBTdGlsbCBJIHdvbmRlciB3aGV0aGVyIGxlc3MgY29kZSBk dXBsaWNhdGlvbiB3b3VsZG4ndCBiZSBiZXR0ZXIuCj4gPiAKPiA+IGN1cnJlbnRfY3B1X2RhdGEg aXNuJ3QgYXZhaWxhYmxlIHdoZW4gc3NiZF9hbWRfbHNfY2ZnX2luaXQgaXMgY2FsbGVkLgo+IAo+ IEJ5ICJpc24ndCBhdmFpbGFibGUiIHlvdSBtZWFuICJoYXNuJ3QgYmVlbiBwb3B1bGF0ZWQgeWV0 Ij8gRWxzZQo+IEkgZG9uJ3QgdW5kZXJzdGFuZC4KCkl0IGhhc24ndCBiZWVuIHBvcHVsYXRlZCB5 ZXQuCgo+ID4+IEkgZmluZCBzdWNoIGEgaGFyZC1jb2RlZCB1cHBlciBib3VuZCBxdWl0ZSBjb25j ZXJuaW5nLiBJcyBucl9zb2NrZXRzCj4gPj4gbm90IGNvcnJlY3QgaW4gdGhlIEFNRCBjYXNlPyBJ ZiBzbywgdGhhdCB3b3VsZCB3YW50IGZpeGluZywgc3VjaCB0aGF0Cj4gPj4geW91IGNhbiB1c2Ug dGhlIHZhcmlhYmxlIGhlcmUuCj4gPiAKPiA+IEl0J3MgYmVlbiBhIHdoaWxlIHNpbmNlIEkgd3Jv dGUgdGhpcyBidXQgSUlSQywgaXQgaGFzIHRvIGRvIHdpdGgKPiA+IG5yX3NvY2tldHMgZWl0aGVy IGJlaW5nIG9mZiBvciBub3QgYXZhaWxhYmxlIHdoZW4gdGhlIGNvZGUgaXMgcnVuLgo+ID4gRm9y IEZhbWlseSAxN2ggd2hpY2ggdGhlIHBhdGNoZXMgYXJlIGZvciwgdGhlcmUncyBhIG1heCBvZiB0 d28gc29ja2V0cy4KPiAKPiBJJ3ZlIGltcGxpZWQgdGhhdCBmcm9tIGhvdyB5b3Ugd3JvdGUgdGhl IHBhdGNoZXMsIGJ1dCBzdWNoIGhhcmQgY29kaW5nCj4gd2lsbCBvbmx5IG1ha2UgZm9yIG1vcmUg Y29kZSBjaHVybiBsYXRlciBvbi4gVHJ5IHRvIGJlIGFzIGdlbmVyaWMgYXMKPiBwb3NzaWJsZS4K CldlbGwsIG5yX3NvY2tldHMgZ2V0cyBzZXQgaW4gc21wX3ByZXBhcmVfY3B1cywgd2hpY2ggZ2V0 cyBjYWxsZWQgYWZ0ZXIKaW5pdF9zcGVjdWxhdGlvbl9taXRpZ2F0aW9ucygpIGFuZCBzc2JkX2Ft ZF9sc19jZmdfaW5pdCgpLiAgSXQgY291bGQgYmUKcHV0IGxhdGVyIG9uIGluIHRoZSBib290LCBi dXQgaXQgbmVlZHMgdG8gYmUgcnVuIGF0IGxlYXN0IGJlZm9yZSBvdGhlcgpjcHVzIGFyZSBicm91 Z2h0IG9ubGluZS4gIEknbSB3ZWxjb21lIHRvIGFueSBzdWdnZXN0aW9ucyBhYm91dCBob3cgdG8K cmVzdHJ1Y3R1cmUgdGhpbmdzIHRob3VnaC4KCkFsc28sIHNldHRpbmdzIFNTQkQgdmlhIHRoZSBM U19DRkcgTVNSIGlzIG5vdCBhIHBlcm1hbmVudCBtZXRob2QuICBPbmNlCmhhcmR3YXJlIHN1cHBv cnRzIHVzaW5nIFNQRUNfQ1RSTCBmb3IgaXQsIGl0IHdvbid0IGJlIG5lZWRlZC4gIEZvcgptdWx0 aXNvY2tldCBzeXN0ZW1zLCB0aGVyZSBzaG91bGQgb25seSBiZSAyIHNvY2tldHMuICBJIGFncmVl IHdpdGgKbWFraW5nIHRoaW5ncyBnZW5lcmljLCBidXQgdGhpcyBlYXJseSBpbiB0aGUgYm9vdCB0 aGVyZSdzIGxpbWl0ZWQKaW5mb3JtYXRpb24uCgo+ID4+IEJ0dyAtIHdoeSB0aGUgeGVuXyBwcmVm aXggZm9yIHRoZSB2YXJpYWJsZT8KPiA+IAo+ID4gU2VlIHRoZSBmaXJzdCByZXBseSwgYnV0IGJh c2ljYWxseSBpdCdzIGZvciBpZiBYZW4gaGFzIFNTQkQgdHVybmVkIG9uCj4gPiBvciBub3Qgdmlh IHVzaW5nIHRoZSBMU19DRkcgTVNSLgo+IAo+IFBlcnNvbmFsbHkgSSdkIHByZWZlciBpZiB0aGUg eGVuXy1wcmVmaXhlZCBzdWItbmFtZS1zcGFjZSB3YXMgbGVmdCB0bwo+IHRoZSBwdWJsaWMgaW50 ZXJmYWNlLiBNYWtlIGl0IGFuIGluZml4IGlmIHlvdSB3YW50IHRvIGV4cHJlc3Mgd2hhdCB5b3Un dmUKPiBleHBsYWluZWQ/Cj4gCj4gSmFuCgpOb3RlZC4gIEknbGwgY2hhbmdlIHRoYXQuCgpUaGFu a3MgYWdhaW4gZm9yIHRoZSBmZWVkYmFjay4KCi0tIApCcmlhbiBXb29kcwoKX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLWRldmVsIG1haWxpbmcgbGlz dApYZW4tZGV2ZWxAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6Ly9saXN0cy54ZW5wcm9qZWN0 Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi1kZXZlbA==