From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Lutomirski Subject: Re: [PATCH] x86/xen: support early interrupts in xen pv guests Date: Fri, 24 Nov 2017 07:50:28 -0800 Message-ID: References: <20171124084221.30172-1-jgross@suse.com> <055898e5-a122-2f8a-c141-d3bca75a7045@suse.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mail6.bemta5.messagelabs.com ([195.245.231.135]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eIGFh-00047d-3H for xen-devel@lists.xenproject.org; Fri, 24 Nov 2017 15:50:53 +0000 Received: from mail-it0-f42.google.com (mail-it0-f42.google.com [209.85.214.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A2F3D219A5 for ; Fri, 24 Nov 2017 15:50:49 +0000 (UTC) Received: by mail-it0-f42.google.com with SMTP id x13so14098327iti.4 for ; Fri, 24 Nov 2017 07:50:49 -0800 (PST) In-Reply-To: <055898e5-a122-2f8a-c141-d3bca75a7045@suse.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Juergen Gross Cc: X86 ML , "linux-kernel@vger.kernel.org" , Ingo Molnar , Andrew Lutomirski , "H. Peter Anvin" , "xen-devel@lists.xenproject.org" , Boris Ostrovsky , Thomas Gleixner List-Id: xen-devel@lists.xenproject.org T24gRnJpLCBOb3YgMjQsIDIwMTcgYXQgMTI6NTIgQU0sIEp1ZXJnZW4gR3Jvc3MgPGpncm9zc0Bz dXNlLmNvbT4gd3JvdGU6Cj4gU29ycnksIEFuZHksIGZvcmdvdCB0byBDYzogeW91Li4uCj4KPiBP biAyNC8xMS8xNyAwOTo0MiwgSnVlcmdlbiBHcm9zcyB3cm90ZToKPj4gQWRkIGVhcmx5IGludGVy cnVwdCBoYW5kbGVycyBhY3RpdmF0ZWQgYnkgaWR0X3NldHVwX2Vhcmx5X2hhbmRsZXIoKSB0bwo+ PiB0aGUgaGFuZGxlcnMgc3VwcG9ydGVkIGJ5IFhlbiBwdiBndWVzdHMuIFRoaXMgd2lsbCBhbGxv dyBmb3IgZWFybHkKPj4gV0FSTigpIGNhbGxzIG5vdCBjcmFzaGluZyB0aGUgZ3Vlc3QuCgpOaWNl ISAgSXQgd291bGQgYmUgZ3JlYXQgdG8gZ2V0IHRoaXMgaW50byA0LjE1LgoKPj4KPj4gU3VnZ2Vz dGVkLWJ5OiBBbmR5IEx1dG9taXJza2kgPGx1dG9Aa2VybmVsLm9yZz4KPj4gU2lnbmVkLW9mZi1i eTogSnVlcmdlbiBHcm9zcyA8amdyb3NzQHN1c2UuY29tPgo+PiAtLS0KPj4gIGFyY2gveDg2L2lu Y2x1ZGUvYXNtL3NlZ21lbnQuaCB8IDEyICsrKysrKysrKysrKwo+PiAgYXJjaC94ODYvbW0vZXh0 YWJsZS5jICAgICAgICAgIHwgIDQgKysrLQo+PiAgYXJjaC94ODYveGVuL2VubGlnaHRlbl9wdi5j ICAgIHwgMzcgKysrKysrKysrKysrKysrKysrKysrKysrLS0tLS0tLS0tLS0tLQo+PiAgYXJjaC94 ODYveGVuL3hlbi1hc21fNjQuUyAgICAgIHwgMTQgKysrKysrKysrKysrKysKPj4gIDQgZmlsZXMg Y2hhbmdlZCwgNTMgaW5zZXJ0aW9ucygrKSwgMTQgZGVsZXRpb25zKC0pCj4+Cj4+IGRpZmYgLS1n aXQgYS9hcmNoL3g4Ni9pbmNsdWRlL2FzbS9zZWdtZW50LmggYi9hcmNoL3g4Ni9pbmNsdWRlL2Fz bS9zZWdtZW50LmgKPj4gaW5kZXggYjIwZjlkNjIzZjljLi44ZjA5MDEyYjkyZTcgMTAwNjQ0Cj4+ IC0tLSBhL2FyY2gveDg2L2luY2x1ZGUvYXNtL3NlZ21lbnQuaAo+PiArKysgYi9hcmNoL3g4Ni9p bmNsdWRlL2FzbS9zZWdtZW50LmgKPj4gQEAgLTIzNiwxMSArMjM2LDIzIEBACj4+ICAgKi8KPj4g ICNkZWZpbmUgRUFSTFlfSURUX0hBTkRMRVJfU0laRSA5Cj4+Cj4+ICsvKgo+PiArICogeGVuX2Vh cmx5X2lkdF9oYW5kbGVyX2FycmF5IGlzIGZvciBYZW4gcHYgZ3Vlc3RzOiBmb3IgZWFjaCBlbnRy eSBpbgo+PiArICogZWFybHlfaWR0X2hhbmRsZXJfYXJyYXkgaXQgY29udGFpbnMgYSBwcmVxdWVs IGluIHRoZSBmb3JtIG9mCj4+ICsgKiBwb3AgJXJjeDsgcG9wICVyMTE7IGptcCBlYXJseV9pZHRf aGFuZGxlcl9hcnJheVtpXTsgc3VtbWluZyB1cCB0bwo+PiArICogbWF4IDggYnl0ZXMuCj4+ICsg Ki8KPj4gKyNkZWZpbmUgWEVOX0VBUkxZX0lEVF9IQU5ETEVSX1NJWkUgOAo+PiArCj4+ICAjaWZu ZGVmIF9fQVNTRU1CTFlfXwo+Pgo+PiAgZXh0ZXJuIGNvbnN0IGNoYXIgZWFybHlfaWR0X2hhbmRs ZXJfYXJyYXlbTlVNX0VYQ0VQVElPTl9WRUNUT1JTXVtFQVJMWV9JRFRfSEFORExFUl9TSVpFXTsK Pj4gIGV4dGVybiB2b2lkIGVhcmx5X2lnbm9yZV9pcnEodm9pZCk7Cj4+Cj4+ICsjaWYgZGVmaW5l ZChDT05GSUdfWDg2XzY0KSAmJiBkZWZpbmVkKENPTkZJR19YRU5fUFYpCj4+ICtleHRlcm4gY29u c3QgY2hhciB4ZW5fZWFybHlfaWR0X2hhbmRsZXJfYXJyYXlbTlVNX0VYQ0VQVElPTl9WRUNUT1JT XVtYRU5fRUFSTFlfSURUX0hBTkRMRVJfU0laRV07Cj4+ICsjZW5kaWYKPj4gKwo+PiAgLyoKPj4g ICAqIExvYWQgYSBzZWdtZW50LiBGYWxsIGJhY2sgb24gbG9hZGluZyB0aGUgemVybyBzZWdtZW50 IGlmIHNvbWV0aGluZyBnb2VzCj4+ICAgKiB3cm9uZy4gIFRoaXMgdmFyaWFudCBhc3N1bWVzIHRo YXQgbG9hZGluZyB6ZXJvIGZ1bGx5IGNsZWFycyB0aGUgc2VnbWVudC4KPj4gZGlmZiAtLWdpdCBh L2FyY2gveDg2L21tL2V4dGFibGUuYyBiL2FyY2gveDg2L21tL2V4dGFibGUuYwo+PiBpbmRleCAz MzIxYjQ0NmI2NmMuLjg4NzU0YmZkNDI1ZiAxMDA2NDQKPj4gLS0tIGEvYXJjaC94ODYvbW0vZXh0 YWJsZS5jCj4+ICsrKyBiL2FyY2gveDg2L21tL2V4dGFibGUuYwo+PiBAQCAtMSw2ICsxLDcgQEAK Pj4gICNpbmNsdWRlIDxsaW51eC9leHRhYmxlLmg+Cj4+ICAjaW5jbHVkZSA8bGludXgvdWFjY2Vz cy5oPgo+PiAgI2luY2x1ZGUgPGxpbnV4L3NjaGVkL2RlYnVnLmg+Cj4+ICsjaW5jbHVkZSA8eGVu L3hlbi5oPgo+Pgo+PiAgI2luY2x1ZGUgPGFzbS9mcHUvaW50ZXJuYWwuaD4KPj4gICNpbmNsdWRl IDxhc20vdHJhcHMuaD4KPj4gQEAgLTIxMiw4ICsyMTMsOSBAQCB2b2lkIF9faW5pdCBlYXJseV9m aXh1cF9leGNlcHRpb24oc3RydWN0IHB0X3JlZ3MgKnJlZ3MsIGludCB0cmFwbnIpCj4+ICAgICAg ICAqIE9sZCBDUFVzIGxlYXZlIHRoZSBoaWdoIGJpdHMgb2YgQ1Mgb24gdGhlIHN0YWNrCj4+ICAg ICAgICAqIHVuZGVmaW5lZC4gIEknbSBub3Qgc3VyZSB3aGljaCBDUFVzIGRvIHRoaXMsIGJ1dCBh dCBsZWFzdAo+PiAgICAgICAgKiB0aGUgNDg2IERYIHdvcmtzIHRoaXMgd2F5Lgo+PiArICAgICAg KiBYZW4gcHYgZG9tYWlucyBhcmUgbm90IHVzaW5nIHRoZSBkZWZhdWx0IF9fS0VSTkVMX0NTLgo+ PiAgICAgICAgKi8KPj4gLSAgICAgaWYgKHJlZ3MtPmNzICE9IF9fS0VSTkVMX0NTKQo+PiArICAg ICBpZiAoIXhlbl9wdl9kb21haW4oKSAmJiByZWdzLT5jcyAhPSBfX0tFUk5FTF9DUykKPj4gICAg ICAgICAgICAgICBnb3RvIGZhaWw7Cj4+Cj4+ICAgICAgIC8qCj4+IGRpZmYgLS1naXQgYS9hcmNo L3g4Ni94ZW4vZW5saWdodGVuX3B2LmMgYi9hcmNoL3g4Ni94ZW4vZW5saWdodGVuX3B2LmMKPj4g aW5kZXggNWIyYjNmM2Y2NTMxLi5mMjQxNGM2YzVlN2MgMTAwNjQ0Cj4+IC0tLSBhL2FyY2gveDg2 L3hlbi9lbmxpZ2h0ZW5fcHYuYwo+PiArKysgYi9hcmNoL3g4Ni94ZW4vZW5saWdodGVuX3B2LmMK Pj4gQEAgLTYyMiw3ICs2MjIsNyBAQCBzdGF0aWMgc3RydWN0IHRyYXBfYXJyYXlfZW50cnkgdHJh cF9hcnJheVtdID0gewo+PiAgICAgICB7IHNpbWRfY29wcm9jZXNzb3JfZXJyb3IsICAgICAgeGVu X3NpbWRfY29wcm9jZXNzb3JfZXJyb3IsICAgICAgZmFsc2UgfSwKPj4gIH07Cj4+Cj4+IC1zdGF0 aWMgYm9vbCBnZXRfdHJhcF9hZGRyKHZvaWQgKiphZGRyLCB1bnNpZ25lZCBpbnQgaXN0KQo+PiAr c3RhdGljIGJvb2wgX19yZWYgZ2V0X3RyYXBfYWRkcih2b2lkICoqYWRkciwgdW5zaWduZWQgaW50 IGlzdCkKPj4gIHsKPj4gICAgICAgdW5zaWduZWQgaW50IG5yOwo+PiAgICAgICBib29sIGlzdF9v a2F5ID0gZmFsc2U7Cj4+IEBAIC02NDQsNiArNjQ0LDE0IEBAIHN0YXRpYyBib29sIGdldF90cmFw X2FkZHIodm9pZCAqKmFkZHIsIHVuc2lnbmVkIGludCBpc3QpCj4+ICAgICAgICAgICAgICAgfQo+ PiAgICAgICB9Cj4+Cj4+ICsgICAgIGlmIChuciA9PSBBUlJBWV9TSVpFKHRyYXBfYXJyYXkpICYm Cj4+ICsgICAgICAgICAqYWRkciA+PSAodm9pZCAqKWVhcmx5X2lkdF9oYW5kbGVyX2FycmF5WzBd ICYmCj4+ICsgICAgICAgICAqYWRkciA8ICh2b2lkICopZWFybHlfaWR0X2hhbmRsZXJfYXJyYXlb TlVNX0VYQ0VQVElPTl9WRUNUT1JTXSkgewo+PiArICAgICAgICAgICAgIG5yID0gKCphZGRyIC0g KHZvaWQgKillYXJseV9pZHRfaGFuZGxlcl9hcnJheVswXSkgLwo+PiArICAgICAgICAgICAgICAg ICAgRUFSTFlfSURUX0hBTkRMRVJfU0laRTsKPj4gKyAgICAgICAgICAgICAqYWRkciA9ICh2b2lk ICopeGVuX2Vhcmx5X2lkdF9oYW5kbGVyX2FycmF5W25yXTsKPj4gKyAgICAgfQo+PiArCj4+ICAg ICAgIGlmIChXQVJOX09OKGlzdCAhPSAwICYmICFpc3Rfb2theSkpCj4+ICAgICAgICAgICAgICAg cmV0dXJuIGZhbHNlOwo+Pgo+PiBAQCAtMTI2Miw2ICsxMjcwLDIxIEBAIGFzbWxpbmthZ2UgX192 aXNpYmxlIHZvaWQgX19pbml0IHhlbl9zdGFydF9rZXJuZWwodm9pZCkKPj4gICAgICAgeGVuX3Nl dHVwX2dkdCgwKTsKPj4KPj4gICAgICAgeGVuX2luaXRfaXJxX29wcygpOwo+PiArCj4+ICsgICAg IC8qIExldCdzIHByZXN1bWUgUFYgZ3Vlc3RzIGFsd2F5cyBib290IG9uIHZDUFUgd2l0aCBpZCAw LiAqLwo+PiArICAgICBwZXJfY3B1KHhlbl92Y3B1X2lkLCAwKSA9IDA7Cj4+ICsKPj4gKyAgICAg LyoKPj4gKyAgICAgICogU2V0dXAgeGVuX3ZjcHUgZWFybHkgYmVjYXVzZSBpZHRfc2V0dXBfZWFy bHlfaGFuZGxlciBuZWVkcyBpdCBmb3IKPj4gKyAgICAgICogbG9jYWxfaXJxX2Rpc2FibGUoKSwg aXJxc19kaXNhYmxlZCgpLgo+PiArICAgICAgKgo+PiArICAgICAgKiBEb24ndCBkbyB0aGUgZnVs bCB2Y3B1X2luZm8gcGxhY2VtZW50IHN0dWZmIHVudGlsIHdlIGhhdmUKPj4gKyAgICAgICogdGhl IGNwdV9wb3NzaWJsZV9tYXNrIGFuZCBhIG5vbi1kdW1teSBzaGFyZWRfaW5mby4KPj4gKyAgICAg ICovCj4+ICsgICAgIHhlbl92Y3B1X2luZm9fcmVzZXQoMCk7Cj4+ICsKPj4gKyAgICAgaWR0X3Nl dHVwX2Vhcmx5X2hhbmRsZXIoKTsKPj4gKwo+PiAgICAgICB4ZW5faW5pdF9jYXBhYmlsaXRpZXMo KTsKPj4KPj4gICNpZmRlZiBDT05GSUdfWDg2X0xPQ0FMX0FQSUMKPj4gQEAgLTEyOTUsMTggKzEz MTgsNiBAQCBhc21saW5rYWdlIF9fdmlzaWJsZSB2b2lkIF9faW5pdCB4ZW5fc3RhcnRfa2VybmVs KHZvaWQpCj4+ICAgICAgICAqLwo+PiAgICAgICBhY3BpX251bWEgPSAtMTsKPj4gICNlbmRpZgo+ PiAtICAgICAvKiBMZXQncyBwcmVzdW1lIFBWIGd1ZXN0cyBhbHdheXMgYm9vdCBvbiB2Q1BVIHdp dGggaWQgMC4gKi8KPj4gLSAgICAgcGVyX2NwdSh4ZW5fdmNwdV9pZCwgMCkgPSAwOwo+PiAtCj4+ IC0gICAgIC8qCj4+IC0gICAgICAqIFNldHVwIHhlbl92Y3B1IGVhcmx5IGJlY2F1c2Ugc3RhcnRf a2VybmVsIG5lZWRzIGl0IGZvcgo+PiAtICAgICAgKiBsb2NhbF9pcnFfZGlzYWJsZSgpLCBpcnFz X2Rpc2FibGVkKCkuCj4+IC0gICAgICAqCj4+IC0gICAgICAqIERvbid0IGRvIHRoZSBmdWxsIHZj cHVfaW5mbyBwbGFjZW1lbnQgc3R1ZmYgdW50aWwgd2UgaGF2ZQo+PiAtICAgICAgKiB0aGUgY3B1 X3Bvc3NpYmxlX21hc2sgYW5kIGEgbm9uLWR1bW15IHNoYXJlZF9pbmZvLgo+PiAtICAgICAgKi8K Pj4gLSAgICAgeGVuX3ZjcHVfaW5mb19yZXNldCgwKTsKPj4gLQo+PiAgICAgICBXQVJOX09OKHhl bl9jcHVocF9zZXR1cCh4ZW5fY3B1X3VwX3ByZXBhcmVfcHYsIHhlbl9jcHVfZGVhZF9wdikpOwo+ Pgo+PiAgICAgICBsb2NhbF9pcnFfZGlzYWJsZSgpOwo+PiBkaWZmIC0tZ2l0IGEvYXJjaC94ODYv eGVuL3hlbi1hc21fNjQuUyBiL2FyY2gveDg2L3hlbi94ZW4tYXNtXzY0LlMKPj4gaW5kZXggOGEx MGM5YTllMmI1Li40MTdiMzM5ZTVjOGUgMTAwNjQ0Cj4+IC0tLSBhL2FyY2gveDg2L3hlbi94ZW4t YXNtXzY0LlMKPj4gKysrIGIvYXJjaC94ODYveGVuL3hlbi1hc21fNjQuUwo+PiBAQCAtMTUsNiAr MTUsNyBAQAo+Pgo+PiAgI2luY2x1ZGUgPHhlbi9pbnRlcmZhY2UveGVuLmg+Cj4+Cj4+ICsjaW5j bHVkZSA8bGludXgvaW5pdC5oPgo+PiAgI2luY2x1ZGUgPGxpbnV4L2xpbmthZ2UuaD4KPj4KPj4g IC5tYWNybyB4ZW5fcHZfdHJhcCBuYW1lCj4+IEBAIC01NCw2ICs1NSwxOSBAQCB4ZW5fcHZfdHJh cCBlbnRyeV9JTlQ4MF9jb21wYXQKPj4gICNlbmRpZgo+PiAgeGVuX3B2X3RyYXAgaHlwZXJ2aXNv cl9jYWxsYmFjawo+Pgo+PiArICAgICBfX0lOSVQKPj4gK0VOVFJZKHhlbl9lYXJseV9pZHRfaGFu ZGxlcl9hcnJheSkKPj4gKyAgICAgaSA9IDAKPj4gKyAgICAgLnJlcHQgTlVNX0VYQ0VQVElPTl9W RUNUT1JTCj4+ICsgICAgIHBvcCAlcmN4Cj4+ICsgICAgIHBvcCAlcjExCj4+ICsgICAgIGptcCBl YXJseV9pZHRfaGFuZGxlcl9hcnJheSArIGkqRUFSTFlfSURUX0hBTkRMRVJfU0laRQo+PiArICAg ICBpID0gaSArIDEKPj4gKyAgICAgLmZpbGwgeGVuX2Vhcmx5X2lkdF9oYW5kbGVyX2FycmF5ICsg aSpYRU5fRUFSTFlfSURUX0hBTkRMRVJfU0laRSAtIC4sIDEsIDB4Y2MKPj4gKyAgICAgLmVuZHIK Pj4gK0VORCh4ZW5fZWFybHlfaWR0X2hhbmRsZXJfYXJyYXkpCj4+ICsgICAgIF9fRklOSVQKPj4g Kwo+PiAgaHlwZXJjYWxsX2lyZXQgPSBoeXBlcmNhbGxfcGFnZSArIF9fSFlQRVJWSVNPUl9pcmV0 ICogMzIKPj4gIC8qCj4+ICAgKiBYZW42NCBpcmV0IGZyYW1lOgo+Pgo+CgpfX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpYZW4tZGV2ZWwgbWFpbGluZyBsaXN0 Clhlbi1kZXZlbEBsaXN0cy54ZW5wcm9qZWN0Lm9yZwpodHRwczovL2xpc3RzLnhlbnByb2plY3Qu b3JnL21haWxtYW4vbGlzdGluZm8veGVuLWRldmVs