From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x226MkUdYWAZTAjYTGccUu1139r2VlTgiUIc5wmPy3+6HCe4jWReOYAgoN0FHJWNzEYVsFKIa ARC-Seal: i=1; a=rsa-sha256; t=1516559407; cv=none; d=google.com; s=arc-20160816; b=oJNwAhTdtr96PbEPe5DAqrOsp4J35S3aj2FWPbgBIKxa2uFUKrEI/AeEIgGdE6ZCP+ mPuTw/bw6TJtAZuSf6Zq1G29Y+yEJ6rBUUqT4acguzgw5WSo6CX1NmEcLr4F/SracZFK LvBpYs8Zt1Tr74K2Qt0hZNKtbclXuMujjJp2dlN9dc7FhPpNBx4iSGrKTpiO36yyloqq 5QMdV2gjx0AP4s6NxHHwnSNxwFiY2f9TZ2hCa5dcreHDplQKIIrfFpI/X5VcALj5Qgt6 2CdrSF6M0gyjp5nAzqScADMRjJAsNglfhJv8gC8AmmOuYpbAZQ38Ht6KdjpxOVQ7yEwy rqlw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:precedence:content-language:in-reply-to :mime-version:user-agent:date:message-id:from:references:cc:to :subject:dkim-signature:arc-authentication-results; bh=aamaJ1EktT8uUS9cOqKoLs5ZkZy8hV0h1+SFFCUU9NE=; b=kE2D1xBA7xe6ra/dzFdx8j/wITnS9dGy403jNqlxWYjp7egpPpxYpftN0mXfUi8U/X 6Ety/60zyEZrlKt6XwQzbP4OC4oSSd3Us0MN5GjfLy41Y/u9ZRaitR7i4eRcm5sj8oo4 pTNRPN0b4yClWDUNzPAVPVNKOCCfdYmAYwYUO6cKl0tH+sa5nVFDh/f8VRfdmDfPhSdV MYBrezPmTFmN0lVKnDawAiwAEJwkBURBH2RF/+YUo0M8zEUmP+jihj2+Bk0Vdk8+/vm0 CANptAygI0t43HsNbeer/9kq9YD69wcgMrxM4Q6GpKLlRato+o5btMyK0Jg8AwoAElFL O8ug== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@amazon.com header.s=amazon201209 header.b=XHnLqpNt; spf=pass (google.com: domain of prvs=552c78f9e=karahmed@amazon.de designates 207.171.190.10 as permitted sender) smtp.mailfrom=prvs=552c78f9e=karahmed@amazon.de; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=amazon.com Authentication-Results: mx.google.com; dkim=pass header.i=@amazon.com header.s=amazon201209 header.b=XHnLqpNt; spf=pass (google.com: domain of prvs=552c78f9e=karahmed@amazon.de designates 207.171.190.10 as permitted sender) smtp.mailfrom=prvs=552c78f9e=karahmed@amazon.de; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=amazon.com X-IronPort-AV: E=Sophos;i="5.46,392,1511827200"; d="scan'208";a="716536975" Subject: Re: [PATCH v2 5/8] x86/speculation: Add basic support for IBPB To: Borislav Petkov , David Woodhouse CC: , , , , , , , , , , References: <1516528149-9370-1-git-send-email-dwmw@amazon.co.uk> <1516528149-9370-6-git-send-email-dwmw@amazon.co.uk> <20180121180621.ufmc5m7nr6v4tjvc@pd.tnic> From: KarimAllah Ahmed Message-ID: <31c52131-5f7a-8af0-3092-5fc9e322a734@amazon.com> Date: Sun, 21 Jan 2018 19:29:43 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0 MIME-Version: 1.0 In-Reply-To: <20180121180621.ufmc5m7nr6v4tjvc@pd.tnic> Content-Language: en-US X-Originating-IP: [10.43.161.47] X-ClientProxiedBy: EX13D23UWA004.ant.amazon.com (10.43.160.72) To EX13D01EUB003.ant.amazon.com (10.43.166.248) Content-Type: text/plain; charset="utf-8"; format="flowed" Content-Transfer-Encoding: base64 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1590195048808685762?= X-GMAIL-MSGID: =?utf-8?q?1590227797375189597?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: T24gMDEvMjEvMjAxOCAwNzowNiBQTSwgQm9yaXNsYXYgUGV0a292IHdyb3RlOgoKPiBPbiBTdW4s IEphbiAyMSwgMjAxOCBhdCAwOTo0OTowNkFNICswMDAwLCBEYXZpZCBXb29kaG91c2Ugd3JvdGU6 Cj4+IEZyb206IFRob21hcyBHbGVpeG5lciA8dGdseEBsaW51dHJvbml4LmRlPgo+Pgo+PiBFeHBv c2UgaW5kaXJlY3RfYnJhbmNoX3ByZWRpY3Rpb25fYmFycmllcigpIGZvciB1c2UgaW4gc3Vic2Vx dWVudCBwYXRjaGVzLgo+Pgo+PiBba2FyYWhtZWQ6IHJlbW92ZSB0aGUgc3BlY2lhbC1jYXNpbmcg b2Ygc2t5bGFrZSBmb3IgdXNpbmcgSUJQQiAod3RmPyksCj4+ICAgICAgICAgICAgIHN3aXRjaCB0 byB1c2luZyBBTFRFUk5BVElWRVMgaW5zdGVhZCBvZiBzdGF0aWNfY3B1X2hhc10KPj4gW2R3bXcy OiAgICBzZXQgdXAgYXgvY3gvZHggaW4gdGhlIGFzbSB0b28gc28gaXQgZ2V0cyBOT1AnZCBvdXRd Cj4+Cj4+IFNpZ25lZC1vZmYtYnk6IFRob21hcyBHbGVpeG5lciA8dGdseEBsaW51dHJvbml4LmRl Pgo+PiBTaWduZWQtb2ZmLWJ5OiBLYXJpbUFsbGFoIEFobWVkIDxrYXJhaG1lZEBhbWF6b24uZGU+ Cj4+IFNpZ25lZC1vZmYtYnk6IERhdmlkIFdvb2Rob3VzZSA8ZHdtd0BhbWF6b24uY28udWs+Cj4+ IC0tLQo+PiAgIGFyY2gveDg2L2luY2x1ZGUvYXNtL2NwdWZlYXR1cmVzLmggICB8ICAxICsKPj4g ICBhcmNoL3g4Ni9pbmNsdWRlL2FzbS9ub3NwZWMtYnJhbmNoLmggfCAxNiArKysrKysrKysrKysr KysrCj4+ICAgYXJjaC94ODYva2VybmVsL2NwdS9idWdzLmMgICAgICAgICAgIHwgIDcgKysrKysr Kwo+PiAgIDMgZmlsZXMgY2hhbmdlZCwgMjQgaW5zZXJ0aW9ucygrKQo+Pgo+PiBkaWZmIC0tZ2l0 IGEvYXJjaC94ODYvaW5jbHVkZS9hc20vY3B1ZmVhdHVyZXMuaCBiL2FyY2gveDg2L2luY2x1ZGUv YXNtL2NwdWZlYXR1cmVzLmgKPj4gaW5kZXggOGM5ZTVjMC4uY2YyODM5OSAxMDA2NDQKPj4gLS0t IGEvYXJjaC94ODYvaW5jbHVkZS9hc20vY3B1ZmVhdHVyZXMuaAo+PiArKysgYi9hcmNoL3g4Ni9p bmNsdWRlL2FzbS9jcHVmZWF0dXJlcy5oCj4+IEBAIC0yMDcsNiArMjA3LDcgQEAKPj4gICAjZGVm aW5lIFg4Nl9GRUFUVVJFX1JFVFBPTElORV9BTUQJKCA3KjMyKzEzKSAvKiBBTUQgUmV0cG9saW5l IG1pdGlnYXRpb24gZm9yIFNwZWN0cmUgdmFyaWFudCAyICovCj4+ICAgI2RlZmluZSBYODZfRkVB VFVSRV9JTlRFTF9QUElOCQkoIDcqMzIrMTQpIC8qIEludGVsIFByb2Nlc3NvciBJbnZlbnRvcnkg TnVtYmVyICovCj4+ICAgCj4+ICsjZGVmaW5lIFg4Nl9GRUFUVVJFX0lCUEIJCSggNyozMisxNikg LyogVXNpbmcgSW5kaXJlY3QgQnJhbmNoIFByZWRpY3Rpb24gQmFycmllciAqLwo+IFJpZ2h0LCBh bmQgYXMgQU1EIGhhcyBhIHNlcGFyYXRlIGJpdCBmb3IgdGhpcyBpbiBDUFVJRF84MDAwMDAwOF9F QlhbMTJdLAo+IHdlIHByb2JhYmx5IGRvbid0IHJlYWxseSBuZWVkIHRoZSBzeW50aGV0aWMgYml0 IGhlcmUgYnV0IHNpbXBseSB1c2UgdGhlCj4gb25lIGF0ICgxMyozMisxMikgLSB3b3JkIDEzLgo+ Cj4+ICAgI2RlZmluZSBYODZfRkVBVFVSRV9BTURfUFJFRF9DTUQJKCA3KjMyKzE3KSAvKiBQcmVk aWN0aW9uIENvbW1hbmQgTVNSIChBTUQpICovCj4+ICAgI2RlZmluZSBYODZfRkVBVFVSRV9NQkEJ CQkoIDcqMzIrMTgpIC8qIE1lbW9yeSBCYW5kd2lkdGggQWxsb2NhdGlvbiAqLwo+PiAgICNkZWZp bmUgWDg2X0ZFQVRVUkVfUlNCX0NUWFNXCQkoIDcqMzIrMTkpIC8qIEZpbGwgUlNCIG9uIGNvbnRl eHQgc3dpdGNoZXMgKi8KPj4gZGlmZiAtLWdpdCBhL2FyY2gveDg2L2luY2x1ZGUvYXNtL25vc3Bl Yy1icmFuY2guaCBiL2FyY2gveDg2L2luY2x1ZGUvYXNtL25vc3BlYy1icmFuY2guaAo+PiBpbmRl eCA0YWQ0MTA4Li5jMzMzYzk1IDEwMDY0NAo+PiAtLS0gYS9hcmNoL3g4Ni9pbmNsdWRlL2FzbS9u b3NwZWMtYnJhbmNoLmgKPj4gKysrIGIvYXJjaC94ODYvaW5jbHVkZS9hc20vbm9zcGVjLWJyYW5j aC5oCj4+IEBAIC0yMTgsNSArMjE4LDIxIEBAIHN0YXRpYyBpbmxpbmUgdm9pZCB2bWV4aXRfZmls bF9SU0Iodm9pZCkKPj4gICAjZW5kaWYKPj4gICB9Cj4+ICAgCj4+ICtzdGF0aWMgaW5saW5lIHZv aWQgaW5kaXJlY3RfYnJhbmNoX3ByZWRpY3Rpb25fYmFycmllcih2b2lkKQo+IEkgbGlrZSBpYnBf YmFycmllcigpIGJldHRlci4KPgo+PiArewo+PiArCXVuc2lnbmVkIGxvbmcgYXgsIGN4LCBkeDsK Pj4gKwo+PiArCWFzbSB2b2xhdGlsZShBTFRFUk5BVElWRSgiIiwKPj4gKwkJCQkgIm1vdmwgJVtt c3JdLCAlJWVjeFxuXHQiCj4+ICsJCQkJICJtb3ZsICVbdmFsXSwgJSVlYXhcblx0Igo+PiArCQkJ CSAibW92bCAkMCwgJSVlZHhcblx0Igo+PiArCQkJCSAid3Jtc3IiLAo+PiArCQkJCSBYODZfRkVB VFVSRV9JQlBCKQo+PiArCQkgICAgIDogIj1hIiAoYXgpLCAiPWMiIChjeCksICI9ZCIgKGR4KQo+ PiArCQkgICAgIDogW21zcl0gImkiIChNU1JfSUEzMl9QUkVEX0NNRCksCj4+ICsJCSAgICAgICBb dmFsXSAiaSIgKFBSRURfQ01EX0lCUEIpCj4+ICsJCSAgICAgOiAibWVtb3J5Iik7Cj4+ICt9Cj4g QnR3LCB3ZSBjYW4gc2ltcGxpZnkgdGhpcyBhIGJpdCBieSBkcm9wcGluZyB0aGUgaW5wdXRzIGFu ZCBtYXJraW5nIHRoZSAzCj4gR1BScyBhcyBjbG9iYmVyZWQ6Cj4KPiAgICAgICAgICBhbHRlcm5h dGl2ZV9pbnB1dCgiIiwKPiAgICAgICAgICAgICAgICAgICAgICAgICAgICAibW92ICQweDQ5LCAl JWVjeFxuXHQiCj4gICAgICAgICAgICAgICAgICAgICAgICAgICAgIm1vdiAkMSwgJSVlYXhcblx0 Igo+ICAgICAgICAgICAgICAgICAgICAgICAgICAgICJ4b3IgJSVlZHgsICUlZWR4XG5cdCIKPiAg ICAgICAgICAgICAgICAgICAgICAgICAgICAid3Jtc3Jcblx0IiwKPiAgICAgICAgICAgICAgICAg ICAgICAgICAgICBYODZfRkVBVFVSRV9JQlBCLAo+ICAgICAgICAgICAgICAgICAgICAgICAgICAg IEFTTV9OT19JTlBVVF9DTE9CQkVSKCJlYXgiLCAiZWN4IiwgImVkeCIsICJtZW1vcnkiKSk7Cj4K Pgo+IFRoZSAibWVtb3J5IiBjbG9iYmVyIGlzIHByb2JhYmx5IG5vdCByZWFsbHkgbmVlZGVkIGJ1 dCBpdCB3b3VsZG4ndAo+IGh1cnQuLi4KPgo+IEFsc28sIGFib3ZlIHNheXM6Cj4KPj4gc3dpdGNo IHRvIHVzaW5nIEFMVEVSTkFUSVZFUyBpbnN0ZWFkIG9mIHN0YXRpY19jcHVfaGFzXQo+IFdoeT8K Pgo+IAlpZiAoc3RhdGljX2NwdV9oYXMoWDg2X0ZFQVRVUkVfSUJQQikpCj4gCQl3cm1zcihNU1Jf SUEzMl9QUkVEX0NNRCwgUFJFRF9DTURfSUJQQiwgMCk7Cj4KPiBJdCBjYW4ndCBnZXQgYW55IG1v cmUgcmVhZGFibGUgdGhhbiB0aGlzLiBXaHkgZXZlbiBmKmNrIHdpdGgKPiBhbHRlcm5hdGl2ZXM/ CgpCZWNhdXNlIHN0YXRpY19jcHVfaGFzIGlzIGFuIGluZGlyZWN0IGJyYW5jaCB3aGljaCB3aWxs IGNhdXNlIApzcGVjdWxhdGlvbiBhbmQKd2UgaGF2ZSB0byBhdm9pZCB0aGF0LgoKRGF2aWQgdG9s ZCBtZSB0aGF0IFBldGVyIHdhcyB3b3JraW5nIG9uIGEgZml4IGZvciBzdGF0aWNfY3B1X2hhcyB0 byAKYXZvaWQgdGhlCnNwZWN1bGF0aW9uIGJ1dCBJIGRvIG5vdCBrbm93IHdoYXQgaXMgdGhlIHN0 YXR1cyBvZiB0aGlzLgoKPgo+PiArCj4+ICAgI2VuZGlmIC8qIF9fQVNTRU1CTFlfXyAqLwo+PiAg ICNlbmRpZiAvKiBfX05PU1BFQ19CUkFOQ0hfSF9fICovCj4+IGRpZmYgLS1naXQgYS9hcmNoL3g4 Ni9rZXJuZWwvY3B1L2J1Z3MuYyBiL2FyY2gveDg2L2tlcm5lbC9jcHUvYnVncy5jCj4+IGluZGV4 IDM5MGIzZGMuLjk2NTQ4ZmYgMTAwNjQ0Cj4+IC0tLSBhL2FyY2gveDg2L2tlcm5lbC9jcHUvYnVn cy5jCj4+ICsrKyBiL2FyY2gveDg2L2tlcm5lbC9jcHUvYnVncy5jCj4+IEBAIC0yNDksNiArMjQ5 LDEzIEBAIHN0YXRpYyB2b2lkIF9faW5pdCBzcGVjdHJlX3YyX3NlbGVjdF9taXRpZ2F0aW9uKHZv aWQpCj4+ICAgCQlzZXR1cF9mb3JjZV9jcHVfY2FwKFg4Nl9GRUFUVVJFX1JTQl9DVFhTVyk7Cj4+ ICAgCQlwcl9pbmZvKCJGaWxsaW5nIFJTQiBvbiBjb250ZXh0IHN3aXRjaFxuIik7Cj4+ICAgCX0K Pj4gKwo+PiArCS8qIEluaXRpYWxpemUgSW5kaXJlY3QgQnJhbmNoIFByZWRpY3Rpb24gQmFycmll ciBpZiBzdXBwb3J0ZWQgKi8KPj4gKwlpZiAoYm9vdF9jcHVfaGFzKFg4Nl9GRUFUVVJFX1NQRUNf Q1RSTCkgfHwKPj4gKwkgICAgYm9vdF9jcHVfaGFzKFg4Nl9GRUFUVVJFX0FNRF9QUkVEX0NNRCkp IHsKPj4gKwkJc2V0dXBfZm9yY2VfY3B1X2NhcChYODZfRkVBVFVSRV9JQlBCKTsKPj4gKwkJcHJf aW5mbygiRW5hYmxpbmcgSW5kaXJlY3QgQnJhbmNoIFByZWRpY3Rpb24gQmFycmllclxuIik7Cj4g V2UgZG9uJ3QgcmVhbGx5IG5lZWQgdGhlIHByX2luZm8gYXMgImlicGIiIHdpbGwgYXBwZWFyIGlu IC9wcm9jL2NwdWluZm8uCj4KCkFtYXpvbiBEZXZlbG9wbWVudCBDZW50ZXIgR2VybWFueSBHbWJI CkJlcmxpbiAtIERyZXNkZW4gLSBBYWNoZW4KbWFpbiBvZmZpY2U6IEtyYXVzZW5zdHIuIDM4LCAx MDExNyBCZXJsaW4KR2VzY2hhZWZ0c2Z1ZWhyZXI6IERyLiBSYWxmIEhlcmJyaWNoLCBDaHJpc3Rp YW4gU2NobGFlZ2VyClVzdC1JRDogREUyODkyMzc4NzkKRWluZ2V0cmFnZW4gYW0gQW10c2dlcmlj aHQgQ2hhcmxvdHRlbmJ1cmcgSFJCIDE0OTE3MyBCCg==