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[209.132.180.67]) by mx.google.com with ESMTP id q17si115883pgv.144.2018.02.16.10.58.34; Fri, 16 Feb 2018 10:58:48 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=twosheds.20170209 header.b=kycS1WGD; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933443AbeBPKWG (ORCPT + 99 others); Fri, 16 Feb 2018 05:22:06 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:59958 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933129AbeBPKWE (ORCPT ); Fri, 16 Feb 2018 05:22:04 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=twosheds.20170209; h=Mime-Version:Date:Content-Type: References:In-Reply-To:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=X3o4454WqxXoka0/xbig0Xq4/xrs+glmju9ybUQVWX4=; b=kycS1WGDGmOq1oGC/fPdRou4z qAleC5wjuKE4J41B6ocQ+0gjPGXI0Iki7CFeu7UUsPbyiuM2vF5proIh+bfEvyOC6DYdoiDCwFN/7 u/GbHltaWiwIlZF5PVy0LVdj6aJNTcHRMjnC83sfp0HD+lSXwA/paFMgh/keSFZyuuww9CYlLb0Cz DfuZSrszs5VgaBm+UIkmsKggf36WIvuXoPrhqH0ujAtqt+IQwmVzblOyvgzNT5lrfZeTC2f2Yyv8X 4gnDve2Jve85rSFYFAprezijm6qSPS/CsUAHpMJ18hZn3eNAYeksKuSrrDnvDUaVYzv1Y0E5c/Hek TSkaZLxTw==; Received: from [2001:8b0:10b:1:b4af:3c73:9a1f:a189] by twosheds.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1emd9R-0003Uj-SP; Fri, 16 Feb 2018 10:21:57 +0000 Message-ID: <1518776517.7876.21.camel@infradead.org> Subject: Re: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs From: David Woodhouse To: Paolo Bonzini , tglx@linutronix.de, x86@kernel.org, kvm@vger.kernel.org, torvalds@linux-foundation.org, linux-kernel@vger.kernel.org, arjan.van.de.ven@intel.com, dave.hansen@intel.com Cc: Ingo Molnar In-Reply-To: <75287047-77a0-e0ff-c2e8-61c81641251e@redhat.com> References: <1518449255-2182-1-git-send-email-dwmw@amazon.co.uk> <1518449255-2182-2-git-send-email-dwmw@amazon.co.uk> <7e2e5ad1-49b6-1fdb-4a62-8ad6aefc30a0@redhat.com> <1518509708.12890.33.camel@infradead.org> <27c85759-e662-d281-f8a0-0a80ca8ee18f@redhat.com> <1518517262.12890.43.camel@infradead.org> <1518518198.12890.48.camel@infradead.org> <02bd3fdd-1b73-6cab-fb09-38ba933396bd@redhat.com> <1518775136.7876.13.camel@infradead.org> <75287047-77a0-e0ff-c2e8-61c81641251e@redhat.com> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-seH4U/D0+sLu2Ztwybzr" Date: Fri, 16 Feb 2018 10:21:57 +0000 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-seH4U/D0+sLu2Ztwybzr Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2018-02-16 at 11:08 +0100, Paolo Bonzini wrote: > On 16/02/2018 10:58, David Woodhouse wrote: > >=20 > > On Tue, 2018-02-13 at 11:41 +0100, Paolo Bonzini wrote: > >=20 > > >=20 > > > On 13/02/2018 11:36, David Woodhouse wrote: > > > >=20 > > > > >=20 > > > > > >=20 > > > > > > - if the VM has IBRS_ALL, pass through the MSR when it is zero = and > > > > > > intercept writes when it is one (no writes should happen) > > > > > > =C2=A0 > > > > > > - if the VM doesn't have IBRS_ALL, do as we are doing now, inde= pendent > > > > > > of what the host spectre_v2_ibrs_all() setting is. > > > > > We end up having to turn IBRS on again on vmexit then, taking car= e that > > > > > no conditional branch can go round it. So that becomes an > > > > > *unconditional* wrmsr or lfence in the vmexit path. We really don= 't > > > > > want that. > > > > >=20 > > > > Note that being able to keep it simple in KVM was basically what ma= de > > > > the difference between me tolerating IBRS_ALL as Intel currently de= fine > > > > it, and throwing my toys out of the pram (as I had done in the firs= t > > > > iterations of this patch). > > > =C2=A0 > > > You have my vote. :) > >=20 > > I was taking that as assent to the patch... could I trouble you for an > > explicit ack, please? > > No, it's a vote for throwing the toys out of the pram (or running away > with the ball, if you prefer). >=20 > Unfortunately, if you want to have a higher-performance mode for > IBRS_ALL that avoids rdmsr on vmexit, you have to do it as sketched above= . Why? With IBRS_ALL the guest *never* gets to affect the actual hardware MSR, which is always on. The MSR is purely an emulated no-op. Why does that affect migration? Even if the guest doesn't have/support IBRS_ALL, and is frobbing the (now emulated) MSR on every kernel entry/exit, that's *still* going to be a metric shitload faster than what it *thought* it was doing. --=-seH4U/D0+sLu2Ztwybzr Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEFQw ggUxMIIEGaADAgECAhBNRhEyk/HZ7naOeTHWrzuAMA0GCSqGSIb3DQEBCwUAMIGXMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYD VQQKExFDT01PRE8gQ0EgTGltaXRlZDE9MDsGA1UEAxM0Q09NT0RPIFJTQSBDbGllbnQgQXV0aGVu dGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTAeFw0xNzEyMjEwMDAwMDBaFw0xODEyMjEyMzU5 NTlaMCQxIjAgBgkqhkiG9w0BCQEWE2R3bXcyQGluZnJhZGVhZC5vcmcwggEiMA0GCSqGSIb3DQEB AQUAA4IBDwAwggEKAoIBAQDgzLNWa18DNpGUj/ZeH0Sgz53ESIbzdPw3OJeuNP6jZhxZojbyfxbM hETscxI/Hj6UZ4a7sHm5BkVjlsB1Af2Za/PXUt8MmLAcPMHkMPGunvkUibEvblDvpqMkQZlaZM+t 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