RE: RSB Alternative bit in IA32_ARCH_CAPABILITIES Was:Re: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs

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Subject: RE: RSB Alternative bit in IA32_ARCH_CAPABILITIES Was:Re: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs
From: "Van De Ven, Arjan" <arjan.van.de.ven@xxxxxxxxx>
Date: Fri, 23 Feb 2018 18:18:52 +0000
Accept-language: en-US
Cc: "valdis.kletnieks@xxxxxx" <valdis.kletnieks@xxxxxx>, Jon Masters <jcm@xxxxxxxxxxxxxx>, David Woodhouse <dwmw2@xxxxxxxxxxxxx>, "tglx@xxxxxxxxxxxxx" <tglx@xxxxxxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, "kvm@xxxxxxxxxxxxxxx" <kvm@xxxxxxxxxxxxxxx>, "torvalds@xxxxxxxxxxxxxxxxxxxx" <torvalds@xxxxxxxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "Hansen, Dave" <dave.hansen@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>
Dlp-product: dlpe-windows
Dlp-reaction: no-action
Dlp-version: 11.0.0.116
In-reply-to: <20180223181237.GA19321@char.us.oracle.com>
References: <1518776517.7876.21.camel@infradead.org> <d61edc94-8a51-62bd-65ed-8068451ca5b5@redhat.com> <1518783021.7876.34.camel@infradead.org> <4882860e-23c5-75b3-ac02-c700f615156e@jonmasters.org> <0575AF4FD06DD142AD198903C74E1CC87A61923C@ORSMSX103.amr.corp.intel.com> <10373.1519084385@turing-police.cc.vt.edu> <0575AF4FD06DD142AD198903C74E1CC87A619255@ORSMSX103.amr.corp.intel.com> <aa3fbaf1-0efc-64b1-4f7b-3d00b0493d48@redhat.com> <0575AF4FD06DD142AD198903C74E1CC87A619465@ORSMSX103.amr.corp.intel.com> <2159cdc0-c30d-3bf8-1c25-74bff46a1e91@redhat.com> <20180223181237.GA19321@char.us.oracle.com>

> To add a bit more to this, Intel just updated their
> IA32_ARCH_CAPABILITIES_MSR
> to have a new bit to sample to figure out whether you need IBRS or not
> during runtime.

actually we updated the document when you need RSB stuffing.
based on the request of various folks here on LKML.

References:
- Re: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs
  - From: David Woodhouse
- Re: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs
  - From: Paolo Bonzini
- Re: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs
  - From: David Woodhouse
- Re: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs
  - From: Jon Masters
- RE: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs
  - From: Van De Ven, Arjan
- Re: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs
  - From: valdis . kletnieks
- RE: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs
  - From: Van De Ven, Arjan
- Re: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs
  - From: Paolo Bonzini
- RE: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs
  - From: Van De Ven, Arjan
- Re: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs
  - From: Paolo Bonzini
- Is: RSB Alternative bit in IA32_ARCH_CAPABILITIES Was:Re: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs
  - From: Konrad Rzeszutek Wilk

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