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Date: Sat, 13 Jan 2018 13:52:24 +0000 From: "Van De Ven, Arjan" <arjan.van.de.ven@...el.com> To: Andy Lutomirski <luto@...nel.org>, "Hansen, Dave" <dave.hansen@...el.com> CC: "Raj, Ashok" <ashok.raj@...el.com>, LKML <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, Tim Chen <tim.c.chen@...ux.intel.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Greg KH <gregkh@...uxfoundation.org>, Andrea Arcangeli <aarcange@...hat.com>, "Andi Kleen" <ak@...ux.intel.com>, David Woodhouse <dwmw@...zon.co.uk>, "Peter Zijlstra" <peterz@...radead.org>, "Williams, Dan J" <dan.j.williams@...el.com>, Paolo Bonzini <pbonzini@...hat.com>, "Nakajima, Jun" <jun.nakajima@...el.com>, "Mallick, Asit K" <asit.k.mallick@...el.com> Subject: RE: [PATCH 1/5] x86/ibrs: Introduce native_rdmsrl, and native_wrmsrl > > We were also worried about the indirect calls that are part of the > > paravirt interfaces when retpolines are not in place. > > > > How could those possibly be any worse than any other indirect call in > the kernel? they're worse if they happen before you write the MSR that then protects them?
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