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Date: Thu, 9 Nov 2017 11:51:08 +0100 (CET) From: Thomas Gleixner <tglx@...utronix.de> To: Borislav Petkov <bp@...en8.de> cc: Dave Hansen <dave.hansen@...ux.intel.com>, luto@...nel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, moritz.lipp@...k.tugraz.at, daniel.gruss@...k.tugraz.at, michael.schwarz@...k.tugraz.at, richard.fellner@...dent.tugraz.at, torvalds@...ux-foundation.org, keescook@...gle.com, hughd@...gle.com, x86@...nel.org Subject: Re: [PATCH 02/30] x86, tlb: make CR4-based TLB flushes more robust On Thu, 9 Nov 2017, Borislav Petkov wrote: > On Wed, Nov 08, 2017 at 11:46:49AM -0800, Dave Hansen wrote: > > + /* Put original CR4 value back: */ > > native_write_cr4(cr4); > > } > > Btw, Andy, we read the CR4 shadow in that function but we don't update > it. Why? Because its the same as before. > > + /* Put original CR4 value back: */ > > native_write_cr4(cr4); Thanks, tglx
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