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Date: Tue, 25 Aug 2020 12:44:29 +0200 From: Thomas Gleixner <tglx@...utronix.de> To: Brian Gerst <brgerst@...il.com>, Sean Christopherson <sean.j.christopherson@...el.com> Cc: Paolo Bonzini <pbonzini@...hat.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, kvm list <kvm@...r.kernel.org>, the arch/x86 maintainers <x86@...nel.org>, Dave Hansen <dave.hansen@...el.com>, Chang Seok Bae <chang.seok.bae@...el.com>, Peter Zijlstra <peterz@...radead.org>, Sasha Levin <sashal@...nel.org>, Tom Lendacky <thomas.lendacky@....com>, Andy Lutomirski <luto@...nel.org> Subject: Re: [PATCH v2] x86/entry/64: Do not use RDPID in paranoid entry to accomodate KVM On Fri, Aug 21 2020 at 11:35, Brian Gerst wrote: > On Fri, Aug 21, 2020 at 10:22 AM Sean Christopherson >> > .macro GET_PERCPU_BASE reg:req >> > - ALTERNATIVE \ >> > - "LOAD_CPU_AND_NODE_SEG_LIMIT \reg", \ >> > - "RDPID \reg", \ >> >> This was the only user of the RDPID macro, I assume we want to yank that out >> as well? > > No. That one should be kept until the minimum binutils version is > raised to one that supports the RDPID opcode. The macro is unused and nothing in the kernel can use RDPID as we just established. Thanks, tglx
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