From: Thomas Gleixner <tglx@linutronix.de>
To: Brian Gerst <brgerst@gmail.com>,
Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
kvm list <kvm@vger.kernel.org>,
the arch/x86 maintainers <x86@kernel.org>,
Dave Hansen <dave.hansen@intel.com>,
Chang Seok Bae <chang.seok.bae@intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Sasha Levin <sashal@kernel.org>,
Tom Lendacky <thomas.lendacky@amd.com>,
Andy Lutomirski <luto@kernel.org>
Subject: Re: [PATCH v2] x86/entry/64: Do not use RDPID in paranoid entry to accomodate KVM
Date: Tue, 25 Aug 2020 12:44:29 +0200 [thread overview]
Message-ID: <874kor57jm.fsf@nanos.tec.linutronix.de> (raw)
In-Reply-To: <CAMzpN2h79bi5dd7PxjY45xYy71UdYomKa1t2gNxLtRpDkMs+Lw@mail.gmail.com>
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
next prev parent reply other threads:[~2020-08-25 10:44 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-21 10:52 [PATCH v2] x86/entry/64: Do not use RDPID in paranoid entry to accomodate KVM Paolo Bonzini
2020-08-21 14:15 ` Brian Gerst
2020-08-21 14:21 ` [tip: x86/urgent] " tip-bot2 for Sean Christopherson
2020-08-21 14:21 ` [PATCH v2] " Sean Christopherson
2020-08-21 15:35 ` Brian Gerst
2020-08-25 10:44 ` Thomas Gleixner [this message]
2020-08-25 12:11 ` Brian Gerst
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