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Date:   Thu, 20 May 2021 18:38:58 +0100
From:   Matthew Wilcox <willy@infradead.org>
To:     "Yu, Yu-cheng" <yu-cheng.yu@intel.com>
Cc:     Borislav Petkov <bp@alien8.de>, x86@kernel.org,
        "H. Peter Anvin" <hpa@zytor.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, linux-kernel@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-mm@kvack.org,
        linux-arch@vger.kernel.org, linux-api@vger.kernel.org,
        Arnd Bergmann <arnd@arndb.de>,
        Andy Lutomirski <luto@kernel.org>,
        Balbir Singh <bsingharora@gmail.com>,
        Cyrill Gorcunov <gorcunov@gmail.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Eugene Syromiatnikov <esyr@redhat.com>,
        Florian Weimer <fweimer@redhat.com>,
        "H.J. Lu" <hjl.tools@gmail.com>, Jann Horn <jannh@google.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Kees Cook <keescook@chromium.org>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Nadav Amit <nadav.amit@gmail.com>,
        Oleg Nesterov <oleg@redhat.com>, Pavel Machek <pavel@ucw.cz>,
        Peter Zijlstra <peterz@infradead.org>,
        Randy Dunlap <rdunlap@infradead.org>,
        "Ravi V. Shankar" <ravi.v.shankar@intel.com>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@intel.com>,
        Dave Martin <Dave.Martin@arm.com>,
        Weijiang Yang <weijiang.yang@intel.com>,
        Pengfei Xu <pengfei.xu@intel.com>,
        Haitao Huang <haitao.huang@intel.com>,
        Mark Brown <broonie@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>
Subject: Re: [PATCH v26 26/30] ELF: Introduce arch_setup_elf_property()
Message-ID: <YKaesoXCSBmCwD+4@casper.infradead.org>
References: <20210427204315.24153-1-yu-cheng.yu@intel.com>
 <20210427204315.24153-27-yu-cheng.yu@intel.com>
 <YKVUgzJ0MVNBgjDd@zn.tnic>
 <c29348d8-caae-5226-d095-ae3992d88338@intel.com>
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In-Reply-To: <c29348d8-caae-5226-d095-ae3992d88338@intel.com>
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On Wed, May 19, 2021 at 03:14:58PM -0700, Yu, Yu-cheng wrote:
> > > +++ b/include/uapi/linux/elf.h
> > > @@ -455,4 +455,13 @@ typedef struct elf64_note {
> > >   /* Bits for GNU_PROPERTY_AARCH64_FEATURE_1_BTI */
> > >   #define GNU_PROPERTY_AARCH64_FEATURE_1_BTI	(1U << 0)
> > > +/* .note.gnu.property types for x86: */
> > > +#define GNU_PROPERTY_X86_FEATURE_1_AND		0xc0000002
> > 
> > Why not 0xc0000001? ARM64 is 0xc0000000...
> > 
> 
> I just looked at the ABI document.
> 
> ARM has GNU_PROPERTY_AARCH64_FEATURE_1_AND 0xc0000000
> 
> X86 has:
> 	GNU_PROPERTY_X86_ISA_1_USED	0xc0000000
> 	GNU_PROPERTY_X86_ISA_1_NEEDED	0xc0000001
> 	GNU_PROPERTY_X86_FEATURE_1_AND	0xc0000002

Please add all three, not just the last one.