From: "H. Peter Anvin" <hpa@zytor.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Xin Li <xin@zytor.com>, Borislav Petkov <bp@kernel.org>,
Xin Li <xin3.li@intel.com>, X86 ML <x86@kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86/cpufeatures: Correct LKGS feature flag description
Date: Wed, 15 Oct 2025 20:12:08 -0700 [thread overview]
Message-ID: <4CDD31CE-7040-4ADB-B3F1-E095E3C5BDF5@zytor.com> (raw)
In-Reply-To: <20251015154911.GCaO_Cd0XNyE8bi5Db@fat_crate.local>
On October 15, 2025 8:49:11 AM PDT, Borislav Petkov <bp@alien8.de> wrote:
>On Wed, Oct 15, 2025 at 08:44:55AM -0700, H. Peter Anvin wrote:
>> >> Except that that is also wrong, because that's not all of what the instruction does. "Load user space GS" is really what it does, despite the initiate historical naming.
>> >>
>> >
>> >Do you mean the load of GS attributes by LKGS is still missing?
>>
>> Yes. It's really a modified MOV GS,... instruction that loads the base, limit, selector, and attributes; it just loads the base into a different place.
>
>Ok, "Load user space GS base" it is. Considering how you can't load any other
>GS.base due to it GPing for CPL > 0.
>
No, "load user space GS." It loads everything, not just the base.
next prev parent reply other threads:[~2025-10-16 3:12 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-15 10:35 Borislav Petkov
2025-10-15 15:08 ` Xin Li
2025-10-15 15:18 ` H. Peter Anvin
2025-10-15 15:34 ` Xin Li
2025-10-15 15:36 ` H. Peter Anvin
2025-10-15 15:41 ` Xin Li
2025-10-15 15:44 ` H. Peter Anvin
2025-10-15 15:49 ` Borislav Petkov
2025-10-16 3:12 ` H. Peter Anvin [this message]
2025-10-16 12:41 ` Borislav Petkov
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