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Date:   Tue, 3 May 2022 12:43:17 +0200
From:   Borislav Petkov <bp@alien8.de>
To:     Juergen Gross <jgross@suse.com>
Cc:     Lai Jiangshan <jiangshanlai@gmail.com>,
        linux-kernel@vger.kernel.org,
        Peter Zijlstra <peterz@infradead.org>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Andy Lutomirski <luto@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>, x86@kernel.org,
        Lai Jiangshan <jiangshan.ljs@antgroup.com>,
        Ingo Molnar <mingo@redhat.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        "Kirill A. Shutemov" <kirill@shutemov.name>
Subject: Re: [PATCH V6 6/8] x86/entry: Convert SWAPGS to swapgs and remove
 the definition of SWAPGS
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On Mon, May 02, 2022 at 07:56:16PM +0200, Borislav Petkov wrote:
> Ok, simpler asm, cool, let's do it then.

Yeah, just tried it, it needs more ifdeffery:

ld: arch/x86/entry/entry_64.o:/home/boris/kernel/linux/arch/x86/entry/entry_64.S:129: undefined reference to `xenpv_restore_regs_and_return_to_usermode'
ld: arch/x86/entry/entry_64_compat.o:(.altinstr_replacement+0x1): undefined reference to `xenpv_restore_regs_and_return_to_usermode'
make: *** [Makefile:1158: vmlinux] Error 1

Oh well.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette