linux-kernel - Re: [PATCHv2 16/29] x86/boot: Add a trampoline for booting APs via firmware handoff

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Yf0vB+TBR2AjHmV5@zn.tnic>
Date:   Fri, 4 Feb 2022 14:49:59 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        tglx@...utronix.de, mingo@...hat.com, dave.hansen@...el.com,
        luto@...nel.org, peterz@...radead.org, aarcange@...hat.com,
        ak@...ux.intel.com, dan.j.williams@...el.com, david@...hat.com,
        hpa@...or.com, jgross@...e.com, jmattson@...gle.com,
        joro@...tes.org, jpoimboe@...hat.com, knsathya@...nel.org,
        pbonzini@...hat.com, sdeep@...are.com, seanjc@...gle.com,
        tony.luck@...el.com, vkuznets@...hat.com, wanpengli@...cent.com,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        Kai Huang <kai.huang@...el.com>
Subject: Re: [PATCHv2 16/29] x86/boot: Add a trampoline for booting APs via
 firmware handoff

On Fri, Feb 04, 2022 at 03:27:19AM -0800, Kuppuswamy, Sathyanarayanan wrote:
> trampoline_start and sev_es_trampoline_start are not mutually exclusive.
> Both are
> used in arch/x86/kernel/sev.c.

I know - I've asked Jörg to have a look here.

> But trampoline_start64 can be removed and replaced with trampoline_start.
> But using
> _*64 suffix makes it clear that is used for 64 bit(CONFIG_X86_64).
> 
> Adding it for clarity seems to be fine to me.

Does it matter if the start IP is the same for all APs? Or do will there
be a case where you have some APs starting from the 32-bit trampoline
and some from the 64-bit one, on the same system? (that would be weird
but what do I know...)

-- 
Regards/Gruss,
    Boris.

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