linux-kernel - Re: [PATCH 10/26] x86/tdx: Support TDX guest port I/O at decompression time

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Message-ID: <Yehz3eqq670WRVJE@zn.tnic>
Date:   Wed, 19 Jan 2022 21:26:05 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        mingo@...hat.com, dave.hansen@...el.com, luto@...nel.org,
        peterz@...radead.org, sathyanarayanan.kuppuswamy@...ux.intel.com,
        aarcange@...hat.com, ak@...ux.intel.com, dan.j.williams@...el.com,
        david@...hat.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
Subject: Re: [PATCH 10/26] x86/tdx: Support TDX guest port I/O at
 decompression time

On Wed, Jan 19, 2022 at 11:08:41PM +0300, Kirill A. Shutemov wrote:
> > Relocation section '.rela.data.rel.local' at offset 0x5c18 contains 6 entries:
			^^^^^^

> JFYI, the message comes from ASSERT in vmlinux.lds.S.

Yah, because those relocations are put in a .rela section and that one
matches.

And looking at which commit added it:

527afc212231 ("x86/boot: Check that there are no run-time relocations")

the removed comment kinda explains it - decompressor kernel cannot
handle runtime relocations. Obviously.

Now we need to figure out how to avoid those...

> I assume for now I can proceed with the assignment that works, right?
> It can be changed later once we figure out what is going on.

Right.

-- 
Regards/Gruss,
    Boris.

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