From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 693091917D9 for ; Wed, 18 Dec 2024 09:44:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734515092; cv=none; b=ivIz8HMYlx1p0e2/whRRnB5gOZp9BiaZx3VUGnS37ezBH01zk7TwGJi8usc1MLIg2uFgqMKPrFHWG4fltEc7LkrHUrqRmr7OnuyzjQuw9teb/G15f5vZjCuFTygufs650TAtnPo4po1djlLkDXeke4/fyvO+oaRJjQA3X56ByEU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734515092; c=relaxed/simple; bh=q2cn2XhDFN+27Y509d2giKWbfaU3J1rYDmu/iHSFz3Q=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=ldzTexuA0uJJa30oLS2wc+664D/vgtQW5UhpNjxlL/VvRwUxDk5GsZMvMwRrQkxfz0L5XbNP/+pwwPYQoLDtqz76EGiwkNRr0wEzwZ6nSFiB53iY/8Gn2YTS0zqY0kjxtfTkc515M3uKTZfczNeMfwbEEeNE/k+juy0r2pLSc8M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=r46tY5Po; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="r46tY5Po" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=q2cn2XhDFN+27Y509d2giKWbfaU3J1rYDmu/iHSFz3Q=; b=r46tY5PoTf+gNo3+RXQhMD7BEm KG/Bjt18nvVDhZ9JN9U92hA2rIywFkSm3eCfePfAEduGVZRmUxHazKk9j0f2gjn29DXF+d9qMXWZa 1k8W5NR322GaUaHJ/W8vlZzxuB3gjrvvF1ZIUt1+Xww96w0pXF9cpu6XT8D0V5Ju0wXJGS9Tk4LXF Snuz7kUeu9JrvhlZCdpsiclwsu0R4gwKwOFHDqgNWwbBBE2jRdJHCrXzfi4R2H0AgsvnDT9k5+I99 eJtb8NbvYtfV67z7CyI3eSs5avOc6MtfR9nvoC61f9Lr/89TTDAAgTXdgCrYBrXMN+KDA34dPMA8o hSq8/VrA==; Received: from [89.27.170.32] (helo=u09cd745991455d.theinstantgroup) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tNqbS-0000000AaTa-2aAj; Wed, 18 Dec 2024 09:44:26 +0000 Message-ID: <5857ef047402c3ded29d4c024f8fdc32608f1696.camel@infradead.org> Subject: Re: [PATCH v5 07/20] x86/kexec: Invoke copy of relocate_kernel() instead of the original From: David Woodhouse To: Josh Poimboeuf Cc: Nathan Chancellor , kexec@lists.infradead.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , "Kirill A. Shutemov" , Kai Huang , Nikolay Borisov , linux-kernel@vger.kernel.org, Simon Horman , Dave Young , Peter Zijlstra , bsz@amazon.de Date: Wed, 18 Dec 2024 10:44:25 +0100 In-Reply-To: <20241218090305.y4o62pmdwq32732h@jpoimboe> References: <20241205153343.3275139-1-dwmw2@infradead.org> <20241205153343.3275139-8-dwmw2@infradead.org> <20241214230818.GA677337@ax162> <24d843d2ceb09acdae494ee9a17ec94bf8bb4e4f.camel@infradead.org> <20241216054942.GA25019@ax162> <79ea9c10ae4f1dae16be8c05bb7b7e6b72512f10.camel@infradead.org> <9ee61d2b89b4cecd10ece64002bf2c06648e1de7.camel@infradead.org> <20241218090305.y4o62pmdwq32732h@jpoimboe> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-swPoJv5JGO0yUarj+glS" User-Agent: Evolution 3.52.3-0ubuntu1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-swPoJv5JGO0yUarj+glS Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2024-12-18 at 01:03 -0800, Josh Poimboeuf wrote: > On Tue, Dec 17, 2024 at 01:03:07PM +0100, David Woodhouse wrote: > > I've dropped this for now and just posted the __nocfi thing as the > > regression fix. I think we *should* provide the CFI information in > > relocate_kernel_64.S though, so I've left these commits in my tree at > > https://git.infradead.org/?p=3Dusers/dwmw2/linux.git;a=3Dshortlog;h=3Dr= efs/heads/kexec-debug > >=20 > > I'd really appreciate some help in getting objtool to stop whining > > about them, for *both* Clang and GCC builds at the same time :) >=20 > Hm, I can't fetch for some reason: >=20 > =C2=A0 $ git fetch https://git.infradead.org/users/dwmw2/linux.git=C2=A0k= exec-debug > =C2=A0 fatal: https://git.infradead.org/users/dwmw2/linux.git/info/refs= =C2=A0not valid: could not determine hash algorithm; is this a git reposito= ry? >=20 The https URL is just gitweb. You can fetch from=20 git://git.infradead.org/users/dwmw2/linux.git > At some point we had discussed placing the code in .rodata, was it the > alternative preventing that? No, the alternative seems to be fine, and it's all in the .data section now (since the kernel does write some variables there which are then accessed %rip-relative from the code itself). The problem is when I use SYM_TYPED_FUNC_START for relocate_kernel itself, objtool starts to whine that the first instruction of relocate_kernel is unreachable (presumably) because it is never jumped to directly, but copied into the control page and then called via a calculated function pointer). There's also an objtool warning about loading the stack pointer. I seem to get different warnings from objtool for Clang and GCC builds, and can't find a set of hints which will make them both shut up at the same time. --=-swPoJv5JGO0yUarj+glS Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC 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