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 C9B79221472 for ; Thu, 19 Dec 2024 10:03:18 +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=1734602601; cv=none; b=RR2H1v5ZEHzICeXGmSWh0ZlYDs+PIJRow1McNGM54H8PRbJRDFRDXNOCfBsmqDO2DXtmlCcldYpRbgzeJnEqMuNoWSM+voWBLLa865qnSES2C2q8m4bQHrmt1gSy9tcK/JXsXTbi9/3vgkuWHSlyyEHW1YFcRcObnBqj0tWvK7Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734602601; c=relaxed/simple; bh=8JIDYjBw0Xeqiv922W8LG9saa/O59zM2UGaKCEa5ak0=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=lGv5pGE0XxndeEU15cFPUjGTqd4vZFH4uZ8F7f8B6vMvghkmhOJvzUxjjbs+uu8Cukt9UjpRlkL+n7+NQVYTsH+3dJwfa0jI12aGvuZ06xLvpVhQ0bBBMLbsa99F0T0LS7jMx+YoU/vaRSqsyoR99/dpyvnAl7sBv6oTczjiaKg= 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=vuqeIAF8; 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="vuqeIAF8" 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=8JIDYjBw0Xeqiv922W8LG9saa/O59zM2UGaKCEa5ak0=; b=vuqeIAF8uDsah/Al/GS6YFx7vL koZkMtWkc1247QQdetE17N07joR7rMkboim7OgrCR2GA8IEjkiUYhZpFEbd7s4t9RntXccs8e908a m8Tv3naROA9B/GC0qzlZAMRyvX2aFPZSNceFAlqK8UYB7SXzVCac9JK2QYG3daaj2YQO3/x9ewFGV SbHY39ZvgnYrHRTtNd0unRHmnUJQ62KOpe5SRJe+mituKX18ayG3+GZZl7yEDnASSsQIFC7e1Jxms X4Fo59yvK/1vHPXmEgOWgGrVubHchvRKURPn7cb96BLOGpdFkBxUgOrfd4ejwRFa54ZxVUsmylRNZ +kkkJZ5g==; Received: from [54.239.6.185] (helo=freeip.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tODMt-00000002xo3-41AE; Thu, 19 Dec 2024 10:02:56 +0000 Message-ID: <7e7eda28bf697752435dc730d689cd3edf9bf013.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: Thu, 19 Dec 2024 11:02:55 +0100 In-Reply-To: <20241219002015.7y5ohlfofc6c3njr@jpoimboe> References: <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> <5857ef047402c3ded29d4c024f8fdc32608f1696.camel@infradead.org> <20241218212326.44qff3i5n6cxuu5d@jpoimboe> <20241219002015.7y5ohlfofc6c3njr@jpoimboe> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-ZkE8yuEqzwUGdb8gRn/Q" 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 --=-ZkE8yuEqzwUGdb8gRn/Q Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2024-12-18 at 16:20 -0800, Josh Poimboeuf wrote: > On Wed, Dec 18, 2024 at 11:27:27PM +0100, David Woodhouse wrote: > > On Wed, 2024-12-18 at 13:23 -0800, Josh Poimboeuf wrote: > > >=20 > > > The linker script does place it in .data, but objtool runs on the obj= ect > > > file before linking, where it's still in an executable section > > > (.text..relocate_kernel). > > >=20 > > > How about something like below? > > >=20 > > > =C2=A0 - move text to .data..relocate_kernel > > > =C2=A0 - remove objtool annotations > > > =C2=A0 - replace the alternative with a runtime check > >=20 > > That leaves me unable to use 'objdump -S > > arch/x86/kernel/relocate_kernel_64.o' so I hate it :) >=20 > Well, it's already written in assembly, there's not much benefit in > disassembling it ;-)=C2=A0 But you can still force gdb to do so with > something like "x/50i ". I've spent a lot of time recently wanting to know precisely which instruction it was that faulted (or that objtool is complaining about), so I *have* wanted to disassemble it. But yeah, in the general case that shouldn't be something we're doing all the time. Perhaps you're right, and we should just rip out all the annotations and move it to .data..relocate_kernel. But I'll give it a bit more effort to see if we can make objtool happy and keep the ALTERNATIVE working without having to do that manually... > Isn't that easier than putting in all these hacks to make objtool happy > (and continue to keep it happy over the coming years), when it doesn't > need to care about this code in the first place? Less worried about the 'continue' part. This code doesn't get much churn (not until I just came along and blitzed it, at least). > Anyway, what I think you're looking for is UNWIND_HINT_UNDEFINED.=C2=A0 I= n > fact all the unwind annotations in that file should be UNDEFINED since > the hints are all referring to the wrong addresses (because copied code) > and the ORC unwinder isn't reachable for most of that code anyway. >=20 > Also, it's fine to make relocate_kernel() a proper function with > SYM_FUNC_END, you'd just need to add the following line afterwards: >=20 > =C2=A0 STACK_FRAME_NON_STANDARD relocate_kernel >=20 Thanks, I'll take a look. The next thing objtool is actually complaining about is that relocate_kernel() itself is not reachable (since it's never invoked in its original location): vmlinux.o: warning: objtool: relocate_kernel+0x0: unreachable instruction I'm not sure why objtool has only just started whining about that with the very last patches at the top of my tree; it's been true ever since the commit which executes from the relocated copy. --=-ZkE8yuEqzwUGdb8gRn/Q Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG 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