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 5B1901EB9E3 for ; Tue, 17 Dec 2024 12:03:21 +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=1734437002; cv=none; b=Grij9dOcN0MB0Y1wAex06Y+xIdQN3WA2P1Wo1DkPdAZDCGMA6LL8opeOUF94wjLOKPtv2bs9Ph6b2YGp0KUhZ1kS5ySGIKDUflpHPa0GBNVGJnj5MLGv0Qnd1+BVocB0lUcwi656+zf6jN1eEDpWK8WEJQ4hnSoBkevJf/TV29k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734437002; c=relaxed/simple; bh=sQmdF79eGPh4c95/oH5o1gGFe/lALsVFHzhP/juVxZc=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Y7vkDo6dsSMz3cYDpP0tefCuSWn71DtedMA5GtQQqt9zn0b+6jY7fDaDIby9MWNc9xDogldEoAm1UozudVcfZl1+4YERdIfVMEDjXuaLd8me3AdjddU+M2qaOOE5M+xoNFapBlOG/4O7Qa86Bwv/MaeRhgTtEyxrisaqo59NsAE= 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=SLErHUUf; 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="SLErHUUf" 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=sQmdF79eGPh4c95/oH5o1gGFe/lALsVFHzhP/juVxZc=; b=SLErHUUf3zQIKGhOviIeCgGRxS 6MBU6Uw3ZCXun8IctsraFpFQgOgD6GjrjEOtaFmofILvXmGD3SZBKdqzSemv36HqnmjbiQm9YrsHp ICrzqQwre19AZqdSjiSJ8qF1KuH5j2s357+oQ9A/bCccbjeUrhR/BitecUwSp/8HgNvDP/3uJdrww yzsIvdrUvm0KMm5Sx6Wdq8KLnkNIXndvZ7OHS6biP2SWzJA/o0qmeMwNei2g+l2/j+gBDSwOLcjkN /4lHMQgkNRU8W8hUdhYB+O0PRvg76koEcpFJ2/k2ZTuXp2nrccea0WECqn2cJSCivXxveoLZHUyh0 Gs61DR2w==; Received: from [54.239.6.186] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tNWI9-00000006lBh-1qyT; Tue, 17 Dec 2024 12:03:10 +0000 Message-ID: <9ee61d2b89b4cecd10ece64002bf2c06648e1de7.camel@infradead.org> Subject: Re: [PATCH v5 07/20] x86/kexec: Invoke copy of relocate_kernel() instead of the original From: David Woodhouse To: Nathan Chancellor Cc: 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 , jpoimboe@kernel.org, bsz@amazon.de Date: Tue, 17 Dec 2024 13:03:07 +0100 In-Reply-To: <79ea9c10ae4f1dae16be8c05bb7b7e6b72512f10.camel@infradead.org> 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> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-vlXdLjjy1Hijhl7mWtJA" 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 --=-vlXdLjjy1Hijhl7mWtJA Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2024-12-16 at 12:09 +0000, David Woodhouse wrote: > On Sun, 2024-12-15 at 22:49 -0700, Nathan Chancellor wrote: > > On Sun, Dec 15, 2024 at 10:09:57AM +0000, David Woodhouse wrote: > > > On Sat, 2024-12-14 at 16:08 -0700, Nathan Chancellor wrote: > > > >=20 > > > > I guess this seems somewhat unavoidable because control_page is jus= t a > > > > 'void *', perhaps machine_kexec() should just be marked as __nocfi?= This > > > > diff resolves that issue for me. > > >=20 > > > The patch below seems to work too. I already wanted to deal with the > >=20 > > Can confirm, thanks for the quick fix. With your fix for the first issu= e > > I reported, the fix I sent for LTO, and this patch below, I can kexec o= n > > a CFI and LTO enabled kernel without any issues. >=20 > Argh, using SYM_TYPED_FUNC_START() leads to objtool having more opinions. >=20 > I have the Clang build working in my tree now, but the GCC build now comp= lains >=20 > vmlinux.o: warning: objtool: relocate_kernel+0x0: unreachable instruction >=20 > It seems like adding UNWIND_HINT_FUNC ought to be the answer for that? > But then it complains about this instead: >=20 > vmlinux.o: warning: objtool: relocate_kernel+0x69: unsupported stack regi= ster modification >=20 > That's the lea instruction at > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 lea=C2=A0=C2=A0=C2=A0=C2=A0 PAGE_SIZ= E(%rsi), %rsp > =C2=A079:=C2=A0=C2=A0 48 8d a6 00 10 00 00=C2=A0=C2=A0=C2=A0 lea=C2=A0=C2= =A0=C2=A0 0x1000(%rsi),%rsp >=20 > I've pushed what I have to my kexec-debug branch; I was hoping to post > the fixes for the tip/x86/boot branch this morning but I've run out of > time and will be travelling for the rest of the week. Will try to get > something sent out this evening when I land. >=20 > I may resort to the __nocfi option for now. As noted on the typedef > patch and in IRC, the whole SYM_TYPED_FUNC_START() thing using the type > information from the *C* code which is actually doing the call anyway, > is a bit tautological anyway. 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=3Drefs/= heads/kexec-debug I'd really appreciate some help in getting objtool to stop whining about them, for *both* Clang and GCC builds at the same time :) --=-vlXdLjjy1Hijhl7mWtJA 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 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