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 494B7186E26 for ; Mon, 25 Nov 2024 09:32:30 +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=1732527153; cv=none; b=P10Csv2S/b7kBCpZJBoOBvYIr5hsJyBHyx9NEV73Uu59W6OYcsYVWxKZOr95C/+/FJUanDcdGGj+6yipE4NlAbGxommUAoVaHI8+TfsYaDtuEcrguFXfD6R8tOe7Ilx3qCy1Hizqd72ifpzfKxGV8u/eWmrw5IgxROOpyN4EppM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732527153; c=relaxed/simple; bh=BXVjUc2vzXpoOZX1fNgXhlRgmcWWrrcPsPBirvcn7d4=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=SAbq3Ey8u1BTcpkty+cAQqFUuZpuiJ/9bswDd47LDhmUMvX4E62N8D0Ob7gPd3Q+9H+U8g7GLFxQH/xkoaNqx9FgRA4LOxMANj4PXGJ7NEqikGD6+CaK+Dj5RsDf75h+NFWYhOQX6T2SILr/jB6WRyrkTfQUnstfjYGU8kz1YN0= 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=rCC6ac85; 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="rCC6ac85" 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=hsLYYwugmragwR1cVxrYbXSwiVZvHMqumesYsp7bbp4=; b=rCC6ac85MIxm52+cV8P8/ldgfN dRy7pf1RV85RT/m3rXbRwCdQpUtbppUhm+isHELkmxd2rJ/W7eENsv254pUjhdNx9WlbpZ7DecYy7 NOYz/ScbsKvpLOQru281udfNpimfr54kcKkFY5bK6OSKleTLXtFMqSlIRKk0HH5CLdTJF1TCl3FfE mZJMNL+hiFxowfaaKOnt+53ujQc7rXXvBZjOmas4tJ6cAPWUdVFzXyFhPNr3pCtm/zEdazHODZHlG XjP5eK08aWLS+tlyy91kgPO44uvguMH1sPuA8o51UnBkiWQJ9FqJNO5tIKLemiKbDHP+Ofniuw68n vDXQovTA==; Received: from [54.239.6.187] (helo=edge-m3-r1-122.e-iad51.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tFVS2-0000000Bg8M-15uT; Mon, 25 Nov 2024 09:32:15 +0000 Message-ID: <334ae44077315e2b69529b6fef8d85ec55f80ecf.camel@infradead.org> Subject: Re: [RFC PATCH v2 16/16] [DO NOT MERGE] x86/kexec: enable DEBUG From: David Woodhouse To: Ingo Molnar 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 Date: Mon, 25 Nov 2024 09:32:14 +0000 In-Reply-To: References: <20241122224715.171751-1-dwmw2@infradead.org> <20241122224715.171751-17-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-rw9RhjKybpoyDASeOFr7" 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 --=-rw9RhjKybpoyDASeOFr7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2024-11-25 at 10:21 +0100, Ingo Molnar wrote: >=20 > * David Woodhouse wrote: >=20 > > From: David Woodhouse > >=20 > > Signed-off-by: David Woodhouse > > --- > > =C2=A0arch/x86/kernel/relocate_kernel_64.S | 4 ++++ > > =C2=A01 file changed, 4 insertions(+) > >=20 > > diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/rel= ocate_kernel_64.S > > index 67f6853c7abe..ebbd76c9a3e9 100644 > > --- a/arch/x86/kernel/relocate_kernel_64.S > > +++ b/arch/x86/kernel/relocate_kernel_64.S > > @@ -14,6 +14,8 @@ > > =C2=A0#include > > =C2=A0#include > > =C2=A0 > > +#define DEBUG > > + > > =C2=A0/* > > =C2=A0 * Must be relocatable PIC code callable as a C function, in part= icular > > =C2=A0 * there must be a plain RET and not jump to return thunk. > > @@ -191,6 +193,8 @@ SYM_CODE_START_LOCAL_NOALIGN(identity_mapped) > > =C2=A0 pushw $0xff > > =C2=A0 lidt (%rsp) > > =C2=A0 addq $10, %rsp > > + > > + int3 > > =C2=A0#endif /* DEBUG */ >=20 > That's a really nice piece of debugging code written in assembly,=20 > combined with the exception handling feature that generates debug=20 > output to begin with. Epic effort. :-) Thanks :) > Just curious: did you write this code to debug the series, or was there= =20 > some original hair-tearing regression that motivated you? Is there's an= =20 > upstream fix to marvel at and be horrified about in equal measure? https://lore.kernel.org/all/2ab14f6f-2690-056b-cf9e-38a12dafd728@amd.com/t/= #u is the upstream fix. It's all the more horrifying because it was already *fixed* upstream before I lost weeks of my life to chasing it. And the trigger which actually made it *happen*, and made our production systems allocate memory within that dangerous 1MiB region adjacent to the RMP table, was a tweak to the NMI watchdog period... leading to an assumption that we were getting stray perf NMIs during the kexec, and a *long* wild goose chase based on that false assumption... Once I'd written the debug code, I just wanted to clean it up a bit and push it out for the benefit of others; that *was* the main point of this series. All the rest of the cleanups are just yak shaving. The realisation that we never even explicitly mapped the control code page and always just got lucky because it happened to be in the same 2MiB or 1GiB superpage as something else that we did map... was just a bonus :) (That one is fixed in v3 which I'll post shortly, and is already in=20 https://git.infradead.org/users/dwmw2/linux.git/shortlog/refs/heads/kexec-d= ebug ) > I'd argue that this debugging code probably needs a default-off Kconfig= =20 > option, even with the obvious hard-coded environmental limitations &=20 > assumptions it has. Could be useful to very early debugging & would=20 > preserve your effort without it bitrotting too obviously. Yeah. In v3 I've made it a config option, and made it use the early_printk serial console (as long as that's an I/O based 8250; we can add others too later). --=-rw9RhjKybpoyDASeOFr7 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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