From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 8588E2F4A for ; Fri, 14 Mar 2025 10:37:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741948678; cv=none; b=BH9aSZdPreyHhu8JEhAuahDLPxwCQEaTmOfyuSwsDgHxf1AIreyoQ5VedlPW7obsHpHPpeuPGjup8tvK+UKrlLAFGQOaT+Yr8dgdEqh93+x1yvL+Zzg570SgHojKjlhiil5gmq2aZiT3WKNYVvqZX6u/I7e/oOo/xLcdFVTBumc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741948678; c=relaxed/simple; bh=Zi7IUh08FLDx3MKJaUW7SfJqTGI6y/AgthEpknF7UmU=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=E5ht/A3l5FOUkLkPXlx7PNe2RO+BW3AhchUYuU4D9IFdGch7/lVezczRy6rDs+E/K9+E08Cefv+kOR7436BGSS6KrbPH2APeO9rv+2mNZOPkR4t3U5Rbv0A80AfERJ+9Wq+1cqqOKTkYhjXFgniv68ybmWwdpoVo2NQEL/EwJvc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=desiato.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=TrqxIeOH; arc=none smtp.client-ip=90.155.92.199 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=desiato.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="TrqxIeOH" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; 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=Zi7IUh08FLDx3MKJaUW7SfJqTGI6y/AgthEpknF7UmU=; b=TrqxIeOHP1LV37GeljqMfDcdEj eJs0s9tdR+Zil412p+Z3ehJPfG54EYblslioQTBkeTxTApJAnlLQkZoC0uTEBmj/bB2AV6zZRycg8 PINGMEkR5M6aGGp351uMoCX9SZeN+FdGzkkCb4GR2x/1onJQtf7G5AQGkEUC4iePNJGtRGtdVr+DC gG+RBcYd8jCs64n67mpn27t7gXD1n8zab19guJ6FhyaxliPVCuTKSy8ZsGWEj73TdZHaySuzUGoIG GoI2fM0lXTInHr/c081D4FWpoT1/cNBtxnhziWhC+m3mknbIIQfWc8s+/F5yGKCb6Oc2Un2YOexdZ QGN/+YFA==; Received: from [172.31.31.145] (helo=u09cd745991455d.ant.amazon.com) by desiato.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tt2QD-00000002sfY-3M90; Fri, 14 Mar 2025 10:37:45 +0000 Message-ID: Subject: Re: [PATCH v7 0/8] x86/kexec: Add exception handling for relocate_kernel 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, bsz@amazon.de Date: Fri, 14 Mar 2025 10:37:45 +0000 In-Reply-To: References: <20250312144257.2348250-1-dwmw2@infradead.org> <7f36d90ada07281dd0efa4339c991cb2ecec4da2.camel@infradead.org> <48dc1e006cbbf1f8af4c9120795a840c601ed172.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-5rxxHd/arnnxRHeRxl+i" 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 desiato.infradead.org. See http://www.infradead.org/rpr.html --=-5rxxHd/arnnxRHeRxl+i Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2025-03-14 at 11:21 +0100, Ingo Molnar wrote: >=20 > I've applied patch #1 back to tip:x86/boot. >=20 > I've skipped the -v7 versions of patch #2 and #3 because AFAICS you've= =20 > changed exc_handler already, so a backmerge of this annotation fix=20 > wouldn't be enough. I haven't (yet) changed exc_handler, but I did post that annotation fix as a patch against patch 3 in the series, when actually it should be applied as as fixup to patch 2. I *am* cleaning up exc_handler in patch 3 though, for a more 'warm and fuzzy' experience on int3 rather than dumping the full register set. So I'll repost it from patch 2 against the new tip/x86/boot, including the annotation fix in the right place. Thanks. I haven't yet decided what to do about the unconditional int3. Slightly tempted to suggest we put it in #ifdef CONFIG_DEBUG_ENTRY now I've been reminded that option exists? But we should *also* be doing better testing of kexec-jump, with something like that test case I posted, and adding an int3 into that would be trivial too. --=-5rxxHd/arnnxRHeRxl+i Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv a2V5IFNlY3VyZSBFbWFpbCBHMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMjvgLKj jfhCFqxYyRiW8g3cNFAvltDbK5AzcOaR7yVzVGadr4YcCVxjKrEJOgi7WEOH8rUgCNB5cTD8N/Et GfZI+LGqSv0YtNa54T9D1AWJy08ZKkWvfGGIXN9UFAPMJ6OLLH/UUEgFa+7KlrEvMUupDFGnnR06 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