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 3B41223875D; Tue, 26 Aug 2025 17:28:34 +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=1756229316; cv=none; b=LEACaou3U3i7agrUnK9r2gQCX7Jvabpi4tQOtC4qE6lWpras9+SQBMFyKAPDEO9ETYOrd6sqQT/fMFLjpiCkc1v6R1fkVv02Bq8VFjDm5EAK8rLaYrVJom6g3AoT21N9IgvWL/m3KOccOZ0rAMTIu3ESos+W34hFLvygjxk4Mjc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756229316; c=relaxed/simple; bh=Es/nHV4wXLaF86fAAlmXlofNHeuBtrm8u8KTacng4xc=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=A40KLBbD4g8QH3k3ZdFPTTUbJdSf/CQqnt7iNrG8bgno8uLCrpJZfExza4PhOc5k4WmCdXj7NP+9Gc7wgicv1xKCQtJCYIvY8VOBbJ4tSp5de3HkpmvBustQg8oIMyGii1sTgfci7U1ukqIeBqfUihPc19Z+tPVRI7iZEAgrznI= 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=Q4c0djTF; 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="Q4c0djTF" 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=Es/nHV4wXLaF86fAAlmXlofNHeuBtrm8u8KTacng4xc=; b=Q4c0djTFja5VsPOE3UXJPLsO4b AHnUU/EHCeG/FY4DQonQuPX/pdHqvrVBW5CuocTat5PqsPrDj7XVi9gra+30H2YwHY6yCW/trk4hv xGQRCmCaohneLUQbAGM1K3CVx3jyh2RfYaRdZTbzAtUVfDZyrcjnxOGMHCSfUbh81Eq7MymDBtzGG tt0+ilIc0jTkQqRieBZoNsWeCAYdjTn7P289lB5FWVbTS++0SXa8qTb+ojdyofP8CXirYu3gwgow/ R1bHa1TnGbIco1M3snaj9BDl/M23rB426Q4dMLkrDRT6ZdxW8tKOSSLeIfS5qQDClOI9Eku516b09 y/akYnhA==; Received: from 54-240-197-231.amazon.com ([54.240.197.231] helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1uqxT0-00000006W1j-2Xlh; Tue, 26 Aug 2025 17:28:19 +0000 Message-ID: <2ea086773fd63441fa14d22636049cc91ff44d35.camel@infradead.org> Subject: Re: [PATCH v7 1/7] x86/kexec: Consolidate relocate_kernel() function parameters From: David Woodhouse To: Kai Huang , dave.hansen@intel.com, bp@alien8.de, tglx@linutronix.de, peterz@infradead.org, mingo@redhat.com, hpa@zytor.com, thomas.lendacky@amd.com Cc: x86@kernel.org, kas@kernel.org, rick.p.edgecombe@intel.com, linux-kernel@vger.kernel.org, pbonzini@redhat.com, seanjc@google.com, kvm@vger.kernel.org, reinette.chatre@intel.com, isaku.yamahata@intel.com, dan.j.williams@intel.com, ashish.kalra@amd.com, nik.borisov@suse.com, chao.gao@intel.com, sagis@google.com, farrah.chen@intel.com Date: Tue, 26 Aug 2025 18:28:17 +0100 In-Reply-To: <16e7fb2fcdaee423c7177e06a36f0f039ebd4527.1756161460.git.kai.huang@intel.com> References: <16e7fb2fcdaee423c7177e06a36f0f039ebd4527.1756161460.git.kai.huang@intel.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-FuWmqicby5bPqCjxQvVH" User-Agent: Evolution 3.52.3-0ubuntu1 Precedence: bulk X-Mailing-List: kvm@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 --=-FuWmqicby5bPqCjxQvVH Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2025-08-26 at 10:58 +1200, Kai Huang wrote: > During kexec, the kernel jumps to the new kernel in relocate_kernel(), > which is implemented in assembly and both 32-bit and 64-bit have their > own version. >=20 > Currently, for both 32-bit and 64-bit, the last two parameters of the > relocate_kernel() are both 'unsigned int' but actually they only convey > a boolean, i.e., one bit information.=C2=A0 The 'unsigned int' has enough > space to carry two bits information therefore there's no need to pass > the two booleans in two separate 'unsigned int'. >=20 > Consolidate the last two function parameters of relocate_kernel() into a > single 'unsigned int' and pass flags instead. >=20 > Only consolidate the 64-bit version albeit the similar optimization can > be done for the 32-bit version too.=C2=A0 Don't bother changing the 32-bi= t > version while it is working (since assembly code change is required). >=20 > Signed-off-by: Kai Huang > Reviewed-by: Tom Lendacky > Reviewed-by: Borislav Petkov (AMD) Reviewed-by: David Woodhouse --=-FuWmqicby5bPqCjxQvVH 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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