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 3B8B81EF0A1 for ; Tue, 5 Nov 2024 20:17:23 +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=1730837846; cv=none; b=AtERMt6Bwt1ahGocDokOv+OXYTDrjpaPFNtFn2pkZDMSrIHQxMLStvgUwzpseMD7nvJBnfLwzKgor0mFbApKixw03lNjbwq90rJkVzKIkX2KkUm2YOonOc0LU9b7keWUNwdR+dfww0+1kEO4hnrH+UDt/aPk9wtKinhjWhzdWOw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730837846; c=relaxed/simple; bh=1XcbyPRpsctqDPkmA0iW8ot3Il7FstDU7Kf9jxEpaGg=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=jGJ/775XEIWnaDN8+iP4laXH6GpkNAW2XkzCXMeLwY5QSSkS/X/WqiKVwlJ4zzof+enj3KyzsADoVKm98BLalwM5o03lXiIDGQStSszgN0aV+RDsDND+r/BEnfDZxDZYx+GiRc1VDyvXTuzRffm0PIA9AE/5I6Rem73qyomsLsw= 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=X5YUbOf7; 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="X5YUbOf7" 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=1XcbyPRpsctqDPkmA0iW8ot3Il7FstDU7Kf9jxEpaGg=; b=X5YUbOf7OX0RGccoOKKCD++dql ijVaxexPn0XQ46WAT3a1nhB2zRgRb3LpSAybSrqpRSdKmlgTvQigEzK+/puemewfVLTumaePXpKd1 Xv/ZQuL25mbqBw/+3qyl/okjx0uA+J1Hj2PomFaSfBgkOt8raM7/bkWwSaIrVw7RxxtrOOSX2on7v cVj2T7XCrXwVCfZilPc82uT7Z804VbZotsMzntNyg634nr0fPKCGIhtlczGnGNmJVcq/ijqlCHNRF tYFmuQtZIhZujP7pPcIHJB6bk+6rH3hAtJoW6hYFN7LwS4zXtXh1RGn+2581JUcdlKy5ZLOL7CtdP dEyuae7g==; Received: from [205.251.233.52] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1t8PzB-00000003aQz-0nKA; Tue, 05 Nov 2024 20:17:10 +0000 Message-ID: Subject: Re: [RFC PATCH 1/7] x86/kexec: Clean up and document register use in relocate_kernel_64.S From: David Woodhouse To: "Huang, Kai" , "kexec@lists.infradead.org" Cc: "x86@kernel.org" , "bp@alien8.de" , "hpa@zytor.com" , "mingo@redhat.com" , "tglx@linutronix.de" , "kirill.shutemov@linux.intel.com" , "linux-kernel@vger.kernel.org" , "horms@kernel.org" , "dave.hansen@linux.intel.com" , "nik.borisov@suse.com" Date: Tue, 05 Nov 2024 12:17:05 -0800 In-Reply-To: References: <20241103054019.3795299-1-dwmw2@infradead.org> <20241103054019.3795299-2-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-KnQ3JKkbgs5xUum+eoyB" User-Agent: Evolution 3.44.4-0ubuntu2 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 --=-KnQ3JKkbgs5xUum+eoyB Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2024-11-05 at 10:00 +0000, Huang, Kai wrote: > On Sun, 2024-11-03 at 05:35 +0000, David Woodhouse wrote: > > From: David Woodhouse > >=20 > > Add more comments explaining what each register contains, and save the > > preserve_context flag to a non-clobbered register sooner, to keep thing= s > > simpler. > >=20 > > Signed-off-by: David Woodhouse > > --- > > =C2=A0arch/x86/kernel/relocate_kernel_64.S | 17 +++++++++++++---- > > =C2=A01 file changed, 13 insertions(+), 4 deletions(-) > >=20 > > diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/rel= ocate_kernel_64.S > > index e9e88c342f75..c065806884f8 100644 > > --- a/arch/x86/kernel/relocate_kernel_64.S > > +++ b/arch/x86/kernel/relocate_kernel_64.S > > @@ -100,6 +100,9 @@ SYM_CODE_START_NOALIGN(relocate_kernel) > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0movq=C2=A0=C2=A0=C2=A0= =C2=A0%r10, CP_PA_SWAP_PAGE(%r11) > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0movq=C2=A0=C2=A0=C2=A0= =C2=A0%rdi, CP_PA_BACKUP_PAGES_MAP(%r11) > > =C2=A0 > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0/* Save the preserve_context= to %r11 as swap_pages clobbers %rcx. */ > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0movq=C2=A0=C2=A0=C2=A0=C2=A0= %rcx, %r11 > > + >=20 > Seems moving this here won't break anything.=C2=A0 From functionality's p= erspective > there's no need move this here, but fine to me since the move is needed f= or the > sake of adding the comment (below) to identity_mapped. I believe I did actually use %rcx in the debug code I added later, didn't I? > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0/* Switch to the identi= ty mapped page tables */ > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0movq=C2=A0=C2=A0=C2=A0= =C2=A0%r9, %cr3 > > =C2=A0 > > @@ -116,6 +119,13 @@ SYM_CODE_END(relocate_kernel) > > =C2=A0 > > =C2=A0SYM_CODE_START_LOCAL_NOALIGN(identity_mapped) > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0UNWIND_HINT_END_OF_STAC= K > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0/* > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * %rdi=C2=A0indirection pag= e > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * %rdx start address > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * %r11 preserve_context > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * %r12 host_mem_enc_active > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 */ > > + >=20 > I think adding this comment is the main purpose of this patch.=C2=A0 Sinc= e we have > listed 4 regs in the comment, how about also add an entry for %r13? >=20 > Something like: >=20 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0%r13 original CR4 when re= locate_kernel() is invoked >=20 > Yeah this is kinda mentioned in later code but it seems it's more complet= e if we > also mention %r13 here. Ack, I'll add that too. Thanks. > Anyway, I suppose adding this comment is kinda helpful, so: >=20 > Acked-by: Kai Huang >=20 --=-KnQ3JKkbgs5xUum+eoyB 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 AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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