From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x227KDkrT3s/s1qu35aYGmTtLLyH7zI6qgn22GIJ9nJTv1K+oscmoiG83s7Vi1T+RRcVxp6yz ARC-Seal: i=1; a=rsa-sha256; t=1516797015; cv=none; d=google.com; s=arc-20160816; b=q/x+dYgIalil2byJxNYacRxZWkq1t//sMy8gtmnZgK223ldvw+UL5pea3bY7cuNBfg 0ysdt5X0ZFHQR1jEfMG8JXaL6fwvAq0fWB296c66QamFkfycIZ9qFA4oJlJHzspdRY8V Ax2QD4Qmwe2cSVaK1c++kU2Rnl8Ya5ijiF+Z5AWONWrvxKICQsyBgxPPmv7+GHYxmgED T24nbR9GrUWPCmAe308zQeCkDDgolEXzT798c7iiHEdUd2ZdeTwk0KLwBXqPfwE8zOS3 M2on7QpiaDzg+5elKbN9/uSNkP3XPpdx/uqnTqTfCk1z6Y6fgIotv3VrZmXxultKsqra 64VQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:date:face:references:in-reply-to:cc:to:from:subject :message-id:dkim-signature:arc-authentication-results; bh=0ryZC0j5YNPCxB0Vq0bC/5QbU3CUDvMuyM2YVKw1eo4=; b=D24JAob+LOpjSiIFKbvYouWkff+/9Q5Y7oPuDWqCuHRu/uWqc9P9R8ZxfPMjR2G2jr xOUL1l/jOM3HOnteW4qvba16Ic6ko6y1jxw6sgCDfol0Ens72jMOMc7YDl5pzHAL+NH/ edaJX4cZFUf0XfxpZXIglmv71fR1UOt7+ZU35RnI9Xi6pAvRF8xGby5AdKTa0G9sLblG WHZtYB81CEyEqmXstmQW54RC4iEzP+dzfvmgduhCcb9LKtfE+E1FEBPjJT08RUjxWZVX Dmv5W8sTslSiHJ6OmGSl1beo4w/xiSUMHPngdiEVR0EugwHVJvvAZdMm2fUSQi/XB8dL n7Tw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=Ej/umUMA; spf=pass (google.com: best guess record for domain of batv+76e3c31b1e0c17bac38f+5267+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+76e3c31b1e0c17bac38f+5267+infradead.org+dwmw2@twosheds.srs.infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=Ej/umUMA; spf=pass (google.com: best guess record for domain of batv+76e3c31b1e0c17bac38f+5267+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+76e3c31b1e0c17bac38f+5267+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1516797002.13558.125.camel@infradead.org> Subject: Re: [RFC 05/10] x86/speculation: Add basic IBRS support infrastructure From: David Woodhouse To: Henrique de Moraes Holschuh Cc: Peter Zijlstra , Thomas Gleixner , KarimAllah Ahmed , linux-kernel@vger.kernel.org, Andi Kleen , Andrea Arcangeli , Andy Lutomirski , Arjan van de Ven , Ashok Raj , Asit Mallick , Borislav Petkov , Dan Williams , Dave Hansen , Greg Kroah-Hartman , "H . Peter Anvin" , Ingo Molnar , Janakarajan Natarajan , Joerg Roedel , Jun Nakajima , Laura Abbott , Linus Torvalds , Masami Hiramatsu , Paolo Bonzini , Radim =?UTF-8?Q?Kr=C4=8Dm=C3=A1=C5=99?= , Tim Chen , Tom Lendacky , kvm@vger.kernel.org, x86@kernel.org In-Reply-To: <20180124104944.jbgxlvlkkqjweyar@khazad-dum.debian.net> References: <1516476182-5153-1-git-send-email-karahmed@amazon.de> <1516476182-5153-6-git-send-email-karahmed@amazon.de> <1516741116.13558.11.camel@infradead.org> <20180124084735.GM2228@hirez.programming.kicks-ass.net> <1516784541.13558.90.camel@infradead.org> <20180124104944.jbgxlvlkkqjweyar@khazad-dum.debian.net> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-ih1siMU4845EAR63NGkc" Date: Wed, 24 Jan 2018 12:30:02 +0000 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1590140581449802182?= X-GMAIL-MSGID: =?utf-8?q?1590476946897413933?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-ih1siMU4845EAR63NGkc Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2018-01-24 at 08:49 -0200, Henrique de Moraes Holschuh wrote: > On Wed, 24 Jan 2018, David Woodhouse wrote: > >=20 > > I'm kind of tempted to turn it into a whitelist just by adding 1 to the > > microcode revision in each table entry. Sure, that N+1 might be another > > microcode build that also has issues but never saw the light of day... > Watch out for the (AFAIK) still not properly documented where it should > be (i.e. the microcode chapter of the Intel SDM) weirdness in Skylake+ > microcode revision.=C2=A0=C2=A0Actually, this is related to SGX, so anyth= ing that > has SGX. >=20 > When it has SGX inside, Intel will release microcode only with even > revision numbers, but the processor may report it as odd (and will do so > by subtracting 1, so microcode 0xb0 is the same as microcode 0xaf) when > the update is loaded by the processor itself from FIT (as opposed as > being loaded by WRMSR from BIOS/UEFI/OS). > =C2=A0 > So, you could see N-1 from within Linux if we did not update the > microcode, and fail to trigger a whitelist (or mistrigger a blacklist). That's OK. If they ship a fixed 0x0200003E firmware for SKX, for example, which appears as 0x0200003D when it's loaded from FIT, that's still >=3D 0x0200003C *and* !(<0x0200003D) if we were to do that. In fact, the code for the "whitelist X+1" vs. "blacklist X" approach is *entirely* equivalent; it's purely a cosmetic change. Because =C2=A0 =C2=A0!(< X) =C2=A0 =E2=89=A1 =C2=A0 =E2=89=A5 (X+1) The *real* change here is that for =E2=88=80 SKU, we are being asked to blacklist all microcode revisions <=3D 0xFFFFFFFF=C2=B9 for now, and change that only once new microcode is actually released. Every time, and then get people to rebuild their kernels because they can *use* the features from the new microcode. =C2=B9(OK, *there's* a functional difference between whitelist and blacklis= t approach. But we'll never actually see 0xffffffff so that's not important right now :) --=-ih1siMU4845EAR63NGkc Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEFQw ggUxMIIEGaADAgECAhBNRhEyk/HZ7naOeTHWrzuAMA0GCSqGSIb3DQEBCwUAMIGXMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYD VQQKExFDT01PRE8gQ0EgTGltaXRlZDE9MDsGA1UEAxM0Q09NT0RPIFJTQSBDbGllbnQgQXV0aGVu dGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTAeFw0xNzEyMjEwMDAwMDBaFw0xODEyMjEyMzU5 NTlaMCQxIjAgBgkqhkiG9w0BCQEWE2R3bXcyQGluZnJhZGVhZC5vcmcwggEiMA0GCSqGSIb3DQEB AQUAA4IBDwAwggEKAoIBAQDgzLNWa18DNpGUj/ZeH0Sgz53ESIbzdPw3OJeuNP6jZhxZojbyfxbM hETscxI/Hj6UZ4a7sHm5BkVjlsB1Af2Za/PXUt8MmLAcPMHkMPGunvkUibEvblDvpqMkQZlaZM+t 5PqFmWkbehLaEvbpNY7dmEAAeKh4klTzJzrr5AAzaCQ32cA2e3+DEIv5O5l9ViMIjy/JM+xMQrfX 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