From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x227cNOpyN+bQJJk9upbMILc6dJmcj7OGraB51+jssx1wucXQ/2F++D8w9tU0xQiK2kYxoZ1Z ARC-Seal: i=1; a=rsa-sha256; t=1516566509; cv=none; d=google.com; s=arc-20160816; b=WhJw20ik66FrgW+DGcqgqjLIW06TUWAJ+bt6FQtb29evf0lnliWr7wdvoANCpKcGHP bvpDHowx2yJNhWcrbDjegqJO4fQzmE4cID8xh1NfowU51351uQykAMy9ZQ8O3L5DJyn9 bEZRqjD1sY+Rmxpmb2LeHNBsHaA0PSzG56ZEBZlwyWTBrGL567agAnMJ6q1sCdJ74Z/j Ap2f+8DHfiKZZVL7GHoC19fopNCC6l5wsumw8YYd/cM6xAXCllInW06qHmsEJbuUFCfv gJyRjZJQg0gB3AHTiY9R2j5MAQL1+3OVJMl0/N4CyaRJk9TcRMI5v3mbvnyVj9E0GJN7 VlAg== 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=fHO13mqEo+SGzOacCoikf0FTnqhDlD65FEtBqy2SO5w=; b=q2Bg/iotFpH4HWwrwdrtJr8JLmEr3PjuV1jLOF+UXf22ADyaQ3jp59YftQXyKL7Orr 9uhdBklpqbkEsmiUIsjoFziKJSyyKGHvI+UZTVJCUkW4fSmHMkx4bNUAYVI5KDlnNet8 tjyuhcfxcli7WhRCwZ6R12sFzBdL3RDyL7eCvwxFX9HB9qZJfXQ27wgch7ouVHaGVImC oOg7+R9dTTOSC3/nCGtFU8M6GfiJNhGxvqS+BfLvmM2AkdfTomOfAcQTHhrotjXlcS9S 0aP1toVhxcXhCA7NVfpJlo09bCv6HIUA8/YX8GC6N8Kn7XlTyOTNWD0uSwJ+F4xyFw0T AvOQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=CeXLNvlA; spf=pass (google.com: best guess record for domain of batv+c3727a9e9cf4ad240057+5264+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 as permitted sender) smtp.mailfrom=BATV+c3727a9e9cf4ad240057+5264+infradead.org+dwmw2@twosheds.srs.infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=CeXLNvlA; spf=pass (google.com: best guess record for domain of batv+c3727a9e9cf4ad240057+5264+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 as permitted sender) smtp.mailfrom=BATV+c3727a9e9cf4ad240057+5264+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1516566497.9814.78.camel@infradead.org> Subject: Re: [RFC 09/10] x86/enter: Create macros to restrict/unrestrict Indirect Branch Speculation From: David Woodhouse To: Linus Torvalds , KarimAllah Ahmed Cc: Linux Kernel Mailing List , 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 , Masami Hiramatsu , Paolo Bonzini , Peter Zijlstra , Radim =?UTF-8?Q?Kr=C4=8Dm=C3=A1=C5=99?= , Thomas Gleixner , Tim Chen , Tom Lendacky , kvm@vger.kernel.org, x86@kernel.org, Arjan Van De Ven In-Reply-To: References: <1516476182-5153-1-git-send-email-karahmed@amazon.de> <1516476182-5153-10-git-send-email-karahmed@amazon.de> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-Lfv9XEQ99D9Mvgm8yhw8" Date: Sun, 21 Jan 2018 20:28:17 +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?1590140582166248265?= X-GMAIL-MSGID: =?utf-8?q?1590235243998432028?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-Lfv9XEQ99D9Mvgm8yhw8 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sun, 2018-01-21 at 11:34 -0800, Linus Torvalds wrote: > All of this is pure garbage. >=20 > Is Intel really planning on making this shit architectural? Has > anybody talked to them and told them they are f*cking insane? >=20 > Please, any Intel engineers here - talk to your managers.=C2=A0 If the alternative was a two-decade product recall and giving everyone free CPUs, I'm not sure it was entirely insane. Certainly it's a nasty hack, but hey =E2=80=94 the world was on fire and in= the end we didn't have to just turn the datacentres off and go back to goat farming, so it's not all bad. As a hack for existing CPUs, it's just about tolerable =E2=80=94 as long as= it can die entirely by the next generation. So the part is I think is odd is the IBRS_ALL feature, where a future CPU will advertise "I am able to be not broken" and then you have to set the IBRS bit once at boot time to *ask* it not to be broken. That part is weird, because it ought to have been treated like the RDCL_NO bit =E2=80=94 just "you don't have to worry any more, it got better". https://software.intel.com/sites/default/files/managed/c5/63/336996-Specula= tive-Execution-Side-Channel-Mitigations.pdf We do need the IBPB feature to complete the protection that retpoline gives us =E2=80=94 it's that or rebuild all of userspace with retpoline. We'll also want to expose IBRS to VM guests, since Windows uses it. I think we could probably live without the IBRS frobbing in our own syscall/interrupt paths, as long as we're prepared to live with the very hypothetical holes that still exist on Skylake. Because I like IBRS more... no, let me rephrase... I hate IBRS less than I hate the 'deepstack' and other stuff that was being proposed to make Skylake almost safe with retpoline. --=-Lfv9XEQ99D9Mvgm8yhw8 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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