From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x226QFNFVuy9s18SdHLzSJaVqTzKKgtje3F9vLCQFt90CJABpmfgAWf8DlrMR20ux27IXEZvM ARC-Seal: i=1; a=rsa-sha256; t=1516565233; cv=none; d=google.com; s=arc-20160816; b=A9BSuKqlHjP4PSZa8KNrBtrk+3u1iAISFQKwixWp8RbQPFpXgifmXnj2rO4nk9mukI QwrT7herqSgiK4OsHry3EFq4xDVRVjnrk8H8rOQ2Nozy8TAMZ3TZQBDVYHhDjRCcotOX 3PBaxPJd7QqhWFsYZ2Yk339xKQzl8uQr/dUDoe8H+NSNTFbSRXZBdcwBB0Y7hCxdDHoU yCA++imdIG080pHJq9CI9vlPRFkkoItsAd6bJG6MwmYitzoKld16yYKPFn728a0HbShM RrgZp7zulf+Hq7FUcZOgMLZ3BnIS17VbRt3KQcfMpQ2y5e0OqS7jfeofNBFDhUX505g/ hXtg== 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=+tT1RfOClWD8WQKpaETlnyz6NO/GIsT420z5qdtYjj8=; b=BhHYSvAMLS1oQjtk5kmmJkVCgTb6116q3yShGGhyG0spgatHSx4oKwkbEDhuDOq75K 7rX31/PbKLbF/YEgFhorok1s9rNs0RENZluC35Gj4PcmJXMBe2/FScXJzIPkvTabnL3O lgLM8QYVyymSzG7j2vFVmOYbDDodkFi1SP5BAKKETHG3/CNRfQYlsExWvJ9NcdtM7Hhg v0N+tXps+B+VAETYed/cB54YIE26HFmdeapC5eh+aFpxzpQwx7kpD8RMg+E7DgRTb8t9 oRv7tGzK4yED72e668Ex4OImRdCZdjEm9DQ+qDShTwQNZbLkGUIO2Zt4NJ+w4qVaFOmM a4LA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=bm4ijcBn; spf=pass (google.com: best guess record for domain of batv+c3727a9e9cf4ad240057+5264+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 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=bm4ijcBn; spf=pass (google.com: best guess record for domain of batv+c3727a9e9cf4ad240057+5264+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+c3727a9e9cf4ad240057+5264+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1516565226.9814.63.camel@infradead.org> Subject: Re: [PATCH v2 5/8] x86/speculation: Add basic support for IBPB From: David Woodhouse To: Borislav Petkov Cc: arjan@linux.intel.com, tglx@linutronix.de, karahmed@amazon.de, x86@kernel.org, linux-kernel@vger.kernel.org, tim.c.chen@linux.intel.com, peterz@infradead.org, pbonzini@redhat.com, ak@linux.intel.com, torvalds@linux-foundation.org, gregkh@linux-foundation.org In-Reply-To: <20180121195407.hbahkbmc37yrrvi4@pd.tnic> References: <1516528149-9370-1-git-send-email-dwmw@amazon.co.uk> <1516528149-9370-6-git-send-email-dwmw@amazon.co.uk> <20180121180621.ufmc5m7nr6v4tjvc@pd.tnic> <1516560862.9814.47.camel@infradead.org> <20180121190430.ss22poeakvwzvcal@pd.tnic> <1516563099.9814.54.camel@infradead.org> <20180121195407.hbahkbmc37yrrvi4@pd.tnic> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-U7LxjmEhgYxRkdYsAjoD" Date: Sun, 21 Jan 2018 20:07:06 +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?1590195048808685762?= X-GMAIL-MSGID: =?utf-8?q?1590233906591750291?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-U7LxjmEhgYxRkdYsAjoD Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sun, 2018-01-21 at 20:54 +0100, Borislav Petkov wrote: > On Sun, Jan 21, 2018 at 07:31:39PM +0000, David Woodhouse wrote: > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (boot_cpu_has(X86_= FEATURE_IBPB)) > > > =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=C2=A0=C2=A0wrmsr(MSR_IA32_PRED_CMD, PRED_CMD_IBPB, 0); > > >=C2=A0 > > > Problem solved. > >=C2=A0 > > Nope. Plenty of patch sets *did* have the bug above though, until it > > was spotted. >=20 > And that bug is...? That bug is the *reason* we're arguing about static_cpu_has vs. ALTERNATIVE.=C2=A0 A conditional branch that the CPU sees can be speculated over... Now, Andrew is right that in a number of cases there will be another serialising instruction before we ever hit a problematic indirect branch. But as I just said elsewhere, I'd really like the *primitives* to support unconditional operation. --=-U7LxjmEhgYxRkdYsAjoD 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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