From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x224XWep01/et8P28D2sYQaFGL2c0e7sVv71toOfVRVvfn6f/2+p2QlEO24X8UX5StPrWzWtZ ARC-Seal: i=1; a=rsa-sha256; t=1516956471; cv=none; d=google.com; s=arc-20160816; b=dD0QYVVD9n/a1h1Yp4fW40WxUkN/q0s77JjuCDdif4Kal0DDkRHqUn0ItWohLFbVq0 rcPfGljSZr6mRR95Qq28sKmUdWdaB3gjmgZxDGyGcT3/zOKm4U5PUqGTY0zUi7sm+Pae qiX2FudV8WbqdoMWXkz7pttE/lzKSFUnQLQkfpFGTQfoEflCHpLGsL5I3ebj1eGigXIy tvh5Tg+6BUxeMjn+eUt3Ucuy7IFraUQ6hbTp9LG+kegZQ7KCyDxCITQzndgYdFHxnA4A vfeMOZ5V6rOKj2dMGzQiRDGurbUQZigBYM6MjgHWThCYqiBfnrAnkxtFLo9E2j7FkQFU UBAg== 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=arViJeXHBsMezrDBO/3vn390P6E9WdzB1bnHh8rXN8Y=; b=W8MYrjaDGcTQJiEW/PyySX32yHQAC2TJg3rJQKX+zBlSxRY2JtJEoBr2twM1z7by45 YTAkvALzC2r4mdTM/8aKL1NLOrs1fHV98JjYzpuYrR+/nBQ7eT5J04LAQAX7ZHhBWyxu ruwJE8RI/JfcqDbKw/vzdgDPfr6QeuWTS39+P3ax4MDeN8EPTkkr5TsOujcgB/Ga8VWk 9Z3vo8yy+KAjI6xl5gUBJ/cGkZ9gqb0vuEU+5M+KmqOVyfP0SbPTVMHXkF8ajSlKmi+c cMnxHT7FNr3JufsVHFIFzDdAiDmJ9+r512vewTPlgg+A1M70HZj7oh+0MyC0qz4s212W j/fQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=IZ0UroKe; spf=pass (google.com: best guess record for domain of batv+5c899106830c0475ba9f+5269+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 as permitted sender) smtp.mailfrom=BATV+5c899106830c0475ba9f+5269+infradead.org+dwmw2@twosheds.srs.infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=IZ0UroKe; spf=pass (google.com: best guess record for domain of batv+5c899106830c0475ba9f+5269+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 as permitted sender) smtp.mailfrom=BATV+5c899106830c0475ba9f+5269+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1516956417.30244.154.camel@infradead.org> Subject: Re: [RFC 09/10] x86/enter: Create macros to restrict/unrestrict Indirect Branch Speculation From: David Woodhouse To: Liran Alon , dave.hansen@intel.com Cc: labbott@redhat.com, luto@kernel.org, Janakarajan.Natarajan@amd.com, bp@suse.de, torvalds@linux-foundation.org, asit.k.mallick@intel.com, rkrcmar@redhat.com, karahmed@amazon.de, hpa@zytor.com, jun.nakajima@intel.com, mingo@redhat.com, x86@kernel.org, ashok.raj@intel.com, arjan.van.de.ven@intel.com, tim.c.chen@linux.intel.com, pbonzini@redhat.com, ak@linux.intel.com, linux-kernel@vger.kernel.org, peterz@infradead.org, tglx@linutronix.de, gregkh@linuxfoundation.org, mhiramat@kernel.org, arjan@linux.intel.com, thomas.lendacky@amd.com, dan.j.williams@intel.com, joro@8bytes.org, aarcange@redhat.com, kvm@vger.kernel.org In-Reply-To: <7c0b0879-3448-43e4-8380-4708fc787113@default> References: <7c0b0879-3448-43e4-8380-4708fc787113@default> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-ehjgSo0sF/4BJrr9SaTn" Date: Fri, 26 Jan 2018 08:46:57 +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?1590644148036044379?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-ehjgSo0sF/4BJrr9SaTn Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2018-01-25 at 18:11 -0800, Liran Alon wrote: >=20 > P.S: > It seems to me that all these issues could be resolved completely at > hardware in future CPUs if BTB/BHB/RSB entries were tagged with > prediction-mode (or similar metadata). It will be nice if Intel/AMD > could share if that is the planned long-term solution instead of > IBRS-all-the-time. IBRS-all-the-time is tagging with the ring and VMX root/non-root mode, it seems. That much they could slip into the upcoming generation of CPUs. And it's supposed to be fast=C2=B9; none of the dirty hacks in microcode that they needed to implement the first-generation IBRS. But we still need to tag with ASID/VMID and do proper flushing for those, before we can completely ditch the need to do IBPB at the right times. Reading between the lines, I don't think they could add *that* without stopping the fabs for a year or so while they go back to the drawing board. But yes, I sincerely hope they *are* planning to do it, and expose a 'SPECTRE_NO' bit in IA32_ARCH_CAPABILITIES, as soon as is humanly possible. =C2=B9 Fast enough that we'll want to use it and ALTERNATIVE out the=C2=A0 =C2=A0 retpolines. --=-ehjgSo0sF/4BJrr9SaTn 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 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