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Wed, 12 Sep 2018 17:16:20 +0000 Subject: Re: [PATCH v5 2/2] x86/speculation: Enable cross-hyperthread spectre v2 STIBP mitigation To: Thomas Gleixner , Tim Chen Cc: Jiri Kosina , Ingo Molnar , Peter Zijlstra , Josh Poimboeuf , Andrea Arcangeli , "Woodhouse, David" , Andi Kleen , "Schaufler, Casey" , linux-kernel@vger.kernel.org, x86@kernel.org References: From: Tom Lendacky Openpgp: preference=signencrypt Autocrypt: addr=thomas.lendacky@amd.com; prefer-encrypt=mutual; keydata= xsFNBFaNZYkBEADxg5OW/ajpUG7zgnUQPsMqWPjeAxtu4YH3lCUjWWcbUgc2qDGAijsLTFv1 kEbaJdblwYs28z3chM7QkfCGMSM29JWR1fSwPH18WyAA84YtxfPD8bfb1Exwo0CRw1RLRScn 6aJhsZJFLKyVeaPO1eequEsFQurRhLyAfgaH9iazmOVZZmxsGiNRJkQv4YnM2rZYi+4vWnxN 1ebHf4S1puN0xzQsULhG3rUyV2uIsqBFtlxZ8/r9MwOJ2mvyTXHzHdJBViOalZAUo7VFt3Fb aNkR5OR65eTL0ViQiRgFfPDBgkFCSlaxZvc7qSOcrhol160bK87qn0SbYLfplwiXZY/b/+ez 0zBtIt+uhZJ38HnOLWdda/8kuLX3qhGL5aNz1AeqcE5TW4D8v9ndYeAXFhQI7kbOhr0ruUpA udREH98EmVJsADuq0RBcIEkojnme4wVDoFt1EG93YOnqMuif76YGEl3iv9tYcESEeLNruDN6 LDbE8blkR3151tdg8IkgREJ+dK+q0p9UsGfdd+H7pni6Jjcxz8mjKCx6wAuzvArA0Ciq+Scg hfIgoiYQegZjh2vF2lCUzWWatXJoy7IzeAB5LDl/E9vz72cVD8CwQZoEx4PCsHslVpW6A/6U NRAz6ShU77jkoYoI4hoGC7qZcwy84mmJqRygFnb8dOjHI1KxqQARAQABzSZUb20gTGVuZGFj a3kgPHRob21hcy5sZW5kYWNreUBhbWQuY29tPsLBfwQTAQIAKQUCVo1liQIbIwUJCWYBgAcL CQgHAwIBBhUIAgkKCwQWAgMBAh4BAheAAAoJEN7/muRPME1TTfQP/A8U028LCMsxhCmg8KnL oaXk5iRhiS8bhQILSWS0wTGjnpyYIsOdL4TwLLMfFkCtSjsdQSOnu8RVP3nu1waC/6U2pWWS W26B4GwpHfq/mi/PZOBW6+tt0srwxVvuFNVN/uE5r7Girlc8QHQfNyYxZu4eTbl7MuIIwuys rCueJGgaDOGps7aeknQhSYIBsdV2CazuEa2T7v4KTsjNbHCesayUbl87tZoBcs5Cf1yeUjK6 ePSVZPszEQ9Z5iE7meU3+COIQZPvEhaYDx5qpHZjakWpb0AfOspIxgxRR3W+sutOKshbdNDy IhbYc9xDjOWooI+6lkNKIdAyqoqq387JndjUuXVYPM3lNY5MVprH8bO1CUzusuMFSB8SlMKq p2sUEiS3jBpSd5C3GKxYAOkhTZn1kyNB7CyBVU2R4II1R0aSJf2yxOmWrEboeFO/SZQAX5ji A7obQE44zVZlSIlFh/sm7ns2zxJYyafML5N9CA+5RWJ2QQUzzjgZkvTc2lBwvl+kAe5P23aS aWbJdEgjV6jwhzHfKtlIznqk/t0quVwEzhzfvzxK/8HL+di2aeg5YxPA7VrjDRLFRGiCUgV9 gAPlLR92LnUM3XUgdtCAlQ0xPY1qaxbqZcK04zGQu6HtcO7czIwLf5K/pjwQRlMxPIUDFcTx gl81owVskfEp6Y76zsFNBFaNZYkBEAC+8m2NNYbxIOqTodhtUPv2VpsoovMYUNLD47xF1m+T FryIe0cQ/VeWb9eOBLWyAAbUdE8LO8Qzm3u226/Z5UsWT7q/iQ7BZrcsIJHe+/BtJw7d4u7M 6s3EDznEdN1O1zw0wSVw6TcFVfi/Mb8eYLK9iG4YgUHfYl/JGqeZNyOsHwUmZtWYFhkG9pm4 rqjgz838zXSq/zArcVhLFjgH/wpRXMq/nPxIdvoF4AuSnodmSG/8TvtQq0wt0oPZfR7OQxtw qZQm1Slpmi9cu5nQokrdm/3VxNCtZyUfWckRjpX8GcNWhTx0/gMuaeq2Rs2nb7u8qQaE8Ket kdaOOeo7OwsiIPNTutaI4g1y1BsWTfwRGDQwvZ/atT8nzKw+Ni7bzj+mUbQXkjxB+Rv+aSLe BVYrdGOME66Ru5owTNOpB3elfqX5QfBkcU6uTO5syxYyC1JffwSY82Ac3rLKW3qE/xu3uSam 4i1lxWDnoOlyf4jgjC3XfUS+OiV2CbAWZ42Q/EZ+ilTu6arOSfSv5yQ1cgnX/CZ2A+Uaujjp oD/8w520lEjmVqx0FkPL9xH+uuY6aFzavmcqG6X23ooblnwYaa1lJND/5vnJ0dqnhOMl2JeK gnFgJEchkbts4CMFwDlwh06svU1tdCxqtftOPi5iR8KQAAUi7a+yYIeHq1l4vZhaEQARAQAB wsFlBBgBAgAPBQJWjWWJAhsMBQkJZgGAAAoJEN7/muRPME1ToGMQAN5eR7zVdNCRfNsY8bcw xqwTgBu5sugTBghHPRLfQGZOBBg/49iu/6qDu6Q/IBIXc1963GOtd0eOD1fjdtgNzP6WTvZY 6zzkNvcwZQpWBTlXJa2KqKzdqGyTPZSj0YlY23L461PelTuxdIxNv45pOk32yg83NTqhxBZu mlAuPCfFpyH4IEEEB0j+9WEZnzl9cBLzw3rVv9bEIixe5ykSmG8UHJ6FJ6cI2myru6uwzbOu n8DkNLspmZppoTpwzPCY/6iljBLUBzDDRD8rzEavva2IhzINkrAvNSW6VpBMSpUBgsEIKxrp AFS1ax5uXmwYGyFzOWy034Zz5fWi260qiFplzKCij8t7sCgzOXwEbIt76L1basrRMY7urJm8 4VM6MeG2mfa92FfrMeL0pnD5ONg1FIuleGlvvKdQdFnE4AlwGcKid5GUD+vNNj/pbZyUpe4r zBFsc21/8jXSlR6zJS4mgkNDIIBGiPny3tvKINMZ8VK00mR6INpd+NErd2LxwZ/DQ5ejVyVL 080CbiD55mxxhqkbd5fHSfdhvvXIIYN+nM/RFLwaQGW9g62iFWlqeNRXezkERDV5ahFqZMP4 YDdodn0nRVZYu2kaXfOclKPcH58HlrRb8pKTE3t/TNKGY3SmKoznH0QtM27TWeZ9R9RgTYiV zSNqP+QUNp6BotWI Message-ID: Date: Wed, 12 Sep 2018 12:16:16 -0500 User-Agent: Mozilla/5.0 (X11; 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So I'll add reporting of STIBP + fixup >>> the missing reporting of RSB_CTXSW for v6. >>> >> >> I anticipate that STIBP could affect workloads with a lot of indirect >> branches (see previous discussion with Andrea). We should have a >> knob for people to opt in or opt out of STIBP. > > Feel free to send a patch to that effect. Tim, are you planning on sending a patch for this? If so, what type of opt in/out are you thinking about, something similar to SSBD? Thanks, Tom > > Thanks, > > tglx >