From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 44001362142 for ; Tue, 20 Jan 2026 17:16:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=96.67.55.147 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768929413; cv=none; b=HoppYW1AWXHL2zTvCswKiOsOFxLdGz3+uxqjrJygr+3aEKZwBZGbjt0xs9nWYXcaE9QXVB05CYjkeZopfb0CcM52wzbIPYknNzgnnpK0Nr4BGjFOBLW+naaaHdnR7ig+UVKni7FYYLFaNgNTwW7y9DUuhxVLb6Hu0Rrsh+j3o5g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768929413; c=relaxed/simple; bh=57PSeLUmXWNPYEj8X1pOgrHAMXLnn0XGqNFSoCXkySo=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Dw3S58K5uaPWMD1zNZmnWlF8v4e0Li4e36MDcR9732tUTtqxHWLviiOi9Ey3AjvP2LsPX+3UBqau23oubsq15OxWnW02V5MOP4APpI3+2qs83rBdFdA0f3pr2d9KmiZtHBjkP/+sjQIzbPuMVbd47WZD3nAnG6g90QXW15yUaVA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=surriel.com; spf=pass smtp.mailfrom=surriel.com; dkim=pass (2048-bit key) header.d=surriel.com header.i=@surriel.com header.b=E5AaF8hJ; arc=none smtp.client-ip=96.67.55.147 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=surriel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=surriel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=surriel.com header.i=@surriel.com header.b="E5AaF8hJ" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=surriel.com ; s=mail; h=MIME-Version:Content-Transfer-Encoding:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=57PSeLUmXWNPYEj8X1pOgrHAMXLnn0XGqNFSoCXkySo=; b=E5AaF8hJduiYRX+tPTluvhIFVF Sl7htsV8uwOfKTs8s3ZHcOxRrTl42B3Cic4cFQ12nrNQD47bCY9Q6SjferRmjbJOXCXbHUE0e4PSu EV/vCvlW1Hqkaengdo40wWTRX3wGFo6Uet6LT0ilxRnKFnaRLEbDgo4QRCgAmwyMLtOZMwXnZPlU/ /fiCQLBJxp3sg/0jWgykK4nHXQuRKivOkrAr16y1IFsoKarKIMC6LVP9YaFf0+RmeAGIlK3Kay7GE lf9/C2R5g5S3VJ5713WCPZ9QPxN26rD0O5He/1cOMA4JZYJhxwMnE7OEuvzs8QgXWRU18aiBvPG14 BBMxmCJw==; Received: from fangorn.home.surriel.com ([10.0.13.7]) by shelob.surriel.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.97.1) (envelope-from ) id 1viFLG-000000001dt-1Kdh; Tue, 20 Jan 2026 12:16:35 -0500 Message-ID: <1784e0ffca8ebb52748a24d0327451678f18c048.camel@surriel.com> Subject: Re: [PATCH v2 1/4] x86/mm: Correct the actual size of available global ASID range From: Rik van Riel To: Hou Wenlong , linux-kernel@vger.kernel.org Cc: Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" Date: Tue, 20 Jan 2026 12:16:35 -0500 In-Reply-To: <30c6abf8d2a246cde256f943adaa7251ae09b2df.1768900340.git.houwenlong.hwl@antgroup.com> References: <30c6abf8d2a246cde256f943adaa7251ae09b2df.1768900340.git.houwenlong.hwl@antgroup.com> Autocrypt: addr=riel@surriel.com; prefer-encrypt=mutual; keydata=mQENBFIt3aUBCADCK0LicyCYyMa0E1lodCDUBf6G+6C5UXKG1jEYwQu49cc/gUBTTk33A eo2hjn4JinVaPF3zfZprnKMEGGv4dHvEOCPWiNhlz5RtqH3SKJllq2dpeMS9RqbMvDA36rlJIIo47 Z/nl6IA8MDhSqyqdnTY8z7LnQHqq16jAqwo7Ll9qALXz4yG1ZdSCmo80VPetBZZPw7WMjo+1hByv/ lvdFnLfiQ52tayuuC1r9x2qZ/SYWd2M4p/f5CLmvG9UcnkbYFsKWz8bwOBWKg1PQcaYHLx06sHGdY dIDaeVvkIfMFwAprSo5EFU+aes2VB2ZjugOTbkkW2aPSWTRsBhPHhV6dABEBAAG0HlJpayB2YW4gU mllbCA8cmllbEByZWRoYXQuY29tPokBHwQwAQIACQUCW5LcVgIdIAAKCRDOed6ShMTeg05SB/986o gEgdq4byrtaBQKFg5LWfd8e+h+QzLOg/T8mSS3dJzFXe5JBOfvYg7Bj47xXi9I5sM+I9Lu9+1XVb/ r2rGJrU1DwA09TnmyFtK76bgMF0sBEh1ECILYNQTEIemzNFwOWLZZlEhZFRJsZyX+mtEp/WQIygHV WjwuP69VJw+fPQvLOGn4j8W9QXuvhha7u1QJ7mYx4dLGHrZlHdwDsqpvWsW+3rsIqs1BBe5/Itz9o 6y9gLNtQzwmSDioV8KhF85VmYInslhv5tUtMEppfdTLyX4SUKh8ftNIVmH9mXyRCZclSoa6IMd635 Jq1Pj2/Lp64tOzSvN5Y9zaiCc5FucXtB9SaWsgdmFuIFJpZWwgPHJpZWxAc3VycmllbC5jb20+iQE +BBMBAgAoBQJSLd2lAhsjBQkSzAMABgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIXgAAKCRDOed6ShMTe g4PpB/0ZivKYFt0LaB22ssWUrBoeNWCP1NY/lkq2QbPhR3agLB7ZXI97PF2z/5QD9Fuy/FD/jddPx KRTvFCtHcEzTOcFjBmf52uqgt3U40H9GM++0IM0yHusd9EzlaWsbp09vsAV2DwdqS69x9RPbvE/Ne fO5subhocH76okcF/aQiQ+oj2j6LJZGBJBVigOHg+4zyzdDgKM+jp0bvDI51KQ4XfxV593OhvkS3z 3FPx0CE7l62WhWrieHyBblqvkTYgJ6dq4bsYpqxxGJOkQ47WpEUx6onH+rImWmPJbSYGhwBzTo0Mm G1Nb1qGPG+mTrSmJjDRxrwf1zjmYqQreWVSFEt26tBpSaWsgdmFuIFJpZWwgPHJpZWxAZmIuY29tP okBPgQTAQIAKAUCW5LbiAIbIwUJEswDAAYLCQgHAwIGFQgCCQoLBBYCAwECHgECF4AACgkQznneko TE3oOUEQgAsrGxjTC1bGtZyuvyQPcXclap11Ogib6rQywGYu6/Mnkbd6hbyY3wpdyQii/cas2S44N cQj8HkGv91JLVE24/Wt0gITPCH3rLVJJDGQxprHTVDs1t1RAbsbp0XTksZPCNWDGYIBo2aHDwErhI omYQ0Xluo1WBtH/UmHgirHvclsou1Ks9jyTxiPyUKRfae7GNOFiX99+ZlB27P3t8CjtSO831Ij0Ip QrfooZ21YVlUKw0Wy6Ll8EyefyrEYSh8KTm8dQj4O7xxvdg865TLeLpho5PwDRF+/mR3qi8CdGbkE c4pYZQO8UDXUN4S+pe0aTeTqlYw8rRHWF9TnvtpcNzZw== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-2.fc42) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2026-01-20 at 21:44 +0800, Hou Wenlong wrote: > As noted in the comment, the available ASID range for global ASID > allocation is '[TLB_NR_DYN_ASIDS, MAX_ASID_AVAILABLE-1]', which is a > close interval. The size of bitmap is defined as > 'MAX_ASID_AVAILABLE', > so the actual available size should be > '(MAX_ASID_AVAILABLE-1) - TLB_NR_DYN_ASIDS + 1'; otherwise, one ASID > will > leak. >=20 > Signed-off-by: Hou Wenlong Reviewed-by: Rik van Riel --=20 All Rights Reversed.