From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f73.google.com (mail-wm1-f73.google.com [209.85.128.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9A90D1EC013 for ; Thu, 20 Mar 2025 15:55:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.73 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742486124; cv=none; b=CHpUC16pxvCuITWHInjdhB7G3xW9rAtKjULtSm0ut5Gj8k3JmzvQxcfhJDr1GK87wsRITAdfvPbqkU18O0SP9fmXIcm4O2xXWBX4vHpQPED3JTwSbEsMdec5ypeHzUfSjS6PJcFGhHrCHm0xgMPswzqaxMYgqX6E7aRVq1ek6O8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742486124; c=relaxed/simple; bh=HJtqYAcwATaJYemmG3x2qLIknVjNk1biuCODLgnKDjI=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=J78US0+hf5fuq/Df90PpTgayUSH1Y8eq+uFHXDGy4EA5aZNJO38XgyExU22vg5UsggDrLkp0DyiYwe7F6Kwn5NTsT1+EPdsedx3YxCweWaRvINOUMbm2du2mtaBB6fsLxxCZGCgzxrTT3QmCd+cA1ErM0n591X8dBlT6Y4K5uZA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--jackmanb.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=PFPfBrxQ; arc=none smtp.client-ip=209.85.128.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--jackmanb.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="PFPfBrxQ" Received: by mail-wm1-f73.google.com with SMTP id 5b1f17b1804b1-43d01024089so6955695e9.1 for ; Thu, 20 Mar 2025 08:55:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1742486121; x=1743090921; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=vcc0p+m6ptiz1K0U14vYh5p8Vi322BofjVMo05sdNMM=; b=PFPfBrxQ4yAC5NsD7cj8jKS7W3+km6ucGUjawCVICRsgpjUbRQNGNt6qg+0V5edhJ1 9kYNrB6xNeOzZdqXqW/jT/A3XrAi+pD+WpYcKiOXls3KM58wXk4U/nZwjBHOc8Jr7ZM2 wdXiHA9v0riHzg/huH4FTSMHE0cN5vMNJ7z2VbCpX+aL61i8u2xp/bL+kYcrvZyoP/Qv Ar3QnC2XoSx/LdaXNDLq8mLmeyJENfcENfWWpUsoFTIfCHgnopXXD0qLfXsAu31WI/rj blrbzI4AYIn5R1LhbR8bh6o5Rka2wXkmLSOaGWnr3KjCArMC/IjDn1Dyn1+3gsJK5gnX M3Vg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1742486121; x=1743090921; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=vcc0p+m6ptiz1K0U14vYh5p8Vi322BofjVMo05sdNMM=; b=XJGEunABdrDxGpdQPeaT+nwq1gCRD4IjZ8dTRQIPIsrj1Xa/oo4QTu+l50t7giT4AF Y1iGsmjdqzJBivljGN7weE6xITD2830+/OZRrTTALGuRqfcpXEUq/scSPrFM9H6SSNbW LpLmTLk54Aj+lVxORqyw3Jj3jvP7HtdqyG0Anff+G8gFbZyn3+rjYeQ/fWrAEzm+AA62 qfDuKfHjzxpfWcPi++nFV2NTXeEUDVCezsjAEevNabM5DU2IcyWa0OvO/INxUgaihTBh zxfZIc9eMWaKAZTKA6evLOJil0VToQeMpfrLE8hfYXdmBbskbBknAUuatEnIERiMu+Gi Briw== X-Forwarded-Encrypted: i=1; AJvYcCXWimEC7x/WfvJTT9bk0z6qBmu78xYRryFGe/TF/z1EOAoqpT5t4QzBSIeJHPtSy7036okTT8S4xFZuT6c=@vger.kernel.org X-Gm-Message-State: AOJu0YwL7oWrivObtQpAzqDTyImcqzLy2QQbeJX1XLhRJiPiU8T7zY4x Xr5/nC8qKiT/TFJvIdUSiDgVgVZSiBBP20VictxsGQqkyy9cGJtvYSdKxWaQgZdUUamHx4Dj5Qv BcY5xB/tnXg== X-Google-Smtp-Source: AGHT+IEOByC6pEoxVmRfYb9u/TzapHyajZ5rs3x/xhPHpW7ZWckNMUPvZfQzvFAPdcBAY1ySv9n0piLX7/zoPg== X-Received: from wmbeq10.prod.google.com ([2002:a05:600c:848a:b0:43c:ef7b:ffac]) (user=jackmanb job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:3845:b0:43c:f969:13c0 with SMTP id 5b1f17b1804b1-43d438a66afmr75908535e9.29.1742486121041; Thu, 20 Mar 2025 08:55:21 -0700 (PDT) Date: Thu, 20 Mar 2025 15:55:19 +0000 In-Reply-To: <20250110-asi-rfc-v2-v2-25-8419288bc805@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250110-asi-rfc-v2-v2-0-8419288bc805@google.com> <20250110-asi-rfc-v2-v2-25-8419288bc805@google.com> X-Mailer: aerc 0.18.2 Message-ID: Subject: Re: [PATCH RFC v2 25/29] mm: asi: Restricted execution fore bare-metal processes From: Brendan Jackman To: Brendan Jackman Cc: , , Content-Type: text/plain; charset="UTF-8" On Fri Jan 10, 2025 at 6:40 PM UTC, Brendan Jackman wrote: > noinstr void irqentry_enter_from_user_mode(struct pt_regs *regs) > diff --git a/kernel/fork.c b/kernel/fork.c > index bb73758790d08112265d398b16902ff9a4c2b8fe..54068d2415939b92409ca8a45111176783c6acbd 100644 > --- a/kernel/fork.c > +++ b/kernel/fork.c > @@ -917,6 +917,7 @@ void __mmdrop(struct mm_struct *mm) > /* Ensure no CPUs are using this as their lazy tlb mm */ > cleanup_lazy_tlbs(mm); > > + asi_destroy_userspace(mm); We can't do this here, it takes a mutex. The lifecycle of struct asi needs to be reworked anyway as Yosry discussed here: https://lore.kernel.org/linux-kernel/Z9sRQ0cK0rupEiT-@google.com/