From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yw1-f179.google.com (mail-yw1-f179.google.com [209.85.128.179]) (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 E38F425F7A9 for ; Fri, 24 Jul 2026 03:03:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.179 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784862210; cv=none; b=MXhjvu9hfv6cug3NhXPb6W33GSu/onp2f+Xi7v/xzLaXva5ivUHDWPWQUZVtOGJD120wXQTKBp7pgW23qAxRMGKhjhBWSsiN9FsJMUvRXR4ufEDWV6iFoEvMx7t4EK5FZGNb4oJxdVKPyU7CXElPt2OPjiPTIfWoQAT+GA2y4B8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784862210; c=relaxed/simple; bh=PfRcJ7e4SQjqGNgWMgfzHaihMuw+SQv1skLt6o6AXzc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=s+4WH4aik/RLyYIL2fW7dQNvULJPuSV+NPq8baDr6GgYw4D1DAgYnDuxu0TJnSzvqkQ8TmOUDIB/uHmmkfXN6n4nBlFN4B9Bp6S+BBhE55o96UEyum0uAiI5HD6CmEGK3DJtZVpofnzYpv7e6DK9UAq477gmZjbjh17oUMMaqMo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=IqDdZx77; arc=none smtp.client-ip=209.85.128.179 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="IqDdZx77" Received: by mail-yw1-f179.google.com with SMTP id 00721157ae682-81ecf499af9so11550087b3.1 for ; Thu, 23 Jul 2026 20:03:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1784862208; x=1785467008; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=/3tybHNKnNM19dzAnuHiNMe1idD5JAAT4NAx0nOQDNA=; b=IqDdZx775HhLbKatZJsCbM2ywwm0Gn7BXO45uvth/i2zJWmPuYbtokV7MZFb0WH7rl uZq1z9ln8a65WzRoBwhMDnQwRzzl+mwalNKLYGLT/9D/dJj2cGl+Sx2yPfz0wMbT1Y6c /MYY4qkLcZIg5u/ha9w5FNZ/L83UYpLocgJJuf1PSDrA4krvnDMDyNypsFu5D8lFIsKz SO/4q22qw+xpnayS3vg7ZRK5AGgDtCHFqak0o9O61jy7kDnspgM/vxJE/njNOPAI/pgY 4YZTnOIcyCwsjy7T1lACFTMpuHjSTBmtie10eYpdtzmv5LQogEbx8QoFXgPmvWdOcmMc EVeQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1784862208; x=1785467008; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=/3tybHNKnNM19dzAnuHiNMe1idD5JAAT4NAx0nOQDNA=; b=l0Zwil+np4b2H1VGMj1M66Mug2YlJ1qGm4zsb5+MrjBmQ2fh72ne423ZYKS9D72osv cUPC9d/0/gqir52YKkBQK0s6IacnTL7Mt9JUMsz37AtgXbW5Jgv7/YcL3EdXWqKD8Zc5 XgMQSkSkFUeyhctPJiFtk/YqSHbHSVtZPrgAHYuQggq2tIdO5w+PJMdKKYikJGPL0Uzr oBrqYrWr5rf3NMw5Gw7JJzNTcjaEJbO1xzqtmTFv8g81Ct6par15d45FFo4mtsqmcByc KeOK9fa8zYxu4w3ly967wM8Dugcuhc6HAW15BE9Z+3a0Uyor2jvyrs6iNuzSOEwSDteV P2bw== X-Gm-Message-State: AOJu0YzOAKWztRiFCxqKIXv6FZGctPLJ9m8BJG4ItxQJ1EWJ6ut1Nq4S 3+hiJvvgHnwNwUkFF61rITq177JlwHXc2ww4lvctppuFQH0P1gJyDATjx8Cw X-Gm-Gg: AR+sD1121flz7pAd5914+bIj/hN4194u8jAg+SsJpyQqylLmZ+m9yBFEYCCbtR2UQ/l FD67GQ0/7affNG9b6wj1s3f9W8bbv0DKgh/MXhXhpV/lTyw8aGfL4q1NQ0jVI9r9ZqX9JMeBDEd W/2OFN9Y7etLlUxa2vbEmna7LNJQOlt0IdA1OqSDgYkuCmzwfmANPb96txzJ8a4AHSNMOh1342h GUS9+LJp9huXSgItntmQVghuJZgUKgNbIlhbzGnvIGFCRch4QLNgEiU9xSBvRQITFd7/gxQGSTP /wGWCGu+WLEQIhAHSSv4ImqCbn6m4VwsijgMA0Ea8LUA8dx0MYljPLMqEq5ROiPPFLLHgPQtJ22 ea9xhvDLMq+GFMoXxpOpNW9Y4BUcAfnrdQFRZOkUSHO3lf3o2+pWTHOscIUE= X-Received: by 2002:a05:690c:6501:b0:804:a2d5:1d32 with SMTP id 00721157ae682-81f4c2cb2femr18372537b3.36.1784862207943; Thu, 23 Jul 2026 20:03:27 -0700 (PDT) Received: from citadel.lan ([2600:6c4a:4df0:2c10::1dba]) by smtp.gmail.com with ESMTPSA id 00721157ae682-81f33c397c9sm37379477b3.14.2026.07.23.20.03.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Jul 2026 20:03:27 -0700 (PDT) From: Brian Gerst To: linux-kernel@vger.kernel.org, x86@kernel.org Cc: Thomas Gleixner , Borislav Petkov , Ard Biesheuvel , Juergen Gross , Tom Lendacky , Brian Gerst Subject: [PATCH 1/5] x86/sme: Clear decrypted BSS separately Date: Thu, 23 Jul 2026 23:02:52 -0400 Message-ID: <20260724030256.232690-2-brgerst@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260724030256.232690-1-brgerst@gmail.com> References: <20260724030256.232690-1-brgerst@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The decrypted BSS section needs to be cleared after it is remapped as decrypted memory. Separate it so that the normal BSS section can be cleared earlier. Signed-off-by: Brian Gerst --- arch/x86/kernel/vmlinux.lds.S | 2 +- arch/x86/mm/mem_encrypt_amd.c | 3 +++ 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S index 2438b89a4620..e64c797e06c7 100644 --- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -365,9 +365,9 @@ SECTIONS *(.bss..page_aligned) . = ALIGN(PAGE_SIZE); *(BSS_MAIN) - BSS_DECRYPTED . = ALIGN(PAGE_SIZE); __bss_stop = .; + BSS_DECRYPTED } /* diff --git a/arch/x86/mm/mem_encrypt_amd.c b/arch/x86/mm/mem_encrypt_amd.c index 2f8c32173972..d39e1e29bcb9 100644 --- a/arch/x86/mm/mem_encrypt_amd.c +++ b/arch/x86/mm/mem_encrypt_amd.c @@ -479,6 +479,9 @@ void __init sme_early_init(void) if (!sme_me_mask) return; + memset(__start_bss_decrypted, 0, + (unsigned long) __end_bss_decrypted - (unsigned long) __start_bss_decrypted); + early_pmd_flags = __sme_set(early_pmd_flags); __supported_pte_mask = __sme_set(__supported_pte_mask); -- 2.55.0