From nobody Mon Nov 25 12:35:55 2024 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.13]) (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 29A061DED6B; Mon, 28 Oct 2024 16:12:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.13 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730131933; cv=none; b=mMP5zJT3PPDJHJhlmbqeXNLm6CukP/ej2CbgO0NPmh8b14bGgfGb5oQ1QVsUpy3VWwhOaRukR9+55MSqbGn2JaOBN/YWDW1D4X2blGJa/7nqv8cmS5E2YdJIvP6YOPpmxz6Jiz/rd/dUO6+xt9Q9VS9S7R1poGDPtgBxjlI9o+o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730131933; c=relaxed/simple; bh=93VnYKIFxvP/5UMU/Ce687kY9FqRNs9gkUoibkzkDyU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NejWv2s7KXcSpXtdQ9kLFrnsS1OqRdIUzJU0YmJT9oiP7smTPZl6EhRxdfnwq/VCymIBNd/YMPhsO3KZF2rRtBpwfCn3i5NiAUdz4+n5cZBWiPIsYpYfX8YxcRuHV998I370AtxVZ/hu4PxxCB/4ENFjzHvIEIn1YGGAlmVa46Y= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=U/1prSLy; arc=none smtp.client-ip=192.198.163.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="U/1prSLy" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1730131931; x=1761667931; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=93VnYKIFxvP/5UMU/Ce687kY9FqRNs9gkUoibkzkDyU=; b=U/1prSLyI9C/zuZfTJzcyWyffnwyuxMZPLgKn4jtqEGc8W651x0KYc5m eGuSRDPGsRK9b5mIVlMqon1LZDlv1rk9EiBMGV+0kzkim8/HRi04tbTzE /n02mDPLBxrwM7q28hE3PgINpNiKsixKgew6tl+HEAMhdV4jbV4Gp0M6d Fba/WHmvqEOVZ5VeI4hYrXFfCmRomX7PqFusPY5/p4eWntSz2rWVavipb 4eDwmtJEm3w5i1hkgSXd+oVBh1G9Wn6eI2OYGJ+SSj8Pu1Hftitcaw+qm vgGSJJmGs2E1JKI2OpKsajfveBlBN6wcCtL5XjOJ26fwTF0ovgrpmgoaY w==; X-CSE-ConnectionGUID: fwQqsWwJSNeBTSJwJMSPIQ== X-CSE-MsgGUID: Wy2v1xv9RMCPCUW172GsMA== X-IronPort-AV: E=McAfee;i="6700,10204,11239"; a="32594259" X-IronPort-AV: E=Sophos;i="6.11,239,1725346800"; d="scan'208";a="32594259" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by fmvoesa107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Oct 2024 09:12:11 -0700 X-CSE-ConnectionGUID: KTVTLQ8eSnS72cz6fo1PsA== X-CSE-MsgGUID: AEy7ZPIVTkGNCkEvhm3plQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,239,1725346800"; d="scan'208";a="112478747" Received: from black.fi.intel.com (HELO black.fi.intel.com.) ([10.237.72.28]) by orviesa002.jf.intel.com with ESMTP; 28 Oct 2024 09:11:59 -0700 From: Alexander Shishkin To: Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Peter Zijlstra , Ard Biesheuvel , "Paul E. McKenney" , Josh Poimboeuf , Xiongwei Song , Xin Li , "Mike Rapoport (IBM)" , Brijesh Singh , Michael Roth , Tony Luck , "Kirill A. Shutemov" , Alexey Kardashevskiy Cc: Jonathan Corbet , Alexander Shishkin , Sohil Mehta , Ingo Molnar , Pawan Gupta , Daniel Sneddon , Kai Huang , Sandipan Das , Breno Leitao , Rick Edgecombe , Alexei Starovoitov , Hou Tao , Juergen Gross , Vegard Nossum , Kees Cook , Eric Biggers , Jason Gunthorpe , "Masami Hiramatsu (Google)" , Andrew Morton , Luis Chamberlain , Yuntao Wang , Rasmus Villemoes , Christophe Leroy , Tejun Heo , Changbin Du , Huang Shijie , Geert Uytterhoeven , Namhyung Kim , Arnaldo Carvalho de Melo , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org Subject: [PATCH v5 13/16] x86/traps: Communicate a LASS violation in #GP message Date: Mon, 28 Oct 2024 18:08:01 +0200 Message-ID: <20241028160917.1380714-14-alexander.shishkin@linux.intel.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241028160917.1380714-1-alexander.shishkin@linux.intel.com> References: <20241028160917.1380714-1-alexander.shishkin@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Provide a more helpful message on #GP when a kernel side LASS violation is detected. Signed-off-by: Alexander Shishkin --- arch/x86/kernel/traps.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index bae635cc6971..89e35ab8dbd9 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -537,7 +537,8 @@ DEFINE_IDTENTRY(exc_bounds) enum kernel_gp_hint { GP_NO_HINT, GP_NON_CANONICAL, - GP_CANONICAL + GP_CANONICAL, + GP_LASS_VIOLATION }; =20 /* @@ -573,6 +574,8 @@ static enum kernel_gp_hint get_kernel_gp_address(struct= pt_regs *regs, if (*addr < ~__VIRTUAL_MASK && *addr + insn.opnd_bytes - 1 > __VIRTUAL_MASK) return GP_NON_CANONICAL; + else if (*addr < ~__VIRTUAL_MASK && cpu_feature_enabled(X86_FEATURE_LASS)) + return GP_LASS_VIOLATION; #endif =20 return GP_CANONICAL; @@ -696,6 +699,11 @@ DEFINE_IDTENTRY_ERRORCODE(exc_general_protection) char desc[sizeof(GPFSTR) + 50 + 2*sizeof(unsigned long) + 1] =3D GPFSTR; enum kernel_gp_hint hint =3D GP_NO_HINT; unsigned long gp_addr; + static char *help[] =3D { + [GP_NON_CANONICAL] =3D "probably for non-canonical address", + [GP_CANONICAL] =3D "maybe for address", + [GP_LASS_VIOLATION] =3D "LASS prevented access to address" + }; =20 if (user_mode(regs) && try_fixup_enqcmd_gp()) return; @@ -735,9 +743,7 @@ DEFINE_IDTENTRY_ERRORCODE(exc_general_protection) hint =3D get_kernel_gp_address(regs, &gp_addr); =20 if (hint !=3D GP_NO_HINT) - snprintf(desc, sizeof(desc), GPFSTR ", %s 0x%lx", - (hint =3D=3D GP_NON_CANONICAL) ? "probably for non-canonical address" - : "maybe for address", + snprintf(desc, sizeof(desc), GPFSTR ", %s 0x%lx", help[hint], gp_addr); =20 /* --=20 2.45.2