From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx4+dRuirQDMe55FtZ+71P4ArYt6dA/0MSXMyRi9J2asGh6pP0A2912Dxbdl8xAE5QhlNQdD2 ARC-Seal: i=1; a=rsa-sha256; t=1524498480; cv=none; d=google.com; s=arc-20160816; b=zZN694kdUPuXj+OTuI7IWH4DeYsbt5CtPEfuzGPIeIKnkeowL806wrdLxLnqiuXcUg JZt7bGJQ/HpM6auEFgbH0oGUkmt36zQVhspwr69nvhu7vtG84LQyH0ZqileNH0jdP1nf 9WSXG2/d1tLq9DptBjiWJQdHERoK3EGriuvHtXUUguPesNonpKPgyAg19S78G6/bJysq Y4HiL/MFPk3yD0dTeClITRor5B4sFWKll3CE5ntspKGvvFpuO3/4xzPS8cHuzPXE0n7U FMKMeLqVBfH/CzT5YhwWxmUj7IW9+dcZ2nxZHhCWnscKXkYmJoTEHfLKcX629XqqvGGq 1ozA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature:arc-authentication-results; bh=sXfYIJU/ruaJY13W/nJrbm70x64qAsmvxR7tt1NAr70=; b=z1u9h8y224BzTkp/poyLUlfWVYAD0Dkhx2vgnkzj9C7Ttl8uaxU1UP368QJDwv4E74 AxZqOSziHw5iX0H+78JZc7bTBu1dFY5G/JtmfMtcfEdpMtCPr/DyTuE/a3eicm7jQEoV YT0HUx92um2lJIVxsB0Uz1eTRWjsSuSj9ylCILqJC8fBZo07lAiaFaHfTDFgHFlztQhy ple7/jJkx6sn7bZouD1fmHunwdCl/pHMGpGlDTMt6SkT3O4Uv6oysMhqDEF4UIRrooLV yx4ckLMNuJh7BtZXWHM0orz6f1wOk1TqhCea0Cd+Y3timGUiMTukitojV2Ov4gPKYf0F dInw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass (test mode) header.i=@8bytes.org header.s=mail-1 header.b=XDwGuoFA; spf=pass (google.com: domain of joro@8bytes.org designates 81.169.241.247 as permitted sender) smtp.mailfrom=joro@8bytes.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=8bytes.org Authentication-Results: mx.google.com; dkim=pass (test mode) header.i=@8bytes.org header.s=mail-1 header.b=XDwGuoFA; spf=pass (google.com: domain of joro@8bytes.org designates 81.169.241.247 as permitted sender) smtp.mailfrom=joro@8bytes.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=8bytes.org From: Joerg Roedel To: Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" Cc: x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Linus Torvalds , Andy Lutomirski , Dave Hansen , Josh Poimboeuf , Juergen Gross , Peter Zijlstra , Borislav Petkov , Jiri Kosina , Boris Ostrovsky , Brian Gerst , David Laight , Denys Vlasenko , Eduardo Valentin , Greg KH , Will Deacon , aliguori@amazon.com, daniel.gruss@iaik.tugraz.at, hughd@google.com, keescook@google.com, Andrea Arcangeli , Waiman Long , Pavel Machek , "David H . Gutteridge" , jroedel@suse.de, joro@8bytes.org Subject: [PATCH 32/37] x86/ldt: Define LDT_END_ADDR Date: Mon, 23 Apr 2018 17:47:35 +0200 Message-Id: <1524498460-25530-33-git-send-email-joro@8bytes.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1524498460-25530-1-git-send-email-joro@8bytes.org> References: <1524498460-25530-1-git-send-email-joro@8bytes.org> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1598552518374636074?= X-GMAIL-MSGID: =?utf-8?q?1598552518374636074?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Joerg Roedel It marks the end of the address-space range reserved for the LDT. The LDT-code will use it when unmapping the LDT for user-space. Signed-off-by: Joerg Roedel --- arch/x86/include/asm/pgtable_32_types.h | 2 ++ arch/x86/include/asm/pgtable_64_types.h | 1 + arch/x86/kernel/ldt.c | 2 +- 3 files changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/pgtable_32_types.h b/arch/x86/include/asm/pgtable_32_types.h index 1fa76c9..6d5f795 100644 --- a/arch/x86/include/asm/pgtable_32_types.h +++ b/arch/x86/include/asm/pgtable_32_types.h @@ -53,6 +53,8 @@ extern bool __vmalloc_start_set; /* set once high_memory is set */ #define LDT_BASE_ADDR \ ((CPU_ENTRY_AREA_BASE - PAGE_SIZE) & PMD_MASK) +#define LDT_END_ADDR (LDT_BASE_ADDR + PMD_SIZE) + #define PKMAP_BASE \ ((LDT_BASE_ADDR - PAGE_SIZE) & PMD_MASK) diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h index 355b488..f78ded7 100644 --- a/arch/x86/include/asm/pgtable_64_types.h +++ b/arch/x86/include/asm/pgtable_64_types.h @@ -104,6 +104,7 @@ extern unsigned int ptrs_per_p4d; #define LDT_PGD_ENTRY_L5 -112UL #define LDT_PGD_ENTRY (pgtable_l5_enabled ? LDT_PGD_ENTRY_L5 : LDT_PGD_ENTRY_L4) #define LDT_BASE_ADDR (LDT_PGD_ENTRY << PGDIR_SHIFT) +#define LDT_END_ADDR (LDT_BASE_ADDR + PGDIR_SIZE) #define __VMALLOC_BASE_L4 0xffffc90000000000 #define __VMALLOC_BASE_L5 0xffa0000000000000 diff --git a/arch/x86/kernel/ldt.c b/arch/x86/kernel/ldt.c index c9b1402..e921b3d 100644 --- a/arch/x86/kernel/ldt.c +++ b/arch/x86/kernel/ldt.c @@ -206,7 +206,7 @@ static void free_ldt_pgtables(struct mm_struct *mm) #ifdef CONFIG_PAGE_TABLE_ISOLATION struct mmu_gather tlb; unsigned long start = LDT_BASE_ADDR; - unsigned long end = start + (1UL << PGDIR_SHIFT); + unsigned long end = LDT_END_ADDR; if (!static_cpu_has(X86_FEATURE_PTI)) return; -- 2.7.4