From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx49dPr+1Cwy+9mV38ZCQ6d+1wwp/VD2fGGEJsUzeuCFsT9orSpdywFba4hOhQ56Kpu2Elfii ARC-Seal: i=1; a=rsa-sha256; t=1523892350; cv=none; d=google.com; s=arc-20160816; b=DTeOsl7KX4PrcEXfT5KdvsSMepqr94tfWm6xik62ULTwUE3B5/uEZ5SQRW7qo53pTk kiGx79djVfYwGLelLrlREUU79Hr/R3t3yAmY+ZN05XLQP3ElCbtVFGzttr8pSOKVsp5R 6+4LAAeec59wZfhvcI7feVrdYT94CCD5ERjT0yiz25v6lfa6e4qUbT279ElDhR9w1Gtn i6gDgXxnez2TgHO4WCsuvGEW35WusuxIL3vF2E65H6/puvIoJlpfg+yYm8A0gj4GVZOi dglOSOu4U1u+Fffr/gjz1SNuW6Ymn0EKNLRvDWL7wFSm5OaIXIO/GUiQVSaFbR7v8T7R ZWHQ== 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=GK2wtNYvu99snReQv/yOmwwXWYsOB6fIn7Q/P/8Qs78=; b=Wm4XuMNQl85SKVE+qZwfgv3/S5Pt/RPcGka7nY5JvJL0ODEpA9ezbWQZ7iVY/hzKms Heb9QDNtTRLX4rrMfXr9PvRKPm2dym2rE1gqHnOwaMHbvzhIRAXbnpWITV2+qpgk+I/O RtYYS2gl6dhQcG133uffWwoIpuJCy0J8+1sTX6ItA5p3X6APfayin+VOtraxO7PGTyFM JM8KJIG1nVmHt5poHjYyyHY195JLizzeOk3LW1IkUCKt0VDImO2aPG0zB1U8exuNIe7K wTp5QhevUGFnlOG396cOh1ZaqnrGVm+EOOPGkyF4FWBkV1t7LKW3HStXCN3W+XCf4/Nf QGKg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass (test mode) header.i=@8bytes.org header.s=mail-1 header.b=NPClk9yp; spf=pass (google.com: domain of joro@8bytes.org designates 2a01:238:4383:600:38bc:a715:4b6d:a889 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=NPClk9yp; spf=pass (google.com: domain of joro@8bytes.org designates 2a01:238:4383:600:38bc:a715:4b6d:a889 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 30/35] x86/ldt: Define LDT_END_ADDR Date: Mon, 16 Apr 2018 17:25:18 +0200 Message-Id: <1523892323-14741-31-git-send-email-joro@8bytes.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1523892323-14741-1-git-send-email-joro@8bytes.org> References: <1523892323-14741-1-git-send-email-joro@8bytes.org> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1597916945397412555?= X-GMAIL-MSGID: =?utf-8?q?1597916945397412555?= 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 d41d896..46c349c 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