From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x227aMl9fPP6rJGPy1lUKLIMs65ZNPjXCsHGUZsTpPWYJlShTvo3KJQsMDGc8RFc+hS9fhHpT ARC-Seal: i=1; a=rsa-sha256; t=1518168359; cv=none; d=google.com; s=arc-20160816; b=KNlUZj6oLLl8oa4M6QXb4F8sfm/Tpj5BnxTy+pBQfFx+J6pjfosbdKfme5v/XSRqvM H8dq9jZk1KgXehMFrGCYRW1Y6bZb9wVOBz/mDTG9vcRe/ibFVZbULErdRewrKQw56uWU 58YsYvG1k1KHQ7Ku9wTQKZQdYCuIHajq+HTsI083weaaUF1wGrqDoGcu48WoMec1xjXq FSq+y7XQaEc5T1YCFHP/Uy6MvyLVOecckeYPkptSIz0ii2fuBpbxh7dNID2eSjcsy2bK LmjEGTnyrY89sdZ9idFUTv+4aKJZ0jKpLGzr/0tj4TRLWW0S8zYiCf2JhpjOQiwYRlOj Rc9A== 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=59MhfMU72c18caWRDgmz/TzHGVoGLjlnnaF4XkAcR74=; b=oJuYjheDwJqdNScjjRtggh4JI6jEsVnV/jGSSYYUcKVZ9iqlu7Sor86mkfbrXkPNCk bbuEyvZi4mtpri9GsrME0zWmnLQ89/o2eM0p5N7Qh9a/U1/V2dqqLrEIYqrPT85crUbS 76taYz+EruD7xSKqZzRTBD07itzHXTdFqMUzUPKkMmC+3nO81qQ5C2jscgKS/uehkVty bB2Fb2kB0jz7k4LFEmZuiRwB2nF8hhfL7vSv1z0EaFw9O1U+nvPjNbGDJyGo1lCIJyd0 BV5viISURQ5lRmD9sRDSTDXYPvTShjbIKc4vghtkRXAbfPwL8BcqqIXX/Q/NSywbB8vj YEQA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass (test mode) header.i=@8bytes.org header.s=mail-1 header.b=JNTvl4l6; 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=JNTvl4l6; 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 , jroedel@suse.de, joro@8bytes.org Subject: [PATCH 14/31] x86/pgtable/pae: Unshare kernel PMDs when PTI is enabled Date: Fri, 9 Feb 2018 10:25:23 +0100 Message-Id: <1518168340-9392-15-git-send-email-joro@8bytes.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1518168340-9392-1-git-send-email-joro@8bytes.org> References: <1518168340-9392-1-git-send-email-joro@8bytes.org> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1591914906203794040?= X-GMAIL-MSGID: =?utf-8?q?1591914906203794040?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Joerg Roedel With PTI we need to map the per-process LDT into the kernel address-space for each process, so we need separate kernel PMDs per PGD. Signed-off-by: Joerg Roedel --- arch/x86/include/asm/pgtable-3level_types.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/pgtable-3level_types.h b/arch/x86/include/asm/pgtable-3level_types.h index 876b4c7..ed8a200 100644 --- a/arch/x86/include/asm/pgtable-3level_types.h +++ b/arch/x86/include/asm/pgtable-3level_types.h @@ -21,9 +21,10 @@ typedef union { #endif /* !__ASSEMBLY__ */ #ifdef CONFIG_PARAVIRT -#define SHARED_KERNEL_PMD (pv_info.shared_kernel_pmd) +#define SHARED_KERNEL_PMD ((!static_cpu_has(X86_FEATURE_PTI) && \ + (pv_info.shared_kernel_pmd))) #else -#define SHARED_KERNEL_PMD 1 +#define SHARED_KERNEL_PMD (!static_cpu_has(X86_FEATURE_PTI)) #endif /* -- 2.7.4