From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AG47ELvsIOPgrJ3SRfBmj19POE0xP1E+6jDm1IfSWNo0InC3AKxODU6wriFw21YvcVjA+WrUq4fF ARC-Seal: i=1; a=rsa-sha256; t=1521228605; cv=none; d=google.com; s=arc-20160816; b=nQit5+c6ZHaEcY3fxH7E1HjQb+Mfx/CxoW5kcZRgt5BbRO+pri9s/YcIrCovd9VIBS ROKsiGN74MljcQZwAlVCF2oSZxJiODkO4cMPOk+co0kzdKmXTG2rlEjPCoGkMbpw9tCI CwqriIEK3uc1V81wvK9bZmZsPVsV9xgSyD6FCZpW9GjzrFxWYMRqAqJK2xRxU7Q4zF8i KfL1+xfF8xMX3MVeaedtYYD85xCS98Bvx6efodg/mXu18URvi1xp9/4dJVKmjWFyKd/d ksDsTfe4eUjzB90agVw+UTYF7YK+mZOqJLgifVafC+z5cKqzhYOaATp0Z85aD6C7+a9Z b5FA== 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=ty6r//qm3f8CSJcprqjpfvR+JMcLasXJdBTa+LG/P9dgJ5c3QPk2706kMD5MOEzw8q zMzYDQ38/VJAHMYMBaPClVxunh8P51VLNm7s4QLxYKAT++uSCu6Llvc2zsHPuxpEmkGO 1e5h/stsQ+r6by5d7eGhXE7AlFxgNCqxYFsIIvZRIdu28i0aB6XLb8q+AGoF3iPYivNG DlpP79GpWZsL+BwOfqaZ2U4oxbHCKKo6AvgsOSeC7qoQWagslRmxIvZ66dniH+Ovpiw3 yUtyjlKtt5uX41p9iD003LLDB4kH5qEhfAqRdkklg+Eil5i9Wfsm/whtNF/LgbDVpBD2 IMlg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass (test mode) header.i=@8bytes.org header.s=mail-1 header.b=OmD+Qruy; 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=OmD+Qruy; 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 , jroedel@suse.de, joro@8bytes.org Subject: [PATCH 16/35] x86/pgtable/pae: Unshare kernel PMDs when PTI is enabled Date: Fri, 16 Mar 2018 20:29:34 +0100 Message-Id: <1521228593-3820-17-git-send-email-joro@8bytes.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1521228593-3820-1-git-send-email-joro@8bytes.org> References: <1521228593-3820-1-git-send-email-joro@8bytes.org> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1595123806464996100?= X-GMAIL-MSGID: =?utf-8?q?1595123806464996100?= 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