From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx4/IigrcI6Q8UWtd0F9qmf5kwbZS4Wtm7CeYLPboxMNYYL1JcSj7/JJV0XTG/Y+yiLnO3CXi ARC-Seal: i=1; a=rsa-sha256; t=1523892346; cv=none; d=google.com; s=arc-20160816; b=q/T6zhWpZMzgG/1jDBxqB6baGBSw6DmJ4oXsz1JDAW10ylfnCxxsRCKp9U1qZdug60 p+EEOK/G3oa9waAzwe9Q7AiDhys7uQDIkbJRGGYdv9gHeaakmY1x9lOAKHVVNJKYwPs9 36jrbRp+OxtZL/j90pLQy2jUaNlqEZJcXs0HTBNEXFX5lf7nBRs2ByHYefXKYKMxNCHk 4DZ2+NX0f2wpc6mEwqzXRrsu4AjxC1kqw0qEeuRfy0C+jgiRGIBPJk57hfLgkn9lSTNQ /LoLzFpHbTG+esg8QR9zHXT5f8cqQFE+0r45WTXTEazMrDzA828SelkIN9bgG5tq4zkN YSWw== 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=S4MgOOtbnkkfJuMRU2k7i/vCCmzXOxdDizUjf0gP0lA=; b=HiuNEPgGa/8NQ6q3IJldpUOZWc2dxBzxT00mNjp6AeORjre5LuIoshY3/lbg3WCJfV qCJj5JJOJJ1ZRzhR0azzTJ2iQjyGC13dVp1PWley/4mCmKNwnAquTgqLpjQb7pgh04dh bPFxLaGY90efD+uNVsS91G7n3l+KmWpsp2PRKDdxxwM5CrmseRnIgi4XwAPF0e9o1LcP TdYvELNLlk1ByRpfFV7s/PpXvExm9Q09az06UliyAi9j6bvHpRk6kMTu9vQZlvjl1rct u8FrXvrkUKrBD5FfAzIPEscTyoB0ZC6Qop4WyojNkVSYxd/b1X6MLCRhwgoK9QPfPtf8 om7w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass (test mode) header.i=@8bytes.org header.s=mail-1 header.b=DUYEXDmh; 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=DUYEXDmh; 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 16/35] x86/pgtable/pae: Unshare kernel PMDs when PTI is enabled Date: Mon, 16 Apr 2018 17:25:04 +0200 Message-Id: <1523892323-14741-17-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?1597916940910831666?= X-GMAIL-MSGID: =?utf-8?q?1597916940910831666?= 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 6a59a6d..78038e0 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