From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx4+dlxD6yXVxFT24FCFIdb/CWtAGIyxZUzowzLSC7j2n3pMEbgH5aSxPzy+4GrLP2nChVgYg ARC-Seal: i=1; a=rsa-sha256; t=1524498472; cv=none; d=google.com; s=arc-20160816; b=BrbTS8sCmHXpgFTs1hA9F5xUIcR5lTAyVYb8e5Dmo3XHLgVwvV335jOjvVH+Ro3GMz HrHmwuO+0HsYQaokbU1P2JatW8Yf+cj3cBfATBP8jsd8WOzhQKiVlGlYUyFRgGiH/Fa4 +ZATwVkqbGnplvFGmSlSfQeaXqDwY2hK2AqwEwHuLxjE+IpQgq0lT2zH5vLoiyFBVjs5 SdplkWwlzAJGl7Bt7LCmStJrnOW/bPI+tvCNXbgWEOxzyFYS+xrBgxWlV3CjAiAt6Fqe ZcLWjTy/oIJkAWe2Cd/VPTupEbLs++UmdUNk1Thv2KN4XBPJLsjce7cyxQoSiS5N7ryx DsiA== 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=D6bfzXSQQlGkwyQKXEaTJa7boj/hhQSej8rCiOgeTSWjAhA+Fq3lDmkJtswMBUWYC1 7yUyduHlUikrzLf2K4qFn2FVr36eLtoBoSQQqnZGEfJA9wyTz7DFW3aBOZ0GZ02R2gXu 22mcm4/8I6k8Vgi5cftbygyUUwYbQ1KgOKaJ2B3dNNKTBVXYd4LQT6iIkrhGPMFTwgqr PZD9s3QCrIzGiSHvBVhLZsVNA/07NX2/vjqX9ctXrXWDmSh8RW6raRgvzmPzDezPN1Yl QLZo2CUHtmrRuOEKrRs/w24jvG5jA1qa5a7KqJgGqQTKE11K8tecD1/CnnkNnWIqINNH b6Xw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass (test mode) header.i=@8bytes.org header.s=mail-1 header.b=VAuBXDh6; 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=VAuBXDh6; 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 16/37] x86/pgtable/pae: Unshare kernel PMDs when PTI is enabled Date: Mon, 23 Apr 2018 17:47:19 +0200 Message-Id: <1524498460-25530-17-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?1598552510284017233?= X-GMAIL-MSGID: =?utf-8?q?1598552510284017233?= 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