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From:   Joerg Roedel <joro@8bytes.org>
To:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@kernel.org>,
        "H . Peter Anvin" <hpa@zytor.com>
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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>
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From: Joerg Roedel <jroedel@suse.de>

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 <jroedel@suse.de>
---
 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