linux-kernel - [tip:x86/mm] x86/mm: Add SME support for read_cr3

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Date:   Tue, 18 Jul 2017 03:51:12 -0700
From:   tip-bot for Tom Lendacky <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     brijesh.singh@....com, luto@...nel.org, hpa@...or.com,
        toshi.kani@....com, matt@...eblueprint.co.uk, dyoung@...hat.com,
        mst@...hat.com, pbonzini@...hat.com, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, mingo@...nel.org, rkrcmar@...hat.com,
        bp@...e.de, riel@...hat.com, lwoodman@...hat.com,
        glider@...gle.com, arnd@...db.de, dvyukov@...gle.com,
        aryabinin@...tuozzo.com, torvalds@...ux-foundation.org,
        thomas.lendacky@....com, corbet@....net, peterz@...radead.org,
        bp@...en8.de, konrad.wilk@...cle.com
Subject: [tip:x86/mm] x86/mm: Add SME support for read_cr3_pa()

Commit-ID:  eef9c4abe77f55b1600f59d8ac5f1d953e2f5384
Gitweb:     http://git.kernel.org/tip/eef9c4abe77f55b1600f59d8ac5f1d953e2f5384
Author:     Tom Lendacky <thomas.lendacky@....com>
AuthorDate: Mon, 17 Jul 2017 16:10:08 -0500
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 18 Jul 2017 11:38:00 +0200

x86/mm: Add SME support for read_cr3_pa()

The CR3 register entry can contain the SME encryption mask that indicates
the PGD is encrypted.  The encryption mask should not be used when
creating a virtual address from the CR3 register, so remove the SME
encryption mask in the read_cr3_pa() function.

During early boot SME will need to use a native version of read_cr3_pa(),
so create native_read_cr3_pa().

Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Borislav Petkov <bp@...e.de>
Cc: Alexander Potapenko <glider@...gle.com>
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brijesh Singh <brijesh.singh@....com>
Cc: Dave Young <dyoung@...hat.com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Jonathan Corbet <corbet@....net>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Larry Woodman <lwoodman@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Matt Fleming <matt@...eblueprint.co.uk>
Cc: Michael S. Tsirkin <mst@...hat.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Toshimitsu Kani <toshi.kani@....com>
Cc: kasan-dev@...glegroups.com
Cc: kvm@...r.kernel.org
Cc: linux-arch@...r.kernel.org
Cc: linux-doc@...r.kernel.org
Cc: linux-efi@...r.kernel.org
Cc: linux-mm@...ck.org
Link: http://lkml.kernel.org/r/767b085c384a46f67f451f8589903a462c7ff68a.1500319216.git.thomas.lendacky@amd.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/processor-flags.h | 5 +++--
 arch/x86/include/asm/processor.h       | 5 +++++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/processor-flags.h b/arch/x86/include/asm/processor-flags.h
index 79aa2f9..f5d3e50 100644
--- a/arch/x86/include/asm/processor-flags.h
+++ b/arch/x86/include/asm/processor-flags.h
@@ -2,6 +2,7 @@
 #define _ASM_X86_PROCESSOR_FLAGS_H
 
 #include <uapi/asm/processor-flags.h>
+#include <linux/mem_encrypt.h>
 
 #ifdef CONFIG_VM86
 #define X86_VM_MASK	X86_EFLAGS_VM
@@ -32,8 +33,8 @@
  * CR3_ADDR_MASK is the mask used by read_cr3_pa().
  */
 #ifdef CONFIG_X86_64
-/* Mask off the address space ID bits. */
-#define CR3_ADDR_MASK 0x7FFFFFFFFFFFF000ull
+/* Mask off the address space ID and SME encryption bits. */
+#define CR3_ADDR_MASK __sme_clr(0x7FFFFFFFFFFFF000ull)
 #define CR3_PCID_MASK 0xFFFull
 #else
 /*
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index a68f70c..973709d 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -240,6 +240,11 @@ static inline unsigned long read_cr3_pa(void)
 	return __read_cr3() & CR3_ADDR_MASK;
 }
 
+static inline unsigned long native_read_cr3_pa(void)
+{
+	return __native_read_cr3() & CR3_ADDR_MASK;
+}
+
 static inline void load_cr3(pgd_t *pgdir)
 {
 	write_cr3(__sme_pa(pgdir));