[PATCHv8,01/11] x86/mm: Fix CR3_ADDR_MASK

Message ID	20220830010104.1282-2-kirill.shutemov@linux.intel.com (mailing list archive)
State	New
Headers	show Return-Path: <owner-linux-mm@kvack.org> From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> To: Dave Hansen <dave.hansen@linux.intel.com>, Andy Lutomirski <luto@kernel.org>, Peter Zijlstra <peterz@infradead.org> Cc: x86@kernel.org, Kostya Serebryany <kcc@google.com>, Andrey Ryabinin <ryabinin.a.a@gmail.com>, Andrey Konovalov <andreyknvl@gmail.com>, Alexander Potapenko <glider@google.com>, Taras Madan <tarasmadan@google.com>, Dmitry Vyukov <dvyukov@google.com>, "H . J . Lu" <hjl.tools@gmail.com>, Andi Kleen <ak@linux.intel.com>, Rick Edgecombe <rick.p.edgecombe@intel.com>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Subject: [PATCHv8 01/11] x86/mm: Fix CR3_ADDR_MASK Date: Tue, 30 Aug 2022 04:00:54 +0300 Message-Id: <20220830010104.1282-2-kirill.shutemov@linux.intel.com> In-Reply-To: <20220830010104.1282-1-kirill.shutemov@linux.intel.com> References: <20220830010104.1282-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org Precedence: bulk
Series	Linear Address Masking enabling \| expand [PATCHv8,00/11] Linear Address Masking enabling [PATCHv8,01/11] x86/mm: Fix CR3_ADDR_MASK [PATCHv8,02/11] x86: CPUID and CR3/CR4 flags for Linear Address Masking [PATCHv8,03/11] mm: Pass down mm_struct to untagged_addr() [PATCHv8,04/11] x86/mm: Handle LAM on context switch [PATCHv8,05/11] x86/uaccess: Provide untagged_addr() and remove tags before address check [PATCHv8,06/11] x86/mm: Provide arch_prctl() interface for LAM [PATCHv8,07/11] x86: Expose untagging mask in /proc/$PID/arch_status [PATCHv8,08/11] selftests/x86/lam: Add malloc and tag-bits test cases for linear-address masking [PATCHv8,09/11] selftests/x86/lam: Add mmap and SYSCALL test cases for linear-address masking [PATCHv8,10/11] selftests/x86/lam: Add io_uring test cases for linear-address masking [PATCHv8,11/11] selftests/x86/lam: Add inherit test cases for linear-address masking

Message ID

20220830010104.1282-2-kirill.shutemov@linux.intel.com (mailing list archive)

State

New

Headers

From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Dave Hansen <dave.hansen@linux.intel.com>,
	Andy Lutomirski <luto@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>
Cc: x86@kernel.org,
	Kostya Serebryany <kcc@google.com>,
	Andrey Ryabinin <ryabinin.a.a@gmail.com>,
	Andrey Konovalov <andreyknvl@gmail.com>,
	Alexander Potapenko <glider@google.com>,
	Taras Madan <tarasmadan@google.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	"H . J . Lu" <hjl.tools@gmail.com>,
	Andi Kleen <ak@linux.intel.com>,
	Rick Edgecombe <rick.p.edgecombe@intel.com>,
	linux-mm@kvack.org,
	linux-kernel@vger.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCHv8 01/11] x86/mm: Fix CR3_ADDR_MASK
Date: Tue, 30 Aug 2022 04:00:54 +0300
Message-Id: <20220830010104.1282-2-kirill.shutemov@linux.intel.com>
In-Reply-To: <20220830010104.1282-1-kirill.shutemov@linux.intel.com>
References: <20220830010104.1282-1-kirill.shutemov@linux.intel.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: owner-linux-mm@kvack.org
Precedence: bulk

Series

Linear Address Masking enabling | expand

Commit Message

Kirill A. Shutemov Aug. 30, 2022, 1 a.m. UTC

The mask must not include bits above physical address mask. These bits
are reserved and can be used for other things. Bits 61 and 62 are used
for Linear Address Masking.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Tested-by: Alexander Potapenko <glider@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 arch/x86/include/asm/processor-flags.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/processor-flags.h b/arch/x86/include/asm/processor-flags.h
index 02c2cbda4a74..a7f3d9100adb 100644
--- a/arch/x86/include/asm/processor-flags.h
+++ b/arch/x86/include/asm/processor-flags.h
@@ -35,7 +35,7 @@ 
  */
 #ifdef CONFIG_X86_64
 /* Mask off the address space ID and SME encryption bits. */
-#define CR3_ADDR_MASK	__sme_clr(0x7FFFFFFFFFFFF000ull)
+#define CR3_ADDR_MASK	__sme_clr(PHYSICAL_PAGE_MASK)
 #define CR3_PCID_MASK	0xFFFull
 #define CR3_NOFLUSH	BIT_ULL(63)

[PATCHv8,01/11] x86/mm: Fix CR3_ADDR_MASK

Commit Message

Patch