From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yk0-f169.google.com (mail-yk0-f169.google.com [209.85.160.169]) by kanga.kvack.org (Postfix) with ESMTP id 5AFF76B0038 for ; Thu, 9 Jul 2015 13:04:53 -0400 (EDT) Received: by ykee186 with SMTP id e186so41566462yke.2 for ; Thu, 09 Jul 2015 10:04:53 -0700 (PDT) Received: from g9t5009.houston.hp.com (g9t5009.houston.hp.com. [15.240.92.67]) by mx.google.com with ESMTPS id s190si4139818ywd.126.2015.07.09.10.04.50 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 09 Jul 2015 10:04:51 -0700 (PDT) From: Toshi Kani Subject: [PATCH 1/2] x86: Fix pXd_flags() to handle _PAGE_PAT_LARGE Date: Thu, 9 Jul 2015 11:03:50 -0600 Message-Id: <1436461431-27305-2-git-send-email-toshi.kani@hp.com> In-Reply-To: <1436461431-27305-1-git-send-email-toshi.kani@hp.com> References: <1436461431-27305-1-git-send-email-toshi.kani@hp.com> Sender: owner-linux-mm@kvack.org List-ID: To: hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com Cc: akpm@linux-foundation.org, bp@alien8.de, linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org, jgross@suse.com, konrad.wilk@oracle.com, elliott@hp.com, Toshi Kani The PAT bit gets relocated to bit 12 when PUD and PMD mappings are used. This bit 12, however, is not covered by PTE_FLAGS_MASK, which is corrently used for masking the flag bits for all cases. Fix pud_flags() and pmd_flags() to cover the PAT bit, _PAGE_PAT_LARGE, when they are used to map a large page with _PAGE_PSE set. Signed-off-by: Toshi Kani Cc: Juergen Gross Cc: Konrad Wilk Cc: Robert Elliott Cc: Thomas Gleixner Cc: H. Peter Anvin Cc: Ingo Molnar Cc: Borislav Petkov Cc: Andrew Morton --- arch/x86/include/asm/pgtable_types.h | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index 13f310b..caaf45c 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -212,9 +212,13 @@ enum page_cache_mode { /* PTE_PFN_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */ #define PTE_PFN_MASK ((pteval_t)PHYSICAL_PAGE_MASK) -/* PTE_FLAGS_MASK extracts the flags from a (pte|pmd|pud|pgd)val_t */ +/* Extracts the flags from a (pte|pmd|pud|pgd)val_t of a 4KB page */ #define PTE_FLAGS_MASK (~PTE_PFN_MASK) +/* Extracts the flags from a (pmd|pud)val_t of a (1GB|2MB) page */ +#define PMD_FLAGS_MASK_LARGE ((~PTE_PFN_MASK) | _PAGE_PAT_LARGE) +#define PUD_FLAGS_MASK_LARGE ((~PTE_PFN_MASK) | _PAGE_PAT_LARGE) + typedef struct pgprot { pgprotval_t pgprot; } pgprot_t; typedef struct { pgdval_t pgd; } pgd_t; @@ -278,12 +282,18 @@ static inline pmdval_t native_pmd_val(pmd_t pmd) static inline pudval_t pud_flags(pud_t pud) { - return native_pud_val(pud) & PTE_FLAGS_MASK; + if (native_pud_val(pud) & _PAGE_PSE) + return native_pud_val(pud) & PUD_FLAGS_MASK_LARGE; + else + return native_pud_val(pud) & PTE_FLAGS_MASK; } static inline pmdval_t pmd_flags(pmd_t pmd) { - return native_pmd_val(pmd) & PTE_FLAGS_MASK; + if (native_pmd_val(pmd) & _PAGE_PSE) + return native_pmd_val(pmd) & PMD_FLAGS_MASK_LARGE; + else + return native_pmd_val(pmd) & PTE_FLAGS_MASK; } static inline pte_t native_make_pte(pteval_t val) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org