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Shutemov" X-Google-Original-From: "Kirill A. Shutemov" Received: by box.localdomain (Postfix, from userid 1000) id 33AC2101321; Wed, 31 Jul 2019 18:08:16 +0300 (+03) To: Andrew Morton , x86@kernel.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Borislav Petkov , Peter Zijlstra , Andy Lutomirski , David Howells Cc: Kees Cook , Dave Hansen , Kai Huang , Jacob Pan , Alison Schofield , linux-mm@kvack.org, kvm@vger.kernel.org, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [PATCHv2 10/59] x86/mm: Preserve KeyID on pte_modify() and pgprot_modify() Date: Wed, 31 Jul 2019 18:07:24 +0300 Message-Id: <20190731150813.26289-11-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190731150813.26289-1-kirill.shutemov@linux.intel.com> References: <20190731150813.26289-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: An encrypted VMA will have KeyID stored in vma->vm_page_prot. This way we don't need to do anything special to setup encrypted page table entries and don't need to reserve space for KeyID in a VMA. This patch changes _PAGE_CHG_MASK to include KeyID bits. Otherwise they are going to be stripped from vm_page_prot on the first pgprot_modify(). Define PTE_PFN_MASK_MAX similar to PTE_PFN_MASK but based on __PHYSICAL_MASK_SHIFT. This way we include whole range of bits architecturally available for PFN without referencing physical_mask and mktme_keyid_mask variables. Signed-off-by: Kirill A. Shutemov --- arch/x86/include/asm/pgtable_types.h | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index b5e49e6bac63..c23793146759 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -116,12 +116,25 @@ _PAGE_ACCESSED | _PAGE_DIRTY) /* - * Set of bits not changed in pte_modify. The pte's - * protection key is treated like _PAGE_RW, for - * instance, and is *not* included in this mask since - * pte_modify() does modify it. + * Set of bits not changed in pte_modify. + * + * The pte's protection key is treated like _PAGE_RW, for instance, and is + * *not* included in this mask since pte_modify() does modify it. + * + * They include the physical address and the memory encryption keyID. + * The paddr and the keyID never occupy the same bits at the same time. + * But, a given bit might be used for the keyID on one system and used for + * the physical address on another. As an optimization, we manage them in + * one unit here since their combination always occupies the same hardware + * bits. PTE_PFN_MASK_MAX stores combined mask. + * + * Cast PAGE_MASK to a signed type so that it is sign-extended if + * virtual addresses are 32-bits but physical addresses are larger + * (ie, 32-bit PAE). */ -#define _PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \ +#define PTE_PFN_MASK_MAX \ + (((signed long)PAGE_MASK) & ((1ULL << __PHYSICAL_MASK_SHIFT) - 1)) +#define _PAGE_CHG_MASK (PTE_PFN_MASK_MAX | _PAGE_PCD | _PAGE_PWT | \ _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY | \ _PAGE_SOFT_DIRTY | _PAGE_DEVMAP) #define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE) -- 2.21.0