From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8C0ECC5B572 for ; Sun, 16 Aug 2026 11:00:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=1IKL46JfxrcOqE7Q7MesTGEIIR01Ean6sDupkVMBBfo=; b=aICKnh5TKQ0n+yI3nyoyLvGa0Y skXZ0Qo5vHjUlwYEMoMQiRGwc9ReB4jRj9jSebsuZAGPS4mXXUgRLet8yRVBI5ljAkloB8VrPIuq+ 44hQj3VMFq70XuSJjTkp8+hL/QY1V1E2bAc9wfZhThoXpglVSyQJPkDK7T6Kw20+nVAhOT5UQ7TIq Lwieso297YTKxM3Sd/1lS/JMLoNduoNjfZX3ZLt7ElJvISmc4PZXe8qj4lcbo0CbzymkCq0Hm6ATl LRL5qkWFSBgHsd1Bq2NlT1VwI5XVjuFoAKHiGUnb85b128Iw6ayjgRVsmMet5/MP490BdWkpJSdAN qI+ussoA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wvYbT-00000004g8B-3NQL; Sun, 16 Aug 2026 11:00:35 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wvYbS-00000004g7I-3gzV; Sun, 16 Aug 2026 11:00:34 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 51F45600BC; Sun, 16 Aug 2026 11:00:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9E4551F00A3D; Sun, 16 Aug 2026 11:00:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786878034; bh=1IKL46JfxrcOqE7Q7MesTGEIIR01Ean6sDupkVMBBfo=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=P9+LCIokkZwCxlCXxUfmKZtBV+2ZFYeAUSRtldsh+4ZQEIUC27Nsf54Liq5GxaM39 YfPY+8QsJ7oU1AkJ98+FaB1liInriqrdmg6QGU8AR80VSGfFnkXvRwRAfZZDI/Jomu kIwM1dSZLvEQt5yrvnxc+jGnvV4ktJCRFXK5ZYNpGsarsXvQygnusynQSHHUvXQuvr u2HkLuP3TYOjS8eUNjbzEQoagVGwjjUt1C3gymqNh2BABKqw/jb0fWEDz2ZC6l8jCO V5y4YFqIBqtBOeZJhmgcCc4QKD+EqboPW166BiKASPMgifH3tNoZdWwW83tBvwr6c8 hnja77sN6qqDA== From: "Mike Rapoport (Microsoft)" Date: Sun, 16 Aug 2026 13:59:29 +0300 Subject: [PATCH 6/6] Revert "arch: introduce set_direct_map_valid_noflush()" MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260816-execmem-set-vm-perms-v0-2-v1-6-90944a3ad43f@kernel.org> References: <20260816-execmem-set-vm-perms-v0-2-v1-0-90944a3ad43f@kernel.org> In-Reply-To: <20260816-execmem-set-vm-perms-v0-2-v1-0-90944a3ad43f@kernel.org> To: Andrew Morton Cc: =?utf-8?q?Adrian_Barna=C5=9B?= , Albert Ou , Alexander Gordeev , Alexandre Ghiti , Andy Lutomirski , Borislav Petkov , Brendan Jackman , Catalin Marinas , Christian Borntraeger , Dave Hansen , David Hildenbrand , Gerald Schaefer , Heiko Carstens , Huacai Chen , Ingo Molnar , Len Brown , Mike Rapoport , Palmer Dabbelt , Paul Walmsley , Pavel Machek , Peter Zijlstra , "H. Peter Anvin" , "Rafael J. Wysocki" , Ryan Roberts , Sven Schnelle , Thomas Gleixner , Uladzislau Rezki , Vasily Gorbik , WANG Xuerui , Will Deacon , x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-pm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, loongarch@lists.linux.dev X-Mailer: b4 0.17-dev X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Commit 0c6378a71574 ("arch: introduce set_direct_map_valid_noflush()") added set_direct_map_valid_noflush() to allow updating the direct map for a physically contiguous range in execmem. As Brendan recently pointed out [1], this API is confusing because on arm64 it means that is sets VALID bit in ptes, while on other architectures it is an analog of set_direct_map_default_noflush(). The only user of set_direct_map_valid_noflush() was execmem's ROX cache freeing path and it was switched to utilize VM_FLUSH_RESET_PERMS for resetting permissions of the direct map alias. With the last user gone and with set_direct_map_{invalid,default}_noflush() accepting number of pages as a parameter, set_direct_map_valid_noflush() become a copy of set_memory_valid() on arm64 and a duplicate of set_direct_map_{invalid,default}_noflush() on other architecture, it is safe to remove set_direct_map_valid_noflush(). Also drop a stale comment in arm64::__kernel_map_pages() that Linus bothered to add when merging changes containing set_direct_map_valid_noflush() to his tree. This reverts commit 0c6378a71574daa6cd1534ad42a956e3262756c7. [1] https://lore.kernel.org/all/DJ69RCVRBO0Y.3JCYSW50IC4RC@linux.dev Signed-off-by: Mike Rapoport (Microsoft) --- arch/arm64/include/asm/set_memory.h | 1 - arch/arm64/mm/pageattr.c | 16 ---------------- arch/loongarch/include/asm/set_memory.h | 1 - arch/loongarch/mm/pageattr.c | 19 ------------------- arch/riscv/include/asm/set_memory.h | 1 - arch/riscv/mm/pageattr.c | 15 --------------- arch/s390/include/asm/set_memory.h | 1 - arch/s390/mm/pageattr.c | 12 ------------ arch/x86/include/asm/set_memory.h | 1 - arch/x86/mm/pat/set_memory.c | 8 -------- include/linux/set_memory.h | 6 ------ 11 files changed, 81 deletions(-) diff --git a/arch/arm64/include/asm/set_memory.h b/arch/arm64/include/asm/set_memory.h index b07fd4e026ea..0091ba12200e 100644 --- a/arch/arm64/include/asm/set_memory.h +++ b/arch/arm64/include/asm/set_memory.h @@ -13,7 +13,6 @@ int set_memory_valid(unsigned long addr, int numpages, int enable); int set_direct_map_invalid_noflush(struct page *page, unsigned int numpages); int set_direct_map_default_noflush(struct page *page, unsigned int numpages); -int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid); bool kernel_page_present(struct page *page); int set_memory_encrypted(unsigned long addr, int numpages); diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c index db8d60a84d14..132938b32eb1 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -355,23 +355,7 @@ int realm_register_memory_enc_ops(void) return arm64_mem_crypt_ops_register(&realm_crypt_ops); } -int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid) -{ - unsigned long addr = (unsigned long)page_address(page); - - if (!can_set_direct_map()) - return 0; - - return set_memory_valid(addr, nr, valid); -} - #ifdef CONFIG_DEBUG_PAGEALLOC -/* - * This is - apart from the return value - doing the same - * thing as the new set_direct_map_valid_noflush() function. - * - * Unify? Explain the conceptual differences? - */ void __kernel_map_pages(struct page *page, int numpages, int enable) { if (!can_set_direct_map()) diff --git a/arch/loongarch/include/asm/set_memory.h b/arch/loongarch/include/asm/set_memory.h index 563aab92896e..4bb01172fbc2 100644 --- a/arch/loongarch/include/asm/set_memory.h +++ b/arch/loongarch/include/asm/set_memory.h @@ -17,6 +17,5 @@ int set_memory_rw(unsigned long addr, int numpages); bool kernel_page_present(struct page *page); int set_direct_map_default_noflush(struct page *page, unsigned int nr); int set_direct_map_invalid_noflush(struct page *page, unsigned int nr); -int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid); #endif /* _ASM_LOONGARCH_SET_MEMORY_H */ diff --git a/arch/loongarch/mm/pageattr.c b/arch/loongarch/mm/pageattr.c index 43ad2a104f19..a7dcff40f759 100644 --- a/arch/loongarch/mm/pageattr.c +++ b/arch/loongarch/mm/pageattr.c @@ -217,22 +217,3 @@ int set_direct_map_invalid_noflush(struct page *page, unsigned int nr) return __set_memory(addr, nr, __pgprot(0), __pgprot(_PAGE_PRESENT | _PAGE_VALID)); } - -int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid) -{ - unsigned long addr = (unsigned long)page_address(page); - pgprot_t set, clear; - - if (addr < vm_map_base) - return 0; - - if (valid) { - set = PAGE_KERNEL; - clear = __pgprot(0); - } else { - set = __pgprot(0); - clear = __pgprot(_PAGE_PRESENT | _PAGE_VALID); - } - - return __set_memory(addr, nr, set, clear); -} diff --git a/arch/riscv/include/asm/set_memory.h b/arch/riscv/include/asm/set_memory.h index db1d0ed82b69..e9f9960c1947 100644 --- a/arch/riscv/include/asm/set_memory.h +++ b/arch/riscv/include/asm/set_memory.h @@ -42,7 +42,6 @@ static inline int set_kernel_memory(char *startp, char *endp, int set_direct_map_invalid_noflush(struct page *page, unsigned int nr); int set_direct_map_default_noflush(struct page *page, unsigned int nr); -int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid); bool kernel_page_present(struct page *page); #endif /* __ASSEMBLER__ */ diff --git a/arch/riscv/mm/pageattr.c b/arch/riscv/mm/pageattr.c index 20ef95b1d0c3..5b3cf326455d 100644 --- a/arch/riscv/mm/pageattr.c +++ b/arch/riscv/mm/pageattr.c @@ -386,21 +386,6 @@ int set_direct_map_default_noflush(struct page *page, unsigned int nr) PAGE_KERNEL, __pgprot(_PAGE_EXEC)); } -int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid) -{ - pgprot_t set, clear; - - if (valid) { - set = PAGE_KERNEL; - clear = __pgprot(_PAGE_EXEC); - } else { - set = __pgprot(0); - clear = __pgprot(_PAGE_PRESENT); - } - - return __set_memory((unsigned long)page_address(page), nr, set, clear); -} - #ifdef CONFIG_DEBUG_PAGEALLOC static int debug_pagealloc_set_page(pte_t *pte, unsigned long addr, void *data) { diff --git a/arch/s390/include/asm/set_memory.h b/arch/s390/include/asm/set_memory.h index 6b0aa9147ed8..e3562bf0c1aa 100644 --- a/arch/s390/include/asm/set_memory.h +++ b/arch/s390/include/asm/set_memory.h @@ -62,7 +62,6 @@ __SET_MEMORY_FUNC(set_memory_4k, SET_MEMORY_4K) int set_direct_map_invalid_noflush(struct page *page, unsigned int nr); int set_direct_map_default_noflush(struct page *page, unsigned int nr); -int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid); bool kernel_page_present(struct page *page); #endif diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c index 02d992b251cb..f46a666bc5c7 100644 --- a/arch/s390/mm/pageattr.c +++ b/arch/s390/mm/pageattr.c @@ -397,18 +397,6 @@ int set_direct_map_default_noflush(struct page *page, unsigned int nr) return __set_memory((unsigned long)page_to_virt(page), nr, SET_MEMORY_DEF); } -int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid) -{ - unsigned long flags; - - if (valid) - flags = SET_MEMORY_DEF; - else - flags = SET_MEMORY_INV; - - return __set_memory((unsigned long)page_to_virt(page), nr, flags); -} - bool kernel_page_present(struct page *page) { unsigned long addr; diff --git a/arch/x86/include/asm/set_memory.h b/arch/x86/include/asm/set_memory.h index 0c4235d159f4..39271a5ea925 100644 --- a/arch/x86/include/asm/set_memory.h +++ b/arch/x86/include/asm/set_memory.h @@ -88,7 +88,6 @@ int set_pages_rw(struct page *page, int numpages); int set_direct_map_invalid_noflush(struct page *page, unsigned int nr); int set_direct_map_default_noflush(struct page *page, unsigned int nr); -int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid); bool kernel_page_present(struct page *page); extern int kernel_set_to_readonly; diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index 9022354e26e9..a6b2912a4837 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -2683,14 +2683,6 @@ int set_direct_map_default_noflush(struct page *page, unsigned int nr) return __set_pages_p(page, nr); } -int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid) -{ - if (valid) - return __set_pages_p(page, nr); - - return __set_pages_np(page, nr); -} - #ifdef CONFIG_DEBUG_PAGEALLOC void __kernel_map_pages(struct page *page, int numpages, int enable) { diff --git a/include/linux/set_memory.h b/include/linux/set_memory.h index 0b77f1d7d8b9..3fe293cfed8c 100644 --- a/include/linux/set_memory.h +++ b/include/linux/set_memory.h @@ -36,12 +36,6 @@ static inline int set_direct_map_default_noflush(struct page *page, return 0; } -static inline int set_direct_map_valid_noflush(struct page *page, - unsigned nr, bool valid) -{ - return 0; -} - static inline bool kernel_page_present(struct page *page) { return true; -- 2.53.0