From nobody Wed Nov 27 14:41:17 2024 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 9072E18F2FF for ; Thu, 10 Oct 2024 03:50:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728532257; cv=none; b=nCbLgTPjPhYkkXbA9GYnZTIQTVNkvFHC7xCB8+Pg6zmT2lLvvqmf/v1T3EUYqD+p8dsKD8d/uIpqznXZg1XBtHkTWC74j9/2CgM/nvwquWecYVbZCMqNZo2ftHJI58S3wtCDltMjfA2D/q59QTZI+BZy4/R3SMP7waaottamqLs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728532257; c=relaxed/simple; bh=cmwqGpfWQFkdzlK0RLiSRImOA16DQPPls1SXPMINYLc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=SW4ikMk90Gkyq6UrBPEEw6QxzuFwMzVTIdQco6ugYTYKgox+47I4t71rw0kfC7g5eba6cGgNNq0lef/9EPxutbwmPFvKacak6ELcBNMQkcz0cW4hJrUUbHUZbNkSLOswiyd2m5m9tjw0IZHC7UUnfB3v8+nvtmREDAmJ23XNEcM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [10.2.5.213]) by gateway (Coremail) with SMTP id _____8AxjnMbTwdn1bsRAA--.25500S3; Thu, 10 Oct 2024 11:50:51 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowMDx7tUZTwdnFP8hAA--.52915S3; Thu, 10 Oct 2024 11:50:49 +0800 (CST) From: Bibo Mao To: Huacai Chen , Andrey Ryabinin , Andrew Morton Cc: David Hildenbrand , Barry Song , loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org Subject: [PATCH 1/4] LoongArch: Set pte entry with PAGE_GLOBAL for kernel space Date: Thu, 10 Oct 2024 11:50:45 +0800 Message-Id: <20241010035048.3422527-2-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20241010035048.3422527-1-maobibo@loongson.cn> References: <20241010035048.3422527-1-maobibo@loongson.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qMiowMDx7tUZTwdnFP8hAA--.52915S3 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Content-Type: text/plain; charset="utf-8" Unlike general architectures, there are two pages for one TLB entry on LoongArch system. For kernel space, it requires both two pte entries with PAGE_GLOBAL set, else HW treats it as non-global tlb, there will be potential problems if tlb entry for kernel space is not global. Such as fail to flush kernel tlb with function local_flush_tlb_kernel_range() which only flush tlb with global bit. Here function kernel_pte_init() is added, it can be used to init pte table when it is created, so the default inital pte is PAGE_GLOBAL rather than zero at beginning. Kernel space areas includes fixmap, percpu, vmalloc and kasan areas set default pte entry with PAGE_GLOBAL set. Signed-off-by: Bibo Mao --- arch/loongarch/include/asm/pgalloc.h | 13 +++++++++++++ arch/loongarch/include/asm/pgtable.h | 1 + arch/loongarch/mm/init.c | 4 +++- arch/loongarch/mm/kasan_init.c | 4 +++- arch/loongarch/mm/pgtable.c | 22 ++++++++++++++++++++++ 5 files changed, 42 insertions(+), 2 deletions(-) diff --git a/arch/loongarch/include/asm/pgalloc.h b/arch/loongarch/include/= asm/pgalloc.h index 4e2d6b7ca2ee..b2698c03dc2c 100644 --- a/arch/loongarch/include/asm/pgalloc.h +++ b/arch/loongarch/include/asm/pgalloc.h @@ -10,8 +10,21 @@ =20 #define __HAVE_ARCH_PMD_ALLOC_ONE #define __HAVE_ARCH_PUD_ALLOC_ONE +#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL #include =20 +static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) +{ + pte_t *pte; + + pte =3D (pte_t *) __get_free_page(GFP_KERNEL); + if (!pte) + return NULL; + + kernel_pte_init(pte); + return pte; +} + static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte) { diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/= asm/pgtable.h index 9965f52ef65b..22e3a8f96213 100644 --- a/arch/loongarch/include/asm/pgtable.h +++ b/arch/loongarch/include/asm/pgtable.h @@ -269,6 +269,7 @@ extern void set_pmd_at(struct mm_struct *mm, unsigned l= ong addr, pmd_t *pmdp, pm extern void pgd_init(void *addr); extern void pud_init(void *addr); extern void pmd_init(void *addr); +extern void kernel_pte_init(void *addr); =20 /* * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that diff --git a/arch/loongarch/mm/init.c b/arch/loongarch/mm/init.c index 8a87a482c8f4..9f26e933a8a3 100644 --- a/arch/loongarch/mm/init.c +++ b/arch/loongarch/mm/init.c @@ -198,9 +198,11 @@ pte_t * __init populate_kernel_pte(unsigned long addr) if (!pmd_present(pmdp_get(pmd))) { pte_t *pte; =20 - pte =3D memblock_alloc(PAGE_SIZE, PAGE_SIZE); + pte =3D memblock_alloc_raw(PAGE_SIZE, PAGE_SIZE); if (!pte) panic("%s: Failed to allocate memory\n", __func__); + + kernel_pte_init(pte); pmd_populate_kernel(&init_mm, pmd, pte); } =20 diff --git a/arch/loongarch/mm/kasan_init.c b/arch/loongarch/mm/kasan_init.c index 427d6b1aec09..34988573b0d5 100644 --- a/arch/loongarch/mm/kasan_init.c +++ b/arch/loongarch/mm/kasan_init.c @@ -152,6 +152,8 @@ static void __init kasan_pte_populate(pmd_t *pmdp, unsi= gned long addr, phys_addr_t page_phys =3D early ? __pa_symbol(kasan_early_shadow_page) : kasan_alloc_zeroed_page(node); + if (!early) + kernel_pte_init(__va(page_phys)); next =3D addr + PAGE_SIZE; set_pte(ptep, pfn_pte(__phys_to_pfn(page_phys), PAGE_KERNEL)); } while (ptep++, addr =3D next, addr !=3D end && __pte_none(early, ptep_g= et(ptep))); @@ -287,7 +289,7 @@ void __init kasan_init(void) set_pte(&kasan_early_shadow_pte[i], pfn_pte(__phys_to_pfn(__pa_symbol(kasan_early_shadow_page)), PAGE_KERNE= L_RO)); =20 - memset(kasan_early_shadow_page, 0, PAGE_SIZE); + kernel_pte_init(kasan_early_shadow_page); csr_write64(__pa_symbol(swapper_pg_dir), LOONGARCH_CSR_PGDH); local_flush_tlb_all(); =20 diff --git a/arch/loongarch/mm/pgtable.c b/arch/loongarch/mm/pgtable.c index eb6a29b491a7..228ffc1db0a3 100644 --- a/arch/loongarch/mm/pgtable.c +++ b/arch/loongarch/mm/pgtable.c @@ -38,6 +38,28 @@ pgd_t *pgd_alloc(struct mm_struct *mm) } EXPORT_SYMBOL_GPL(pgd_alloc); =20 +void kernel_pte_init(void *addr) +{ + unsigned long *p, *end; + unsigned long entry; + + entry =3D (unsigned long)_PAGE_GLOBAL; + p =3D (unsigned long *)addr; + end =3D p + PTRS_PER_PTE; + + do { + p[0] =3D entry; + p[1] =3D entry; + p[2] =3D entry; + p[3] =3D entry; + p[4] =3D entry; + p +=3D 8; + p[-3] =3D entry; + p[-2] =3D entry; + p[-1] =3D entry; + } while (p !=3D end); +} + void pgd_init(void *addr) { unsigned long *p, *end; --=20 2.39.3