From patchwork Thu Aug 22 12:39:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kirill A . Shutemov" X-Patchwork-Id: 13773309 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2F36A1C9DCC; Thu, 22 Aug 2024 12:40:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.20 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724330411; cv=none; b=UH7K2LkdqZi9Zk6kWr9BHjJC28ZkrauyfCEJkgvFVqHiUMdi3j/4Dz61Rxec+xJ1HSYCTfZhUsxKlZgxR+k8+CsVdJxU1Ip8ROLSZlw6K1mfIxn93hZ5lEHCt/hqPAhYV4dwFaOFGdlnBRoujoqzpjmQp0YsaD1Xmn9hOZRgsaw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724330411; c=relaxed/simple; bh=vy3STgE3PjnKqGO0pLDMgzAb6NmQRTblv+6S2nmqiFo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=j2feco1MYCVlrOmG9kQAjhdI/dIZRnimysAL15EEMjHx7MD+wMxjn+GGLU5UYDBfEh71iX2l3N1knAuJdc1uFw4kIWdNKiaqZugX8Mpw3ka3sHvsnmLnpS9DIgzDEkavhMQX7EOANpmYxsPwivODyPMK8bNAwhdKIcCGrSdHdVQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.helo=mgamail.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=AURBxX6P; arc=none smtp.client-ip=198.175.65.20 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.helo=mgamail.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="AURBxX6P" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1724330410; x=1755866410; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=vy3STgE3PjnKqGO0pLDMgzAb6NmQRTblv+6S2nmqiFo=; b=AURBxX6PjtGQpJ0Ld3B48a81VnBHlCAwF5dBgXq5LY80ERlI1uv5kSP+ zUNbl1UMvHSB6/M16e6ml5R3XtC12mXS1iuiMmsKVOrHcHTNIEWDzLU2W 6PfW9/FpwciLCV4tEs0YeRuDY7mUUUdV96C25DAt6e/OVc32nBZ/eIEcl qGKdkWl7CFZiaX7I1k4gt82koKy4YBv+veFnh8EgxDz6BZx48ty+WTwkM 3EQWbyAoSSzlsdkNa4lQYXM2kk2AlFN88hZIdmBpByWAhGbwKIDQIc6AX ARcJYRUP2yqGbl0FMShHJYfh6AB4YUUIdhGwN7s1Qu/W1mL0/2CtVmh6F g==; X-CSE-ConnectionGUID: tdSgkcPPReKMiqP5+aXhXg== X-CSE-MsgGUID: BU1PtdsvSjitFnEz1hRuPQ== X-IronPort-AV: E=McAfee;i="6700,10204,11172"; a="22554218" X-IronPort-AV: E=Sophos;i="6.10,167,1719903600"; d="scan'208";a="22554218" Received: from orviesa005.jf.intel.com ([10.64.159.145]) by orvoesa112.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Aug 2024 05:40:07 -0700 X-CSE-ConnectionGUID: DGNdl5xGTEmpkwyYoIpGgA== X-CSE-MsgGUID: gmvAVoE3Qp6CdEb7/7tIEg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,167,1719903600"; d="scan'208";a="66320995" Received: from black.fi.intel.com ([10.237.72.28]) by orviesa005.jf.intel.com with ESMTP; 22 Aug 2024 05:40:04 -0700 Received: by black.fi.intel.com (Postfix, from userid 1000) id 29DF2331; Thu, 22 Aug 2024 15:40:02 +0300 (EEST) From: "Kirill A. Shutemov" To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , "Rafael J. Wysocki" , Andy Lutomirski , Peter Zijlstra , Baoquan He Cc: Ard Biesheuvel , Tom Lendacky , Andrew Morton , Thomas Zimmermann , Sean Christopherson , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, "Kirill A. Shutemov" , Kai Huang Subject: [PATCHv4 2/4] x86/acpi: Replace manual page table initialization with kernel_ident_mapping_init() Date: Thu, 22 Aug 2024 15:39:58 +0300 Message-ID: <20240822124000.1171321-3-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240822124000.1171321-1-kirill.shutemov@linux.intel.com> References: <20240822124000.1171321-1-kirill.shutemov@linux.intel.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The function init_transition_pgtable() maps the page with asm_acpi_mp_play_dead() into an identity mapping. Replace manual page table initialization with kernel_ident_mapping_init() to avoid code duplication. Use x86_mapping_info::offset to get the page mapped at the correct location. Signed-off-by: Kirill A. Shutemov Reviewed-by: Kai Huang Reviewed-by: Tom Lendacky Acked-by: Rafael J. Wysocki --- arch/x86/kernel/acpi/madt_wakeup.c | 73 ++++++------------------------ 1 file changed, 15 insertions(+), 58 deletions(-) diff --git a/arch/x86/kernel/acpi/madt_wakeup.c b/arch/x86/kernel/acpi/madt_wakeup.c index d5ef6215583b..f36f28405dcc 100644 --- a/arch/x86/kernel/acpi/madt_wakeup.c +++ b/arch/x86/kernel/acpi/madt_wakeup.c @@ -70,58 +70,6 @@ static void __init free_pgt_page(void *pgt, void *dummy) return memblock_free(pgt, PAGE_SIZE); } -/* - * Make sure asm_acpi_mp_play_dead() is present in the identity mapping at - * the same place as in the kernel page tables. asm_acpi_mp_play_dead() switches - * to the identity mapping and the function has be present at the same spot in - * the virtual address space before and after switching page tables. - */ -static int __init init_transition_pgtable(pgd_t *pgd) -{ - pgprot_t prot = PAGE_KERNEL_EXEC_NOENC; - unsigned long vaddr, paddr; - p4d_t *p4d; - pud_t *pud; - pmd_t *pmd; - pte_t *pte; - - vaddr = (unsigned long)asm_acpi_mp_play_dead; - pgd += pgd_index(vaddr); - if (!pgd_present(*pgd)) { - p4d = (p4d_t *)alloc_pgt_page(NULL); - if (!p4d) - return -ENOMEM; - set_pgd(pgd, __pgd(__pa(p4d) | _KERNPG_TABLE)); - } - p4d = p4d_offset(pgd, vaddr); - if (!p4d_present(*p4d)) { - pud = (pud_t *)alloc_pgt_page(NULL); - if (!pud) - return -ENOMEM; - set_p4d(p4d, __p4d(__pa(pud) | _KERNPG_TABLE)); - } - pud = pud_offset(p4d, vaddr); - if (!pud_present(*pud)) { - pmd = (pmd_t *)alloc_pgt_page(NULL); - if (!pmd) - return -ENOMEM; - set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE)); - } - pmd = pmd_offset(pud, vaddr); - if (!pmd_present(*pmd)) { - pte = (pte_t *)alloc_pgt_page(NULL); - if (!pte) - return -ENOMEM; - set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE)); - } - pte = pte_offset_kernel(pmd, vaddr); - - paddr = __pa(vaddr); - set_pte(pte, pfn_pte(paddr >> PAGE_SHIFT, prot)); - - return 0; -} - static int __init acpi_mp_setup_reset(u64 reset_vector) { struct x86_mapping_info info = { @@ -130,6 +78,7 @@ static int __init acpi_mp_setup_reset(u64 reset_vector) .page_flag = __PAGE_KERNEL_LARGE_EXEC, .kernpg_flag = _KERNPG_TABLE_NOENC, }; + unsigned long mstart, mend; pgd_t *pgd; pgd = alloc_pgt_page(NULL); @@ -137,8 +86,6 @@ static int __init acpi_mp_setup_reset(u64 reset_vector) return -ENOMEM; for (int i = 0; i < nr_pfn_mapped; i++) { - unsigned long mstart, mend; - mstart = pfn_mapped[i].start << PAGE_SHIFT; mend = pfn_mapped[i].end << PAGE_SHIFT; if (kernel_ident_mapping_init(&info, pgd, mstart, mend)) { @@ -147,14 +94,24 @@ static int __init acpi_mp_setup_reset(u64 reset_vector) } } - if (kernel_ident_mapping_init(&info, pgd, - PAGE_ALIGN_DOWN(reset_vector), - PAGE_ALIGN(reset_vector + 1))) { + mstart = PAGE_ALIGN_DOWN(reset_vector); + mend = mstart + PAGE_SIZE; + if (kernel_ident_mapping_init(&info, pgd, mstart, mend)) { kernel_ident_mapping_free(&info, pgd); return -ENOMEM; } - if (init_transition_pgtable(pgd)) { + /* + * Make sure asm_acpi_mp_play_dead() is present in the identity mapping + * at the same place as in the kernel page tables. + * asm_acpi_mp_play_dead() switches to the identity mapping and the + * function must be present at the same spot in the virtual address space + * before and after switching page tables. + */ + info.offset = __START_KERNEL_map - phys_base; + mstart = PAGE_ALIGN_DOWN(__pa(asm_acpi_mp_play_dead)); + mend = mstart + PAGE_SIZE; + if (kernel_ident_mapping_init(&info, pgd, mstart, mend)) { kernel_ident_mapping_free(&info, pgd); return -ENOMEM; }