From patchwork Fri Oct 4 18:52:34 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pasha Tatashin X-Patchwork-Id: 11175233 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1CF38139A for ; Fri, 4 Oct 2019 18:59:28 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id E85AD2084D for ; Fri, 4 Oct 2019 18:59:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="sXxuPQI+"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=soleen.com header.i=@soleen.com header.b="AREiD122" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E85AD2084D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=soleen.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Cc:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=5Rbay81oc5kdwtoyo3adX9khQMmrtvu3K+eBnykAr0k=; b=sXxuPQI+mZpg7w 1W9QHgg9vvXscsbCB0D4GtB/7/ShGLdKQEeXwPqV5qrXTiKP6Jc/ErtrMlICouu7ZQWh6BrIxWeR0 NsHriu621toHVt51Qy0pOY5y4qk4o/nhHkZ5GzTuFaCJAH/qmK0IuRXUIGHNM6Cn95lB2uBx6nzhq fB35DK7wUpoIcVxSHSfA+a27JIFijgVfnCowwiNZKF2EOpVd2NJ8U6/Kcuo9dr8GXotte4aYRnTmW Hw9kIuzch4t2vV2Pyq+TNCl2c9pTPAAUcc6apm8n7St3XyWRmZODbwwqRFubML4lDHL/K5KPEAiwR IlyZwVjAfWbBhLn1UpmA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1iGSnW-0000jj-Rm; Fri, 04 Oct 2019 18:59:26 +0000 Received: from mail-qk1-x741.google.com ([2607:f8b0:4864:20::741]) by bombadil.infradead.org with esmtps (Exim 4.92.2 #3 (Red Hat Linux)) id 1iGShL-0002P5-Nc for linux-arm-kernel@lists.infradead.org; Fri, 04 Oct 2019 18:53:13 +0000 Received: by mail-qk1-x741.google.com with SMTP id p10so6738287qkg.8 for ; Fri, 04 Oct 2019 11:53:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=soleen.com; s=google; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=T59+jejKmTBkrYoU4MBF6HUfmWY8hcdgE9D78tkOOv0=; b=AREiD122O+EyEBzcC0F6MSOJNK6aS172ZXBLoZSFF1TnyoY7obZr7CxZEqxt1JDub9 F2dcK4jWvSch9DcAA8bQCv3b5XtlvaAalCQkJGd/Y8njGydgaafJnlf9qjkNvJ3sLF0C P5ozlQclW4UdkGRUXL1RAoVDOQrqmWdXSZnPJ3xcFMixABuxehZUyjJt2YKptI5F7wzC 7GOX8X6zk2D2OCbGv7zcUNWPUFTX/+QliPefYAkPDJflMFpdVRgNbQ80yxdsHg66yWAg mAB6GZAbtfX1PF9Et5IfR2C5tndyyR0FGmC/e17nm7jBCgAfX364bKZtau9IMSB95S9T QmmA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=T59+jejKmTBkrYoU4MBF6HUfmWY8hcdgE9D78tkOOv0=; b=KuHLkJFKEPhUWl/tAnOjy/+vl9ZNWDjBLIfhvyFyoou2yV0m+wueI4UbFteTP2WxDD 0gct8XjxAwbVEkcKRaajaukb7m0X1w8NdtwIgW5nsxAPff+hnNr+qNVc1+lgcSzaKebM ANSOo3D0sexzlgKirQSMboW0Pm7HbA+ttaTMLwGwAHeA+7PjHKgPVfqJD9klF2v368NO D4n74YDrLUGrJyoFg1jYzS3LjlVxmKXDXO1Y02OCq1ii6nuMtQLsNx4a8JK4e83uvCc+ W25wA/Tm6amWTRyiLBdJKne5c/bEhEARftvcrEuA+FnLqJxzfEj40YwfA0rv49B0rjwJ 1n5g== X-Gm-Message-State: APjAAAVeGdReP5IdvscDiHD4qPsa0sNkSOjtmJk8VB7T3DmCjdWKQjbH jwbBxgbchlfZ/QIfQ1R+yITDjw== X-Google-Smtp-Source: APXvYqwwREiwz4Adn8lUpFrOrehnB/pHocC6S1gdOr3sdH3QYWHET4BJUxiUbjsi0/nzz9Zgd37qrQ== X-Received: by 2002:a37:ad8:: with SMTP id 207mr12027737qkk.38.1570215181379; Fri, 04 Oct 2019 11:53:01 -0700 (PDT) Received: from localhost.localdomain (c-73-69-118-222.hsd1.nh.comcast.net. [73.69.118.222]) by smtp.gmail.com with ESMTPSA id p77sm4042514qke.6.2019.10.04.11.53.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Oct 2019 11:53:00 -0700 (PDT) From: Pavel Tatashin To: pasha.tatashin@soleen.com, jmorris@namei.org, sashal@kernel.org, ebiederm@xmission.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, corbet@lwn.net, catalin.marinas@arm.com, will@kernel.org, linux-arm-kernel@lists.infradead.org, marc.zyngier@arm.com, james.morse@arm.com, vladimir.murzin@arm.com, matthias.bgg@gmail.com, bhsharma@redhat.com, linux-mm@kvack.org, mark.rutland@arm.com Subject: [PATCH v6 17/17] arm64: kexec: enable MMU during kexec relocation Date: Fri, 4 Oct 2019 14:52:34 -0400 Message-Id: <20191004185234.31471-18-pasha.tatashin@soleen.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191004185234.31471-1-pasha.tatashin@soleen.com> References: <20191004185234.31471-1-pasha.tatashin@soleen.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191004_115303_946050_A48FE742 X-CRM114-Status: GOOD ( 15.96 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:741 listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Now, that we have transitional page tables configured, temporarily enable MMU to allow faster relocation of segments to final destination. The performance data: for a moderate size kernel + initramfs: 25M the relocation was taking 0.382s, with enabled MMU it now takes 0.019s only or x20 improvement. The time is proportional to the size of relocation, therefore if initramfs is larger, 100M it could take over a second. Also, remove reloc_arg->head, as it is not needed anymore once MMU is enabled. Signed-off-by: Pavel Tatashin --- arch/arm64/include/asm/kexec.h | 2 - arch/arm64/kernel/asm-offsets.c | 1 - arch/arm64/kernel/machine_kexec.c | 1 - arch/arm64/kernel/relocate_kernel.S | 136 +++++++++++++++++----------- 4 files changed, 84 insertions(+), 56 deletions(-) diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h index 450d8440f597..ad81ed3e5751 100644 --- a/arch/arm64/include/asm/kexec.h +++ b/arch/arm64/include/asm/kexec.h @@ -109,7 +109,6 @@ extern const unsigned long kexec_el1_sync_size; ((UL(0xffffffffffffffff) - PAGE_OFFSET) >> 1) + 1) /* * kern_reloc_arg is passed to kernel relocation function as an argument. - * head kimage->head, allows to traverse through relocation segments. * entry_addr kimage->start, where to jump from relocation function (new * kernel, or purgatory entry address). * kern_arg0 first argument to kernel is its dtb address. The other @@ -125,7 +124,6 @@ extern const unsigned long kexec_el1_sync_size; * copy_len Number of bytes that need to be copied */ struct kern_reloc_arg { - unsigned long head; unsigned long entry_addr; unsigned long kern_arg0; unsigned long kern_arg1; diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c index 7c2ba09a8ceb..13ad00b1b90f 100644 --- a/arch/arm64/kernel/asm-offsets.c +++ b/arch/arm64/kernel/asm-offsets.c @@ -129,7 +129,6 @@ int main(void) DEFINE(SDEI_EVENT_PRIORITY, offsetof(struct sdei_registered_event, priority)); #endif #ifdef CONFIG_KEXEC_CORE - DEFINE(KRELOC_HEAD, offsetof(struct kern_reloc_arg, head)); DEFINE(KRELOC_ENTRY_ADDR, offsetof(struct kern_reloc_arg, entry_addr)); DEFINE(KRELOC_KERN_ARG0, offsetof(struct kern_reloc_arg, kern_arg0)); DEFINE(KRELOC_KERN_ARG1, offsetof(struct kern_reloc_arg, kern_arg1)); diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_kexec.c index 71479013dd24..970892970bab 100644 --- a/arch/arm64/kernel/machine_kexec.c +++ b/arch/arm64/kernel/machine_kexec.c @@ -196,7 +196,6 @@ int machine_kexec_post_load(struct kimage *kimage) kimage->arch.kern_reloc = kern_reloc; kimage->arch.kern_reloc_arg = __pa(kern_reloc_arg); - kern_reloc_arg->head = kimage->head; kern_reloc_arg->entry_addr = kimage->start; kern_reloc_arg->el2_vector = el2_vector; kern_reloc_arg->kern_arg0 = kimage->arch.dtb_mem; diff --git a/arch/arm64/kernel/relocate_kernel.S b/arch/arm64/kernel/relocate_kernel.S index 14243a678277..96ff6760bd9c 100644 --- a/arch/arm64/kernel/relocate_kernel.S +++ b/arch/arm64/kernel/relocate_kernel.S @@ -4,6 +4,8 @@ * * Copyright (C) Linaro. * Copyright (C) Huawei Futurewei Technologies. + * Copyright (c) 2019, Microsoft Corporation. + * Pavel Tatashin */ #include @@ -14,6 +16,49 @@ #include #include +/* Invalidae TLB */ +.macro tlb_invalidate + dsb sy + dsb ish + tlbi vmalle1 + dsb ish + isb +.endm + +/* Turn-off mmu at level specified by sctlr */ +.macro turn_off_mmu sctlr, tmp1, tmp2 + mrs \tmp1, \sctlr + ldr \tmp2, =SCTLR_ELx_FLAGS + bic \tmp1, \tmp1, \tmp2 + pre_disable_mmu_workaround + msr \sctlr, \tmp1 + isb +.endm + +/* Turn-on mmu at level specified by sctlr */ +.macro turn_on_mmu sctlr, tmp1, tmp2 + mrs \tmp1, \sctlr + ldr \tmp2, =SCTLR_ELx_FLAGS + orr \tmp1, \tmp1, \tmp2 + msr \sctlr, \tmp1 + ic iallu + dsb nsh + isb +.endm + +/* + * Set ttbr0 and ttbr1, called while MMU is disabled, so no need to temporarily + * set zero_page table. Invalidate TLB after new tables are set. + */ +.macro set_ttbr arg, tmp + ldr \tmp, [\arg, #KRELOC_TRANS_TTBR0] + msr ttbr0_el1, \tmp + ldr \tmp, [\arg, #KRELOC_TRANS_TTBR1] + offset_ttbr1 \tmp + msr ttbr1_el1, \tmp + isb +.endm + /* * arm64_relocate_new_kernel - Put a 2nd stage image in place and boot it. * @@ -24,65 +69,52 @@ * symbols arm64_relocate_new_kernel and arm64_relocate_new_kernel_end. The * machine_kexec() routine will copy arm64_relocate_new_kernel to the kexec * safe memory that has been set up to be preserved during the copy operation. + * + * This function temporarily enables MMU if kernel relocation is needed. + * Also, if we enter this function at EL2 on non-VHE kernel, we temporarily go + * to EL1 to enable MMU, and escalate back to EL2 at the end to do the jump to + * the new kernel. This is determined by presence of el2_vector. */ ENTRY(arm64_relocate_new_kernel) - /* Clear the sctlr_el2 flags. */ - mrs x2, CurrentEL - cmp x2, #CurrentEL_EL2 + mrs x1, CurrentEL + cmp x1, #CurrentEL_EL2 b.ne 1f - mrs x2, sctlr_el2 - ldr x1, =SCTLR_ELx_FLAGS - bic x2, x2, x1 - pre_disable_mmu_workaround - msr sctlr_el2, x2 - isb -1: /* Check if the new image needs relocation. */ - ldr x16, [x0, #KRELOC_HEAD] /* x16 = kimage_head */ - tbnz x16, IND_DONE_BIT, .Ldone - raw_dcache_line_size x15, x1 /* x15 = dcache line size */ -.Lloop: - and x12, x16, PAGE_MASK /* x12 = addr */ - /* Test the entry flags. */ -.Ltest_source: - tbz x16, IND_SOURCE_BIT, .Ltest_indirection - - /* Invalidate dest page to PoC. */ - mov x2, x13 - add x20, x2, #PAGE_SIZE - sub x1, x15, #1 - bic x2, x2, x1 -2: dc ivac, x2 - add x2, x2, x15 - cmp x2, x20 - b.lo 2b - dsb sy - - copy_page x13, x12, x1, x2, x3, x4, x5, x6, x7, x8 - b .Lnext -.Ltest_indirection: - tbz x16, IND_INDIRECTION_BIT, .Ltest_destination - mov x14, x12 /* ptr = addr */ - b .Lnext -.Ltest_destination: - tbz x16, IND_DESTINATION_BIT, .Lnext - mov x13, x12 /* dest = addr */ -.Lnext: - ldr x16, [x14], #8 /* entry = *ptr++ */ - tbz x16, IND_DONE_BIT, .Lloop /* while (!(entry & DONE)) */ -.Ldone: - /* wait for writes from copy_page to finish */ - dsb nsh - ic iallu - dsb nsh - isb - - /* Start new image. */ - ldr x4, [x0, #KRELOC_ENTRY_ADDR] /* x4 = kimage_start */ + turn_off_mmu sctlr_el2, x1, x2 /* Turn off MMU at EL2 */ +1: mov x20, xzr /* x20 will hold vector value */ + ldr x11, [x0, #KRELOC_COPY_LEN] + cbz x11, 5f /* Check if need to relocate */ + ldr x20, [x0, #KRELOC_EL2_VECTOR] + cbz x20, 2f /* need to reduce to EL1? */ + msr vbar_el2, x20 /* el2_vector present, means */ + adr x1, 2f /* we will do copy in el1 but */ + msr elr_el2, x1 /* do final jump from el2 */ + eret /* Reduce to EL1 */ +2: set_ttbr x0, x1 /* Set our page tables */ + tlb_invalidate + turn_on_mmu sctlr_el1, x1, x2 /* Turn MMU back on */ + ldr x1, [x0, #KRELOC_DST_ADDR]; + ldr x2, [x0, #KRELOC_SRC_ADDR]; + mov x12, x1 /* x12 dst backup */ +3: copy_page x1, x2, x3, x4, x5, x6, x7, x8, x9, x10 + sub x11, x11, #PAGE_SIZE + cbnz x11, 3b /* page copy loop */ + raw_dcache_line_size x2, x3 /* x2 = dcache line size */ + sub x3, x2, #1 /* x3 = dcache_size - 1 */ + bic x12, x12, x3 +4: dc cvau, x12 /* Flush D-cache */ + add x12, x12, x2 + cmp x12, x1 /* Compare to dst + len */ + b.ne 4b /* D-cache flush loop */ + turn_off_mmu sctlr_el1, x1, x2 /* Turn off MMU */ + tlb_invalidate /* Invalidate TLB */ +5: ldr x4, [x0, #KRELOC_ENTRY_ADDR] /* x4 = kimage_start */ ldr x3, [x0, #KRELOC_KERN_ARG3] ldr x2, [x0, #KRELOC_KERN_ARG2] ldr x1, [x0, #KRELOC_KERN_ARG1] ldr x0, [x0, #KRELOC_KERN_ARG0] /* x0 = dtb address */ - br x4 + cbnz x20, 6f /* need to escalate to el2? */ + br x4 /* Jump to new world */ +6: hvc #0 /* enters kexec_el1_sync */ .ltorg .Larm64_relocate_new_kernel_end: END(arm64_relocate_new_kernel)