From patchwork Wed Mar 3 00:22:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pasha Tatashin X-Patchwork-Id: 12112429 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8EA14C433E0 for ; Wed, 3 Mar 2021 00:22:55 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 183ED64FA9 for ; Wed, 3 Mar 2021 00:22:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 183ED64FA9 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=soleen.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 716668D010A; Tue, 2 Mar 2021 19:22:48 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 6CEBF8D0101; Tue, 2 Mar 2021 19:22:48 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 42DAC8D010A; Tue, 2 Mar 2021 19:22:48 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0030.hostedemail.com [216.40.44.30]) by kanga.kvack.org (Postfix) with ESMTP id 549F98D0101 for ; Tue, 2 Mar 2021 19:22:47 -0500 (EST) Received: from smtpin25.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 14AE98249980 for ; Wed, 3 Mar 2021 00:22:47 +0000 (UTC) X-FDA: 77876662374.25.4ED9549 Received: from mail-qk1-f171.google.com (mail-qk1-f171.google.com [209.85.222.171]) by imf06.hostedemail.com (Postfix) with ESMTP id D91ADC0007C3 for ; Wed, 3 Mar 2021 00:22:45 +0000 (UTC) Received: by mail-qk1-f171.google.com with SMTP id g185so3058616qkf.6 for ; Tue, 02 Mar 2021 16:22:46 -0800 (PST) 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=tCKT8dQy3j0JXLfUAkLHptP8jUCHy5Mtlem3XeT2uzw=; b=DhKQLAF9gGWy+VQ4vEFv8vyOX67wEL5g+Ibv7M6YGg2GyOsWVpcLrO8l/KN0L5IZAc RxUn6cVCLaJEnn1GP49dKDyfXS2S5pAiSCfkfdBs3217gnmAIZ5KJF9kQwUjn08WVXoD eVb/xAgyG6HCeSJF560IMqYfvfngZgwPC0Gmto4sET2VI1otYwBlS0xkYWwsZi+5Y5wu CiGi9fY2dPpyuaQ0XGJefCQyLBo5uJyBd2Zt5atz0jeIcn/r/0MV3W88wPds72buWKfc OID9WDzMy8wulcxcHzZaME1ROXYkHzAQzPpJnO8T7pARrDaLZCrx6HDCoBT9CIwWJebN jArg== 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=tCKT8dQy3j0JXLfUAkLHptP8jUCHy5Mtlem3XeT2uzw=; b=qHdghZhhDlxPoafH064IZgDnEGT9J/CX6rtO6aWWef4c1VZ3Z77bXRDJSXTSTUUI90 4cKjGUZEKPsw1vImhNrQv0mZSRLdOVZ648rmGCmwaZ2jtMGC54BoaLyidIpdRggCKg17 blNAUVtgJIbrDOEPn9v8eGZaBJ659TdR3/PKmcP0gsPo6xxFEyCaMWDflh7gpL5VYXbX P8vs2Cu4crtVGq8LaTDgeEfdlNLzOAXx1AAD5SmXf3mN9ICaHslbUdH4FonQWrGEeLo4 QgJz6bOEVjpxS5v9xWe5LQOxgZpT4pMPOsTNzKZCZp1oKQOtzQsFXBBcxYnA+6dR2kzu FSrQ== X-Gm-Message-State: AOAM53301ZPA0KUtKvcB4ltuKCDYDbkkjV72Pvqi0v0vHW1AI+0+nQPh Th2w/iQiD1A0FgGLLRNZiljtE6DMKHeeQw== X-Google-Smtp-Source: ABdhPJz8rw5a4BVvRDYMXLHg55FhSEneNbuZ0yxoLq7h3VikY6X4yYzXWKIMomKucbL+q9Rc23LaTA== X-Received: by 2002:a05:620a:13a5:: with SMTP id m5mr2243290qki.498.1614730966050; Tue, 02 Mar 2021 16:22:46 -0800 (PST) Received: from localhost.localdomain (c-73-69-118-222.hsd1.nh.comcast.net. [73.69.118.222]) by smtp.gmail.com with ESMTPSA id r3sm16690512qkm.129.2021.03.02.16.22.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Mar 2021 16:22:45 -0800 (PST) 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, maz@kernel.org, james.morse@arm.com, vladimir.murzin@arm.com, matthias.bgg@gmail.com, linux-mm@kvack.org, mark.rutland@arm.com, steve.capper@arm.com, rfontana@redhat.com, tglx@linutronix.de, selindag@gmail.com, tyhicks@linux.microsoft.com Subject: [PATCH v12 10/17] arm64: kexec: pass kimage as the only argument to relocation function Date: Tue, 2 Mar 2021 19:22:23 -0500 Message-Id: <20210303002230.1083176-11-pasha.tatashin@soleen.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210303002230.1083176-1-pasha.tatashin@soleen.com> References: <20210303002230.1083176-1-pasha.tatashin@soleen.com> MIME-Version: 1.0 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: D91ADC0007C3 X-Stat-Signature: pkdh7kgspedqouu738wb534ypjrst14r Received-SPF: none (soleen.com>: No applicable sender policy available) receiver=imf06; identity=mailfrom; envelope-from=""; helo=mail-qk1-f171.google.com; client-ip=209.85.222.171 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1614730965-788109 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: Currently, kexec relocation function (arm64_relocate_new_kernel) accepts the following arguments: head: start of array that contains relocation information. entry: entry point for new kernel or purgatory. dtb_mem: first and only argument to entry. The number of arguments cannot be easily expended, because this function is also called from HVC_SOFT_RESTART, which preserves only three arguments. And, also arm64_relocate_new_kernel is written in assembly but called without stack, thus no place to move extra arguments to free registers. Soon, we will need to pass more arguments: once we enable MMU we will need to pass information about page tables. Pass kimage to arm64_relocate_new_kernel, and teach it to get the required fields from kimage. Suggested-by: James Morse Signed-off-by: Pavel Tatashin --- arch/arm64/kernel/asm-offsets.c | 7 +++++++ arch/arm64/kernel/machine_kexec.c | 6 ++++-- arch/arm64/kernel/relocate_kernel.S | 10 ++++------ 3 files changed, 15 insertions(+), 8 deletions(-) diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c index a36e2fc330d4..0c92e193f866 100644 --- a/arch/arm64/kernel/asm-offsets.c +++ b/arch/arm64/kernel/asm-offsets.c @@ -9,6 +9,7 @@ #include #include +#include #include #include #include @@ -153,6 +154,12 @@ int main(void) DEFINE(PTRAUTH_USER_KEY_APGA, offsetof(struct ptrauth_keys_user, apga)); DEFINE(PTRAUTH_KERNEL_KEY_APIA, offsetof(struct ptrauth_keys_kernel, apia)); BLANK(); +#endif +#ifdef CONFIG_KEXEC_CORE + DEFINE(KIMAGE_ARCH_DTB_MEM, offsetof(struct kimage, arch.dtb_mem)); + DEFINE(KIMAGE_HEAD, offsetof(struct kimage, head)); + DEFINE(KIMAGE_START, offsetof(struct kimage, start)); + BLANK(); #endif return 0; } diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_kexec.c index b150b65f0b84..2e734e4ae12e 100644 --- a/arch/arm64/kernel/machine_kexec.c +++ b/arch/arm64/kernel/machine_kexec.c @@ -83,6 +83,8 @@ static void kexec_list_flush(struct kimage *kimage) { kimage_entry_t *entry; + __flush_dcache_area(kimage, sizeof(*kimage)); + for (entry = &kimage->head; ; entry++) { unsigned int flag; void *addr; @@ -198,8 +200,8 @@ void machine_kexec(struct kimage *kimage) restart(is_hyp_callable(), kimage->start, kimage->arch.dtb_mem, 0, 0); } else { - cpu_soft_restart(kimage->arch.kern_reloc, kimage->head, - kimage->start, kimage->arch.dtb_mem); + cpu_soft_restart(kimage->arch.kern_reloc, virt_to_phys(kimage), + 0, 0); } BUG(); /* Should never get here. */ diff --git a/arch/arm64/kernel/relocate_kernel.S b/arch/arm64/kernel/relocate_kernel.S index 718037bef560..36b4496524c3 100644 --- a/arch/arm64/kernel/relocate_kernel.S +++ b/arch/arm64/kernel/relocate_kernel.S @@ -27,9 +27,7 @@ */ SYM_CODE_START(arm64_relocate_new_kernel) /* Setup the list loop variables. */ - mov x18, x2 /* x18 = dtb address */ - mov x17, x1 /* x17 = kimage_start */ - mov x16, x0 /* x16 = kimage_head */ + ldr x16, [x0, #KIMAGE_HEAD] /* x16 = kimage_head */ mov x14, xzr /* x14 = entry ptr */ mov x13, xzr /* x13 = copy dest */ raw_dcache_line_size x15, x1 /* x15 = dcache line size */ @@ -63,12 +61,12 @@ SYM_CODE_START(arm64_relocate_new_kernel) isb /* Start new image. */ - mov x0, x18 + ldr x4, [x0, #KIMAGE_START] /* relocation start */ + ldr x0, [x0, #KIMAGE_ARCH_DTB_MEM] /* dtb address */ mov x1, xzr mov x2, xzr mov x3, xzr - br x17 - + br x4 SYM_CODE_END(arm64_relocate_new_kernel) .align 3 /* To keep the 64-bit values below naturally aligned. */