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[23.128.96.18]) by mx.google.com with ESMTP id q2si2566537ejf.197.2020.10.07.16.14.38; Wed, 07 Oct 2020 16:15:01 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728526AbgJGTx6 (ORCPT + 99 others); Wed, 7 Oct 2020 15:53:58 -0400 Received: from mail-qk1-f193.google.com ([209.85.222.193]:41389 "EHLO mail-qk1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728476AbgJGTx4 (ORCPT ); Wed, 7 Oct 2020 15:53:56 -0400 Received: by mail-qk1-f193.google.com with SMTP id b69so4359055qkg.8 for ; Wed, 07 Oct 2020 12:53:56 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=xP9l6h0pLyt3eoh/GbILll4OJvuxDhCM2RX4gvFhu+A=; b=i7Nb63mff+2T4tryal45l4fw3Sjnt4HJzS9dHsWUF831KZHxO/d8YbQWriVSmPKeLb wvD2o2adjEisTTz7TsUukK2P0hjtOWTiG2y5/rcsccRqSAZnCs1D9OFO4NlyVK00PP/p PmmkTHVjc15C2nY2ZRnzr9QNrOOCTHMAv2u+kuWnU+mk9cwWEQaSntTStW2nkUFhD3eR VRH5Kir14c6CyRQgjWajHqUp1knrYlRhs+agQRT2HI3//60lp4yHDQK4Te2WLVw13/Re Jqq4qg0oqWqG9ju13K4Bfu+s8XQL2LmuY12xWNZIGLEICyEoY0wEqIP+xSK4iMrrGGo9 JMng== X-Gm-Message-State: AOAM533f1zo1Br41IloJmsU9xC4GH31lriPQfY4vm99z19se9a+a0pZ4 nSgahTgUOCuen/e2Vi/AK1TSYUPNWXtFrw== X-Received: by 2002:a05:620a:851:: with SMTP id u17mr4518967qku.344.1602100435410; Wed, 07 Oct 2020 12:53:55 -0700 (PDT) Received: from rani.riverdale.lan ([2001:470:1f07:5f3::b55f]) by smtp.gmail.com with ESMTPSA id k20sm2287658qtm.44.2020.10.07.12.53.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Oct 2020 12:53:54 -0700 (PDT) From: Arvind Sankar To: x86@kernel.org, Joerg Roedel Cc: linux-kernel@vger.kernel.org Subject: [PATCH 3/5] x86/boot/64: Change add_identity_map() to take size for ease of use Date: Wed, 7 Oct 2020 15:53:49 -0400 Message-Id: <20201007195351.776555-4-nivedita@alum.mit.edu> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201007195351.776555-1-nivedita@alum.mit.edu> References: <20201007195351.776555-1-nivedita@alum.mit.edu> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Change back the arguments of add_identity_map() to (start, size) instead of (start, end). This reverts 21cf2372618e ("x86/boot/compressed/64: Change add_identity_map() to take start and end") since we will soon have more callers that know the size rather than the end address. This also makes the #PF handler print the original CR2 value in case of error, instead of after aligning to PMD_SIZE. Signed-off-by: Arvind Sankar --- arch/x86/boot/compressed/ident_map_64.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/arch/x86/boot/compressed/ident_map_64.c b/arch/x86/boot/compressed/ident_map_64.c index 063a60edcf99..070cda70aef3 100644 --- a/arch/x86/boot/compressed/ident_map_64.c +++ b/arch/x86/boot/compressed/ident_map_64.c @@ -90,8 +90,9 @@ static struct x86_mapping_info mapping_info; /* * Adds the specified range to the identity mappings. */ -static void add_identity_map(unsigned long start, unsigned long end) +static void add_identity_map(unsigned long start, unsigned long size) { + unsigned long end = start + size; int ret; /* Align boundary to 2M. */ @@ -152,7 +153,7 @@ void initialize_identity_maps(void) * New page-table is set up - map the kernel image and load it * into cr3. */ - add_identity_map((unsigned long)_head, (unsigned long)_end); + add_identity_map((unsigned long)_head, (unsigned long)_end - (unsigned long)_head); write_cr3(top_level_pgt); } @@ -322,14 +323,10 @@ static void do_pf_error(const char *msg, unsigned long error_code, void do_boot_page_fault(struct pt_regs *regs, unsigned long error_code) { unsigned long address = native_read_cr2(); - unsigned long end; bool ghcb_fault; ghcb_fault = sev_es_check_ghcb_fault(address); - address &= PMD_MASK; - end = address + PMD_SIZE; - /* * Check for unexpected error codes. Unexpected are: * - Faults on present pages @@ -345,5 +342,5 @@ void do_boot_page_fault(struct pt_regs *regs, unsigned long error_code) * Error code is sane - now identity map the 2M region around * the faulting address. */ - add_identity_map(address, end); + add_identity_map(address & PMD_MASK, PMD_SIZE); } -- 2.26.2