From mboxrd@z Thu Jan 1 00:00:00 1970 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=-12.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 93433C433E1 for ; Mon, 24 Aug 2020 08:56:43 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (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 732D4206F0 for ; Mon, 24 Aug 2020 08:56:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 732D4206F0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=8bytes.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=virtualization-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 5897D878AF; Mon, 24 Aug 2020 08:56:43 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LbefiUc1Xh77; Mon, 24 Aug 2020 08:56:42 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by hemlock.osuosl.org (Postfix) with ESMTP id AFBBD8778F; Mon, 24 Aug 2020 08:56:42 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id A77FAC016F; Mon, 24 Aug 2020 08:56:42 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 2CF95C016F for ; Mon, 24 Aug 2020 08:56:41 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id F2F812051A for ; Mon, 24 Aug 2020 08:56:40 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TEnNUph0h-QV for ; Mon, 24 Aug 2020 08:56:34 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from theia.8bytes.org (8bytes.org [81.169.241.247]) by silver.osuosl.org (Postfix) with ESMTPS id 363C1207A9 for ; Mon, 24 Aug 2020 08:56:16 +0000 (UTC) Received: from cap.home.8bytes.org (p4ff2bb8d.dip0.t-ipconnect.de [79.242.187.141]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by theia.8bytes.org (Postfix) with ESMTPSA id DB23EF6F; Mon, 24 Aug 2020 10:56:06 +0200 (CEST) From: Joerg Roedel To: x86@kernel.org Subject: [PATCH v6 36/76] x86/head/64: Load IDT earlier Date: Mon, 24 Aug 2020 10:54:31 +0200 Message-Id: <20200824085511.7553-37-joro@8bytes.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200824085511.7553-1-joro@8bytes.org> References: <20200824085511.7553-1-joro@8bytes.org> MIME-Version: 1.0 Cc: Juergen Gross , Tom Lendacky , Joerg Roedel , Mike Stunes , Kees Cook , kvm@vger.kernel.org, Peter Zijlstra , Cfir Cohen , Joerg Roedel , Dave Hansen , linux-kernel@vger.kernel.org, Sean Christopherson , virtualization@lists.linux-foundation.org, Martin Radev , Masami Hiramatsu , Andy Lutomirski , hpa@zytor.com, Erdem Aktas , David Rientjes , Dan Williams , Jiri Slaby X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" From: Joerg Roedel Load the IDT right after switching to virtual addresses in head_64.S so that the kernel can handle #VC exceptions. Signed-off-by: Joerg Roedel Link: https://lore.kernel.org/r/20200724160336.5435-36-joro@8bytes.org --- arch/x86/include/asm/setup.h | 3 +++ arch/x86/kernel/head64.c | 3 +++ arch/x86/kernel/head_64.S | 5 +++++ arch/x86/kernel/idt.c | 23 +++++++++++++++++++++++ 4 files changed, 34 insertions(+) diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h index 8aa6ba0427b0..5c09f50ecf1c 100644 --- a/arch/x86/include/asm/setup.h +++ b/arch/x86/include/asm/setup.h @@ -50,6 +50,8 @@ extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp extern unsigned long __startup_secondary_64(void); extern void startup_64_setup_env(unsigned long physbase); extern int early_make_pgtable(unsigned long address); +extern void early_idt_setup_early_handler(unsigned long physaddr); +extern void early_load_idt(void); #ifdef CONFIG_X86_INTEL_MID extern void x86_intel_mid_early_setup(void); @@ -66,6 +68,7 @@ static inline void x86_ce4100_early_setup(void) { } #ifndef _SETUP #include +#include #include /* diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index 8703292a35e9..096b09d06d1c 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -286,6 +286,9 @@ unsigned long __head __startup_64(unsigned long physaddr, } } + /* Setup IDT with early handlers */ + early_idt_setup_early_handler(physaddr); + /* * Return the SME encryption mask (if SME is active) to be used as a * modifier for the initial pgdir entry programmed into CR3. diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S index a5e1939d1dc9..28de83fecda3 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -206,6 +206,11 @@ SYM_CODE_START(secondary_startup_64) */ movq initial_stack(%rip), %rsp + /* Load IDT */ + pushq %rsi + call early_load_idt + popq %rsi + /* Check if nx is implemented */ movl $0x80000001, %eax cpuid diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c index c19773174221..e2777cc264f5 100644 --- a/arch/x86/kernel/idt.c +++ b/arch/x86/kernel/idt.c @@ -10,6 +10,7 @@ #include #include #include +#include struct idt_data { unsigned int vector; @@ -385,3 +386,25 @@ void __init alloc_intr_gate(unsigned int n, const void *addr) if (!WARN_ON(test_and_set_bit(n, system_vectors))) set_intr_gate(n, addr); } + +void __init early_idt_setup_early_handler(unsigned long physaddr) +{ + gate_desc *idt; + int i; + + idt = fixup_pointer(idt_table, physaddr); + + for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) { + struct idt_data data; + gate_desc desc; + + init_idt_data(&data, i, early_idt_handler_array[i]); + idt_init_desc(&desc, &data); + native_write_idt_entry(idt, i, &desc); + } +} + +void early_load_idt(void) +{ + load_idt(&idt_descr); +} -- 2.28.0 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization