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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable 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 BDE46C4332D for ; Thu, 14 Jan 2021 01:48:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9BB4C2343B for ; Thu, 14 Jan 2021 01:48:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728410AbhANBsW (ORCPT ); Wed, 13 Jan 2021 20:48:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56036 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727392AbhANAjv (ORCPT ); Wed, 13 Jan 2021 19:39:51 -0500 Received: from mail-qv1-xf49.google.com (mail-qv1-xf49.google.com [IPv6:2607:f8b0:4864:20::f49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B2DC1C0617B1 for ; Wed, 13 Jan 2021 16:37:50 -0800 (PST) Received: by mail-qv1-xf49.google.com with SMTP id l3so2944098qvr.10 for ; Wed, 13 Jan 2021 16:37:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:reply-to:date:in-reply-to:message-id:mime-version:references :subject:from:to:cc; bh=DDUHIUBA8SLHvStbYmjdJVTHYjMXIrwXrhEB8ai7MVY=; b=qkzN5/B31jy88ZpNpPR+BBPPcUB8nL0++4Spb8fCnQwaLGL/YbByi7M3SGS4Z/n0+s C1xB4mFr1fLgRi3PzFzYfk7OKY8HYlsFDgN9x/UfTJAOxU7O7mj8rnd1+B8tsBm5tpk1 qAH+JQRCZ7bpI06i1Cr5Se4FUewwXp3t+JkMnGESZFaV58c66zw2AXq5onH850wcGBBL nVYEQ06OYzdxeR6eWL7YgpStup3OB5WFL5coXbCvYhGP9u/Rfk+8ddoOsL2yL/gh5hW1 qXTYRfVA7vJuSxCKmAcq7AsJw1FEsZnU10U1JoTcyGS/ugOgRT5iwn73LcJK7BIV5PCE tm+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:reply-to:date:in-reply-to:message-id :mime-version:references:subject:from:to:cc; bh=DDUHIUBA8SLHvStbYmjdJVTHYjMXIrwXrhEB8ai7MVY=; b=koSHkVYsxxyl5UnyFOPl9tFsOLxljsP9WquZZ3LqCbPoJ2nZ0QIVFe/HqjZEDR03Qa HnV8KBsw+9ItBwAM8/MLEY9RO4o1emQ0+HD7039l1lgW1k6wIuADLsMBGqAi7Ngviv38 7TfBrLI+4BMfEqVrcs4eJRFKAzbqYACXe3ZKZzsU5uJlCNFzNorkjnIeawR7n38lPWHS wOwZLeNbclgz1B2vtZrviOxRSKwu7xkpj4IWg8HnJVxAz1wQon8KBDwFYCQYdfUzbJ4l nlTCFaoX9HzZwVAA5CSV4egS1EF1LNxJZeD/M5nEQZGF1PTsy1iHbYxccfxw+CK9l1/H ONeQ== X-Gm-Message-State: AOAM532B8ewzeTwo5LavMDF5FoE0eQMgqexSVtfbfdHfXu+v1zQe4pfv 3u5sIYhYeuLNQz0aDUqA2nsZ5q1amhc= X-Google-Smtp-Source: ABdhPJxyDhm3M2JAmEWge+qYJWZw2joo4TnBbgEXhE0VgsY14p15rC2IBck+hLLI1HjzlM8vifZUP1PsJbU= Sender: "seanjc via sendgmr" X-Received: from seanjc798194.pdx.corp.google.com ([2620:15c:f:10:1ea0:b8ff:fe73:50f5]) (user=seanjc job=sendgmr) by 2002:a5b:482:: with SMTP id n2mr6421468ybp.25.1610584669838; Wed, 13 Jan 2021 16:37:49 -0800 (PST) Reply-To: Sean Christopherson Date: Wed, 13 Jan 2021 16:37:00 -0800 In-Reply-To: <20210114003708.3798992-1-seanjc@google.com> Message-Id: <20210114003708.3798992-7-seanjc@google.com> Mime-Version: 1.0 References: <20210114003708.3798992-1-seanjc@google.com> X-Mailer: git-send-email 2.30.0.284.gd98b1dd5eaa7-goog Subject: [PATCH v2 06/14] x86/sev: Drop redundant and potentially misleading 'sev_enabled' From: Sean Christopherson To: Paolo Bonzini , Dave Hansen , Andy Lutomirski , Peter Zijlstra Cc: Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Borislav Petkov , Tom Lendacky , Brijesh Singh Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Drop the sev_enabled flag and switch its one user over to sev_active(). sev_enabled was made redundant with the introduction of sev_status in commit b57de6cd1639 ("x86/sev-es: Add SEV-ES Feature Detection"). sev_enabled and sev_active() are guaranteed to be equivalent, as each is true iff 'sev_status & MSR_AMD64_SEV_ENABLED' is true, and are only ever written in tandem (ignoring compressed boot's version of sev_status). Removing sev_enabled avoids confusion over whether it refers to the guest or the host, and will also allow KVM to usurp "sev_enabled" for its own purposes. No functional change intended. Signed-off-by: Sean Christopherson --- arch/x86/include/asm/mem_encrypt.h | 1 - arch/x86/mm/mem_encrypt.c | 12 +++++------- arch/x86/mm/mem_encrypt_identity.c | 1 - 3 files changed, 5 insertions(+), 9 deletions(-) diff --git a/arch/x86/include/asm/mem_encrypt.h b/arch/x86/include/asm/mem_encrypt.h index 2f62bbdd9d12..88d624499411 100644 --- a/arch/x86/include/asm/mem_encrypt.h +++ b/arch/x86/include/asm/mem_encrypt.h @@ -20,7 +20,6 @@ extern u64 sme_me_mask; extern u64 sev_status; -extern bool sev_enabled; void sme_encrypt_execute(unsigned long encrypted_kernel_vaddr, unsigned long decrypted_kernel_vaddr, diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c index bc0833713be9..b89bc03c63a2 100644 --- a/arch/x86/mm/mem_encrypt.c +++ b/arch/x86/mm/mem_encrypt.c @@ -44,8 +44,6 @@ EXPORT_SYMBOL(sme_me_mask); DEFINE_STATIC_KEY_FALSE(sev_enable_key); EXPORT_SYMBOL_GPL(sev_enable_key); -bool sev_enabled __section(".data"); - /* Buffer used for early in-place encryption by BSP, no locking needed */ static char sme_early_buffer[PAGE_SIZE] __initdata __aligned(PAGE_SIZE); @@ -342,16 +340,16 @@ int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size) * up under SME the trampoline area cannot be encrypted, whereas under SEV * the trampoline area must be encrypted. */ -bool sme_active(void) -{ - return sme_me_mask && !sev_enabled; -} - bool sev_active(void) { return sev_status & MSR_AMD64_SEV_ENABLED; } +bool sme_active(void) +{ + return sme_me_mask && !sev_active(); +} + /* Needs to be called from non-instrumentable code */ bool noinstr sev_es_active(void) { diff --git a/arch/x86/mm/mem_encrypt_identity.c b/arch/x86/mm/mem_encrypt_identity.c index 6c5eb6f3f14f..0c2759b7f03a 100644 --- a/arch/x86/mm/mem_encrypt_identity.c +++ b/arch/x86/mm/mem_encrypt_identity.c @@ -545,7 +545,6 @@ void __init sme_enable(struct boot_params *bp) /* SEV state cannot be controlled by a command line option */ sme_me_mask = me_mask; - sev_enabled = true; physical_mask &= ~sme_me_mask; return; } -- 2.30.0.284.gd98b1dd5eaa7-goog