From patchwork Sat Mar 18 11:56:34 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Borislav Petkov X-Patchwork-Id: 71588 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:604a:0:0:0:0:0 with SMTP id j10csp262402wrt; Sat, 18 Mar 2023 05:19:09 -0700 (PDT) X-Google-Smtp-Source: AK7set+qp9gfirlEnAScy1fZBNSbrFdV2BpX7LhJ/IAzlsQffnvatpjWBlyRMaC1BJzzP3fRz9NZ X-Received: by 2002:a05:6a20:8e1e:b0:cd:ed5c:4ec with SMTP id y30-20020a056a208e1e00b000cded5c04ecmr17626291pzj.3.1679141948920; Sat, 18 Mar 2023 05:19:08 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1679141948; cv=none; d=google.com; s=arc-20160816; b=nbnFcJAtcBrfXZfQI5n9s/HCzVPkFG5tNmgsunUVeLvq1USJcL3QnH2JCANyKtmvAN OIHmQmCYcA8BgtCn+gWLHgUOSGYTcQ9i3I8YzbMUmKlKfjLRoT05ZwwsH0QuYV2439PC 2XNWld0lg/nB9uwxwdw8ZWh6jGNaLuJYdtoTEPyO1jjiAX6U35v1gpYeIOz9Jwu1w+JF 0jdymr+KRY/OB/e8Ss5kFI5mDPx/Hd22o7MGnMWnQ6Kq9SUS7bPnMSzOzgYB/hoKFRl8 93qC82O5szPKstyQiDJrKhc1wu6HTG18VaihXml0EQbJPbNjUQ67+WRFyX03c2cVCS+U xdCg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=82g7Dmd0UABgWvJnfHsCsiNT2CdpiGkwWTIS0RC8fuU=; b=SjQiCKcIw0vo8hSimHo11WKLA2Wyv2CmKNBVY0Brt8bdhYHYRwhJgJbt08qrAxoISk itVx4Of66YCX+hzcULmtjge2PhKBMResHDTSb7XJc/RbFVLitQ9CBoB5r0ztX5deetJ/ HLVCxsICSyIhBhtM45SChCwdVmlmu+ri51rtniFGMQaVGXQyajy4eJyzTbxp35mZe1p7 /3SUNOJ89K50GujM/OiDAlPK9RV89enxyWqYBQVhStO8G1gJE5bius1cNDlhbc3zBJbx R5FPeYxKUn99Fyp1wiTwHOq5CiknYJRYzgBAU/26jCKC0zKt9YYznYfjVOzsujaGa9Q/ lINg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@alien8.de header.s=dkim header.b=OTXegHxN; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=alien8.de Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id t7-20020a632247000000b0050bd83dcd42si4950889pgm.370.2023.03.18.05.18.52; Sat, 18 Mar 2023 05:19:08 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@alien8.de header.s=dkim header.b=OTXegHxN; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=alien8.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229820AbjCRL4t (ORCPT + 99 others); Sat, 18 Mar 2023 07:56:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41178 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229772AbjCRL4o (ORCPT ); Sat, 18 Mar 2023 07:56:44 -0400 Received: from mail.skyhub.de (mail.skyhub.de [5.9.137.197]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DA1F748E0A for ; Sat, 18 Mar 2023 04:56:42 -0700 (PDT) Received: from zn.tnic (p5de8e687.dip0.t-ipconnect.de [93.232.230.135]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 591961EC0754; Sat, 18 Mar 2023 12:56:41 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1679140601; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=82g7Dmd0UABgWvJnfHsCsiNT2CdpiGkwWTIS0RC8fuU=; b=OTXegHxNDgtAmNZU/gkgcsDsQfTpnbSj0ZsNigwQ4aA97IN5i631IVEtsZS0VoX47veaot Zy2pOdVN6Ii7NwMGiINMYi1SIDs3ot8jA5CRAdXRZ45bRNWCW1FiQgJAwj4vmKgCXnkHKV p6SsLXTSCbOKEvZAU15yMz0Zu38RTz8= From: Borislav Petkov To: Joerg Roedel , Tom Lendacky Cc: X86 ML , LKML Subject: [PATCH 2/2] x86/sev: Get rid of special sev_es_enable_key Date: Sat, 18 Mar 2023 12:56:34 +0100 Message-Id: <20230318115634.9392-3-bp@alien8.de> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20230318115634.9392-1-bp@alien8.de> References: <20230318115634.9392-1-bp@alien8.de> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1760707947730042514?= X-GMAIL-MSGID: =?utf-8?q?1760707947730042514?= From: "Borislav Petkov (AMD)" A SEV-ES guest is active on AMD when CC_ATTR_GUEST_STATE_ENCRYPT is set. I.e., MSR_AMD64_SEV, bit 1, SEV_ES_Enabled. So no need for a special static key. No functional changes. Signed-off-by: Borislav Petkov (AMD) --- arch/x86/coco/core.c | 2 +- arch/x86/include/asm/sev.h | 11 +++++++---- arch/x86/kernel/sev.c | 5 ----- 3 files changed, 8 insertions(+), 10 deletions(-) diff --git a/arch/x86/coco/core.c b/arch/x86/coco/core.c index 684f0a910475..17f2b690a485 100644 --- a/arch/x86/coco/core.c +++ b/arch/x86/coco/core.c @@ -81,7 +81,7 @@ static bool hyperv_cc_platform_has(enum cc_attr attr) return attr == CC_ATTR_GUEST_MEM_ENCRYPT; } -bool cc_platform_has(enum cc_attr attr) +bool noinstr cc_platform_has(enum cc_attr attr) { switch (cc_vendor) { case CC_VENDOR_AMD: diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h index ebc271bb6d8e..1335781e4976 100644 --- a/arch/x86/include/asm/sev.h +++ b/arch/x86/include/asm/sev.h @@ -12,6 +12,7 @@ #include #include #include +#include #define GHCB_PROTOCOL_MIN 1ULL #define GHCB_PROTOCOL_MAX 2ULL @@ -134,24 +135,26 @@ struct snp_secrets_page_layout { } __packed; #ifdef CONFIG_AMD_MEM_ENCRYPT -extern struct static_key_false sev_es_enable_key; extern void __sev_es_ist_enter(struct pt_regs *regs); extern void __sev_es_ist_exit(void); static __always_inline void sev_es_ist_enter(struct pt_regs *regs) { - if (static_branch_unlikely(&sev_es_enable_key)) + if (cc_vendor == CC_VENDOR_AMD && + cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) __sev_es_ist_enter(regs); } static __always_inline void sev_es_ist_exit(void) { - if (static_branch_unlikely(&sev_es_enable_key)) + if (cc_vendor == CC_VENDOR_AMD && + cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) __sev_es_ist_exit(); } extern int sev_es_setup_ap_jump_table(struct real_mode_header *rmh); extern void __sev_es_nmi_complete(void); static __always_inline void sev_es_nmi_complete(void) { - if (static_branch_unlikely(&sev_es_enable_key)) + if (cc_vendor == CC_VENDOR_AMD && + cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) __sev_es_nmi_complete(); } extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd); diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index 679026a640ef..4fdba49b6e38 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -111,8 +111,6 @@ struct ghcb_state { }; static DEFINE_PER_CPU(struct sev_es_runtime_data*, runtime_data); -DEFINE_STATIC_KEY_FALSE(sev_es_enable_key); - static DEFINE_PER_CPU(struct sev_es_save_area *, sev_vmsa); struct sev_config { @@ -1393,9 +1391,6 @@ void __init sev_es_init_vc_handling(void) sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SNP_UNSUPPORTED); } - /* Enable SEV-ES special handling */ - static_branch_enable(&sev_es_enable_key); - /* Initialize per-cpu GHCB pages */ for_each_possible_cpu(cpu) { alloc_runtime_data(cpu);