From patchwork Thu Dec 6 17:31:23 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 10716513 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AD0AD15A6 for ; Thu, 6 Dec 2018 17:33:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8DA282EF49 for ; Thu, 6 Dec 2018 17:33:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7C2A12EF4B; Thu, 6 Dec 2018 17:33:00 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 6B11B2EF49 for ; Thu, 6 Dec 2018 17:32:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=1TNyR0JWEyM6ZK7pM3v4DeaiVeffZrpIaTUbjmnaglw=; b=mnjClsbgBeni8f uhrOsoQdXsyA3k50aQbmbHmCV137li8IINVZXLbSQ68uVDMzi4ON3HGg/+nFOWs1B0MM/obNm5LCW CKwg7ve9JZoqTOGX8ZY+J7pqX3TIlIs50XQUKctiRwy4aBVdoOwRaKkxkdxFreXqF35+OPri6ImmH uw7DDGIQmjPOZHFE6DgKrK20nUHpZiEN65K6GRLdv1PNAXFChcHtU503e4g+B/LaXQoYCT73Mieuw rSpFJKx+1n/vPB1pv74QIDWKYP+YI1xwp57Ax/WBCkxatpysWgBXB6+yPF7BNS7P9+Dh9fbxz22Ix JiQglwhmCFYMby+7iK2A==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gUxWB-0001Iq-IN; Thu, 06 Dec 2018 17:32:55 +0000 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gUxVF-0000AO-MB for linux-arm-kernel@lists.infradead.org; Thu, 06 Dec 2018 17:32:06 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E52891650; Thu, 6 Dec 2018 09:31:44 -0800 (PST) Received: from filthy-habits.cambridge.arm.com (filthy-habits.cambridge.arm.com [10.1.196.62]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 486D43F5AF; Thu, 6 Dec 2018 09:31:43 -0800 (PST) From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Subject: [PATCH v3 5/8] arm64: KVM: Force VHE for systems affected by erratum 1165522 Date: Thu, 6 Dec 2018 17:31:23 +0000 Message-Id: <20181206173126.139877-6-marc.zyngier@arm.com> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20181206173126.139877-1-marc.zyngier@arm.com> References: <20181206173126.139877-1-marc.zyngier@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181206_093158_436293_A212C315 X-CRM114-Status: GOOD ( 15.72 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Suzuki K Poulose , Catalin Marinas , Will Deacon , Christoffer Dall , James Morse Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP In order to easily mitigate ARM erratum 1165522, we need to force affected CPUs to run in VHE mode if using KVM. Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/cpucaps.h | 3 ++- arch/arm64/include/asm/kvm_host.h | 4 ++++ arch/arm64/kernel/cpu_errata.c | 8 ++++++++ 3 files changed, 14 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h index 6e2d254c09eb..62d8cd15fdf2 100644 --- a/arch/arm64/include/asm/cpucaps.h +++ b/arch/arm64/include/asm/cpucaps.h @@ -54,7 +54,8 @@ #define ARM64_HAS_CRC32 33 #define ARM64_SSBS 34 #define ARM64_WORKAROUND_1188873 35 +#define ARM64_WORKAROUND_1165522 36 -#define ARM64_NCAPS 36 +#define ARM64_NCAPS 37 #endif /* __ASM_CPUCAPS_H */ diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index d6d9aa76a943..9217759afa6b 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -432,6 +432,10 @@ static inline bool kvm_arch_requires_vhe(void) if (system_supports_sve()) return true; + /* Some implementations have defects that confine them to VHE */ + if (cpus_have_cap(ARM64_WORKAROUND_1165522)) + return true; + return false; } diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index a509e35132d2..476e738e6c46 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -739,6 +739,14 @@ const struct arm64_cpu_capabilities arm64_errata[] = { .capability = ARM64_WORKAROUND_1188873, ERRATA_MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 2, 0), }, +#endif +#ifdef CONFIG_ARM64_ERRATUM_1165522 + { + /* Cortex-A76 r0p0 to r2p0 */ + .desc = "ARM erratum 1165522", + .capability = ARM64_WORKAROUND_1165522, + ERRATA_MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 2, 0), + }, #endif { }