From patchwork Thu Oct 10 08:36:37 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 11182961 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D327776 for ; Thu, 10 Oct 2019 08:51:57 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 B09A4218AC for ; Thu, 10 Oct 2019 08:51:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="Ka2M81Mr"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="OgV3+TdH" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B09A4218AC Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org 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=13tvKqOUCRAGwfmgfvIIjAhIK15tvy9FjNOpPiwdiZA=; b=Ka2M81MrU2zZMA zaJyikZSjeVBNSdGKi3AxexSEOoAJNNS3M28r6xDWyQ6ht5UYzMvCxsM9C3qHZWORLQZAlrpdzw+/ CLyW+5pb2Wbp6jv1azmbKYBZ/43mfllbtogiSRHyH1UrteUZ07ZOszFQVwt4ZBafsjxkC1lS4SKdn NXDsppX+FIZ/IOmLgnKJ4onwTEWTyMIfb7ixRNGJ7P68STaZJajDUj5mzQgsYrht73ccIBPNJiM3C jZ2bOfW+gAHzafRwTG7Nx6r/GsEoMAgMAVU5IyDevft+w96pfh0wLDOFv7SQX+9PZmkaYhwMRsXoV fQ0ChUDmubG/sR3QWzzw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1iIUAv-0000P4-6x; Thu, 10 Oct 2019 08:51:57 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.2 #3 (Red Hat Linux)) id 1iIU8e-00052U-95 for linux-arm-kernel@lists.infradead.org; Thu, 10 Oct 2019 08:49:38 +0000 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 55BA321D71; Thu, 10 Oct 2019 08:49:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570697375; bh=7DZ5PjMP7b5x4rM5b1G+HAZcSZk95Iof1H4TK11oOBA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OgV3+TdHf56LRix19LdyEVUQk9q3aArPackt6x2bHqIVoJhOhSJeYSWyhQj2iJTQN SCaw56zS7QtSVjCE4IVzXFTsJmOd3yVcCxQ0WKSv+aSDvhu7gdSN+2c8tqGXKoRedg k/+E/RzXfxKAA15fRHZouuPN6MEBni7PiwVqVuPg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 4.19 090/114] KVM: arm64: Set SCTLR_EL2.DSSBS if SSBD is forcefully disabled and !vhe Date: Thu, 10 Oct 2019 10:36:37 +0200 Message-Id: <20191010083612.834026878@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191010083544.711104709@linuxfoundation.org> References: <20191010083544.711104709@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191010_014936_364503_1B13627A X-CRM114-Status: GOOD ( 10.37 ) X-Spam-Score: -5.0 (-----) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-5.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [198.145.29.99 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ard Biesheuvel , Greg Kroah-Hartman , Will Deacon , Christoffer Dall , stable@vger.kernel.org, Catalin Marinas Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Will Deacon [ Upstream commit 7c36447ae5a090729e7b129f24705bb231a07e0b ] When running without VHE, it is necessary to set SCTLR_EL2.DSSBS if SSBD has been forcefully disabled on the kernel command-line. Acked-by: Christoffer Dall Signed-off-by: Will Deacon Signed-off-by: Catalin Marinas Signed-off-by: Ard Biesheuvel Signed-off-by: Greg Kroah-Hartman --- arch/arm64/include/asm/kvm_host.h | 11 +++++++++++ arch/arm64/kvm/hyp/sysreg-sr.c | 11 +++++++++++ 2 files changed, 22 insertions(+) --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -398,6 +398,8 @@ struct kvm_vcpu *kvm_mpidr_to_vcpu(struc DECLARE_PER_CPU(kvm_cpu_context_t, kvm_host_cpu_state); +void __kvm_enable_ssbs(void); + static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr, unsigned long hyp_stack_ptr, unsigned long vector_ptr) @@ -418,6 +420,15 @@ static inline void __cpu_init_hyp_mode(p */ BUG_ON(!static_branch_likely(&arm64_const_caps_ready)); __kvm_call_hyp((void *)pgd_ptr, hyp_stack_ptr, vector_ptr, tpidr_el2); + + /* + * Disabling SSBD on a non-VHE system requires us to enable SSBS + * at EL2. + */ + if (!has_vhe() && this_cpu_has_cap(ARM64_SSBS) && + arm64_get_ssbd_state() == ARM64_SSBD_FORCE_DISABLE) { + kvm_call_hyp(__kvm_enable_ssbs); + } } static inline bool kvm_arch_check_sve_has_vhe(void) --- a/arch/arm64/kvm/hyp/sysreg-sr.c +++ b/arch/arm64/kvm/hyp/sysreg-sr.c @@ -293,3 +293,14 @@ void kvm_vcpu_put_sysregs(struct kvm_vcp vcpu->arch.sysregs_loaded_on_cpu = false; } + +void __hyp_text __kvm_enable_ssbs(void) +{ + u64 tmp; + + asm volatile( + "mrs %0, sctlr_el2\n" + "orr %0, %0, %1\n" + "msr sctlr_el2, %0" + : "=&r" (tmp) : "L" (SCTLR_ELx_DSSBS)); +}