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=-17.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 AC752C433DB for ; Tue, 16 Mar 2021 10:24:54 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 3068065024 for ; Tue, 16 Mar 2021 10:24:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3068065024 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=dZSyWz9K9ID5x6A8oclsDxgvHeW7az+l0aTqBiBWCio=; b=bpKMbApPT23lQdiARHmnBbLBx jWu8lY4likCnAniwthQ63gA8GthBPuW4Ea8PXOgPcIFLJFFnd7yhY9SpGo+YyxVDwAWrdmxIIf8eN gp4RFrnj68udmdpXjaH48d9Aev1mc95jPnvMzIYaC/V0x4tDJBjl948b/wOyi7ovexunjufTeUMoe KXqiA2XEWsh3TuwlcWWHwPPd66QG9zMipvD7Gbb17lqO9K/ptm7LXqIwQGvYxlfpVbcCRCpPP58lZ 259cS3baGCjPQEjnuzxEyU6PM7Hn7obIUOZti3zVzlucKk/Lvn373x4N2kSxPA2OofATziEYBMr6j CAUOKc01w==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lM6rY-000PRI-8m; Tue, 16 Mar 2021 10:23:44 +0000 Received: from mail.kernel.org ([198.145.29.99]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lM6rT-000PQd-N5 for linux-arm-kernel@lists.infradead.org; Tue, 16 Mar 2021 10:23:41 +0000 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (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 1D41B64FC7; Tue, 16 Mar 2021 10:23:38 +0000 (UTC) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1lM6hj-001uep-Kt; Tue, 16 Mar 2021 10:13:35 +0000 From: Marc Zyngier To: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org Cc: dave.martin@arm.com, daniel.kiss@arm.com, Will Deacon , Catalin Marinas , James Morse , Julien Thierry , Suzuki K Poulose , broonie@kernel.org, kernel-team@android.com Subject: [PATCH 10/10] KVM: arm64: Enable SVE support for nVHE Date: Tue, 16 Mar 2021 10:13:12 +0000 Message-Id: <20210316101312.102925-11-maz@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210316101312.102925-1-maz@kernel.org> References: <20210316101312.102925-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, dave.martin@arm.com, daniel.kiss@arm.com, will@kernel.org, catalin.marinas@arm.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, broonie@kernel.org, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210316_102340_150940_1FD9ED77 X-CRM114-Status: GOOD ( 18.07 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Daniel Kiss Now that KVM is equipped to deal with SVE on nVHE, remove the code preventing it from being used as well as the bits of documentation that were mentioning the incompatibility. Signed-off-by: Daniel Kiss Signed-off-by: Marc Zyngier --- arch/arm64/Kconfig | 7 ------- arch/arm64/include/asm/kvm_host.h | 13 ------------- arch/arm64/kvm/arm.c | 5 ----- arch/arm64/kvm/reset.c | 4 ---- 4 files changed, 29 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 1f212b47a48a..2690543799fb 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1686,7 +1686,6 @@ endmenu config ARM64_SVE bool "ARM Scalable Vector Extension support" default y - depends on !KVM || ARM64_VHE help The Scalable Vector Extension (SVE) is an extension to the AArch64 execution state which complements and extends the SIMD functionality @@ -1715,12 +1714,6 @@ config ARM64_SVE booting the kernel. If unsure and you are not observing these symptoms, you should assume that it is safe to say Y. - CPUs that support SVE are architecturally required to support the - Virtualization Host Extensions (VHE), so the kernel makes no - provision for supporting SVE alongside KVM without VHE enabled. - Thus, you will need to enable CONFIG_ARM64_VHE if you want to support - KVM in the same kernel image. - config ARM64_MODULE_PLTS bool "Use PLTs to allow module memory to spill over into vmalloc area" depends on MODULES diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 9108ccc80653..62a5f14dde36 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -696,19 +696,6 @@ static inline void kvm_init_host_cpu_context(struct kvm_cpu_context *cpu_ctxt) ctxt_sys_reg(cpu_ctxt, MPIDR_EL1) = read_cpuid_mpidr(); } -static inline bool kvm_arch_requires_vhe(void) -{ - /* - * The Arm architecture specifies that implementation of SVE - * requires VHE also to be implemented. The KVM code for arm64 - * relies on this when SVE is present: - */ - if (system_supports_sve()) - return true; - - return false; -} - void kvm_arm_vcpu_ptrauth_trap(struct kvm_vcpu *vcpu); static inline void kvm_arch_hardware_unsetup(void) {} diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index fc4c95dd2d26..ef92b7d32ebd 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -1889,11 +1889,6 @@ int kvm_arch_init(void *opaque) in_hyp_mode = is_kernel_in_hyp_mode(); - if (!in_hyp_mode && kvm_arch_requires_vhe()) { - kvm_pr_unimpl("CPU unsupported in non-VHE mode, not initializing\n"); - return -ENODEV; - } - if (cpus_have_final_cap(ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) || cpus_have_final_cap(ARM64_WORKAROUND_1508412)) kvm_info("Guests without required CPU erratum workarounds can deadlock system!\n" \ diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c index 47f3f035f3ea..f08b1e7ebf68 100644 --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -74,10 +74,6 @@ static int kvm_vcpu_enable_sve(struct kvm_vcpu *vcpu) if (!system_supports_sve()) return -EINVAL; - /* Verify that KVM startup enforced this when SVE was detected: */ - if (WARN_ON(!has_vhe())) - return -EINVAL; - vcpu->arch.sve_max_vl = kvm_sve_max_vl; /* -- 2.29.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel