From patchwork Fri Sep 28 13:39:12 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Dave Martin X-Patchwork-Id: 10619965 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 33CBE6CB for ; Fri, 28 Sep 2018 13:46:15 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 22F2C28938 for ; Fri, 28 Sep 2018 13:46:15 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1520C289C5; Fri, 28 Sep 2018 13:46:15 +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=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE 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 AAC2C28938 for ; Fri, 28 Sep 2018 13:46:14 +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:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: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=gyY+iULEePKoSyLalFeSKNaLuZ2oiNTOkfYJ4sZz9sc=; b=TeeGqEwlczwR+h6iL4LdyugOJ5 /rkwVyikCuTEwNYyeCR4WASGeCGR6j6cQeP5eGi178Z6qPijdhcVCAIFMoBTdt29EC3pNDro4+nyK OcPlCthhmpl6TQRNvT3ttX/ctD2bZ7Xik/9OJt9Krnsa6tyPHIei9QvCbcsKUOq0vP8biqghyy7HR 7aluK3hKY4qEo/Exn39dFgVI/clL8rNHzYqPbeBCm8ucAO153ZQvSjQBBmfLfM2VkIlxdofUg3b0r +i2DiIhOiKQDvPKcPW6nEAPbUzeQI0A81mGB5kXtKbgTjAGzlTRDMwqiFWGVBvkIL8KT23/h7ohqa uF4PzGfA==; 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 1g5t5m-0002sF-Iw; Fri, 28 Sep 2018 13:46:02 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1g5t0f-0007p6-8n for linux-arm-kernel@lists.infradead.org; Fri, 28 Sep 2018 13:42:32 +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 DD8781BC0; Fri, 28 Sep 2018 06:40:30 -0700 (PDT) Received: from e103592.Emea.Arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 0D3283F5B7; Fri, 28 Sep 2018 06:40:28 -0700 (PDT) From: Dave Martin To: kvmarm@lists.cs.columbia.edu Subject: [RFC PATCH v2 08/23] KVM: arm64: Add a vcpu flag to control SVE visibility for the guest Date: Fri, 28 Sep 2018 14:39:12 +0100 Message-Id: <1538141967-15375-9-git-send-email-Dave.Martin@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1538141967-15375-1-git-send-email-Dave.Martin@arm.com> References: <1538141967-15375-1-git-send-email-Dave.Martin@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180928_064045_422828_BD239F70 X-CRM114-Status: GOOD ( 11.65 ) 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: Peter Maydell , Okamoto Takayuki , Christoffer Dall , Ard Biesheuvel , Marc Zyngier , Catalin Marinas , Will Deacon , =?utf-8?q?Alex_Benn=C3=A9e?= , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 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 Since SVE will be enabled or disabled on a per-vcpu basis, a flag is needed in order to track which vcpus have it enabled. This patch adds a suitable flag and a helper for checking it. Signed-off-by: Dave Martin Reviewed-by: Alex Bennée --- Changes since RFCv1: * Convert vcpu_has_sve() to a macro so that it can operate on a vcpu without circular header dependency problems. This avoids the helper requiring a vcpu_arch argument, which was a little ugly. --- arch/arm64/include/asm/kvm_host.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index d4b65414..20baf4a 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -307,6 +307,10 @@ struct kvm_vcpu_arch { #define KVM_ARM64_FP_HOST (1 << 2) /* host FP regs loaded */ #define KVM_ARM64_HOST_SVE_IN_USE (1 << 3) /* backup for host TIF_SVE */ #define KVM_ARM64_HOST_SVE_ENABLED (1 << 4) /* SVE enabled for EL0 */ +#define KVM_ARM64_GUEST_HAS_SVE (1 << 5) /* SVE exposed to guest */ + +#define vcpu_has_sve(vcpu) (system_supports_sve() && \ + ((vcpu)->arch.flags & KVM_ARM64_GUEST_HAS_SVE)) #define vcpu_gp_regs(v) (&(v)->arch.ctxt.gp_regs)