From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Martin 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> References: <1538141967-15375-1-git-send-email-Dave.Martin@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 500064A217 for ; Fri, 28 Sep 2018 09:40:32 -0400 (EDT) Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5yVbY8fJ-jmd for ; Fri, 28 Sep 2018 09:40:31 -0400 (EDT) Received: from foss.arm.com (foss.arm.com [217.140.101.70]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 29E1C49F94 for ; Fri, 28 Sep 2018 09:40:31 -0400 (EDT) In-Reply-To: <1538141967-15375-1-git-send-email-Dave.Martin@arm.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu To: kvmarm@lists.cs.columbia.edu Cc: Okamoto Takayuki , Christoffer Dall , Ard Biesheuvel , Marc Zyngier , Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org List-Id: kvmarm@lists.cs.columbia.edu 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 --- 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) -- 2.1.4