From patchwork Wed Nov 17 15:38:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandru Elisei X-Patchwork-Id: 12692946 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 53997C433F5 for ; Wed, 17 Nov 2021 15:45:34 +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 16DE4613A9 for ; Wed, 17 Nov 2021 15:45:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 16DE4613A9 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; 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:To:From:Reply-To:Cc:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ZquPjJBWB2l9bi6vutg1myoKXXl4BzrBHHkBzozHKIE=; b=CX6cO5WlaKuOy5 /G9iQjfwqus8WTG8Pm1Uss+xl0k+l5MNWQ+hhhyWEA/DqaJh7ZVyWdd0uxPngpJTewxQqPgP95KtS KltKRpoiVjugcVhppyjibYComRtD0YiCOx5D8wJDSaW12boNSVm27QtsPQaEfNctsW3qk90lakifi WO8nk3bTMuE5inbaypkKXAapNDU4GKYxHwUU0TeTrgQMDuPCw7W8HcRPMleI2JLz87DVNGBd6vFI0 dfRvbY8xXxh5hOxLOLw6hPjS2dhT3mRbmZ83cG7V/l/czcW/tqgqIpMqAoDY8dcKnSfcICsiYb17e YIrkf6I940l8n3ei4P6A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mnN6N-005TEF-0G; Wed, 17 Nov 2021 15:43:59 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mnN02-005Q3C-Ft for linux-arm-kernel@lists.infradead.org; Wed, 17 Nov 2021 15:37:28 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 0B0101FB; Wed, 17 Nov 2021 07:37:26 -0800 (PST) Received: from monolith.localdoman (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 9C1023F5A1; Wed, 17 Nov 2021 07:37:24 -0800 (PST) From: Alexandru Elisei To: maz@kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, will@kernel.org, mark.rutland@arm.com Subject: [RFC PATCH v5 14/38] KVM: arm64: Add SPE capability and VCPU feature Date: Wed, 17 Nov 2021 15:38:18 +0000 Message-Id: <20211117153842.302159-15-alexandru.elisei@arm.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211117153842.302159-1-alexandru.elisei@arm.com> References: <20211117153842.302159-1-alexandru.elisei@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211117_073726_645894_875992B1 X-CRM114-Status: GOOD ( 11.57 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add the KVM_CAP_ARM_SPE capability which allows userspace to discover if SPE emulation is available. Add the KVM_ARM_VCPU_SPE feature which enables the emulation for a VCPU. Both are disabled for now. Signed-off-by: Alexandru Elisei --- Documentation/virt/kvm/api.rst | 9 +++++++++ arch/arm64/include/uapi/asm/kvm.h | 1 + arch/arm64/kvm/arm.c | 3 +++ include/uapi/linux/kvm.h | 1 + 4 files changed, 14 insertions(+) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 5a69b3b543c0..acd2b97c9ca9 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -7544,3 +7544,12 @@ The argument to KVM_ENABLE_CAP is also a bitmask, and must be a subset of the result of KVM_CHECK_EXTENSION. KVM will forward to userspace the hypercalls whose corresponding bit is in the argument, and return ENOSYS for the others. + +8.35 KVM_CAP_ARM_SPE +-------------------- + +:Architectures: arm64 + +This capability indicates that Statistical Profiling Extension (SPE) emulation +is available in KVM. SPE emulation is enabled for each VCPU which has the +feature bit KVM_ARM_VCPU_SPE set. diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index b3edde68bc3e..9f0a8ea50ea9 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -106,6 +106,7 @@ struct kvm_regs { #define KVM_ARM_VCPU_SVE 4 /* enable SVE for this CPU */ #define KVM_ARM_VCPU_PTRAUTH_ADDRESS 5 /* VCPU uses address authentication */ #define KVM_ARM_VCPU_PTRAUTH_GENERIC 6 /* VCPU uses generic authentication */ +#define KVM_ARM_VCPU_SPE 7 /* enable SPE for this CPU */ struct kvm_vcpu_init { __u32 target; diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 27e86e480355..2cdb18d9a740 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -303,6 +303,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_ARM_LOCK_USER_MEMORY_REGION: r = 1; break; + case KVM_CAP_ARM_SPE: + r = 0; + break; default: r = 0; } diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 70c969967557..6f63b0f4017d 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1132,6 +1132,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_ARM_MTE 205 #define KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM 206 #define KVM_CAP_ARM_LOCK_USER_MEMORY_REGION 207 +#define KVM_CAP_ARM_SPE 208 #ifdef KVM_CAP_IRQ_ROUTING