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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 9ABE7C636CC for ; Tue, 31 Jan 2023 09:27:07 +0000 (UTC) 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: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=TlEgTAxXhjr1lGXFw3abz5T77Gp4p9467Z7cBgNd3n0=; b=QZKlpgD1poWwmi gXBarbXXTVCgOcmaG/p+zo1/Zo/xUsGHcRzEM4WkPCu6yIESA7Y2lTR0wRVn0i5dzUdtdTEmGWf5i lLlZ5y2R8AHqb3aeNu/XYTm2SOJlDqORUHW7qBcAtIkYK/iMtdcg9e+6WR0ekKlOl6ZupzmVcKb3A xFirBCKjek/h992RBrOB0ke1vQQv2Coc76jZUblWI/4bSNth6x893Rvz4mFkfIiZ2Uje4xXo5ANe5 vdczFfs8Z+ncAKVDVW1oukcVPO+VpjhmpLeagWzNxiPdEHHpdHIaK2bBtMcyQ6zFiXL7Zu0lA8Kcy GIHJ5ZfB2BXjNOclhvhA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pMmtw-006ydm-Ea; Tue, 31 Jan 2023 09:26:04 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pMmtS-006yP7-4b for linux-arm-kernel@lists.infradead.org; Tue, 31 Jan 2023 09:25:36 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 1582D6147A; Tue, 31 Jan 2023 09:25:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7A9D5C4339E; Tue, 31 Jan 2023 09:25:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1675157132; bh=caJCdIDxEcs2dm46yIwmQS+/hs5HuoKGvfg5KefJxGc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MXtonjIjLDsKqbhIJW/ynZWojNqOAs0Mcw4MauTh6Xg4UqtaR+FUR7DvWa1ZaSD5j ldBODNWUqLlEsF+n/dwH7wxmgZcqqnz5jR4zsLmbICBJ4EWT3HeQ3pyOmWjzmjo+PW m0n2z5IPCw9iy2Cza/tZxjj7MTpb8+AZmiaOm1BMKqoTjp6ptrIdC2w3KfML8ZQTX0 xpHfXyra6T1eiPrba899w37GixJ2lHRFGNmf4Bva+J3yFhimG5loyv5+R3vA+v9xRf qC5euF93xu24YRBCN3/YCiIG3nLctdRa5xF0RyTacYks8K2JG7whrDuPqmWj/qJViE 139bAk+jjca8Q== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1pMmtO-0067U2-Dq; Tue, 31 Jan 2023 09:25:30 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Alexandru Elisei , Andre Przywara , Chase Conklin , Christoffer Dall , Ganapatrao Kulkarni , Jintack Lim , Russell King , James Morse , Suzuki K Poulose , Oliver Upton , Zenghui Yu Subject: [PATCH v8 03/69] KVM: arm64: nv: Introduce nested virtualization VCPU feature Date: Tue, 31 Jan 2023 09:23:58 +0000 Message-Id: <20230131092504.2880505-4-maz@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230131092504.2880505-1-maz@kernel.org> References: <20230131092504.2880505-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, alexandru.elisei@arm.com, andre.przywara@arm.com, chase.conklin@arm.com, christoffer.dall@arm.com, gankulkarni@os.amperecomputing.com, jintack@cs.columbia.edu, rmk+kernel@armlinux.org.uk, james.morse@arm.com, suzuki.poulose@arm.com, oliver.upton@linux.dev, yuzenghui@huawei.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-20230131_012534_295991_D268EDC4 X-CRM114-Status: GOOD ( 17.88 ) 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: Christoffer Dall Introduce the feature bit and a primitive that checks if the feature is set behind a static key check based on the cpus_have_const_cap check. Checking vcpu_has_nv() on systems without nested virt enabled should have negligible overhead. We don't yet allow userspace to actually set this feature. Reviewed-by: Ganapatrao Kulkarni Reviewed-by: Russell King (Oracle) Signed-off-by: Christoffer Dall Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/kvm_nested.h | 14 ++++++++++++++ arch/arm64/include/uapi/asm/kvm.h | 1 + 2 files changed, 15 insertions(+) create mode 100644 arch/arm64/include/asm/kvm_nested.h diff --git a/arch/arm64/include/asm/kvm_nested.h b/arch/arm64/include/asm/kvm_nested.h new file mode 100644 index 000000000000..fd601ea68d13 --- /dev/null +++ b/arch/arm64/include/asm/kvm_nested.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ARM64_KVM_NESTED_H +#define __ARM64_KVM_NESTED_H + +#include + +static inline bool vcpu_has_nv(const struct kvm_vcpu *vcpu) +{ + return (!__is_defined(__KVM_NVHE_HYPERVISOR__) && + cpus_have_final_cap(ARM64_HAS_NESTED_VIRT) && + test_bit(KVM_ARM_VCPU_HAS_EL2, vcpu->arch.features)); +} + +#endif /* __ARM64_KVM_NESTED_H */ diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index a7a857f1784d..f8129c624b07 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -109,6 +109,7 @@ 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_HAS_EL2 7 /* Support nested virtualization */ struct kvm_vcpu_init { __u32 target; -- 2.34.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel