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 408E0C433F5 for ; Fri, 28 Jan 2022 12:23:00 +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=tYO6GE5w2874bkH9ovBwjataT2JZMDnTOgiitYBKYS0=; b=NHkMyvJhGpH+jB VqVtNr9WjobdRNljauoQz+MWTSGRkIJXvA2YPRXMNM0TWa1p46yIZTVHZ9mkx8g7a3RzNF6GkhZ32 a20b/bmqg5dP2LPQJ96wAcapdE+txCdGpiEHH0SXKpMqZGYEaJJcSvBTdQT/9CLaYfMnKeCW4qSvt 0dqMtCsuue1/13s0K7l4MZ8nA9OqB9puvbRcOAtv65PSXl7ssp+H3vsu5KrT8OB6oOJExBZQkp01R q7XikpcDcEZtKJGVI+BY162HUnjFqIRvgW/gnKyD2aR0qxl21Gbji8o5rsOz5KGtQwMcWg9zgNYb3 feKYts4d8DwpdZYj+tKA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nDQFk-001u5O-16; Fri, 28 Jan 2022 12:21:21 +0000 Received: from ams.source.kernel.org ([2604:1380:4601:e00::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nDQDx-001tNl-4Q for linux-arm-kernel@lists.infradead.org; Fri, 28 Jan 2022 12:19:31 +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 ams.source.kernel.org (Postfix) with ESMTPS id 9E3A2B82569; Fri, 28 Jan 2022 12:19:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 75CA6C340EB; Fri, 28 Jan 2022 12:19:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1643372366; bh=Jzt0hao+pMofidNUzSsvsIVFNGWinmEimzZT+rVNAWQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kjANOZHkcwXF+V/MdKe7TFgnxpxzFZemak7X6C2CvoIvuxYZpeY3Pk7Mj23CnEsdq +k3bZ8eLvsSP8Iyy7ysq3rKx5NaM6VKm4CeBm5r6IEGM1DpFjRgYBmySbktvuaa0tg 1JvlGrgi6caz9TmC59Z5mi4HyxZ3U3SHMMbOamD9fIUxszX3eMSotb8VtPfLgmLZX+ ojKj8j7KmF82wJ6+c6jBfwoAz8ZSjQcQKxq6KcFYIFDQqDMtfQ0uPTbg86/9F4BP/X 679byK+ukp0HzGk1FmNC2hePvvVf5BT3YGiS6hQxBzTHqe6Ki5IgPUGsDZfs6fiIDK DQmqWFmir+IGQ== Received: from sofa.misterjones.org ([185.219.108.64] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1nDQDs-003njR-H8; Fri, 28 Jan 2022 12:19:24 +0000 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Cc: Andre Przywara , Christoffer Dall , Jintack Lim , Haibo Xu , Ganapatrao Kulkarni , Chase Conklin , "Russell King (Oracle)" , James Morse , Suzuki K Poulose , Alexandru Elisei , karl.heubaum@oracle.com, mihai.carabas@oracle.com, miguel.luis@oracle.com, kernel-team@android.com Subject: [PATCH v6 02/64] KVM: arm64: nv: Introduce nested virtualization VCPU feature Date: Fri, 28 Jan 2022 12:18:10 +0000 Message-Id: <20220128121912.509006-3-maz@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220128121912.509006-1-maz@kernel.org> References: <20220128121912.509006-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, andre.przywara@arm.com, christoffer.dall@arm.com, jintack@cs.columbia.edu, haibo.xu@linaro.org, gankulkarni@os.amperecomputing.com, chase.conklin@arm.com, linux@armlinux.org.uk, james.morse@arm.com, suzuki.poulose@arm.com, alexandru.elisei@arm.com, karl.heubaum@oracle.com, mihai.carabas@oracle.com, miguel.luis@oracle.com, 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-20220128_041929_560508_307FEFBE X-CRM114-Status: GOOD ( 17.48 ) 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 b3edde68bc3e..395a4c039bcc 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_HAS_EL2 7 /* Support nested virtualization */ struct kvm_vcpu_init { __u32 target; -- 2.30.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel