From patchwork Fri Jun 19 13:01:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jianyong Wu X-Patchwork-Id: 11614151 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D411A14B7 for ; Fri, 19 Jun 2020 13:02:10 +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 614862080C for ; Fri, 19 Jun 2020 13:02:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="QPgGMdCu" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 614862080C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org 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=Zjk2FedFCPd52bXtBoQkZ5FSQLThuxq7cEhkgKRmJ4M=; b=QPgGMdCuhLA90BaK6J8xgPEBD0 jFu8H0fsblHAXB4d6uq6pfq4g0J3PsS/4+BMkJSNwgdmTUtCm1fRthb8EfME4P5CXVWxunCqSVQ27 5PsxnvxVK4fQ3sT9d+d3TIFBy/S1Eo1PJ4J3XgU+wEOZ7vzV7yIg25cxHUoWZTbscmMx3d2UNsBxh f+CX884WuYOasJhgZUrofbp6z34uZCOKDBrazmnRot/picKSXtmRdNDqpR3CKtVAzMITN7t9ib0pj CXsYOG/76QnuLUlzJN63ncFtspD9hryq3dt5sDK74gqhwTFmwrDNykO5cUQtb0Phkw1u8v8s3E7av mQugvjKw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jmGeh-0004WE-67; Fri, 19 Jun 2020 13:02:03 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jmGeR-0004Js-19 for linux-arm-kernel@lists.infradead.org; Fri, 19 Jun 2020 13:01:48 +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 6896E11B3; Fri, 19 Jun 2020 06:01:46 -0700 (PDT) Received: from entos-d05.shanghai.arm.com (entos-d05.shanghai.arm.com [10.169.40.35]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 39AF33F6CF; Fri, 19 Jun 2020 06:01:39 -0700 (PDT) From: Jianyong Wu To: netdev@vger.kernel.org, yangbo.lu@nxp.com, john.stultz@linaro.org, tglx@linutronix.de, pbonzini@redhat.com, sean.j.christopherson@intel.com, maz@kernel.org, richardcochran@gmail.com, Mark.Rutland@arm.com, will@kernel.org, suzuki.poulose@arm.com, steven.price@arm.com Subject: [PATCH v13 1/9] arm64: Probe for the presence of KVM hypervisor services during boot Date: Fri, 19 Jun 2020 21:01:12 +0800 Message-Id: <20200619130120.40556-2-jianyong.wu@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200619130120.40556-1-jianyong.wu@arm.com> References: <20200619130120.40556-1-jianyong.wu@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200619_060147_182732_6BE8CD02 X-CRM114-Status: GOOD ( 10.75 ) X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [217.140.110.172 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: justin.he@arm.com, Wei.Chen@arm.com, kvm@vger.kernel.org, Steve.Capper@arm.com, jianyong.wu@arm.com, linux-kernel@vger.kernel.org, Kaly.Xin@arm.com, nd@arm.com, kvmarm@lists.cs.columbia.edu, 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 From: Will Deacon Although the SMCCC specification provides some limited functionality for describing the presence of hypervisor and firmware services, this is generally applicable only to functions designated as "Arm Architecture Service Functions" and no portable discovery mechanism is provided for standard hypervisor services, despite having a designated range of function identifiers reserved by the specification. In an attempt to avoid the need for additional firmware changes every time a new function is added, introduce a UID to identify the service provider as being compatible with KVM. Once this has been established, additional services can be discovered via a feature bitmap. Cc: Marc Zyngier Signed-off-by: Will Deacon Signed-off-by: Jianyong Wu --- arch/arm64/include/asm/hypervisor.h | 11 +++++++++ arch/arm64/kernel/setup.c | 36 +++++++++++++++++++++++++++++ include/linux/arm-smccc.h | 26 +++++++++++++++++++++ 3 files changed, 73 insertions(+) diff --git a/arch/arm64/include/asm/hypervisor.h b/arch/arm64/include/asm/hypervisor.h index f9cc1d021791..91e4bd890819 100644 --- a/arch/arm64/include/asm/hypervisor.h +++ b/arch/arm64/include/asm/hypervisor.h @@ -2,6 +2,17 @@ #ifndef _ASM_ARM64_HYPERVISOR_H #define _ASM_ARM64_HYPERVISOR_H +#include #include +static inline bool kvm_arm_hyp_service_available(u32 func_id) +{ + extern DECLARE_BITMAP(__kvm_arm_hyp_services, ARM_SMCCC_KVM_NUM_FUNCS); + + if (func_id >= ARM_SMCCC_KVM_NUM_FUNCS) + return -EINVAL; + + return test_bit(func_id, __kvm_arm_hyp_services); +} + #endif diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index 93b3844cf442..92f8762a7b80 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -7,6 +7,7 @@ */ #include +#include #include #include #include @@ -276,6 +277,40 @@ arch_initcall(reserve_memblock_reserved_regions); u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID }; +DECLARE_BITMAP(__kvm_arm_hyp_services, ARM_SMCCC_KVM_NUM_FUNCS) = { }; + +static void __init kvm_init_hyp_services(void) +{ + int i; + struct arm_smccc_res res; + + if (arm_smccc_get_version() == ARM_SMCCC_VERSION_1_0) + return; + + arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID, &res); + if (res.a0 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 || + res.a1 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 || + res.a2 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 || + res.a3 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3) + return; + + memset(&res, 0, sizeof(res)); + arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID, &res); + for (i = 0; i < 32; ++i) { + if (res.a0 & (i)) + set_bit(i + (32 * 0), __kvm_arm_hyp_services); + if (res.a1 & (i)) + set_bit(i + (32 * 1), __kvm_arm_hyp_services); + if (res.a2 & (i)) + set_bit(i + (32 * 2), __kvm_arm_hyp_services); + if (res.a3 & (i)) + set_bit(i + (32 * 3), __kvm_arm_hyp_services); + } + + pr_info("KVM hypervisor services detected (0x%08lx 0x%08lx 0x%08lx 0x%08lx)\n", + res.a3, res.a2, res.a1, res.a0); +} + void __init setup_arch(char **cmdline_p) { init_mm.start_code = (unsigned long) _text; @@ -348,6 +383,7 @@ void __init setup_arch(char **cmdline_p) else psci_acpi_init(); + kvm_init_hyp_services(); init_bootcpu_ops(); smp_init_cpus(); smp_build_mpidr_hash(); diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h index 56d6a5c6e353..86ff30131e7b 100644 --- a/include/linux/arm-smccc.h +++ b/include/linux/arm-smccc.h @@ -49,11 +49,14 @@ #define ARM_SMCCC_OWNER_OEM 3 #define ARM_SMCCC_OWNER_STANDARD 4 #define ARM_SMCCC_OWNER_STANDARD_HYP 5 +#define ARM_SMCCC_OWNER_VENDOR_HYP 6 #define ARM_SMCCC_OWNER_TRUSTED_APP 48 #define ARM_SMCCC_OWNER_TRUSTED_APP_END 49 #define ARM_SMCCC_OWNER_TRUSTED_OS 50 #define ARM_SMCCC_OWNER_TRUSTED_OS_END 63 +#define ARM_SMCCC_FUNC_QUERY_CALL_UID 0xff01 + #define ARM_SMCCC_QUIRK_NONE 0 #define ARM_SMCCC_QUIRK_QCOM_A6 1 /* Save/restore register a6 */ @@ -81,6 +84,29 @@ ARM_SMCCC_SMC_32, \ 0, 0x7fff) +#define ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID \ + ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ + ARM_SMCCC_SMC_32, \ + ARM_SMCCC_OWNER_VENDOR_HYP, \ + ARM_SMCCC_FUNC_QUERY_CALL_UID) + +/* KVM UID value: 28b46fb6-2ec5-11e9-a9ca-4b564d003a74 */ +#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 0xb66fb428U +#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 0xe911c52eU +#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 0x564bcaa9U +#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3 0x743a004dU + +/* KVM "vendor specific" services */ +#define ARM_SMCCC_KVM_FUNC_FEATURES 0 +#define ARM_SMCCC_KVM_FUNC_FEATURES_2 127 +#define ARM_SMCCC_KVM_NUM_FUNCS 128 + +#define ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID \ + ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ + ARM_SMCCC_SMC_32, \ + ARM_SMCCC_OWNER_VENDOR_HYP, \ + ARM_SMCCC_KVM_FUNC_FEATURES) + #ifndef __ASSEMBLY__ #include