From nobody Thu Dec 18 13:56:13 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 11E8CC7EE2E for ; Mon, 1 May 2023 08:57:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232149AbjEAI5n (ORCPT ); Mon, 1 May 2023 04:57:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52932 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232271AbjEAI5g (ORCPT ); Mon, 1 May 2023 04:57:36 -0400 Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A614DE77; Mon, 1 May 2023 01:57:34 -0700 (PDT) Received: by mail-pf1-x429.google.com with SMTP id d2e1a72fcca58-64115e652eeso25489117b3a.0; Mon, 01 May 2023 01:57:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1682931454; x=1685523454; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=6uYxV2dI/hb2rcrfooNSE6OrsK+/8Zb/z3h9orwCels=; b=C8uDAffQ6OHhqsfIO6Bq+5eTpKEILlK/GOpTu6rUfZvywEB76ytGf8lbazIOR7RQQm skQ5YvkOWDrA2OBKN1sODMUuPJTycrL1eGUHhcCQcIQ58UQFlRGh8MBIJWSLlmcRblmb 3rxU5Q6hzz8rdy/+deCqoi4vJgKDMLoOwEXcLcKDjcrAuBeeStzaOSZmWEeMRaOzqFpI /qHGtbbC0bC5ekIQeqa3xIgbJBnR4tj2hhMxmEsaDqtqE1cFcV/PylIU3GESvRe78xa0 +nyvIGwIcxAibNTg1Y6rloLSRyVgZ3UoFpmI6RVwrpVYFrL8dRuQCVuRp4Q9qH5FVdUl IX0g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682931454; x=1685523454; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=6uYxV2dI/hb2rcrfooNSE6OrsK+/8Zb/z3h9orwCels=; b=UkWfriVuEA1bgnZ7xhfAIA5b70XnLUmKTsiFRcGesetPk9m9jgGoxQqQ3zu3jYFSNY ezBT9cBg274jzmQpUeu2SyX4coCoSwveMay/qH8NHzKM1CMNAU5oAdhAWa0o5XTPnNiQ 85dzCllhfDdVBoazmMJGt4MyiuuaYHqI5fvxLZvOsqenNux8EvSsOp0xLsyt7kypoeAF oXaNZAAocF1FQ2xSy+EUHfP3PetNKZmIYV2yhlPm5lgqW5U7j7H2cIs3fwIpqjF8ApGb HxGUPwVIN9MPj4OHURBOSwEKPw0MXHB8HzhOKYkfpyUt0+zKr0q5MydynA20lejHJx1F GJfQ== X-Gm-Message-State: AC+VfDzmuWj6F2g6+4kjkoeOunoP7ZLmD9HktXhoCeRU0HuW62JZHj9H c18GWZRIElnSbE8kYTfOq5U= X-Google-Smtp-Source: ACHHUZ7cvb0mCeWDDY43OW9x5ugQOQdr9CWHyT9lhwZk2ZnwbZrVvHE4XgLdkwaIL+bl9uTCm+SsPg== X-Received: by 2002:a17:902:e550:b0:1a9:7dc2:9427 with SMTP id n16-20020a170902e55000b001a97dc29427mr21398307plf.21.1682931454093; Mon, 01 May 2023 01:57:34 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:b:e11b:15ea:ad44:bde7]) by smtp.gmail.com with ESMTPSA id t13-20020a1709028c8d00b001a4fe00a8d4sm17407070plo.90.2023.05.01.01.57.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 May 2023 01:57:33 -0700 (PDT) From: Tianyu Lan To: luto@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, seanjc@google.com, pbonzini@redhat.com, jgross@suse.com, tiala@microsoft.com, kirill@shutemov.name, jiangshan.ljs@antgroup.com, peterz@infradead.org, ashish.kalra@amd.com, srutherford@google.com, akpm@linux-foundation.org, anshuman.khandual@arm.com, pawan.kumar.gupta@linux.intel.com, adrian.hunter@intel.com, daniel.sneddon@linux.intel.com, alexander.shishkin@linux.intel.com, sandipan.das@amd.com, ray.huang@amd.com, brijesh.singh@amd.com, michael.roth@amd.com, thomas.lendacky@amd.com, venu.busireddy@oracle.com, sterritt@google.com, tony.luck@intel.com, samitolvanen@google.com, fenghua.yu@intel.com Cc: pangupta@amd.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-arch@vger.kernel.org Subject: [RFC PATCH V5 03/15] x86/hyperv: Set Virtual Trust Level in VMBus init message Date: Mon, 1 May 2023 04:57:13 -0400 Message-Id: <20230501085726.544209-4-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230501085726.544209-1-ltykernel@gmail.com> References: <20230501085726.544209-1-ltykernel@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Tianyu Lan sev-snp guest provides vtl(Virtual Trust Level) and get it from hyperv hvcall via HVCALL_GET_VP_REGISTERS. Set target vtl in the VMBus init message. Signed-off-by: Tianyu Lan --- Change since RFC v4: * Use struct_size to calculate array size. * Fix some coding style Change since RFC v3: * Use the standard helper functions to check hypercall result * Fix coding style Change since RFC v2: * Rename get_current_vtl() to get_vtl() * Fix some coding style issues --- arch/x86/hyperv/hv_init.c | 36 ++++++++++++++++++++++++++++++ arch/x86/include/asm/hyperv-tlfs.h | 7 ++++++ drivers/hv/connection.c | 1 + include/asm-generic/mshyperv.h | 1 + include/linux/hyperv.h | 4 ++-- 5 files changed, 47 insertions(+), 2 deletions(-) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 9f3e2d71d015..331b855314b7 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -384,6 +384,40 @@ static void __init hv_get_partition_id(void) local_irq_restore(flags); } =20 +static u8 __init get_vtl(void) +{ + u64 control =3D HV_HYPERCALL_REP_COMP_1 | HVCALL_GET_VP_REGISTERS; + struct hv_get_vp_registers_input *input; + struct hv_get_vp_registers_output *output; + u64 vtl =3D 0; + u64 ret; + unsigned long flags; + + local_irq_save(flags); + input =3D *this_cpu_ptr(hyperv_pcpu_input_arg); + output =3D (struct hv_get_vp_registers_output *)input; + if (!input) { + local_irq_restore(flags); + goto done; + } + + memset(input, 0, struct_size(input, element, 1)); + input->header.partitionid =3D HV_PARTITION_ID_SELF; + input->header.vpindex =3D HV_VP_INDEX_SELF; + input->header.inputvtl =3D 0; + input->element[0].name0 =3D HV_X64_REGISTER_VSM_VP_STATUS; + + ret =3D hv_do_hypercall(control, input, output); + if (hv_result_success(ret)) + vtl =3D output->as64.low & HV_X64_VTL_MASK; + else + pr_err("Hyper-V: failed to get VTL! %lld", ret); + local_irq_restore(flags); + +done: + return vtl; +} + /* * This function is to be invoked early in the boot sequence after the * hypervisor has been detected. @@ -512,6 +546,8 @@ void __init hyperv_init(void) /* Query the VMs extended capability once, so that it can be cached. */ hv_query_ext_cap(0); =20 + /* Find the VTL */ + ms_hyperv.vtl =3D get_vtl(); return; =20 clean_guest_os_id: diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hype= rv-tlfs.h index cea95dcd27c2..4bf0b315b0ce 100644 --- a/arch/x86/include/asm/hyperv-tlfs.h +++ b/arch/x86/include/asm/hyperv-tlfs.h @@ -301,6 +301,13 @@ enum hv_isolation_type { #define HV_X64_MSR_TIME_REF_COUNT HV_REGISTER_TIME_REF_COUNT #define HV_X64_MSR_REFERENCE_TSC HV_REGISTER_REFERENCE_TSC =20 +/* + * Registers are only accessible via HVCALL_GET_VP_REGISTERS hvcall and + * there is not associated MSR address. + */ +#define HV_X64_REGISTER_VSM_VP_STATUS 0x000D0003 +#define HV_X64_VTL_MASK GENMASK(3, 0) + /* Hyper-V memory host visibility */ enum hv_mem_host_visibility { VMBUS_PAGE_NOT_VISIBLE =3D 0, diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c index 5978e9dbc286..02b54f85dc60 100644 --- a/drivers/hv/connection.c +++ b/drivers/hv/connection.c @@ -98,6 +98,7 @@ int vmbus_negotiate_version(struct vmbus_channel_msginfo = *msginfo, u32 version) */ if (version >=3D VERSION_WIN10_V5) { msg->msg_sint =3D VMBUS_MESSAGE_SINT; + msg->msg_vtl =3D ms_hyperv.vtl; vmbus_connection.msg_conn_id =3D VMBUS_MESSAGE_CONNECTION_ID_4; } else { msg->interrupt_page =3D virt_to_phys(vmbus_connection.int_page); diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index 402a8c1c202d..3052130ba4ef 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -48,6 +48,7 @@ struct ms_hyperv_info { }; }; u64 shared_gpa_boundary; + u8 vtl; }; extern struct ms_hyperv_info ms_hyperv; extern bool hv_nested; diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index bfbc37ce223b..1f2bfec4abde 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -665,8 +665,8 @@ struct vmbus_channel_initiate_contact { u64 interrupt_page; struct { u8 msg_sint; - u8 padding1[3]; - u32 padding2; + u8 msg_vtl; + u8 reserved[6]; }; }; u64 monitor_page1; --=20 2.25.1