From patchwork Wed Apr 14 14:49:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tianyu Lan X-Patchwork-Id: 12203069 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8EB37C4360C for ; Wed, 14 Apr 2021 14:50:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 61479611B0 for ; Wed, 14 Apr 2021 14:50:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351962AbhDNOuw (ORCPT ); Wed, 14 Apr 2021 10:50:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38900 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232107AbhDNOus (ORCPT ); Wed, 14 Apr 2021 10:50:48 -0400 Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C81F7C06175F; Wed, 14 Apr 2021 07:50:25 -0700 (PDT) Received: by mail-pl1-x62a.google.com with SMTP id p16so6280186plf.12; Wed, 14 Apr 2021 07:50:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=OsFA5UjGBBz+WpI+wHtQ7Mb2J7cYrRLymhsyTS1f9mI=; b=dvEn7FiJ1SLom9xWKqMrGFlIo/UlMk3c6iQjeTXBfWODS9IhMJsyMTZ4T1MWyHKk/4 Ix8pR/zj8RdUuVlBI3ZAcfvK7Y1vkv8B0grJfNVMiycDAw1nN84wKIiCCHarKZnTpAAd yRsIqVkNTbfLqBTAPuU56Fk8Fjkp13hnLsMXR0yNyxBPTC3F5CL4ste7XhqNfOHBeRiH lRHYGYH7S/xtunirGgYHazOMlHl8Xt//vGYTB2KCLdGA8YGV4X4SWLPOTMNUNjHdh2L6 FHWlGTxK7iHLx+Wwh2HdefoSlQe/4ZwhjFfZyz6JAP50pp7EB0eC+OEONvK82+QyrEBc F3Yw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=OsFA5UjGBBz+WpI+wHtQ7Mb2J7cYrRLymhsyTS1f9mI=; b=REEBFLfp8c5/yU7luB6xFF0wfRdNc1cOs3gtSpZyPhvvFazLPukCz1UFoBaJxPQKut CwumnnGbVvXiyVcJ+GQjTZEHyprenTnz2v2k/BSM2Pj9HsthRq2azDUfxP7Jr9s8EHH4 QTBOIaiIm4GeHYKxlVKTibeV4q2qp8f3hDMi9Wbkhk65QVfEbXSwzueYsE9g6op3dOx6 LtzntidU8g9DCvqSgEHfUcLYhNfMrUtdW73LKWgq3seD4QPThrctwQ4ih7sTQ9nxJgj+ INfIKVuK8zn7vjaZCVIaPck57fa6ebamqmxjf1snTyKMeIKvPZ+RvxjdtMouXs1h09LO MMiA== X-Gm-Message-State: AOAM5327cDwfNYp1OVm1J5uq5DxanN/2zJzyoPQwH3HedFweRxj/GMNA yUqWgT1mYr1bDsf5clIkACc= X-Google-Smtp-Source: ABdhPJxOQSk6nZAoLefZfe857h19ZUVboJUlPFq4tkSU5Klpf/RhVEGVnYRpm3ZLMAu1mlXfBJ+M3Q== X-Received: by 2002:a17:902:e784:b029:e9:997a:6a27 with SMTP id cp4-20020a170902e784b02900e9997a6a27mr33074259plb.9.1618411825427; Wed, 14 Apr 2021 07:50:25 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:35:ebad:12c1:f579:e332]) by smtp.gmail.com with ESMTPSA id w67sm17732522pgb.87.2021.04.14.07.50.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Apr 2021 07:50:25 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, arnd@arndb.de, akpm@linux-foundation.org, gregkh@linuxfoundation.org, konrad.wilk@oracle.com, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com Cc: Tianyu Lan , iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, sunilmut@microsoft.com Subject: [Resend RFC PATCH V2 01/12] x86/HV: Initialize GHCB page in Isolation VM Date: Wed, 14 Apr 2021 10:49:34 -0400 Message-Id: <20210414144945.3460554-2-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210414144945.3460554-1-ltykernel@gmail.com> References: <20210414144945.3460554-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan Hyper-V exposes GHCB page via SEV ES GHCB MSR for SNP guest to communicate with hypervisor. Map GHCB page for all cpus to read/write MSR register and submit hvcall request via GHCB. Signed-off-by: Tianyu Lan --- arch/x86/hyperv/hv_init.c | 52 +++++++++++++++++++++++++++++++--- include/asm-generic/mshyperv.h | 1 + 2 files changed, 49 insertions(+), 4 deletions(-) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 0db5137d5b81..90e65fbf4c58 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -82,6 +82,9 @@ static int hv_cpu_init(unsigned int cpu) struct hv_vp_assist_page **hvp = &hv_vp_assist_page[smp_processor_id()]; void **input_arg; struct page *pg; + u64 ghcb_gpa; + void *ghcb_va; + void **ghcb_base; /* hv_cpu_init() can be called with IRQs disabled from hv_resume() */ pg = alloc_pages(irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL, hv_root_partition ? 1 : 0); @@ -128,6 +131,17 @@ static int hv_cpu_init(unsigned int cpu) wrmsrl(HV_X64_MSR_VP_ASSIST_PAGE, val); } + if (ms_hyperv.ghcb_base) { + rdmsrl(MSR_AMD64_SEV_ES_GHCB, ghcb_gpa); + + ghcb_va = ioremap_cache(ghcb_gpa, HV_HYP_PAGE_SIZE); + if (!ghcb_va) + return -ENOMEM; + + ghcb_base = (void **)this_cpu_ptr(ms_hyperv.ghcb_base); + *ghcb_base = ghcb_va; + } + return 0; } @@ -223,6 +237,7 @@ static int hv_cpu_die(unsigned int cpu) unsigned long flags; void **input_arg; void *pg; + void **ghcb_va = NULL; local_irq_save(flags); input_arg = (void **)this_cpu_ptr(hyperv_pcpu_input_arg); @@ -236,6 +251,13 @@ static int hv_cpu_die(unsigned int cpu) *output_arg = NULL; } + if (ms_hyperv.ghcb_base) { + ghcb_va = (void **)this_cpu_ptr(ms_hyperv.ghcb_base); + if (*ghcb_va) + iounmap(*ghcb_va); + *ghcb_va = NULL; + } + local_irq_restore(flags); free_pages((unsigned long)pg, hv_root_partition ? 1 : 0); @@ -372,6 +394,9 @@ void __init hyperv_init(void) u64 guest_id, required_msrs; union hv_x64_msr_hypercall_contents hypercall_msr; int cpuhp, i; + u64 ghcb_gpa; + void *ghcb_va; + void **ghcb_base; if (x86_hyper_type != X86_HYPER_MS_HYPERV) return; @@ -432,9 +457,24 @@ void __init hyperv_init(void) VMALLOC_END, GFP_KERNEL, PAGE_KERNEL_ROX, VM_FLUSH_RESET_PERMS, NUMA_NO_NODE, __builtin_return_address(0)); - if (hv_hypercall_pg == NULL) { - wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0); - goto remove_cpuhp_state; + if (hv_hypercall_pg == NULL) + goto clean_guest_os_id; + + if (hv_isolation_type_snp()) { + ms_hyperv.ghcb_base = alloc_percpu(void *); + if (!ms_hyperv.ghcb_base) + goto clean_guest_os_id; + + rdmsrl(MSR_AMD64_SEV_ES_GHCB, ghcb_gpa); + ghcb_va = ioremap_cache(ghcb_gpa, HV_HYP_PAGE_SIZE); + if (!ghcb_va) { + free_percpu(ms_hyperv.ghcb_base); + ms_hyperv.ghcb_base = NULL; + goto clean_guest_os_id; + } + + ghcb_base = (void **)this_cpu_ptr(ms_hyperv.ghcb_base); + *ghcb_base = ghcb_va; } rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); @@ -499,7 +539,8 @@ void __init hyperv_init(void) return; -remove_cpuhp_state: +clean_guest_os_id: + wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0); cpuhp_remove_state(cpuhp); free_vp_assist_page: kfree(hv_vp_assist_page); @@ -528,6 +569,9 @@ void hyperv_cleanup(void) */ hv_hypercall_pg = NULL; + if (ms_hyperv.ghcb_base) + free_percpu(ms_hyperv.ghcb_base); + /* Reset the hypercall page */ hypercall_msr.as_uint64 = 0; wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index dff58a3db5d5..c6f4c5c20fb8 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -35,6 +35,7 @@ struct ms_hyperv_info { u32 max_lp_index; u32 isolation_config_a; u32 isolation_config_b; + void __percpu **ghcb_base; }; extern struct ms_hyperv_info ms_hyperv;