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 X-Spam-Level: X-Spam-Status: No, score=-15.7 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 5A75AC4361B for ; Tue, 13 Apr 2021 15:22:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 320C561249 for ; Tue, 13 Apr 2021 15:22:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346638AbhDMPXC (ORCPT ); Tue, 13 Apr 2021 11:23:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43012 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346590AbhDMPWz (ORCPT ); Tue, 13 Apr 2021 11:22:55 -0400 Received: from mail-pj1-x1032.google.com (mail-pj1-x1032.google.com [IPv6:2607:f8b0:4864:20::1032]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0B3F2C061756; Tue, 13 Apr 2021 08:22:35 -0700 (PDT) Received: by mail-pj1-x1032.google.com with SMTP id il9-20020a17090b1649b0290114bcb0d6c2so10885244pjb.0; Tue, 13 Apr 2021 08:22:35 -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=JrcobaZDDwC9TB1ZnbPW35j8Vme+SwTlWiFYuy59XcI87a/DvDQgx5pbrraPfhV/kU uV2sY9oBmeqq0R71Qj5gq/HQOowmpKwwvK3anuoL0oJydWOEIOajZN3KWoA3ZB5kHMSs HR1mzue6YbH5Jk1HhfeNFQ/zcfTQMoaiCxN2SVkYSskhRCdDn2O0t5O1VvA3HmmdlXQq 4PNFYGO8KNhLVmy6da90D0Q82K7H6kDjkH07ogundriqUFZHxMR/S8VyV8vhjU3P8nxH X24b18DXbVhuxM8W7iPMlU3ijzck9wnFV182D2NM9w0EIMiUTuU8GerB1r36MFoqCJad Kn8g== 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=WCx3F7o/NENh+MQzIm3wJpSSiLdjpuKlOkjT0bHEeluvxEOxcVJ+KVa0nsvmNPRnl7 xaDxsXuXNf1sqNEAkWvUAHaOv4dFRlfoJnFjMUIuHcVQs+WPhwr2Qh9Pl5DyIELHclEC mMhY5Aw0ngst3EnQV7JR8mhST30rjWBmVBY19zCYFwRL+wb2zcaDo/9kM6UZuHhabORW OUHpDEG7PZ0Z/Brg7yKBkUSXPUwNjqDb+hyvuueVer39G48dlonk3qnj9V4SN7zdSKj2 8+AFB00NLnczqd51TmR5C/OwGZRxrtfIveiaUuld4sIeqr+sxQVvv/Rnc20cXpQp2ylS WHKQ== X-Gm-Message-State: AOAM531q+/jCXe/WQ27SNBohbiQQG0rj2SYLz1f4xqvP+7TEmPm9s3nA xNLn3ZyG1vV1vEUpgq29M9E= X-Google-Smtp-Source: ABdhPJyhplndaR4BCEof1JxWUG16TVe7ZB4+7tqGiS85BUIgMxeHMO9r+DG0kEYpyhF8yic69dVBnw== X-Received: by 2002:a17:902:e8c1:b029:e9:3c98:2dd2 with SMTP id v1-20020a170902e8c1b02900e93c982dd2mr32763689plg.17.1618327354633; Tue, 13 Apr 2021 08:22:34 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:36:5b29:fe1a:45c9:c61c]) by smtp.gmail.com with ESMTPSA id y3sm12882026pfg.145.2021.04.13.08.22.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Apr 2021 08:22:34 -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 Cc: Tianyu Lan , linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, vkuznets@redhat.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, sunilmut@microsoft.com Subject: [RFC V2 PATCH 1/12] x86/HV: Initialize GHCB page in Isolation VM Date: Tue, 13 Apr 2021 11:22:06 -0400 Message-Id: <20210413152217.3386288-2-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210413152217.3386288-1-ltykernel@gmail.com> References: <20210413152217.3386288-1-ltykernel@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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; -- 2.25.1