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[2620:137:e000::1:20]) by mx.google.com with ESMTP id l192-20020a6391c9000000b005347ef6ec11si1046875pge.760.2023.06.01.08.23.39; Thu, 01 Jun 2023 08:23:54 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20221208 header.b=mgzXD40B; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232380AbjFAPRX (ORCPT + 99 others); Thu, 1 Jun 2023 11:17:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56364 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234795AbjFAPQ5 (ORCPT ); Thu, 1 Jun 2023 11:16:57 -0400 Received: from mail-pf1-x430.google.com (mail-pf1-x430.google.com [IPv6:2607:f8b0:4864:20::430]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 48079193; Thu, 1 Jun 2023 08:16:38 -0700 (PDT) Received: by mail-pf1-x430.google.com with SMTP id d2e1a72fcca58-650352b89f6so430957b3a.0; Thu, 01 Jun 2023 08:16:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1685632598; x=1688224598; 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=ZJrY+3BKhCyIpt2KlCOdPmzAbDXEeG+dEF3DJAIJD+A=; b=mgzXD40Bg2V4kgffJ67CzHxGDOY9pG/fBT5qMoTNokDaKDv8ZDmMHRZhDon390clXA SRp3Ke6ZdJ3bwm+3h7DLWn49rxO+ZfdExetnVmWJKR1jqxtwMhXMAfn9sZGGauA81Jp1 mkyRrs/zCUP9FaisLYt+ARqVhaRW3y83quAuFr5G4vSnIAgfyG+S3IBc8OEqVsGr04Or eAQ5Cmojem9c7pkRe7u8XdPT9OlBPZc3k8bBkB9wEFdJLt55+OqHkqf1y7x/1oOBYAGq vyt3mhi2newu40VPgRBiXp3krcJ9RTmJfJzc5kcpyKYSdTPR89xuZkoOhRBzMGhmKn43 HO1g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1685632598; x=1688224598; 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=ZJrY+3BKhCyIpt2KlCOdPmzAbDXEeG+dEF3DJAIJD+A=; b=gbO6lMsKklvldrX++txST3ImaSH6ZdI5rPijupWDpIAhV3DQRnqNdSmLU67Yw00gBm p5sRzZ8lJOv6s3eDPXXsFmqnbUz1QfG+sqN3Z6II4pylT5KPGCJoVIcp2HrM9xOq4XUO kN3XEVFa+iv05pfofr2VjhsL8icPFMAFYiVrdOYmsZa8fPvkXaAWwGtPUMIOIzHkf6v4 bFyBO+VGV7SIiPkPNDzhCkdTH767tluwdb+DMTuwclgAW16Zvd/L0ynfjTGn0cmD7AAi Npu6RmtYI3c/u9Oyk3Cuen+A9Z1botW3MB1I9zYzE2Hfb4LPMflvVIiL5ZFVVpGfZTou NbrQ== X-Gm-Message-State: AC+VfDwQQg9PFDCqkM3Lvslm7KmD9SR4S+Wx1hE7LqUAFmoMROW67YWI e7LpJSI6VnT+/+t3xwoJL/c= X-Received: by 2002:a05:6a20:7fa7:b0:10f:8499:1b75 with SMTP id d39-20020a056a207fa700b0010f84991b75mr8243045pzj.9.1685632597910; Thu, 01 Jun 2023 08:16:37 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:9:e0c3:5ec1:4a35:2168]) by smtp.gmail.com with ESMTPSA id f3-20020a635543000000b0051b460fd90fsm3282639pgm.8.2023.06.01.08.16.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 01 Jun 2023 08:16:37 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, daniel.lezcano@linaro.org, arnd@arndb.de, michael.h.kelley@microsoft.com Cc: Tianyu Lan , linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, vkuznets@redhat.com Subject: [PATCH 8/9] x86/hyperv: Add smp support for SEV-SNP guest Date: Thu, 1 Jun 2023 11:16:21 -0400 Message-Id: <20230601151624.1757616-9-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230601151624.1757616-1-ltykernel@gmail.com> References: <20230601151624.1757616-1-ltykernel@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1767514345169258302?= X-GMAIL-MSGID: =?utf-8?q?1767514345169258302?= From: Tianyu Lan In the AMD SEV-SNP guest, AP needs to be started up via sev es save area and Hyper-V requires to call HVCALL_START_VP hypercall to pass the gpa of sev es save area with AP's vp index and VTL(Virtual trust level) parameters. Override wakeup_secondary_cpu_64 callback with hv_snp_boot_ap. Signed-off-by: Tianyu Lan --- arch/x86/hyperv/ivm.c | 95 +++++++++++++++++++++++++++++++ arch/x86/include/asm/mshyperv.h | 9 +++ arch/x86/kernel/cpu/mshyperv.c | 13 ++++- include/asm-generic/hyperv-tlfs.h | 1 + 4 files changed, 116 insertions(+), 2 deletions(-) diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c index e735507d0f54..238d73752dd8 100644 --- a/arch/x86/hyperv/ivm.c +++ b/arch/x86/hyperv/ivm.c @@ -22,11 +22,15 @@ #include #include #include +#include #ifdef CONFIG_AMD_MEM_ENCRYPT #define GHCB_USAGE_HYPERV_CALL 1 +static u8 ap_start_input_arg[PAGE_SIZE] __bss_decrypted __aligned(PAGE_SIZE); +static u8 ap_start_stack[PAGE_SIZE] __aligned(PAGE_SIZE); + union hv_ghcb { struct ghcb ghcb; struct { @@ -449,6 +453,97 @@ __init void hv_sev_init_mem_and_cpu(void) } } +#define hv_populate_vmcb_seg(seg, gdtr_base) \ +do { \ + if (seg.selector) { \ + seg.base = 0; \ + seg.limit = HV_AP_SEGMENT_LIMIT; \ + seg.attrib = *(u16 *)(gdtr_base + seg.selector + 5); \ + seg.attrib = (seg.attrib & 0xFF) | ((seg.attrib >> 4) & 0xF00); \ + } \ +} while (0) \ + +int hv_snp_boot_ap(int cpu, unsigned long start_ip) +{ + struct sev_es_save_area *vmsa = (struct sev_es_save_area *) + __get_free_page(GFP_KERNEL | __GFP_ZERO); + struct desc_ptr gdtr; + u64 ret, rmp_adjust, retry = 5; + struct hv_enable_vp_vtl *start_vp_input; + unsigned long flags; + + native_store_gdt(&gdtr); + + vmsa->gdtr.base = gdtr.address; + vmsa->gdtr.limit = gdtr.size; + + asm volatile("movl %%es, %%eax;" : "=a" (vmsa->es.selector)); + hv_populate_vmcb_seg(vmsa->es, vmsa->gdtr.base); + + asm volatile("movl %%cs, %%eax;" : "=a" (vmsa->cs.selector)); + hv_populate_vmcb_seg(vmsa->cs, vmsa->gdtr.base); + + asm volatile("movl %%ss, %%eax;" : "=a" (vmsa->ss.selector)); + hv_populate_vmcb_seg(vmsa->ss, vmsa->gdtr.base); + + asm volatile("movl %%ds, %%eax;" : "=a" (vmsa->ds.selector)); + hv_populate_vmcb_seg(vmsa->ds, vmsa->gdtr.base); + + vmsa->efer = native_read_msr(MSR_EFER); + + asm volatile("movq %%cr4, %%rax;" : "=a" (vmsa->cr4)); + asm volatile("movq %%cr3, %%rax;" : "=a" (vmsa->cr3)); + asm volatile("movq %%cr0, %%rax;" : "=a" (vmsa->cr0)); + + vmsa->xcr0 = 1; + vmsa->g_pat = HV_AP_INIT_GPAT_DEFAULT; + vmsa->rip = (u64)secondary_startup_64_no_verify; + vmsa->rsp = (u64)&ap_start_stack[PAGE_SIZE]; + + /* + * Set the SNP-specific fields for this VMSA: + * VMPL level + * SEV_FEATURES (matches the SEV STATUS MSR right shifted 2 bits) + */ + vmsa->vmpl = 0; + vmsa->sev_features = sev_status >> 2; + + /* + * Running at VMPL0 allows the kernel to change the VMSA bit for a page + * using the RMPADJUST instruction. However, for the instruction to + * succeed it must target the permissions of a lesser privileged + * (higher numbered) VMPL level, so use VMPL1 (refer to the RMPADJUST + * instruction in the AMD64 APM Volume 3). + */ + rmp_adjust = RMPADJUST_VMSA_PAGE_BIT | 1; + ret = rmpadjust((unsigned long)vmsa, RMP_PG_SIZE_4K, + rmp_adjust); + if (ret != 0) { + pr_err("RMPADJUST(%llx) failed: %llx\n", (u64)vmsa, ret); + return ret; + } + + local_irq_save(flags); + start_vp_input = + (struct hv_enable_vp_vtl *)ap_start_input_arg; + memset(start_vp_input, 0, sizeof(*start_vp_input)); + start_vp_input->partition_id = -1; + start_vp_input->vp_index = cpu; + start_vp_input->target_vtl.target_vtl = ms_hyperv.vtl; + *(u64 *)&start_vp_input->vp_context = __pa(vmsa) | 1; + + do { + ret = hv_do_hypercall(HVCALL_START_VP, + start_vp_input, NULL); + } while (hv_result(ret) == HV_STATUS_TIME_OUT && retry--); + + local_irq_restore(flags); + + if (!hv_result_success(ret)) + pr_err("HvCallStartVirtualProcessor failed: %llx\n", ret); + return ret; +} + void __init hv_vtom_init(void) { /* diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 7a9a6cdc2ae9..804c67475054 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -65,6 +65,13 @@ struct memory_map_entry { u32 reserved; }; +/* + * DEFAULT INIT GPAT and SEGMENT LIMIT value in struct VMSA + * to start AP in enlightened SEV guest. + */ +#define HV_AP_INIT_GPAT_DEFAULT 0x0007040600070406ULL +#define HV_AP_SEGMENT_LIMIT 0xffffffff + int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages); int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id); int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags); @@ -271,6 +278,7 @@ bool hv_ghcb_negotiate_protocol(void); void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason); void hv_vtom_init(void); void hv_sev_init_mem_and_cpu(void); +int hv_snp_boot_ap(int cpu, unsigned long start_ip); #else static inline void hv_ghcb_msr_write(u64 msr, u64 value) {} static inline void hv_ghcb_msr_read(u64 msr, u64 *value) {} @@ -278,6 +286,7 @@ static inline bool hv_ghcb_negotiate_protocol(void) { return false; } static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {} static inline void hv_vtom_init(void) {} static inline void hv_sev_init_mem_and_cpu(void) {} +static int hv_snp_boot_ap(int cpu, unsigned long start_ip) {} #endif extern bool hv_isolation_type_snp(void); diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 48b9eab3daf6..fd37f47de134 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -295,6 +295,16 @@ static void __init hv_smp_prepare_cpus(unsigned int max_cpus) native_smp_prepare_cpus(max_cpus); + /* + * Override wakeup_secondary_cpu_64 callback for SEV-SNP + * enlightened guest. + */ + if (hv_isolation_type_en_snp()) + apic->wakeup_secondary_cpu_64 = hv_snp_boot_ap; + + if (!hv_root_partition) + return; + #ifdef CONFIG_X86_64 for_each_present_cpu(i) { if (i == 0) @@ -501,8 +511,7 @@ static void __init ms_hyperv_init_platform(void) # ifdef CONFIG_SMP smp_ops.smp_prepare_boot_cpu = hv_smp_prepare_boot_cpu; - if (hv_root_partition) - smp_ops.smp_prepare_cpus = hv_smp_prepare_cpus; + smp_ops.smp_prepare_cpus = hv_smp_prepare_cpus; # endif /* diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h index f4e4cc4f965f..fdac4a1714ec 100644 --- a/include/asm-generic/hyperv-tlfs.h +++ b/include/asm-generic/hyperv-tlfs.h @@ -223,6 +223,7 @@ enum HV_GENERIC_SET_FORMAT { #define HV_STATUS_INVALID_PORT_ID 17 #define HV_STATUS_INVALID_CONNECTION_ID 18 #define HV_STATUS_INSUFFICIENT_BUFFERS 19 +#define HV_STATUS_TIME_OUT 120 #define HV_STATUS_VTL_ALREADY_ENABLED 134 /*