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bh=ZHdN7biDTMCbZsH86bq9wEVAHh9Jk5WDAS/BJmNojPQ=; b=sVfHsa3o3FTXqskn9v9ITGXO3M5w6FQCGrPqIktf/M5qk1bhuMLlxHspzUfAJ9EthF tK7XHG4wvRfC2XfEUvz7H3JZ/23k7GupFJYbs7nhSLjkEMx24ElDNFs++FKLRT4iVy8C 0G82neDxSBdscGffl+YVYGH4xGSRKNQLMrLCMtCExaYilt6HZKLx8ip8IC4pxOvhA781 LzgD0AADHN9b6gBECI2l2LlA7TSzhT9guWdpnVzFGLMfmac4VkIAvFza6vMuyNZpzHNA +MjdE/vQuGm7OlcngHHXQF16P6538MZ/sXBz6oi/op+YoelwanuWz+7V1H1skeU1dDx8 7U8g== X-Gm-Message-State: ANoB5pmdrpIqD1lp0HLJ/SYNZsqftNTa0Cc7AiYrqNBOdO8FrSosP6Or bfSZeDEZoPgKs1MEC2rKbs6kPkQQjlnDsw== X-Received: by 2002:a63:5502:0:b0:470:3e8:6f25 with SMTP id j2-20020a635502000000b0047003e86f25mr9319719pgb.294.1668829605426; Fri, 18 Nov 2022 19:46:45 -0800 (PST) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:38:f087:1794:92c5:f8f0]) by smtp.gmail.com with ESMTPSA id e5-20020a056a0000c500b005360da6b26bsm3913892pfj.159.2022.11.18.19.46.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Nov 2022 19:46:44 -0800 (PST) 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: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-arch@vger.kernel.org Subject: [RFC PATCH V2 05/18] x86/hyperv: Get Virtual Trust Level via hvcall Date: Fri, 18 Nov 2022 22:46:19 -0500 Message-Id: <20221119034633.1728632-6-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221119034633.1728632-1-ltykernel@gmail.com> References: <20221119034633.1728632-1-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 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?1749894800954633009?= X-GMAIL-MSGID: =?utf-8?q?1749894800954633009?= From: Tianyu Lan sev-snp guest provides vtl(Virtual Trust Level) and get it from hyperv hvcall via HVCALL_GET_VP_REGISTERS. Signed-off-by: Tianyu Lan --- arch/x86/hyperv/hv_init.c | 35 ++++++++++++++++++++++++++++++++++ include/asm-generic/mshyperv.h | 2 ++ 2 files changed, 37 insertions(+) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 4600c5941957..5b919d4d24c0 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -390,6 +390,39 @@ static void __init hv_get_partition_id(void) local_irq_restore(flags); } +static u8 __init get_current_vtl(void) +{ + u64 control = ((u64)1 << HV_HYPERCALL_REP_COMP_OFFSET) | HVCALL_GET_VP_REGISTERS; + struct hv_get_vp_registers_input *input = NULL; + struct hv_get_vp_registers_output *output = NULL; + u8 vtl = 0; + int ret; + unsigned long flags; + + local_irq_save(flags); + input = *(struct hv_get_vp_registers_input **)this_cpu_ptr(hyperv_pcpu_input_arg); + output = (struct hv_get_vp_registers_output *)input; + if (!input || !output) { + pr_err("Hyper-V: cannot allocate a shared page!"); + goto done; + } + + memset(input, 0, sizeof(*input) + sizeof(input->element[0])); + input->header.partitionid = HV_PARTITION_ID_SELF; + input->header.inputvtl = 0; + input->element[0].name0 = 0x000D0003; + + ret = hv_do_hypercall(control, input, output); + if (ret == 0) + vtl = output->as64.low & 0xf; + else + pr_err("Hyper-V: failed to get the current VTL!"); + local_irq_restore(flags); + +done: + return vtl; +} + /* * This function is to be invoked early in the boot sequence after the * hypervisor has been detected. @@ -527,6 +560,8 @@ void __init hyperv_init(void) if (hv_is_isolation_supported()) swiotlb_update_mem_attributes(); #endif + /* Find the current VTL */ + ms_hyperv.vtl = get_current_vtl(); return; diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index bfb9eb9d7215..68133de044ec 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -46,6 +46,7 @@ struct ms_hyperv_info { }; }; u64 shared_gpa_boundary; + u8 vtl; }; extern struct ms_hyperv_info ms_hyperv; @@ -55,6 +56,7 @@ extern void * __percpu *hyperv_pcpu_output_arg; extern u64 hv_do_hypercall(u64 control, void *inputaddr, void *outputaddr); extern u64 hv_do_fast_hypercall8(u16 control, u64 input8); extern bool hv_isolation_type_snp(void); +extern bool hv_isolation_type_en_snp(void); /* Helper functions that provide a consistent pattern for checking Hyper-V hypercall status. */ static inline int hv_result(u64 status)