From: Tianyu Lan <ltykernel@gmail.com>
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 [thread overview]
Message-ID: <20221119034633.1728632-6-ltykernel@gmail.com> (raw)
In-Reply-To: <20221119034633.1728632-1-ltykernel@gmail.com>
From: Tianyu Lan <tiala@microsoft.com>
sev-snp guest provides vtl(Virtual Trust Level) and get it from
hyperv hvcall via HVCALL_GET_VP_REGISTERS.
Signed-off-by: Tianyu Lan <tiala@microsoft.com>
---
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)
--
2.25.1
next prev parent reply other threads:[~2022-11-19 3:48 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-19 3:46 [RFC PATCH V2 00/18] x86/hyperv/sev: Add AMD sev-snp enlightened guest support on hyperv Tianyu Lan
2022-11-19 3:46 ` [RFC PATCH V2 01/18] x86/sev: Pvalidate memory gab for decompressing kernel Tianyu Lan
2022-11-29 12:56 ` Borislav Petkov
2022-11-29 14:42 ` Tianyu Lan
2022-11-29 15:22 ` Borislav Petkov
2022-12-28 19:15 ` Michael Kelley (LINUX)
2022-12-06 9:16 ` Gupta, Pankaj
2022-12-08 13:04 ` Tianyu Lan
2022-11-19 3:46 ` [RFC PATCH V2 02/18] x86/hyperv: Add sev-snp enlightened guest specific config Tianyu Lan
2022-12-12 17:56 ` Michael Kelley (LINUX)
2022-12-13 9:58 ` Tianyu Lan
2022-11-19 3:46 ` [RFC PATCH V2 03/18] x86/hyperv: apic change for sev-snp enlightened guest Tianyu Lan
2022-12-12 19:00 ` Michael Kelley (LINUX)
2022-11-19 3:46 ` [RFC PATCH V2 04/18] x86/hyperv: Decrypt hv vp assist page in " Tianyu Lan
2022-12-12 19:41 ` Michael Kelley (LINUX)
2022-12-13 15:21 ` Tianyu Lan
2022-11-19 3:46 ` Tianyu Lan [this message]
2022-12-12 23:41 ` [RFC PATCH V2 05/18] x86/hyperv: Get Virtual Trust Level via hvcall Michael Kelley (LINUX)
2022-11-19 3:46 ` [RFC PATCH V2 06/18] x86/hyperv: Use vmmcall to implement hvcall in sev-snp enlightened guest Tianyu Lan
2022-12-13 17:19 ` Michael Kelley (LINUX)
2022-12-14 16:02 ` Tianyu Lan
2023-01-09 7:24 ` Dexuan Cui
2022-11-19 3:46 ` [RFC PATCH V2 07/18] clocksource: hyper-v: decrypt hyperv tsc page " Tianyu Lan
2022-12-13 17:30 ` Michael Kelley (LINUX)
2022-12-14 16:05 ` Tianyu Lan
2022-11-19 3:46 ` [RFC PATCH V2 08/18] x86/hyperv: decrypt vmbus pages for " Tianyu Lan
2022-12-13 18:08 ` Michael Kelley (LINUX)
2022-12-26 4:19 ` Tianyu Lan
2022-11-19 3:46 ` [RFC PATCH V2 09/18] x86/hyperv: set target vtl in the vmbus init message Tianyu Lan
2022-12-14 18:12 ` Michael Kelley (LINUX)
2022-11-19 3:46 ` [RFC PATCH V2 10/18] drivers: hv: Decrypt percpu hvcall input arg page in sev-snp enlightened guest Tianyu Lan
2022-12-08 21:52 ` Dexuan Cui
2022-12-09 2:26 ` Tianyu Lan
2022-12-14 18:16 ` Michael Kelley (LINUX)
2022-12-26 7:26 ` Tianyu Lan
2022-11-19 3:46 ` [RFC PATCH V2 11/18] Drivers: hv: vmbus: Decrypt vmbus ring buffer Tianyu Lan
2022-12-14 18:25 ` Michael Kelley (LINUX)
2022-12-26 7:59 ` Tianyu Lan
2022-11-19 3:46 ` [RFC PATCH V2 12/18] x86/hyperv: Initialize cpu and memory for sev-snp enlightened guest Tianyu Lan
2022-12-28 17:07 ` Michael Kelley (LINUX)
2022-11-19 3:46 ` [RFC PATCH V2 13/18] x86/hyperv: Add smp support for sev-snp guest Tianyu Lan
2022-12-28 18:14 ` Michael Kelley (LINUX)
2022-11-19 3:46 ` [RFC PATCH V2 14/18] x86/hyperv: Add hyperv-specific hadling for VMMCALL under SEV-ES Tianyu Lan
2022-11-19 3:46 ` [RFC PATCH V2 15/18] x86/sev: Add a #HV exception handler Tianyu Lan
2023-01-10 12:47 ` Gupta, Pankaj
2023-01-10 13:43 ` Tianyu Lan
2023-01-12 7:43 ` Gupta, Pankaj
2022-11-19 3:46 ` [RFC PATCH V2 16/18] x86/sev: Initialize #HV doorbell and handle interrupt requests Tianyu Lan
2022-11-21 15:05 ` Kalra, Ashish
2022-11-22 13:46 ` Tianyu Lan
2022-11-22 19:17 ` Kalra, Ashish
2022-11-23 18:36 ` Tom Lendacky
2022-11-25 3:36 ` Tianyu Lan
2022-11-25 11:49 ` Christophe de Dinechin
2022-11-28 5:47 ` Tianyu Lan
2022-12-07 14:13 ` Gupta, Pankaj
2022-12-08 14:21 ` Tianyu Lan
2022-12-08 14:36 ` Gupta, Pankaj
2022-12-08 11:47 ` Gupta, Pankaj
2022-12-08 14:25 ` Tianyu Lan
2022-11-19 3:46 ` [RFC PATCH V2 17/18] x86/sev: optimize system vector processing invoked from #HV exception Tianyu Lan
2022-11-19 3:46 ` [RFC PATCH V2 18/18] x86/sev: Fix interrupt exit code paths " Tianyu Lan
2022-12-13 7:37 ` Gupta, Pankaj
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