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: pangupta@amd.com, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, linux-hyperv@vger.kernel.org,
linux-arch@vger.kernel.org
Subject: [RFC PATCH V5 03/15] x86/hyperv: Set Virtual Trust Level in VMBus init message
Date: Mon, 1 May 2023 04:57:13 -0400 [thread overview]
Message-ID: <20230501085726.544209-4-ltykernel@gmail.com> (raw)
In-Reply-To: <20230501085726.544209-1-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.
Set target vtl in the VMBus init message.
Signed-off-by: Tianyu Lan <tiala@microsoft.com>
---
Change since RFC v4:
* Use struct_size to calculate array size.
* Fix some coding style
Change since RFC v3:
* Use the standard helper functions to check hypercall result
* Fix coding style
Change since RFC v2:
* Rename get_current_vtl() to get_vtl()
* Fix some coding style issues
---
arch/x86/hyperv/hv_init.c | 36 ++++++++++++++++++++++++++++++
arch/x86/include/asm/hyperv-tlfs.h | 7 ++++++
drivers/hv/connection.c | 1 +
include/asm-generic/mshyperv.h | 1 +
include/linux/hyperv.h | 4 ++--
5 files changed, 47 insertions(+), 2 deletions(-)
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 9f3e2d71d015..331b855314b7 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -384,6 +384,40 @@ static void __init hv_get_partition_id(void)
local_irq_restore(flags);
}
+static u8 __init get_vtl(void)
+{
+ u64 control = HV_HYPERCALL_REP_COMP_1 | HVCALL_GET_VP_REGISTERS;
+ struct hv_get_vp_registers_input *input;
+ struct hv_get_vp_registers_output *output;
+ u64 vtl = 0;
+ u64 ret;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ input = *this_cpu_ptr(hyperv_pcpu_input_arg);
+ output = (struct hv_get_vp_registers_output *)input;
+ if (!input) {
+ local_irq_restore(flags);
+ goto done;
+ }
+
+ memset(input, 0, struct_size(input, element, 1));
+ input->header.partitionid = HV_PARTITION_ID_SELF;
+ input->header.vpindex = HV_VP_INDEX_SELF;
+ input->header.inputvtl = 0;
+ input->element[0].name0 = HV_X64_REGISTER_VSM_VP_STATUS;
+
+ ret = hv_do_hypercall(control, input, output);
+ if (hv_result_success(ret))
+ vtl = output->as64.low & HV_X64_VTL_MASK;
+ else
+ pr_err("Hyper-V: failed to get VTL! %lld", ret);
+ local_irq_restore(flags);
+
+done:
+ return vtl;
+}
+
/*
* This function is to be invoked early in the boot sequence after the
* hypervisor has been detected.
@@ -512,6 +546,8 @@ void __init hyperv_init(void)
/* Query the VMs extended capability once, so that it can be cached. */
hv_query_ext_cap(0);
+ /* Find the VTL */
+ ms_hyperv.vtl = get_vtl();
return;
clean_guest_os_id:
diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
index cea95dcd27c2..4bf0b315b0ce 100644
--- a/arch/x86/include/asm/hyperv-tlfs.h
+++ b/arch/x86/include/asm/hyperv-tlfs.h
@@ -301,6 +301,13 @@ enum hv_isolation_type {
#define HV_X64_MSR_TIME_REF_COUNT HV_REGISTER_TIME_REF_COUNT
#define HV_X64_MSR_REFERENCE_TSC HV_REGISTER_REFERENCE_TSC
+/*
+ * Registers are only accessible via HVCALL_GET_VP_REGISTERS hvcall and
+ * there is not associated MSR address.
+ */
+#define HV_X64_REGISTER_VSM_VP_STATUS 0x000D0003
+#define HV_X64_VTL_MASK GENMASK(3, 0)
+
/* Hyper-V memory host visibility */
enum hv_mem_host_visibility {
VMBUS_PAGE_NOT_VISIBLE = 0,
diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 5978e9dbc286..02b54f85dc60 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -98,6 +98,7 @@ int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, u32 version)
*/
if (version >= VERSION_WIN10_V5) {
msg->msg_sint = VMBUS_MESSAGE_SINT;
+ msg->msg_vtl = ms_hyperv.vtl;
vmbus_connection.msg_conn_id = VMBUS_MESSAGE_CONNECTION_ID_4;
} else {
msg->interrupt_page = virt_to_phys(vmbus_connection.int_page);
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index 402a8c1c202d..3052130ba4ef 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -48,6 +48,7 @@ struct ms_hyperv_info {
};
};
u64 shared_gpa_boundary;
+ u8 vtl;
};
extern struct ms_hyperv_info ms_hyperv;
extern bool hv_nested;
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index bfbc37ce223b..1f2bfec4abde 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -665,8 +665,8 @@ struct vmbus_channel_initiate_contact {
u64 interrupt_page;
struct {
u8 msg_sint;
- u8 padding1[3];
- u32 padding2;
+ u8 msg_vtl;
+ u8 reserved[6];
};
};
u64 monitor_page1;
--
2.25.1
next prev parent reply other threads:[~2023-05-01 8:57 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-01 8:57 [RFC PATCH V5 00/15] x86/hyperv/sev: Add AMD sev-snp enlightened guest support on hyperv Tianyu Lan
2023-05-01 8:57 ` [RFC PATCH V5 01/15] x86/hyperv: Add sev-snp enlightened guest static key Tianyu Lan
2023-05-01 8:57 ` [RFC PATCH V5 02/15] x86/hyperv: Decrypt hv vp assist page in sev-snp enlightened guest Tianyu Lan
2023-05-01 15:10 ` Tom Lendacky
2023-05-01 8:57 ` Tianyu Lan [this message]
2023-05-02 19:30 ` [RFC PATCH V5 03/15] x86/hyperv: Set Virtual Trust Level in VMBus init message Zhi Wang
2023-05-04 15:38 ` Tianyu Lan
2023-05-04 15:58 ` Zhi Wang
2023-05-01 8:57 ` [RFC PATCH V5 04/15] x86/hyperv: Use vmmcall to implement Hyper-V hypercall in sev-snp enlightened guest Tianyu Lan
2023-05-01 8:57 ` [RFC PATCH V5 05/15] clocksource/drivers/hyper-v: decrypt hyperv tsc page " Tianyu Lan
2023-05-04 16:54 ` Zhi Wang
2023-05-01 8:57 ` [RFC PATCH V5 06/15] hv: vmbus: decrypt VMBus pages for " Tianyu Lan
2023-05-01 8:57 ` [RFC PATCH V5 07/15] drivers: hv: Decrypt percpu hvcall input arg page in " Tianyu Lan
2023-05-01 8:57 ` [RFC PATCH V5 08/15] x86/hyperv: Initialize cpu and memory for " Tianyu Lan
2023-05-01 8:57 ` [RFC PATCH V5 09/15] x86/hyperv: Add smp support for sev-snp guest Tianyu Lan
2023-05-01 10:20 ` [EXTERNAL] " Saurabh Singh Sengar
2023-05-04 15:55 ` Tianyu Lan
2023-05-01 10:32 ` Saurabh Singh Sengar
2023-05-01 15:46 ` Tom Lendacky
2023-05-04 15:51 ` Tianyu Lan
2023-05-01 8:57 ` [RFC PATCH V5 10/15] x86/hyperv: Add hyperv-specific handling for VMMCALL under SEV-ES Tianyu Lan
2023-05-01 8:57 ` [RFC PATCH V5 11/15] x86/sev: Add a #HV exception handler Tianyu Lan
2023-05-05 10:59 ` Gupta, Pankaj
2023-05-11 13:25 ` Gupta, Pankaj
2023-05-01 8:57 ` [RFC PATCH V5 12/15] x86/sev: Add Check of #HV event in path Tianyu Lan
2023-05-01 8:57 ` [RFC PATCH V5 13/15] x86/sev: Add AMD sev-snp enlightened guest support on hyperv Tianyu Lan
2023-05-01 8:57 ` [RFC PATCH V5 14/15] x86/sev: optimize system vector processing invoked from #HV exception Tianyu Lan
2023-05-01 8:57 ` [RFC PATCH V5 15/15] x86/sev: Fix interrupt exit code paths " Tianyu Lan
2023-05-01 16:02 ` Tom Lendacky
2023-05-04 22:41 ` Tianyu Lan
2023-05-01 16:05 ` [RFC PATCH V5 00/15] x86/hyperv/sev: Add AMD sev-snp enlightened guest support on hyperv Tom Lendacky
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