initial Turin CPU platform

Author: iximeow

Cargo.lock

@@ -653,7 +653,7 @@ rand_distr = "0.5.1"
 rand_seeder = "0.4.0"
 range-requests = { path = "range-requests" }
 ratatui = "0.29.0"
-raw-cpuid = { git = "https://github.com/oxidecomputer/rust-cpuid.git", rev = "0a8dbd2311263f6a59ea58089e33c8331436ff3a" }
+raw-cpuid = { git = "https://github.com/oxidecomputer/rust-cpuid.git", rev = "8bdf76bfaa45bc30e944f8409d40f9edc7d62423" }
 rayon = "1.10"
 rcgen = "0.12.1"
 reconfigurator-cli = { path = "dev-tools/reconfigurator-cli" }

Cargo.toml

@@ -548,6 +548,70 @@ fn milan_ideal() -> CpuIdDump {
     dump
 }
 
+pub fn turin_v1() -> CpuIdDump {
+    // For VMs, a Turin-like CPU is very much like Milan with AVX-512 features,
+    // so start from Milan.
+    let baseline = milan_ideal();
+
+    let mut cpuid = CpuId::with_cpuid_reader(baseline);
+
+    let mut leaf = cpuid.get_extended_feature_info()
+        .expect("baseline Milan defines leaf 7");
+
+    // These are the AVX512 features present on a 9365, when I'd looked in
+    // September, anyway
+    leaf.set_avx512f(true);
+    leaf.set_avx512dq(true);
+    leaf.set_avx512_ifma(true);
+    leaf.set_avx512cd(true);
+    leaf.set_avx512bw(true);
+    leaf.set_avx512vl(true);
+
+    leaf.set_avx512vbmi(true);
+    leaf.set_avx512vbmi2(true);
+    leaf.set_gfni(true);
+    leaf.set_avx512vnni(true);
+    leaf.set_avx512bitalg(true);
+    leaf.set_avx512vpopcntdq(true);
+
+    leaf.set_avx512_bf16(true);
+    leaf.set_avx_vnni(true);
+
+    cpuid.set_extended_feature_info(Some(leaf))
+        .expect("can set leaf 7h");
+
+    let mut leaf = cpuid
+        .get_extended_processor_and_feature_identifiers()
+        .expect("baseline Milan defines leaf 8000_0001");
+    // RDTSCP requires some bhyve and Propolis work to support, so it is masked
+    // off for now.
+    leaf.set_rdtscp(false);
+    cpuid.set_extended_processor_and_feature_identifiers(Some(leaf))
+        .expect("can set leaf 8000_0001h");
+
+    cpuid
+        .set_processor_brand_string(Some(b"Oxide Virtual Turin-like Processor"))
+        .expect("can set vCPU brand string");
+
+    let mut leaf = cpuid
+        .get_processor_capacity_feature_info()
+        .expect("can get leaf 8000_0008h");
+
+    // Support for `wbnoinvd` is hidden in bhyve for the time being. This would
+    // probably be fine to pass through, but it is as-yet untested. Continue
+    // hiding this instruction.
+    leaf.set_wbnoinvd(false);
+
+    cpuid
+        .set_processor_capacity_feature_info(Some(leaf))
+        .expect("can set leaf 8000_0008h");
+
+    // Cache topology leaves are otherwise left zeroed; if we can avoid getting
+    // into it, let's try!
+
+    cpuid.into_source()
+}
+
 pub fn milan_rfd314() -> CpuIdDump {
     // This is the Milan we'd "want" to expose, absent any other constraints.
     let baseline = milan_ideal();

nexus/src/app/instance_platform/cpu_platform.rs

@@ -509,13 +509,18 @@ fn cpuid_from_vmm_cpu_platform(
 ) -> Option<Cpuid> {
     let cpuid = match platform {
         db::model::VmmCpuPlatform::SledDefault => return None,
-        db::model::VmmCpuPlatform::AmdMilan
-        | db::model::VmmCpuPlatform::AmdTurin => Cpuid {
+        db::model::VmmCpuPlatform::AmdMilan => Cpuid {
             entries: cpu_platform::dump_to_cpuid_entries(
                 cpu_platform::milan_rfd314(),
             ),
             vendor: CpuidVendor::Amd,
         },
+        db::model::VmmCpuPlatform::AmdTurin => Cpuid {
+            entries: cpu_platform::dump_to_cpuid_entries(
+                cpu_platform::turin_v1(),
+            ),
+            vendor: CpuidVendor::Amd,
+        },
     };
 
     Some(cpuid)