runtime-rs: Port MSFT changes from msft-main in runtime-go

src/libs/kata-types/src/config/default.rs

@@ -54,7 +54,7 @@ pub const MAX_SHARED_9PFS_SIZE_MB: u32 = 8 * 1024 * 1024;
 pub const DEFAULT_GUEST_HOOK_PATH: &str = "/opt/kata/hooks";
 pub const DEFAULT_GUEST_DNS_FILE: &str = "/etc/resolv.conf";
 
-pub const DEFAULT_GUEST_VCPUS: u32 = 1;
+pub const DEFAULT_GUEST_VCPUS: u32 = 0;
 
 // Default configuration for dragonball
 pub const DEFAULT_DRAGONBALL_GUEST_KERNEL_IMAGE: &str = "vmlinuz";
@@ -93,7 +93,7 @@ pub const DEFAULT_CH_MEMORY_SLOTS: u32 = 128;
 pub const DEFAULT_CH_PCI_BRIDGES: u32 = 2;
 pub const MAX_CH_PCI_BRIDGES: u32 = 5;
 pub const MAX_CH_VCPUS: u32 = 256;
-pub const MIN_CH_MEMORY_SIZE_MB: u32 = 64;
+pub const MIN_CH_MEMORY_SIZE_MB: u32 = 0;
 
 //Default configuration for firecracker
 pub const DEFAULT_FIRECRACKER_ENTROPY_SOURCE: &str = "/dev/urandom";

src/libs/kata-types/src/config/hypervisor/ch.rs

@@ -129,12 +129,6 @@ impl ConfigPlugin for CloudHypervisorConfig {
                     ch.device_info.default_bridges,
                 )));
             }
-
-            if ch.memory_info.default_memory < MIN_CH_MEMORY_SIZE_MB {
-                return Err(std::io::Error::other(format!(
-                    "CH hypervisor has minimal memory limitation {MIN_CH_MEMORY_SIZE_MB}",
-                )));
-            }
         }
 
         Ok(())

src/libs/kata-types/src/config/hypervisor/mod.rs

@@ -1031,19 +1031,14 @@ impl MemoryInfo {
 
     /// Validates the memory configuration information.
     ///
-    /// This ensures that critical memory parameters like `default_memory`
-    /// and `memory_slots` are non-zero, and checks the validity of
+    /// This ensures that critical memory parameters like `memory_slots` are
+    /// non-zero, and checks the validity of
     /// the memory backend file path.
     pub fn validate(&self) -> Result<()> {
         validate_path!(
             self.file_mem_backend,
             "Memory backend file {} is invalid: {}"
         )?;
-        if self.default_memory == 0 {
-            return Err(std::io::Error::other(
-                "Configured memory size for guest VM is zero",
-            ));
-        }
         if self.memory_slots == 0 {
             return Err(std::io::Error::other(
                 "Configured memory slots for guest VM are zero",

src/libs/kata-types/src/config/runtime.rs

@@ -123,6 +123,21 @@ pub struct Runtime {
     #[serde(default)]
     pub static_sandbox_resource_mgmt: bool,
 
+    /// Memory to allocate for workloads within the sandbox when workload memory is unspecified
+    #[serde(default)]
+    pub static_sandbox_default_workload_mem: u32,
+
+    /// Default workload vcpus added to the sandbox when static resource management
+    /// is enabled and no explicit workload vcpu limit was provided.
+    #[serde(default)]
+    pub static_sandbox_default_workload_vcpus: f32,
+
+    /// Minimum memory (in MiB) to enforce for pods that explicitly set a memory limit via
+    /// resources.limits.memory. If the requested memory is below this value the sandbox
+    /// creation will fail with a descriptive error. 0 (the default) disables the check.
+    #[serde(default)]
+    pub sandbox_workload_mem_min: u32,
+
     /// Determines whether container seccomp profiles are passed to the virtual machine and
     /// applied by the kata agent. If set to true, seccomp is not applied within the guest.
     #[serde(default)]

src/runtime-rs/Makefile

@@ -159,11 +159,11 @@ FIRMWARE_SNP_PATH := $(PREFIXDEPS)/share/ovmf/AMDSEV.fd
 FIRMWARE_VOLUME_SNP_PATH :=
 
 ##VAR DEFVCPUS=<number> Default number of vCPUs
-DEFVCPUS := 1
+DEFVCPUS ?= 1
 ##VAR DEFMAXVCPUS=<number> Default maximum number of vCPUs
 DEFMAXVCPUS := 0
 ##VAR DEFMEMSZ=<number> Default memory size in MiB
-DEFMEMSZ := 2048
+DEFMEMSZ ?= 2048
 ##VAR DEFMEMSLOTS=<number> Default memory slots
 # Cases to consider :
 # - nvdimm rootfs image
@@ -214,6 +214,11 @@ DEFVFIOMODE := guest-kernel
 DEFBINDMOUNTS := []
 DEFDANCONF := /run/kata-containers/dans
 DEFFORCEGUESTPULL := false
+# Default memory and vcpus for workloads within the sandbox when no workload values are requested.
+DEFSTATICSANDBOXWORKLOADMEM ?= 2048
+DEFSTATICSANDBOXWORKLOADVCPUS ?= 1
+# Minimum memory (in MiB) a pod must request when explicitly setting a memory limit.
+DEFSANDBOXWORKLOADMEMMIN ?= 128
 QEMUTDXQUOTEGENERATIONSERVICESOCKETPORT := 4050
 
 # Create Container Timeout in seconds
@@ -622,6 +627,9 @@ USER_VARS += KATA_INSTALL_OWNER
 USER_VARS += KATA_INSTALL_CFG_PERMS
 USER_VARS += DEFDANCONF
 USER_VARS += DEFFORCEGUESTPULL
+USER_VARS += DEFSTATICSANDBOXWORKLOADMEM
+USER_VARS += DEFSTATICSANDBOXWORKLOADVCPUS
+USER_VARS += DEFSANDBOXWORKLOADMEMMIN
 USER_VARS += QEMUTDXQUOTEGENERATIONSERVICESOCKETPORT
 USER_VARS += DEFCREATECONTAINERTIMEOUT
 USER_VARS += DEFCREATECONTAINERTIMEOUT_COCO

src/runtime-rs/config/configuration-cloud-hypervisor.toml.in

@@ -522,6 +522,21 @@ enable_pprof = false
 # - When running single containers using a tool like ctr, container sizing information will be available.
 static_sandbox_resource_mgmt = @DEFSTATICRESOURCEMGMT_CLH@
 
+# If set, the runtime will use the value as the default workload memory in MiB for the sandbox when no workload memory request is passed
+# down to the shim via the OCI when static sandbox resource management is enabled. With this, we ensure that workloads have a proper
+# default amount of memory available within the sandbox.
+static_sandbox_default_workload_mem = @DEFSTATICSANDBOXWORKLOADMEM@
+
+# If set, the runtime will use the value as the default number of vcpus for the sandbox when no workload vcpu request is passed
+# down to the shim via the OCI when static sandbox resource management is enabled. With this, we ensure that workloads have a proper
+# default amount of vcpus available within the sandbox.
+static_sandbox_default_workload_vcpus = @DEFSTATICSANDBOXWORKLOADVCPUS@
+
+# The runtime will enforce that pods explicitly setting memory limits using
+# resources.limits.memory allow at least this amount of memory in MiB so
+# that the sandbox can properly start.
+sandbox_workload_mem_min = @DEFSANDBOXWORKLOADMEMMIN@
+
 # If specified, sandbox_bind_mounts identifieds host paths to be mounted(ro, rw) into the sandboxes shared path.
 # This is only valid if filesystem sharing is utilized. The provided path(s) will be bindmounted into the shared fs directory.
 # If defaults are utilized, these mounts should be available in the guest at `/run/kata-containers/shared/containers/sandbox-mounts`

src/runtime-rs/crates/resource/src/cpu_mem/initial_size.rs

@@ -143,6 +143,17 @@ impl InitialSizeManager {
         if self.resource.vcpu > 0.0 {
             info!(sl!(), "resource with vcpu {}", self.resource.vcpu);
         }
+
+        if config.runtime.static_sandbox_resource_mgmt {
+            if self.resource.mem_mb == 0 {
+                self.resource.mem_mb = config.runtime.static_sandbox_default_workload_mem;
+            }
+
+            if self.resource.vcpu == 0.0 {
+                self.resource.vcpu = config.runtime.static_sandbox_default_workload_vcpus;
+            }
+        }
+
         self.resource.orig_toml_default_mem = hv.memory_info.default_memory;
         if self.resource.mem_mb > 0 {
             // since the memory overhead introduced by kata-agent and system components
@@ -152,12 +163,24 @@ impl InitialSizeManager {
             // use memory as they orignally expected, it would be easy to OOM.)
             hv.memory_info.default_memory += self.resource.mem_mb;
         }
+
+        if self.resource.vcpu > 0.0 {
+            hv.cpu_info.default_vcpus += self.resource.vcpu;
+        }
         Ok(())
     }
 
     pub fn get_orig_toml_default_mem(&self) -> u32 {
         self.resource.orig_toml_default_mem
     }
+
+    /// Returns the effective workload memory for the pod/container (in MiB).
+    /// This may be either explicitly requested in the spec or defaulted by static
+    /// sandbox resource management. 0 means no explicit limit was set and no default
+    /// workload memory was applied.
+    pub fn workload_mem_mb(&self) -> u32 {
+        self.resource.mem_mb
+    }
 }
 
 fn get_nr_vcpu(resource: &LinuxContainerCpuResources) -> f32 {
@@ -197,6 +220,7 @@ fn get_sizing_info(annotation: Annotation) -> Result<(u64, i64, i64)> {
 mod tests {
     use super::*;
     use kata_types::annotations::cri_containerd;
+    use kata_types::config::Hypervisor;
     use oci_spec::runtime::{LinuxBuilder, LinuxMemory, LinuxMemoryBuilder, LinuxResourcesBuilder};
     use std::collections::HashMap;
     #[derive(Clone)]
@@ -366,4 +390,72 @@ mod tests {
             );
         }
     }
+
+    fn get_config_for_setup_tests(
+        base_vcpus: f32,
+        base_mem_mb: u32,
+        static_mgmt: bool,
+        default_workload_vcpus: f32,
+        default_workload_mem_mb: u32,
+    ) -> TomlConfig {
+        let hypervisor_name = "test-hv".to_string();
+        let mut config = TomlConfig::default();
+        config.runtime.hypervisor_name = hypervisor_name.clone();
+        config.runtime.static_sandbox_resource_mgmt = static_mgmt;
+        config.runtime.static_sandbox_default_workload_vcpus = default_workload_vcpus;
+        config.runtime.static_sandbox_default_workload_mem = default_workload_mem_mb;
+
+        let mut hv = Hypervisor::default();
+        hv.cpu_info.default_vcpus = base_vcpus;
+        hv.memory_info.default_memory = base_mem_mb;
+        config.hypervisor.insert(hypervisor_name, hv);
+
+        config
+    }
+
+    #[test]
+    fn test_setup_config_static_defaults_unset_resources() {
+        let mut manager = InitialSizeManager {
+            resource: InitialSize {
+                vcpu: 0.0,
+                mem_mb: 0,
+                orig_toml_default_mem: 0,
+            },
+        };
+        let mut config = get_config_for_setup_tests(2.0, 256, true, 1.0, 512);
+
+        manager.setup_config(&mut config).unwrap();
+
+        let hv = config
+            .hypervisor
+            .get(&config.runtime.hypervisor_name)
+            .unwrap();
+        assert_eq!(hv.cpu_info.default_vcpus, 3.0);
+        assert_eq!(hv.memory_info.default_memory, 768);
+        assert_eq!(manager.get_orig_toml_default_mem(), 256);
+        assert_eq!(manager.workload_mem_mb(), 512);
+    }
+
+    #[test]
+    fn test_setup_config_static_preserves_explicit_resources() {
+        let mut manager = InitialSizeManager {
+            resource: InitialSize {
+                vcpu: 1.5,
+                mem_mb: 1024,
+                orig_toml_default_mem: 0,
+            },
+        };
+        let mut config = get_config_for_setup_tests(2.0, 256, true, 3.0, 512);
+
+        manager.setup_config(&mut config).unwrap();
+
+        let hv = config
+            .hypervisor
+            .get(&config.runtime.hypervisor_name)
+            .unwrap();
+        assert_eq!(hv.cpu_info.default_vcpus, 3.5);
+        assert_eq!(hv.memory_info.default_memory, 1280);
+        assert_eq!(manager.get_orig_toml_default_mem(), 256);
+        assert_eq!(manager.workload_mem_mb(), 1024);
+    }
 }

src/runtime-rs/crates/resource/src/network/network_info/network_info_from_link.rs

@@ -5,6 +5,7 @@
 //
 
 use std::{
+    collections::HashSet,
     convert::TryFrom,
     net::{IpAddr, Ipv4Addr, Ipv6Addr},
 };
@@ -42,6 +43,12 @@ impl NetworkInfoFromLink {
     ) -> Result<Self> {
         let attrs = link.attrs();
         let name = &attrs.name;
+        let routes = handle_routes(handle, attrs)
+            .await
+            .context("handle routes")?;
+        let neighs = handle_neighbors(handle, attrs, &routes)
+            .await
+            .context("handle neighbours")?;
 
         Ok(Self {
             interface: Interface {
@@ -54,12 +61,8 @@ impl NetworkInfoFromLink {
                 field_type: link.r#type().to_string(),
                 raw_flags: attrs.flags & libc::IFF_NOARP as u32,
             },
-            neighs: handle_neighbors(handle, attrs)
-                .await
-                .context("handle neighbours")?,
-            routes: handle_routes(handle, attrs)
-                .await
-                .context("handle routes")?,
+            neighs,
+            routes,
         })
     }
 }
@@ -147,11 +150,49 @@ fn generate_neigh(name: &str, n: &NeighbourMessage) -> Result<ARPNeighbor> {
     Ok(neigh)
 }
 
+fn gateway_set_from_routes(routes: &[Route]) -> HashSet<String> {
+    let mut gateway_set = HashSet::new();
+    for route in routes {
+        if route.gateway.is_empty() {
+            continue;
+        }
+
+        // Default routes may be represented with an empty destination string or
+        // an all-zero destination.
+        if route.dest.is_empty() || route.dest == "0.0.0.0" || route.dest == "::" {
+            gateway_set.insert(route.gateway.clone());
+        }
+    }
+
+    gateway_set
+}
+
+fn valid_guest_neighbor(neigh: &ARPNeighbor, gateway_set: &HashSet<String>) -> bool {
+    // We need a MAC address in the guest ARP table.
+    if neigh.ll_addr.is_empty() {
+        return false;
+    }
+
+    // Keep all static entries.
+    if neigh.state == libc::NUD_PERMANENT as i32 {
+        return true;
+    }
+
+    // Gateway-only exception: allow default-gateway neighbors.
+    neigh
+        .to_ip_address
+        .as_ref()
+        .map(|ip| gateway_set.contains(&ip.address))
+        .unwrap_or(false)
+}
+
 async fn handle_neighbors(
     handle: &rtnetlink::Handle,
     attrs: &LinkAttrs,
+    routes: &[Route],
 ) -> Result<Vec<ARPNeighbor>> {
     let name = &attrs.name;
+    let gateway_set = gateway_set_from_routes(routes);
     let mut neighs = vec![];
     let mut neigh_msg_list = handle.neighbours().get().execute();
     while let Some(neigh) = neigh_msg_list
@@ -161,7 +202,10 @@ async fn handle_neighbors(
     {
         // get neigh filter with index
         if neigh.header.ifindex == attrs.index {
-            neighs.push(generate_neigh(name, &neigh).context("generate neigh")?)
+            let neigh = generate_neigh(name, &neigh).context("generate neigh")?;
+            if valid_guest_neighbor(&neigh, &gateway_set) {
+                neighs.push(neigh);
+            }
         }
     }
     Ok(neighs)

src/runtime-rs/crates/runtimes/src/manager.rs

@@ -33,13 +33,13 @@ use netns_rs::{Env, NetNs};
 use nix::{sys::statfs, unistd::User};
 use oci_spec::runtime as oci;
 use persist::sandbox_persist::Persist;
+use protobuf::Message as ProtobufMessage;
 use resource::{
     cpu_mem::initial_size::InitialSizeManager,
     network::{dan_config_path, generate_netns_name},
 };
 use runtime_spec as spec;
 use shim_interface::shim_mgmt::ERR_NO_SHIM_SERVER;
-use protobuf::Message as ProtobufMessage;
 use std::{
     collections::HashMap,
     env,
@@ -218,6 +218,16 @@ impl RuntimeHandlerManagerInner {
             .setup_config(&mut config)
             .context("failed to setup static resource mgmt config")?;
 
+        let mem_min = config.runtime.sandbox_workload_mem_min;
+        let workload_mem = initial_size_manager.workload_mem_mb();
+        if workload_mem < mem_min {
+            return Err(anyhow!(
+                "pod memory limit too low: minimum {}MiB, got {}MiB",
+                mem_min,
+                workload_mem
+            ));
+        }
+
         update_component_log_level(&config);
 
         let dan_path = dan_config_path(&config, &self.id);

tools/osbuilder/node-builder/azure-linux/Makefile

@@ -5,6 +5,7 @@
 BUILD_TYPE := release
 
 export SHIM_REDEPLOY_CONFIG := yes
+export USE_RUNTIME_RS := yes
 
 ifeq ($(BUILD_TYPE),debug)
 	export AGENT_BUILD_TYPE := debug