diff --git a/full-node/src/run/consensus_service.rs b/full-node/src/run/consensus_service.rs
index a2b0c4f81..40f683f16 100644
--- a/full-node/src/run/consensus_service.rs
+++ b/full-node/src/run/consensus_service.rs
@@ -693,6 +693,7 @@ impl SyncBackground {
                     parent_runtime,
                     block_body_capacity: 0, // TODO: could be set to the size of the tx pool
                     top_trie_root_calculation_cache: None, // TODO: pretty important for performances
+                    max_log_level: 0,
                 })
             };
 
diff --git a/lib/src/author/build.rs b/lib/src/author/build.rs
index 5c376e2b8..432cb89f7 100644
--- a/lib/src/author/build.rs
+++ b/lib/src/author/build.rs
@@ -229,6 +229,7 @@ impl AuthoringStart {
                     })
                 }
             },
+            max_log_level: config.max_log_level,
         });
 
         let inherent_data = inherents::InherentData {
@@ -275,6 +276,14 @@ pub struct AuthoringStartConfig<'a> {
     /// Capacity to reserve for the number of extrinsics. Should be higher than the approximate
     /// number of extrinsics that are going to be applied.
     pub block_body_capacity: usize,
+
+    /// Maximum log level of the runtime.
+    ///
+    /// > **Note**: This value is opaque from the point of the view of the client, and the runtime
+    /// >           is free to interpret it the way it wants. However, usually values are: `0` for
+    /// >           "off", `1` for "error", `2` for "warn", `3` for "info", `4` for "debug",
+    /// >           and `5` for "trace".
+    pub max_log_level: u32,
 }
 
 /// More transactions can be added.
diff --git a/lib/src/author/runtime.rs b/lib/src/author/runtime.rs
index d3f53aac5..034332e55 100644
--- a/lib/src/author/runtime.rs
+++ b/lib/src/author/runtime.rs
@@ -91,6 +91,14 @@ pub struct Config<'a> {
     /// Capacity to reserve for the number of extrinsics. Should be higher than the approximate
     /// number of extrinsics that are going to be applied.
     pub block_body_capacity: usize,
+
+    /// Maximum log level of the runtime.
+    ///
+    /// > **Note**: This value is opaque from the point of the view of the client, and the runtime
+    /// >           is free to interpret it the way it wants. However, usually values are: `0` for
+    /// >           "off", `1` for "error", `2` for "warn", `3` for "info", `4` for "debug",
+    /// >           and `5` for "trace".
+    pub max_log_level: u32,
 }
 
 /// Extra configuration depending on the consensus algorithm.
@@ -185,6 +193,7 @@ pub fn build_block(config: Config) -> BlockBuild {
         top_trie_root_calculation_cache: config.top_trie_root_calculation_cache,
         storage_top_trie_changes: Default::default(),
         offchain_storage_changes: Default::default(),
+        max_log_level: config.max_log_level,
     });
 
     let vm = match init_result {
@@ -196,6 +205,7 @@ pub fn build_block(config: Config) -> BlockBuild {
         stage: Stage::InitializeBlock,
         block_body: Vec::with_capacity(config.block_body_capacity),
         logs: String::new(),
+        max_log_level: config.max_log_level,
     };
 
     BlockBuild::from_inner(vm, shared)
@@ -322,6 +332,7 @@ impl BlockBuild {
                         ),
                         storage_top_trie_changes: success.storage_top_trie_changes,
                         offchain_storage_changes: success.offchain_storage_changes,
+                        max_log_level: shared.max_log_level,
                     });
 
                     inner = Inner::Runtime(match init_result {
@@ -447,6 +458,8 @@ struct Shared {
     block_body: Vec<Vec<u8>>,
     /// Concatenation of all logs produced by the multiple calls.
     logs: String,
+    /// Value provided by [`Config::max_log_level`].
+    max_log_level: u32,
 }
 
 /// The block building process is separated into multiple stages.
@@ -515,6 +528,7 @@ impl InherentExtrinsics {
             top_trie_root_calculation_cache: Some(self.top_trie_root_calculation_cache),
             storage_top_trie_changes: self.storage_top_trie_changes,
             offchain_storage_changes: self.offchain_storage_changes,
+            max_log_level: self.shared.max_log_level,
         });
 
         let vm = match init_result {
@@ -548,6 +562,7 @@ impl ApplyExtrinsic {
             top_trie_root_calculation_cache: Some(self.top_trie_root_calculation_cache),
             storage_top_trie_changes: self.storage_top_trie_changes,
             offchain_storage_changes: self.offchain_storage_changes,
+            max_log_level: self.shared.max_log_level,
         });
 
         self.shared.stage = Stage::ApplyExtrinsic(extrinsic);
@@ -571,6 +586,7 @@ impl ApplyExtrinsic {
             top_trie_root_calculation_cache: Some(self.top_trie_root_calculation_cache),
             storage_top_trie_changes: self.storage_top_trie_changes,
             offchain_storage_changes: self.offchain_storage_changes,
+            max_log_level: self.shared.max_log_level,
         });
 
         let vm = match init_result {
diff --git a/lib/src/author/runtime/tests.rs b/lib/src/author/runtime/tests.rs
index 47bb0401a..7e5014836 100644
--- a/lib/src/author/runtime/tests.rs
+++ b/lib/src/author/runtime/tests.rs
@@ -41,6 +41,7 @@ fn block_building_works() {
             slot_number: 1234u64,
         }),
         top_trie_root_calculation_cache: None,
+        max_log_level: 0,
     });
 
     loop {
diff --git a/lib/src/chain/blocks_tree/verify.rs b/lib/src/chain/blocks_tree/verify.rs
index e036e1102..ae115a8fd 100644
--- a/lib/src/chain/blocks_tree/verify.rs
+++ b/lib/src/chain/blocks_tree/verify.rs
@@ -809,6 +809,7 @@ impl<T> BodyVerifyRuntimeRequired<T> {
             parent_block_header: parent_block_header.into(),
             block_body,
             top_trie_root_calculation_cache,
+            max_log_level: 0,
         });
 
         self.context.with_body_verify(process)
diff --git a/lib/src/chain/chain_information/build.rs b/lib/src/chain/chain_information/build.rs
index 054a4e0a0..f22da7e8f 100644
--- a/lib/src/chain/chain_information/build.rs
+++ b/lib/src/chain/chain_information/build.rs
@@ -391,6 +391,7 @@ impl ChainInformationBuild {
                 function_to_call: call.function_name(),
                 parameter: call.parameter_vectored(),
                 virtual_machine: inner.virtual_machine.take().unwrap(),
+                max_log_level: 0,
             });
 
             let vm = match vm_start_result {
diff --git a/lib/src/executor/read_only_runtime_host.rs b/lib/src/executor/read_only_runtime_host.rs
index 2d7390779..ca0d8cc29 100644
--- a/lib/src/executor/read_only_runtime_host.rs
+++ b/lib/src/executor/read_only_runtime_host.rs
@@ -35,6 +35,14 @@ pub struct Config<'a, TParams> {
     /// Parameter of the call, as an iterator of bytes. The concatenation of bytes forms the
     /// actual input.
     pub parameter: TParams,
+
+    /// Maximum log level of the runtime.
+    ///
+    /// > **Note**: This value is opaque from the point of the view of the client, and the runtime
+    /// >           is free to interpret it the way it wants. However, usually values are: `0` for
+    /// >           "off", `1` for "error", `2` for "warn", `3` for "info", `4` for "debug",
+    /// >           and `5` for "trace".
+    pub max_log_level: u32,
 }
 
 /// Start running the WebAssembly virtual machine.
@@ -47,6 +55,7 @@ pub fn run(
             .run_vectored(config.function_to_call, config.parameter)?
             .into(),
         logs: String::new(),
+        max_log_level: config.max_log_level,
     }
     .run())
 }
@@ -339,6 +348,8 @@ struct Inner {
     vm: host::HostVm,
     /// Concatenation of all the log messages generated by the runtime.
     logs: String,
+    /// Value provided by [`Config::max_log_level`].
+    max_log_level: u32,
 }
 
 impl Inner {
@@ -436,8 +447,7 @@ impl Inner {
                 }
 
                 host::HostVm::GetMaxLogLevel(resume) => {
-                    // TODO: make configurable?
-                    self.vm = resume.resume(0); // Off
+                    self.vm = resume.resume(self.max_log_level);
                 }
 
                 host::HostVm::LogEmit(req) => {
diff --git a/lib/src/executor/runtime_host.rs b/lib/src/executor/runtime_host.rs
index 4a25bcead..f99e2f93d 100644
--- a/lib/src/executor/runtime_host.rs
+++ b/lib/src/executor/runtime_host.rs
@@ -72,6 +72,14 @@ pub struct Config<'a, TParams> {
     /// Initial state of [`Success::offchain_storage_changes`]. The changes made during this
     /// execution will be pushed over the value in this field.
     pub offchain_storage_changes: storage_diff::StorageDiff,
+
+    /// Maximum log level of the runtime.
+    ///
+    /// > **Note**: This value is opaque from the point of the view of the client, and the runtime
+    /// >           is free to interpret it the way it wants. However, usually values are: `0` for
+    /// >           "off", `1` for "error", `2` for "warn", `3` for "info", `4` for "debug",
+    /// >           and `5` for "trace".
+    pub max_log_level: u32,
 }
 
 /// Start running the WebAssembly virtual machine.
@@ -99,6 +107,7 @@ pub fn run(
         ),
         root_calculation: None,
         logs: String::new(),
+        max_log_level: config.max_log_level,
     }
     .run())
 }
@@ -631,6 +640,9 @@ struct Inner {
 
     /// Concatenation of all the log messages generated by the runtime.
     logs: String,
+
+    /// Value provided by [`Config::max_log_level`].
+    max_log_level: u32,
 }
 
 impl Inner {
@@ -917,8 +929,7 @@ impl Inner {
                 }
 
                 host::HostVm::GetMaxLogLevel(resume) => {
-                    // TODO: make configurable?
-                    self.vm = resume.resume(0); // Off
+                    self.vm = resume.resume(self.max_log_level);
                 }
 
                 host::HostVm::LogEmit(req) => {
diff --git a/lib/src/transactions/validate.rs b/lib/src/transactions/validate.rs
index 2e9d721ef..b2b6bc475 100644
--- a/lib/src/transactions/validate.rs
+++ b/lib/src/transactions/validate.rs
@@ -48,6 +48,14 @@ pub struct Config<'a, TTx> {
     /// This information is passed to the runtime, which might perform some additional
     /// verifications if the source isn't trusted.
     pub source: TransactionSource,
+
+    /// Maximum log level of the runtime.
+    ///
+    /// > **Note**: This value is opaque from the point of the view of the client, and the runtime
+    /// >           is free to interpret it the way it wants. However, usually values are: `0` for
+    /// >           "off", `1` for "error", `2` for "warn", `3` for "info", `4` for "debug",
+    /// >           and `5` for "trace".
+    pub max_log_level: u32,
 }
 
 /// Source of the transaction.
@@ -327,6 +335,7 @@ pub fn validate_transaction(
                 top_trie_root_calculation_cache: None,
                 storage_top_trie_changes: storage_diff::StorageDiff::empty(),
                 offchain_storage_changes: storage_diff::StorageDiff::empty(),
+                max_log_level: config.max_log_level,
             });
 
             // Information used later, after `Core_initialize_block` is done.
@@ -363,6 +372,7 @@ pub fn validate_transaction(
                 top_trie_root_calculation_cache: None,
                 storage_top_trie_changes: storage_diff::StorageDiff::empty(),
                 offchain_storage_changes: storage_diff::StorageDiff::empty(),
+                max_log_level: config.max_log_level,
             });
 
             match vm {
@@ -454,6 +464,7 @@ impl Query {
                         top_trie_root_calculation_cache: Some(
                             success.top_trie_root_calculation_cache,
                         ),
+                        max_log_level: 0,
                     });
 
                     match vm {
diff --git a/lib/src/verify/header_body.rs b/lib/src/verify/header_body.rs
index 1ff311aeb..9f43cf924 100644
--- a/lib/src/verify/header_body.rs
+++ b/lib/src/verify/header_body.rs
@@ -70,6 +70,14 @@ pub struct Config<'a, TBody> {
     /// Optional cache corresponding to the storage trie root hash calculation of the parent
     /// block.
     pub top_trie_root_calculation_cache: Option<calculate_root::CalculationCache>,
+
+    /// Maximum log level of the runtime.
+    ///
+    /// > **Note**: This value is opaque from the point of the view of the client, and the runtime
+    /// >           is free to interpret it the way it wants. However, usually values are: `0` for
+    /// >           "off", `1` for "error", `2` for "warn", `3` for "info", `4` for "debug",
+    /// >           and `5` for "trace".
+    pub max_log_level: u32,
 }
 
 /// Extra items of [`Config`] that are dependant on the consensus engine of the chain.
@@ -364,6 +372,7 @@ pub fn verify(
             top_trie_root_calculation_cache: config.top_trie_root_calculation_cache,
             storage_top_trie_changes: Default::default(),
             offchain_storage_changes: Default::default(),
+            max_log_level: config.max_log_level,
         });
 
         match vm {
@@ -443,6 +452,7 @@ impl VerifyInner {
                             ),
                             storage_top_trie_changes: success.storage_top_trie_changes,
                             offchain_storage_changes: success.offchain_storage_changes,
+                            max_log_level: 0,
                         });
 
                         match vm {
diff --git a/light-base/src/json_rpc_service.rs b/light-base/src/json_rpc_service.rs
index 96d347a8f..35c560599 100644
--- a/light-base/src/json_rpc_service.rs
+++ b/light-base/src/json_rpc_service.rs
@@ -1606,6 +1606,7 @@ impl<TPlat: Platform> Background<TPlat> {
             top_trie_root_calculation_cache: None,
             storage_top_trie_changes: Default::default(),
             offchain_storage_changes: Default::default(),
+            max_log_level: 0,
         }) {
             Ok(vm) => vm,
             Err((err, prototype)) => {
diff --git a/light-base/src/json_rpc_service/chain_head.rs b/light-base/src/json_rpc_service/chain_head.rs
index d554e674d..f049b2c84 100644
--- a/light-base/src/json_rpc_service/chain_head.rs
+++ b/light-base/src/json_rpc_service/chain_head.rs
@@ -194,6 +194,7 @@ impl<TPlat: Platform> Background<TPlat> {
                             top_trie_root_calculation_cache: None,
                             offchain_storage_changes: Default::default(),
                             storage_top_trie_changes: Default::default(),
+                            max_log_level: 0,
                         }) {
                             Err((error, prototype)) => {
                                 runtime_call_lock.unlock(prototype);
diff --git a/light-base/src/sync_service/parachain.rs b/light-base/src/sync_service/parachain.rs
index 92c017b68..a788a1e76 100644
--- a/light-base/src/sync_service/parachain.rs
+++ b/light-base/src/sync_service/parachain.rs
@@ -1127,6 +1127,7 @@ async fn parahead<TPlat: Platform>(
             parachain_id,
             para::OccupiedCoreAssumption::TimedOut,
         ),
+        max_log_level: 0,
     }) {
         Ok(vm) => vm,
         Err((err, prototype)) => {
diff --git a/light-base/src/transactions_service.rs b/light-base/src/transactions_service.rs
index 3c8369e1f..a3fc84aeb 100644
--- a/light-base/src/transactions_service.rs
+++ b/light-base/src/transactions_service.rs
@@ -1165,6 +1165,7 @@ async fn validate_transaction<TPlat: Platform>(
         block_number_bytes: relay_chain_sync.block_number_bytes(),
         scale_encoded_transaction: iter::once(scale_encoded_transaction),
         source,
+        max_log_level: 0,
     });
 
     loop {