mshv-ioctls/system: Enable Direct mode stimer

Enable direct mode for synthetic timer. This allows synthetic timer interrupts
to work early in the boot without having to wait for VMbus to be initialized.

Signed-off-by: Praveen K Paladugu <[email protected]>

mshv-ioctls/src/ioctls/system.rs

@@ -38,6 +38,8 @@ pub enum SyntheticProcessorFeature {
     AccessSynicRegs,
     /// Access to synthetic timers and associated MSRs (HV_X64_MSR_STIMER0_CONFIG through HV_X64_MSR_STIMER3_COUNT).Corresponds to access_synthetic_timer_regs privilege.
     AccessSyntheticTimerRegs,
+    /// Access to Synthetic timers in direct mode
+    DirectSyntheticTimers,
     /// Access to the reference TSC. Corresponds to access_partition_reference_tsc privilege.
     AccessPartitionReferenceTsc,
     /// Partition has access to frequency regs. corresponds to access_frequency_regs privilege.
@@ -148,6 +150,12 @@ impl MshvPartitionBuilder {
                     .__bindgen_anon_1
                     .set_access_synthetic_timer_regs(1);
             },
+            SyntheticProcessorFeature::DirectSyntheticTimers => unsafe {
+                self.mshv_partition
+                    .synthetic_processor_features
+                    .__bindgen_anon_1
+                    .set_direct_synthetic_timers(1);
+            },
             SyntheticProcessorFeature::AccessPartitionReferenceTsc => unsafe {
                 self.mshv_partition
                     .synthetic_processor_features
@@ -274,6 +282,7 @@ impl Mshv {
             )
             .set_synthetic_processor_feature(SyntheticProcessorFeature::AccessSynicRegs)
             .set_synthetic_processor_feature(SyntheticProcessorFeature::AccessSyntheticTimerRegs)
+            .set_synthetic_processor_feature(SyntheticProcessorFeature::DirectSyntheticTimers)
             .set_synthetic_processor_feature(SyntheticProcessorFeature::AccessPartitionReferenceTsc)
             .set_synthetic_processor_feature(SyntheticProcessorFeature::AccessFrequencyRegs)
             .set_synthetic_processor_feature(SyntheticProcessorFeature::AccessIntrCtrlRegs)