diff --git a/src/runtime-rs/crates/hypervisor/src/ch/inner.rs b/src/runtime-rs/crates/hypervisor/src/ch/inner.rs
index 3a0322ee0a..d48bf0143e 100644
--- a/src/runtime-rs/crates/hypervisor/src/ch/inner.rs
+++ b/src/runtime-rs/crates/hypervisor/src/ch/inner.rs
@@ -88,6 +88,7 @@ impl CloudHypervisorInner {
         capabilities.set(
             CapabilityBits::BlockDeviceSupport
                 | CapabilityBits::BlockDeviceHotplugSupport
+                | CapabilityBits::BlockDeviceDiscardSupport
                 | CapabilityBits::FsSharingSupport
                 | CapabilityBits::HybridVsockSupport,
         );
diff --git a/src/runtime-rs/crates/hypervisor/src/ch/inner_hypervisor.rs b/src/runtime-rs/crates/hypervisor/src/ch/inner_hypervisor.rs
index bd7f3d5e17..bd5e8003c4 100644
--- a/src/runtime-rs/crates/hypervisor/src/ch/inner_hypervisor.rs
+++ b/src/runtime-rs/crates/hypervisor/src/ch/inner_hypervisor.rs
@@ -807,10 +807,12 @@ impl CloudHypervisorInner {
             // TDX does not permit the use of virtio-fs.
             CapabilityBits::BlockDeviceSupport
                 | CapabilityBits::BlockDeviceHotplugSupport
+                | CapabilityBits::BlockDeviceDiscardSupport
                 | CapabilityBits::HybridVsockSupport
         } else {
             CapabilityBits::BlockDeviceSupport
                 | CapabilityBits::BlockDeviceHotplugSupport
+                | CapabilityBits::BlockDeviceDiscardSupport
                 | CapabilityBits::FsSharingSupport
                 | CapabilityBits::HybridVsockSupport
         };
diff --git a/src/runtime-rs/crates/hypervisor/src/dragonball/inner.rs b/src/runtime-rs/crates/hypervisor/src/dragonball/inner.rs
index 01d3ca400e..78be874670 100644
--- a/src/runtime-rs/crates/hypervisor/src/dragonball/inner.rs
+++ b/src/runtime-rs/crates/hypervisor/src/dragonball/inner.rs
@@ -97,6 +97,7 @@ impl DragonballInner {
         capabilities.set(
             CapabilityBits::BlockDeviceSupport
                 | CapabilityBits::BlockDeviceHotplugSupport
+                | CapabilityBits::BlockDeviceDiscardSupport
                 | CapabilityBits::FsSharingSupport
                 | CapabilityBits::HybridVsockSupport
                 | CapabilityBits::GuestMemoryProbe,
diff --git a/src/runtime-rs/crates/hypervisor/src/qemu/inner.rs b/src/runtime-rs/crates/hypervisor/src/qemu/inner.rs
index 0257825065..30a80fc747 100644
--- a/src/runtime-rs/crates/hypervisor/src/qemu/inner.rs
+++ b/src/runtime-rs/crates/hypervisor/src/qemu/inner.rs
@@ -763,10 +763,13 @@ impl QemuInner {
         let flags = if self.hypervisor_config().security_info.confidential_guest
             || self.hypervisor_config().shared_fs.shared_fs.is_none()
         {
-            CapabilityBits::BlockDeviceSupport | CapabilityBits::BlockDeviceHotplugSupport
+            CapabilityBits::BlockDeviceSupport
+                | CapabilityBits::BlockDeviceHotplugSupport
+                | CapabilityBits::BlockDeviceDiscardSupport
         } else {
             CapabilityBits::BlockDeviceSupport
                 | CapabilityBits::BlockDeviceHotplugSupport
+                | CapabilityBits::BlockDeviceDiscardSupport
                 | CapabilityBits::FsSharingSupport
         };
         caps.set(flags);