Merge pull request #9244 from Apokleos/dgb-gpu

runtime-rs/dragonball: add support building kernel with upcall and GPU hotplug

docs/use-cases/NVIDIA-GPU-passthrough-and-Kata.md

@@ -154,6 +154,29 @@ $ ./build-kernel.sh -v 5.15.23 -g nvidia build
 $ sudo -E ./build-kernel.sh -v 5.15.23 -g nvidia install
 ```
 
+However, there are special cases like `Dragonball VMM`. It directly supports device `hot-plug/hot-unplug`
+via upcall to avoid `ACPI` virtualization and minimize `VM` overhead. Since upcall isn't upstream kernel
+code, using `Dragonball VMM` for NVIDIA GPU `hot-plug/hot-unplug` requires applying the Upcall patchset in
+addition to the above kernel configuration items. Follow these steps to build for NVIDIA GPU `hot-[un]plug`
+for `Dragonball`:
+
+```sh 
+# Prepare .config to support both upcall and nvidia gpu 
+$ ./build-kernel.sh -v 5.10.25 -e -t dragonball -g nvidia -f setup
+
+# Build guest kernel to support both upcall and nvidia gpu 
+$ ./build-kernel.sh -v 5.10.25 -e -t dragonball -g nvidia build
+
+# Install guest kernel to support both upcall and nvidia gpu
+$ sudo -E ./build-kernel.sh -v 5.10.25 -e -t dragonball -g nvidia install
+```
+
+> **Note**:
+> - `-v 5.10.25` is for the guest kernel version.
+> - `-e` here means experimental, mainly because `upcall` patches are not in upstream Linux kernel.
+> - `-t dragonball` is for specifying hypervisor type.
+> - `-f` is for generating `.config` file.
+
 To build NVIDIA Driver in Kata container, `linux-headers` are required.
 This is a way to generate deb packages for `linux-headers`:
 

src/dragonball/src/dbs_arch/src/x86_64/regs.rs

@@ -379,7 +379,7 @@ mod tests {
         // tenth one (i.e the one with index msr_index::MSR_IA32_MISC_ENABLE has the data we
         // expect.
         let entry_vec = create_msr_entries();
-        assert_eq!(entry_vec[9], kvm_msrs.as_slice()[0]);
+        assert_eq!(entry_vec[10], kvm_msrs.as_slice()[0]);
     }
 
     #[test]

tools/packaging/kernel/configs/fragments/whitelist.conf

@@ -26,3 +26,4 @@ CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE
 CONFIG_SPECULATION_MITIGATIONS
 CONFIG_X86_SGX
 CONFIG_VIRTIO_IOMMU
+CONFIG_CRYPTO_ECDSA

tools/packaging/kernel/kata_config_version

@@ -1 +1 @@
-126
+127