Add CCA feature

This is WIP

Signed-off-by: Matias Ezequiel Vara Larsen <[email protected]>

Author: MatiasVara

Makefile

@@ -27,6 +27,9 @@ ifeq ($(SEV),1)
     INIT_SRC += $(SNP_INIT_SRC)
 	BUILD_INIT = 0
 endif
+ifeq ($(CCA), 1)
+    FEATURE_FLAGS := --features cca
+endif
 ifeq ($(GPU),1)
     FEATURE_FLAGS += --features gpu
 endif

src/arch/src/aarch64/fdt.rs

@@ -285,7 +285,10 @@ fn create_psci_node(fdt: &mut FdtWriter) -> Result<()> {
     // Two methods available: hvc and smc.
     // As per documentation, PSCI calls between a guest and hypervisor may use the HVC conduit instead of SMC.
     // So, since we are using kvm, we need to use hvc.
+    #[cfg(not(feature = "cca"))]
     fdt.property_string("method", "hvc")?;
+    #[cfg(feature = "cca")]
+    fdt.property_string("method", "smc")?;
     fdt.end_node(node)?;
 
     Ok(())

src/arch/src/aarch64/linux/regs.rs

@@ -125,8 +125,10 @@ arm64_sys_reg!(MPIDR_EL1, 3, 0, 0, 0, 5);
 /// * `boot_ip` - Starting instruction pointer.
 /// * `mem` - Reserved DRAM for current VM.
 pub fn setup_regs(vcpu: &VcpuFd, cpu_id: u8, boot_ip: u64, mem: &GuestMemoryMmap) -> Result<()> {
-    // Get the register index of the PSTATE (Processor State) register.
+    // PSTATE cannot be accesed from the host in CCA
+    #[cfg(not(feature = "cca"))]
     #[allow(deref_nullptr)]
+    // Get the register index of the PSTATE (Processor State) register.
     vcpu.set_one_reg(arm64_core_reg!(pstate), &PSTATE_FAULT_BITS_64.to_le_bytes())
         .map_err(Error::SetCoreRegister)?;
 

src/arch/src/aarch64/mod.rs

@@ -69,7 +69,7 @@ pub fn arch_memory_regions(size: usize) -> (ArchMemoryInfo, Vec<(GuestAddress, u
     } else {
         vec![
             (GuestAddress(layout::DRAM_MEM_START), dram_size),
-            (GuestAddress(shm_start_addr), MMIO_SHM_SIZE as usize),
+            //(GuestAddress(shm_start_addr), MMIO_SHM_SIZE as usize),
         ]
     };
 

src/vmm/src/builder.rs

@@ -3,8 +3,10 @@
 
 //! Enables pre-boot setup, instantiation and booting of a Firecracker VMM.
 
+use cca::Algo;
 #[cfg(target_os = "macos")]
 use crossbeam_channel::{unbounded, Sender};
+use std::cmp::max;
 use std::fmt::{Display, Formatter};
 use std::fs::File;
 use std::io;
@@ -29,9 +31,6 @@ use devices::virtio::{port_io, MmioTransport, PortDescription, Vsock};
 #[cfg(target_os = "macos")]
 use hvf::MemoryMapping;
 
-#[cfg(feature = "tee")]
-use kbs_types::Tee;
-
 use crate::device_manager;
 #[cfg(feature = "tee")]
 use crate::resources::TeeConfig;
@@ -49,13 +48,16 @@ use crate::vmm_config::fs::FsBuilder;
 use crate::vmm_config::kernel_bundle::{InitrdBundle, QbootBundle};
 #[cfg(target_os = "linux")]
 use crate::vstate::KvmContext;
-#[cfg(all(target_os = "linux", feature = "tee"))]
+#[cfg(all(target_os = "linux", any(feature = "tee", feature = "cca")))]
 use crate::vstate::MeasuredRegion;
 use crate::vstate::{Error as VstateError, Vcpu, VcpuConfig, Vm};
+use arch::aarch64::layout;
 use arch::ArchMemoryInfo;
 #[cfg(feature = "tee")]
 use arch::InitrdConfig;
 #[cfg(feature = "tee")]
+use kbs_types::Tee;
+#[cfg(feature = "tee")]
 use kvm_bindings::KVM_MAX_CPUID_ENTRIES;
 use libc::{STDERR_FILENO, STDIN_FILENO, STDOUT_FILENO};
 use nix::unistd::isatty;
@@ -68,7 +70,9 @@ use vm_memory::mmap::MmapRegion;
 #[cfg(any(target_arch = "aarch64", feature = "tee"))]
 use vm_memory::Bytes;
 use vm_memory::GuestMemory;
-use vm_memory::{GuestAddress, GuestMemoryMmap};
+use vm_memory::{Address, GuestAddress, GuestMemoryMmap, GuestMemoryRegion};
+
+use kvm_bindings::KVM_ARM_VCPU_REC;
 
 #[cfg(feature = "efi")]
 static EDK2_BINARY: &[u8] = include_bytes!("../../../edk2/KRUN_EFI.silent.fd");
@@ -433,19 +437,49 @@ pub fn build_microvm(
         m
     };
 
+    #[cfg(feature = "cca")]
+    // TODO: to fix the regions that require measurement
+    let measured_regions = {
+        let m = vec![
+            MeasuredRegion {
+                guest_addr: kernel_bundle.guest_addr,
+                // TODO: remove host_addr
+                host_addr: guest_memory
+                    .get_host_address(GuestAddress(kernel_bundle.guest_addr))
+                    .unwrap() as u64,
+                size: vm_resources.vm_config().mem_size_mib.unwrap() << 20,
+                populate: true,
+            },
+            /*
+            MeasuredRegion {
+                guest_addr: kernel_bundle.guest_addr + kernel_bundle.size as u64,
+                host_addr: guest_memory
+                    .get_host_address(GuestAddress(kernel_bundle.guest_addr + kernel_bundle.size as u64))
+                    .unwrap() as u64,
+               // this is probably wrong
+                size: vm_resources.vm_config().mem_size_mib.unwrap() << 20 - kernel_bundle.size,
+                populate: false
+            },
+            */
+        ];
+
+        m
+    };
+
     // On x86_64 always create a serial device,
     // while on aarch64 only create it if 'console=' is specified in the boot args.
-    let serial_device = if cfg!(feature = "efi") {
+    // TODO: to comment this
+    let serial_device = //if cfg!(feature = "efi") {
         Some(setup_serial_device(
             event_manager,
             None,
-            None,
+            //None,
             // Uncomment this to get EFI output when debugging EDK2.
-            // Some(Box::new(io::stdout())),
-        )?)
-    } else {
-        None
-    };
+            Some(Box::new(io::stdout())),
+        )?);
+    //} else {
+    //    None
+    //};
 
     let exit_evt = EventFd::new(utils::eventfd::EFD_NONBLOCK)
         .map_err(Error::EventFd)
@@ -559,7 +593,7 @@ pub fn build_microvm(
         )?;
     }
 
-    #[cfg(not(feature = "tee"))]
+    #[cfg(all(not(feature = "tee"), not(feature = "cca")))]
     let _shm_region = Some(VirtioShmRegion {
         host_addr: guest_memory
             .get_host_address(GuestAddress(arch_memory_info.shm_start_addr))
@@ -683,6 +717,52 @@ pub fn build_microvm(
         println!("Starting TEE/microVM.");
     }
 
+    // after this point guest memory and regs are not accesible anymore
+    #[cfg(feature = "cca")]
+    {
+        let _ = vmm
+            .kvm_vm()
+            .realm
+            .configure_measurement(vmm.kvm_vm().fd(), Algo::AlgoSha256);
+
+        vmm.kvm_vm()
+            .realm
+            .create_realm_descriptor(vmm.kvm_vm().fd())
+            .unwrap();
+
+        println!("Injecting and measuring memory regions. This may take a while.");
+
+        for region in measured_regions.iter() {
+            if region.populate {
+                vmm.kvm_vm()
+                    .realm
+                    .populate(
+                        vmm.kvm_vm().fd(),
+                        region.guest_addr,
+                        region.size.try_into().unwrap(),
+                    )
+                    .unwrap();
+            } else {
+                vmm.kvm_vm()
+                    .realm
+                    .initiate(
+                        vmm.kvm_vm().fd(),
+                        region.guest_addr,
+                        region.size.try_into().unwrap(),
+                    )
+                    .unwrap();
+            }
+        }
+
+        let feature = KVM_ARM_VCPU_REC as i32;
+
+        for vcpu in vcpus.iter() {
+            vcpu.fd.vcpu_finalize(&feature).unwrap();
+        }
+
+        vmm.kvm_vm().realm.activate(vmm.kvm_vm().fd()).unwrap();
+    }
+
     vmm.start_vcpus(vcpus)
         .map_err(StartMicrovmError::Internal)?;
 
@@ -809,7 +889,7 @@ fn load_cmdline(vmm: &Vmm) -> std::result::Result<(), StartMicrovmError> {
     .map_err(StartMicrovmError::LoadCommandline)
 }
 
-#[cfg(all(target_os = "linux", not(feature = "tee")))]
+#[cfg(all(target_os = "linux", not(feature = "tee"), not(feature = "cca")))]
 pub(crate) fn setup_vm(
     guest_memory: &GuestMemoryMmap,
 ) -> std::result::Result<Vm, StartMicrovmError> {
@@ -824,6 +904,29 @@ pub(crate) fn setup_vm(
         .map_err(StartMicrovmError::Internal)?;
     Ok(vm)
 }
+#[cfg(all(target_os = "linux", feature = "cca"))]
+pub(crate) fn setup_vm(
+    guest_memory: &GuestMemoryMmap,
+) -> std::result::Result<Vm, StartMicrovmError> {
+    let kvm = KvmContext::new()
+        .map_err(Error::KvmContext)
+        .map_err(StartMicrovmError::Internal)?;
+
+    // calculate max_addr for max_ipa
+    let mut max_addr = 0;
+    for (_index, region) in guest_memory.iter().enumerate() {
+        max_addr = max(max_addr, region.start_addr().raw_value() + region.len() - 1);
+    }
+
+    let mut vm = Vm::new(kvm.fd(), max_addr as usize)
+        .map_err(Error::Vm)
+        .map_err(StartMicrovmError::Internal)?;
+
+    vm.memory_init(guest_memory, kvm.max_memslots(), true)
+        .map_err(Error::Vm)
+        .map_err(StartMicrovmError::Internal)?;
+    Ok(vm)
+}
 #[cfg(all(target_os = "linux", feature = "tee"))]
 pub(crate) fn setup_vm(
     kvm: &KvmContext,
@@ -1021,7 +1124,7 @@ fn create_vcpus_aarch64(
 ) -> super::Result<Vec<Vcpu>> {
     let mut vcpus = Vec::with_capacity(vcpu_config.vcpu_count as usize);
     for cpu_index in 0..vcpu_config.vcpu_count {
-        let mut vcpu = Vcpu::new_aarch64(
+        let mut vcpu: Vcpu = Vcpu::new_aarch64(
             cpu_index,
             vm.fd(),
             exit_evt.try_clone().map_err(Error::EventFd)?,

src/vmm/src/lib.rs

@@ -55,15 +55,20 @@ use crate::vstate::{Vcpu, VcpuHandle, VcpuResponse, Vm};
 use arch::ArchMemoryInfo;
 use arch::DeviceType;
 use arch::InitrdConfig;
+use cca::Algo;
 #[cfg(target_os = "macos")]
 use crossbeam_channel::Sender;
 use devices::virtio::VmmExitObserver;
 use devices::BusDevice;
 use kernel::cmdline::Cmdline as KernelCmdline;
+use kvm_bindings::KVM_ARM_VCPU_REC;
 use polly::event_manager::{self, EventManager, Subscriber};
 use utils::epoll::{EpollEvent, EventSet};
 use utils::eventfd::EventFd;
+use vm_memory::Address;
+use vm_memory::GuestMemory;
 use vm_memory::GuestMemoryMmap;
+use vm_memory::GuestMemoryRegion;
 
 /// Success exit code.
 pub const FC_EXIT_CODE_OK: u8 = 0;