refactor: move configure_system_for_boot into arch module

Split `configure_system_for_boot` into 2 arch specific functions
and move it into arch module.

Signed-off-by: Egor Lazarchuk <[email protected]>

Author: ShadowCurse

src/vmm/src/arch/aarch64/mod.rs

@@ -22,16 +22,23 @@ use std::ffi::CString;
 use std::fmt::Debug;
 use std::fs::File;
 
-use linux_loader::loader::KernelLoader;
 use linux_loader::loader::pe::PE as Loader;
+use linux_loader::loader::{Cmdline, KernelLoader};
 use vm_memory::GuestMemoryError;
 
 use self::gic::GICDevice;
+use crate::arch::aarch64::regs::Aarch64RegisterVec;
+use crate::arch::aarch64::vcpu::{VcpuArchError, get_registers};
 use crate::arch::{BootProtocol, DeviceType, EntryPoint};
+use crate::cpu_config::aarch64::{CpuConfiguration, CpuConfigurationError};
+use crate::cpu_config::templates::CustomCpuTemplate;
 use crate::device_manager::mmio::MMIODeviceInfo;
 use crate::devices::acpi::vmgenid::VmGenId;
 use crate::initrd::InitrdConfig;
+use crate::vmm_config::machine_config::MachineConfig;
 use crate::vstate::memory::{Address, Bytes, GuestAddress, GuestMemory, GuestMemoryMmap};
+use crate::vstate::vcpu::KvmVcpuError;
+use crate::{Vcpu, VcpuConfig, Vmm};
 
 /// Errors thrown while configuring aarch64 system.
 #[derive(Debug, thiserror::Error, displaydoc::Display)]
@@ -44,6 +51,14 @@ pub enum ConfigurationError {
     KernelFile,
     /// Cannot load kernel due to invalid memory configuration or invalid kernel image: {0}
     KernelLoader(linux_loader::loader::Error),
+    /// Error initializing the vcpu: {0}
+    VcpuInit(KvmVcpuError),
+    /// Error configuring the vcpu: {0}
+    VcpuConfigure(KvmVcpuError),
+    /// Error reading vcpu registers: {0}
+    VcpuGetRegs(VcpuArchError),
+    /// Error applying vcpu template: {0}
+    VcpuApplyTemplate(CpuConfigurationError),
 }
 
 /// The start of the memory area reserved for MMIO devices.
@@ -58,18 +73,73 @@ pub fn arch_memory_regions(size: usize) -> Vec<(GuestAddress, usize)> {
     vec![(GuestAddress(layout::DRAM_MEM_START), dram_size)]
 }
 
+/// Configures the system for booting Linux.
+pub fn configure_system_for_boot(
+    vmm: &mut Vmm,
+    vcpus: &mut [Vcpu],
+    machine_config: &MachineConfig,
+    cpu_template: &CustomCpuTemplate,
+    entry_point: EntryPoint,
+    initrd: &Option<InitrdConfig>,
+    boot_cmdline: Cmdline,
+) -> Result<(), ConfigurationError> {
+    // Construct the base CpuConfiguration to apply CPU template onto.
+    let cpu_config = {
+        for vcpu in vcpus.iter_mut() {
+            vcpu.kvm_vcpu
+                .init(&cpu_template.vcpu_features)
+                .map_err(ConfigurationError::VcpuInit)?;
+        }
+
+        let mut regs = Aarch64RegisterVec::default();
+        get_registers(&vcpus[0].kvm_vcpu.fd, &cpu_template.reg_list(), &mut regs)
+            .map_err(ConfigurationError::VcpuGetRegs)?;
+        CpuConfiguration { regs }
+    };
+
+    // Apply CPU template to the base CpuConfiguration.
+    let cpu_config = CpuConfiguration::apply_template(cpu_config, cpu_template)
+        .map_err(ConfigurationError::VcpuApplyTemplate)?;
+
+    let vcpu_config = VcpuConfig {
+        vcpu_count: machine_config.vcpu_count,
+        smt: machine_config.smt,
+        cpu_config,
+    };
+
+    let optional_capabilities = vmm.kvm.optional_capabilities();
+    // Configure vCPUs with normalizing and setting the generated CPU configuration.
+    for vcpu in vcpus.iter_mut() {
+        vcpu.kvm_vcpu
+            .configure(
+                vmm.guest_memory(),
+                entry_point,
+                &vcpu_config,
+                &optional_capabilities,
+            )
+            .map_err(ConfigurationError::VcpuConfigure)?;
+    }
+    let vcpu_mpidr = vcpus
+        .iter_mut()
+        .map(|cpu| cpu.kvm_vcpu.get_mpidr())
+        .collect();
+    let cmdline = boot_cmdline
+        .as_cstring()
+        .expect("Cannot create cstring from cmdline string");
+    configure_system(
+        &vmm.guest_memory,
+        cmdline,
+        vcpu_mpidr,
+        vmm.mmio_device_manager.get_device_info(),
+        vmm.vm.get_irqchip(),
+        &vmm.acpi_device_manager.vmgenid,
+        initrd,
+    )?;
+    Ok(())
+}
+
 /// Configures the system and should be called once per vm before starting vcpu threads.
-/// For aarch64, we only setup the FDT.
-///
-/// # Arguments
-///
-/// * `guest_mem` - The memory to be used by the guest.
-/// * `cmdline_cstring` - The kernel commandline.
-/// * `vcpu_mpidr` - Array of MPIDR register values per vcpu.
-/// * `device_info` - A hashmap containing the attached devices for building FDT device nodes.
-/// * `gic_device` - The GIC device.
-/// * `initrd` - Information about an optional initrd.
-pub fn configure_system(
+fn configure_system(
     guest_mem: &GuestMemoryMmap,
     cmdline_cstring: CString,
     vcpu_mpidr: Vec<u64>,

src/vmm/src/arch/mod.rs

@@ -20,9 +20,10 @@ pub use aarch64::vcpu::*;
 pub use aarch64::vm::{ArchVm, ArchVmError, VmState};
 #[cfg(target_arch = "aarch64")]
 pub use aarch64::{
-    ConfigurationError, MMIO_MEM_SIZE, MMIO_MEM_START, arch_memory_regions, configure_system,
-    get_kernel_start, initrd_load_addr, layout::CMDLINE_MAX_SIZE, layout::IRQ_BASE,
-    layout::IRQ_MAX, layout::SYSTEM_MEM_SIZE, layout::SYSTEM_MEM_START, load_kernel,
+    ConfigurationError, MMIO_MEM_SIZE, MMIO_MEM_START, arch_memory_regions,
+    configure_system_for_boot, get_kernel_start, initrd_load_addr, layout::CMDLINE_MAX_SIZE,
+    layout::IRQ_BASE, layout::IRQ_MAX, layout::SYSTEM_MEM_SIZE, layout::SYSTEM_MEM_START,
+    load_kernel,
 };
 
 /// Module for x86_64 related functionality.
@@ -35,12 +36,13 @@ pub use x86_64::kvm::{Kvm, KvmArchError};
 pub use x86_64::vcpu::*;
 #[cfg(target_arch = "x86_64")]
 pub use x86_64::vm::{ArchVm, ArchVmError, VmState};
+
 #[cfg(target_arch = "x86_64")]
-pub use x86_64::{
-    ConfigurationError, MMIO_MEM_SIZE, MMIO_MEM_START, arch_memory_regions, configure_system,
-    get_kernel_start, initrd_load_addr, layout::APIC_ADDR, layout::CMDLINE_MAX_SIZE,
-    layout::IOAPIC_ADDR, layout::IRQ_BASE, layout::IRQ_MAX, layout::SYSTEM_MEM_SIZE,
-    layout::SYSTEM_MEM_START, load_kernel,
+pub use crate::arch::x86_64::{
+    ConfigurationError, MMIO_MEM_SIZE, MMIO_MEM_START, arch_memory_regions,
+    configure_system_for_boot, get_kernel_start, initrd_load_addr, layout::APIC_ADDR,
+    layout::CMDLINE_MAX_SIZE, layout::IOAPIC_ADDR, layout::IRQ_BASE, layout::IRQ_MAX,
+    layout::SYSTEM_MEM_SIZE, layout::SYSTEM_MEM_START, load_kernel,
 };
 
 /// Types of devices that can get attached to this platform.

src/vmm/src/arch/x86_64/mod.rs

@@ -41,17 +41,23 @@ use linux_loader::loader::elf::Elf as Loader;
 use linux_loader::loader::elf::start_info::{
     hvm_memmap_table_entry, hvm_modlist_entry, hvm_start_info,
 };
-use linux_loader::loader::{KernelLoader, PvhBootCapability};
+use linux_loader::loader::{Cmdline, KernelLoader, PvhBootCapability, load_cmdline};
 use log::debug;
 
 use super::EntryPoint;
+use crate::acpi::create_acpi_tables;
 use crate::arch::{BootProtocol, SYSTEM_MEM_SIZE, SYSTEM_MEM_START};
+use crate::cpu_config::templates::{CustomCpuTemplate, GuestConfigError};
+use crate::cpu_config::x86_64::{CpuConfiguration, cpuid};
 use crate::device_manager::resources::ResourceAllocator;
 use crate::initrd::InitrdConfig;
 use crate::utils::{mib_to_bytes, u64_to_usize};
+use crate::vmm_config::machine_config::MachineConfig;
 use crate::vstate::memory::{
     Address, GuestAddress, GuestMemory, GuestMemoryMmap, GuestMemoryRegion,
 };
+use crate::vstate::vcpu::KvmVcpuConfigureError;
+use crate::{Vcpu, VcpuConfig, Vmm};
 
 // Value taken from https://elixir.bootlin.com/linux/v5.10.68/source/arch/x86/include/uapi/asm/e820.h#L31
 // Usable normal RAM
@@ -62,7 +68,7 @@ const E820_RESERVED: u32 = 2;
 const MEMMAP_TYPE_RAM: u32 = 1;
 
 /// Errors thrown while configuring x86_64 system.
-#[derive(Debug, PartialEq, Eq, thiserror::Error, displaydoc::Display)]
+#[derive(Debug, thiserror::Error, displaydoc::Display)]
 pub enum ConfigurationError {
     /// Invalid e820 setup params.
     E820Configuration,
@@ -80,6 +86,14 @@ pub enum ConfigurationError {
     KernelFile,
     /// Cannot load kernel due to invalid memory configuration or invalid kernel image: {0}
     KernelLoader(linux_loader::loader::Error),
+    /// Failed to create guest config: {0}
+    CreateGuestConfig(#[from] GuestConfigError),
+    /// Error configuring the vcpu for boot: {0}
+    VcpuConfigure(KvmVcpuConfigureError),
+    /// Cannot load command line string: {0}
+    LoadCommandline(linux_loader::loader::Error),
+    /// Error configuring ACPI: {0}
+    Acpi(#[from] crate::acpi::AcpiError),
 }
 
 /// First address that cannot be addressed using 32 bit anymore.
@@ -130,17 +144,81 @@ pub fn initrd_load_addr(guest_mem: &GuestMemoryMmap, initrd_size: usize) -> Opti
     Some(align_to_pagesize(lowmem_size - initrd_size) as u64)
 }
 
+/// Configures the system for booting Linux.
+pub fn configure_system_for_boot(
+    vmm: &mut Vmm,
+    vcpus: &mut [Vcpu],
+    machine_config: &MachineConfig,
+    cpu_template: &CustomCpuTemplate,
+    entry_point: EntryPoint,
+    initrd: &Option<InitrdConfig>,
+    boot_cmdline: Cmdline,
+) -> Result<(), ConfigurationError> {
+    // Construct the base CpuConfiguration to apply CPU template onto.
+    let cpu_config = {
+        let cpuid = cpuid::Cpuid::try_from(vmm.kvm.supported_cpuid.clone())
+            .map_err(GuestConfigError::CpuidFromKvmCpuid)?;
+        let msrs = vcpus[0]
+            .kvm_vcpu
+            .get_msrs(cpu_template.msr_index_iter())
+            .map_err(GuestConfigError::VcpuIoctl)?;
+        CpuConfiguration { cpuid, msrs }
+    };
+
+    // Apply CPU template to the base CpuConfiguration.
+    let cpu_config = CpuConfiguration::apply_template(cpu_config, cpu_template)?;
+
+    let vcpu_config = VcpuConfig {
+        vcpu_count: machine_config.vcpu_count,
+        smt: machine_config.smt,
+        cpu_config,
+    };
+
+    // Configure vCPUs with normalizing and setting the generated CPU configuration.
+    for vcpu in vcpus.iter_mut() {
+        vcpu.kvm_vcpu
+            .configure(vmm.guest_memory(), entry_point, &vcpu_config)
+            .map_err(ConfigurationError::VcpuConfigure)?;
+    }
+
+    // Write the kernel command line to guest memory. This is x86_64 specific, since on
+    // aarch64 the command line will be specified through the FDT.
+    let cmdline_size = boot_cmdline
+        .as_cstring()
+        .map(|cmdline_cstring| cmdline_cstring.as_bytes_with_nul().len())
+        .expect("Cannot create cstring from cmdline string");
+
+    load_cmdline::<GuestMemoryMmap>(
+        vmm.guest_memory(),
+        GuestAddress(crate::arch::x86_64::layout::CMDLINE_START),
+        &boot_cmdline,
+    )
+    .map_err(ConfigurationError::LoadCommandline)?;
+    configure_system(
+        &vmm.guest_memory,
+        &mut vmm.resource_allocator,
+        GuestAddress(crate::arch::x86_64::layout::CMDLINE_START),
+        cmdline_size,
+        initrd,
+        vcpu_config.vcpu_count,
+        entry_point.protocol,
+    )?;
+
+    // Create ACPI tables and write them in guest memory
+    // For the time being we only support ACPI in x86_64
+    create_acpi_tables(
+        &vmm.guest_memory,
+        &mut vmm.resource_allocator,
+        &vmm.mmio_device_manager,
+        &vmm.acpi_device_manager,
+        vcpus,
+    )
+    .map_err(ConfigurationError::Acpi)?;
+    Ok(())
+}
+
 /// Configures the system and should be called once per vm before starting vcpu threads.
-///
-/// # Arguments
-///
-/// * `guest_mem` - The memory to be used by the guest.
-/// * `cmdline_addr` - Address in `guest_mem` where the kernel command line was loaded.
-/// * `cmdline_size` - Size of the kernel command line in bytes including the null terminator.
-/// * `initrd` - Information about where the ramdisk image was loaded in the `guest_mem`.
-/// * `num_cpus` - Number of virtual CPUs the guest will have.
-/// * `boot_prot` - Boot protocol that will be used to boot the guest.
-pub fn configure_system(
+fn configure_system(
     guest_mem: &GuestMemoryMmap,
     resource_allocator: &mut ResourceAllocator,
     cmdline_addr: GuestAddress,
@@ -438,10 +516,10 @@ mod tests {
             1,
             BootProtocol::LinuxBoot,
         );
-        assert_eq!(
+        assert!(matches!(
             config_err.unwrap_err(),
             super::ConfigurationError::MpTableSetup(mptable::MptableError::NotEnoughMemory)
-        );
+        ));
 
         // Now assigning some memory that falls before the 32bit memory hole.
         let mem_size = mib_to_bytes(128);