cloud-hypervisor: Initial kernel booting implementation

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2024-12-22 05:35:20 +00:00 · 2019-02-28 14:16:58 +01:00 · 2019-02-28 14:16:58 +01:00 · 539367b58c
commit 539367b58c
parent b56b4ca834
5 changed files with 327 additions and 101 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@ -3,6 +3,22 @@ name = "ansi_term"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"

+[[package]]
+name = "arch"
+version = "0.1.0"
+dependencies = [
+ "arch_gen 0.1.0",
+ "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kvm-bindings 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kvm-ioctls 0.1.0 (git+https://github.com/rust-vmm/kvm-ioctls)",
+ "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vm-memory 0.1.0 (git+https://github.com/rust-vmm/vm-memory)",
+]
+
+[[package]]
+name = "arch_gen"
+version = "0.1.0"
+
 [[package]]
 name = "atty"
 version = "0.2.11"
@ -18,6 +34,11 @@ name = "bitflags"
 version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"

+[[package]]
+name = "byteorder"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "clap"
 version = "2.27.1"
@ -59,6 +80,14 @@ name = "libc"
 version = "0.2.48"
 source = "registry+https://github.com/rust-lang/crates.io-index"

+[[package]]
+name = "linux-loader"
+version = "0.1.0"
+source = "git+https://github.com/sameo/linux-loader#f0905480bd9f9aae8b88c63ca5dd6f3469483b65"
+dependencies = [
+ "vm-memory 0.1.0 (git+https://github.com/rust-vmm/vm-memory)",
+]
+
 [[package]]
 name = "redox_syscall"
 version = "0.1.51"
@ -117,8 +146,10 @@ dependencies = [
 name = "vmm"
 version = "0.1.0"
 dependencies = [
+ "arch 0.1.0",
 "kvm-bindings 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "kvm-ioctls 0.1.0 (git+https://github.com/rust-vmm/kvm-ioctls)",
+ "linux-loader 0.1.0 (git+https://github.com/sameo/linux-loader)",
 "vm-memory 0.1.0 (git+https://github.com/rust-vmm/vm-memory)",
 ]

@ -145,10 +176,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum ansi_term 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "23ac7c30002a5accbf7e8987d0632fa6de155b7c3d39d0067317a391e00a2ef6"
 "checksum atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "9a7d5b8723950951411ee34d271d99dddcc2035a16ab25310ea2c8cfd4369652"
 "checksum bitflags 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4efd02e230a02e18f92fc2735f44597385ed02ad8f831e7c1c1156ee5e1ab3a5"
+"checksum byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "652805b7e73fada9d85e9a6682a4abd490cb52d96aeecc12e33a0de34dfd0d23"
 "checksum clap 2.27.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1b8c532887f1a292d17de05ae858a8fe50a301e196f9ef0ddb7ccd0d1d00f180"
 "checksum kvm-bindings 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c223e8703d2eb76d990c5f58e29c85b0f6f50e24b823babde927948e7c71fc03"
 "checksum kvm-ioctls 0.1.0 (git+https://github.com/rust-vmm/kvm-ioctls)" = "<none>"
 "checksum libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)" = "e962c7641008ac010fa60a7dfdc1712449f29c44ef2d4702394aea943ee75047"
+"checksum linux-loader 0.1.0 (git+https://github.com/sameo/linux-loader)" = "<none>"
 "checksum redox_syscall 0.1.51 (registry+https://github.com/rust-lang/crates.io-index)" = "423e376fffca3dfa06c9e9790a9ccd282fafb3cc6e6397d01dbf64f9bacc6b85"
 "checksum redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7e891cfe48e9100a70a3b6eb652fef28920c117d366339687bd5576160db0f76"
 "checksum strsim 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b4d15c810519a91cf877e7e36e63fe068815c678181439f2f29e2562147c3694"
--- a/src/main.rs
+++ b/src/main.rs
@ -32,5 +32,5 @@ fn main() {

    println!("Booting {:?}...", kernel_path.as_path());

-    vmm::test_vm()
+    vmm::boot_kernel(kernel_path.as_path()).unwrap();
 }
--- a/vmm/Cargo.toml
+++ b/vmm/Cargo.toml
@ -5,8 +5,10 @@ authors = ["The Cloud Hypervisor Authors"]
 edition = "2018"

 [dependencies]
+arch = { path = "../arch" }
 kvm-bindings = "0.1"
 kvm-ioctls = { git = "https://github.com/rust-vmm/kvm-ioctls" }
+linux-loader = { git = "https://github.com/sameo/linux-loader" }

 [dependencies.vm-memory]
 git = "https://github.com/rust-vmm/vm-memory"
--- a/vmm/src/lib.rs
+++ b/vmm/src/lib.rs
@ -4,110 +4,30 @@
 //

 extern crate kvm_ioctls;
-extern crate vm_memory;

-use kvm_bindings::kvm_userspace_memory_region;
 use kvm_ioctls::*;
-use std::str;
-use vm_memory::{Address, Bytes, GuestAddress, GuestMemory, GuestMemoryMmap, GuestMemoryRegion};
+use std::path::Path;
+pub mod vm;

-pub fn test_vm() {
-    // This example based on https://lwn.net/Articles/658511/
-    let code = [
-        0xba, 0xf8, 0x03, /* mov $0x3f8, %dx */
-        0x00, 0xd8, /* add %bl, %al */
-        0x04, b'0', /* add $'0', %al */
-        0xee, /* out %al, (%dx) */
-        0xb0, b'\n', /* mov $'\n', %al */
-        0xee,  /* out %al, (%dx) */
-        0xf4,  /* hlt */
-    ];
+use self::vm::{Result, Vm};

-    let mem_size = 0x1000;
-    let load_addr = GuestAddress(0x1000);
-    let mem = GuestMemoryMmap::new(&[(load_addr, mem_size)]).unwrap();
+struct Vmm {
+    kvm: Kvm,
+}

-    let kvm = Kvm::new().expect("new KVM instance creation failed");
-    let vm_fd = kvm.create_vm().expect("new VM fd creation failed");
-
-    mem.with_regions(|index, region| {
-        let mem_region = kvm_userspace_memory_region {
-            slot: index as u32,
-            guest_phys_addr: region.start_addr().raw_value(),
-            memory_size: region.len() as u64,
-            userspace_addr: region.as_ptr() as u64,
-            flags: 0,
-        };
-
-        // Safe because the guest regions are guaranteed not to overlap.
-        vm_fd.set_user_memory_region(mem_region)
-    })
-    .expect("Cannot configure guest memory");
-
-    mem.write_slice(&code, load_addr)
-        .expect("Writing code to memory failed");
-
-    let vcpu_fd = vm_fd.create_vcpu(0).expect("new VcpuFd failed");
-
-    let mut vcpu_sregs = vcpu_fd.get_sregs().expect("get sregs failed");
-    vcpu_sregs.cs.base = 0;
-    vcpu_sregs.cs.selector = 0;
-    vcpu_fd.set_sregs(&vcpu_sregs).expect("set sregs failed");
-
-    let mut vcpu_regs = vcpu_fd.get_regs().expect("get regs failed");
-    vcpu_regs.rip = 0x1000;
-    vcpu_regs.rax = 2;
-    vcpu_regs.rbx = 3;
-    vcpu_regs.rflags = 2;
-    vcpu_fd.set_regs(&vcpu_regs).expect("set regs failed");
-
-    loop {
-        match vcpu_fd.run().expect("run failed") {
-            VcpuExit::IoIn(addr, data) => {
-                println!(
-                    "IO in -- addr: {:#x} data [{:?}]",
-                    addr,
-                    str::from_utf8(&data).unwrap()
-                );
-            }
-            VcpuExit::IoOut(addr, data) => {
-                println!(
-                    "IO out -- addr: {:#x} data [{:?}]",
-                    addr,
-                    str::from_utf8(&data).unwrap()
-                );
-            }
-            VcpuExit::MmioRead(_addr, _data) => {}
-            VcpuExit::MmioWrite(_addr, _data) => {}
-            VcpuExit::Unknown => {}
-            VcpuExit::Exception => {}
-            VcpuExit::Hypercall => {}
-            VcpuExit::Debug => {}
-            VcpuExit::Hlt => {
-                println!("HLT");
-            }
-            VcpuExit::IrqWindowOpen => {}
-            VcpuExit::Shutdown => {}
-            VcpuExit::FailEntry => {}
-            VcpuExit::Intr => {}
-            VcpuExit::SetTpr => {}
-            VcpuExit::TprAccess => {}
-            VcpuExit::S390Sieic => {}
-            VcpuExit::S390Reset => {}
-            VcpuExit::Dcr => {}
-            VcpuExit::Nmi => {}
-            VcpuExit::InternalError => {}
-            VcpuExit::Osi => {}
-            VcpuExit::PaprHcall => {}
-            VcpuExit::S390Ucontrol => {}
-            VcpuExit::Watchdog => {}
-            VcpuExit::S390Tsch => {}
-            VcpuExit::Epr => {}
-            VcpuExit::SystemEvent => {}
-            VcpuExit::S390Stsi => {}
-            VcpuExit::IoapicEoi => {}
-            VcpuExit::Hyperv => {}
-        }
-        //        r => panic!("unexpected exit reason: {:?}", r),
+impl Vmm {
+    fn new() -> Result<Self> {
+        let kvm = Kvm::new().expect("new KVM instance creation failed");
+        Ok(Vmm { kvm })
    }
 }
+
+pub fn boot_kernel(kernel: &Path) -> Result<()> {
+    let vmm = Vmm::new()?;
+    let mut vm = Vm::new(&vmm.kvm, kernel)?;
+
+    vm.load_kernel()?;
+    vm.start()?;
+
+    Ok(())
+}
--- a/vmm/src/vm.rs
+++ b/vmm/src/vm.rs
@ -0,0 +1,271 @@
+// Copyright © 2019 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+extern crate arch;
+extern crate kvm_ioctls;
+extern crate linux_loader;
+extern crate vm_memory;
+
+use kvm_bindings::kvm_userspace_memory_region;
+use kvm_ioctls::*;
+use linux_loader::cmdline;
+use linux_loader::loader::KernelLoader;
+use std::ffi::CString;
+use std::fs::File;
+use std::path::Path;
+use std::{io, result, str, thread};
+use vm_memory::{
+    Address, Bytes, GuestAddress, GuestMemory, GuestMemoryMmap, GuestMemoryRegion, GuestUsize,
+    MmapError,
+};
+
+const DEFAULT_CMDLINE: &str =
+    "console=ttyS0,115200n8 init=/init tsc=reliable no_timer_check cryptomgr.notests";
+const CMDLINE_OFFSET: GuestAddress = GuestAddress(0x20000);
+
+/// Errors associated with the wrappers over KVM ioctls.
+#[derive(Debug)]
+pub enum Error {
+    /// Cannot open the VM file descriptor.
+    VmFd(io::Error),
+
+    /// Cannot create the KVM instance
+    VmCreate(io::Error),
+
+    /// Cannot set the VM up
+    VmSetup(io::Error),
+
+    /// Cannot open the kernel image
+    KernelFile(io::Error),
+
+    /// Mmap backed guest memory error
+    GuestMemory(MmapError),
+
+    /// Cannot load the kernel in memory
+    KernelLoad(linux_loader::loader::Error),
+
+    /// Cannot load the command line in memory
+    CmdLine,
+}
+pub type Result<T> = result::Result<T, Error>;
+
+struct VmConfig<'a> {
+    kernel_path: &'a Path,
+    cmdline: Option<cmdline::Cmdline>,
+    cmdline_addr: GuestAddress,
+
+    memory_size: GuestUsize,
+    vcpu_count: u8,
+}
+
+impl<'a> Default for VmConfig<'a> {
+    fn default() -> Self {
+        let line = String::from(DEFAULT_CMDLINE);
+        let mut cmdline = cmdline::Cmdline::new(line.capacity());
+        cmdline.insert_str(line);
+
+        VmConfig {
+            kernel_path: Path::new(""),
+            cmdline: Some(cmdline),
+            cmdline_addr: CMDLINE_OFFSET,
+            memory_size: 512,
+            vcpu_count: 1,
+        }
+    }
+}
+
+pub struct Vm<'a> {
+    fd: VmFd,
+    kernel: File,
+    memory: GuestMemoryMmap,
+    vcpus: Option<Vec<thread::JoinHandle<()>>>,
+    config: VmConfig<'a>,
+}
+
+impl<'a> Vm<'a> {
+    pub fn new(kvm: &Kvm, kernel_path: &'a Path) -> Result<Self> {
+        let vm_config = VmConfig {
+            kernel_path,
+            ..Default::default()
+        };
+
+        let kernel = File::open(kernel_path).map_err(Error::KernelFile)?;
+        let fd = kvm.create_vm().map_err(Error::VmCreate)?;
+
+        // Init guest memory
+        let arch_mem_regions = arch::arch_memory_regions(vm_config.memory_size << 20);
+        let guest_memory = GuestMemoryMmap::new(&arch_mem_regions).map_err(Error::GuestMemory)?;
+
+        guest_memory
+            .with_regions(|index, region| {
+                let mem_region = kvm_userspace_memory_region {
+                    slot: index as u32,
+                    guest_phys_addr: region.start_addr().raw_value(),
+                    memory_size: region.len() as u64,
+                    userspace_addr: region.as_ptr() as u64,
+                    flags: 0,
+                };
+
+                println!(
+                    "Size {:?} guest addr 0x{:x} host addr 0x{:x}",
+                    mem_region.memory_size, mem_region.guest_phys_addr, mem_region.userspace_addr
+                );
+
+                // Safe because the guest regions are guaranteed not to overlap.
+                fd.set_user_memory_region(mem_region)
+            })
+            .map_err(|_| Error::GuestMemory(MmapError::NoMemoryRegion))?;
+
+        // Set TSS
+        fd.set_tss_address(arch::x86_64::layout::KVM_TSS_ADDRESS.raw_value() as usize)
+            .map_err(Error::VmSetup)?;
+
+        Ok(Vm {
+            fd,
+            kernel,
+            memory: guest_memory,
+            vcpus: None,
+            config: vm_config,
+        })
+    }
+
+    pub fn load_kernel(&mut self) -> Result<GuestAddress> {
+        let cmdline = self.config.cmdline.clone().ok_or(Error::CmdLine)?;
+
+        let cmdline_cstring = CString::new(cmdline).map_err(|_| Error::CmdLine)?;
+
+        let entry_addr = linux_loader::loader::Elf::load(
+            &self.memory,
+            None,
+            &mut self.kernel,
+            Some(arch::HIMEM_START),
+        )
+        .map_err(Error::KernelLoad)?;
+
+        linux_loader::loader::load_cmdline(
+            &self.memory,
+            self.config.cmdline_addr,
+            &cmdline_cstring,
+        )
+        .map_err(|_| Error::CmdLine)?;
+
+        let vcpu_count = self.config.vcpu_count;
+
+        arch::configure_system(
+            &self.memory,
+            self.config.cmdline_addr,
+            cmdline_cstring.to_bytes().len() + 1,
+            vcpu_count,
+        )
+        .map_err(|_| Error::CmdLine)?;
+
+        Ok(entry_addr.kernel_load)
+    }
+
+    pub fn start(&mut self) -> Result<()> {
+        Ok(())
+    }
+}
+
+#[allow(unused)]
+pub fn test_vm() {
+    // This example based on https://lwn.net/Articles/658511/
+    let code = [
+        0xba, 0xf8, 0x03, /* mov $0x3f8, %dx */
+        0x00, 0xd8, /* add %bl, %al */
+        0x04, b'0', /* add $'0', %al */
+        0xee, /* out %al, (%dx) */
+        0xb0, b'\n', /* mov $'\n', %al */
+        0xee,  /* out %al, (%dx) */
+        0xf4,  /* hlt */
+    ];
+
+    let mem_size = 0x1000;
+    let load_addr = GuestAddress(0x1000);
+    let mem = GuestMemoryMmap::new(&[(load_addr, mem_size)]).unwrap();
+
+    let kvm = Kvm::new().expect("new KVM instance creation failed");
+    let vm_fd = kvm.create_vm().expect("new VM fd creation failed");
+
+    mem.with_regions(|index, region| {
+        let mem_region = kvm_userspace_memory_region {
+            slot: index as u32,
+            guest_phys_addr: region.start_addr().raw_value(),
+            memory_size: region.len() as u64,
+            userspace_addr: region.as_ptr() as u64,
+            flags: 0,
+        };
+
+        // Safe because the guest regions are guaranteed not to overlap.
+        vm_fd.set_user_memory_region(mem_region)
+    })
+    .expect("Cannot configure guest memory");
+    mem.write_slice(&code, load_addr)
+        .expect("Writing code to memory failed");
+
+    let vcpu_fd = vm_fd.create_vcpu(0).expect("new VcpuFd failed");
+
+    let mut vcpu_sregs = vcpu_fd.get_sregs().expect("get sregs failed");
+    vcpu_sregs.cs.base = 0;
+    vcpu_sregs.cs.selector = 0;
+    vcpu_fd.set_sregs(&vcpu_sregs).expect("set sregs failed");
+
+    let mut vcpu_regs = vcpu_fd.get_regs().expect("get regs failed");
+    vcpu_regs.rip = 0x1000;
+    vcpu_regs.rax = 2;
+    vcpu_regs.rbx = 3;
+    vcpu_regs.rflags = 2;
+    vcpu_fd.set_regs(&vcpu_regs).expect("set regs failed");
+
+    loop {
+        match vcpu_fd.run().expect("run failed") {
+            VcpuExit::IoIn(addr, data) => {
+                println!(
+                    "IO in -- addr: {:#x} data [{:?}]",
+                    addr,
+                    str::from_utf8(&data).unwrap()
+                );
+            }
+            VcpuExit::IoOut(addr, data) => {
+                println!(
+                    "IO out -- addr: {:#x} data [{:?}]",
+                    addr,
+                    str::from_utf8(&data).unwrap()
+                );
+            }
+            VcpuExit::MmioRead(_addr, _data) => {}
+            VcpuExit::MmioWrite(_addr, _data) => {}
+            VcpuExit::Unknown => {}
+            VcpuExit::Exception => {}
+            VcpuExit::Hypercall => {}
+            VcpuExit::Debug => {}
+            VcpuExit::Hlt => {
+                println!("HLT");
+            }
+            VcpuExit::IrqWindowOpen => {}
+            VcpuExit::Shutdown => {}
+            VcpuExit::FailEntry => {}
+            VcpuExit::Intr => {}
+            VcpuExit::SetTpr => {}
+            VcpuExit::TprAccess => {}
+            VcpuExit::S390Sieic => {}
+            VcpuExit::S390Reset => {}
+            VcpuExit::Dcr => {}
+            VcpuExit::Nmi => {}
+            VcpuExit::InternalError => {}
+            VcpuExit::Osi => {}
+            VcpuExit::PaprHcall => {}
+            VcpuExit::S390Ucontrol => {}
+            VcpuExit::Watchdog => {}
+            VcpuExit::S390Tsch => {}
+            VcpuExit::Epr => {}
+            VcpuExit::SystemEvent => {}
+            VcpuExit::S390Stsi => {}
+            VcpuExit::IoapicEoi => {}
+            VcpuExit::Hyperv => {}
+        }
+        //        r => panic!("unexpected exit reason: {:?}", r),
+    }
+}