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vmm: Add support for booting raw binary (e.g. firmware) on x86-64

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If the provided binary isn't an ELF binary assume that it is a firmware
to be loaded in directly. In this case we shouldn't program any of the
registers as KVM starts in that state.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford
2021-11-29 16:44:32 +00:00
committed by Sebastien Boeuf
parent bc827ee3be
commit 82d06c0efa
2 changed files with 59 additions and 13 deletions
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13
arch/src/x86_64/mod.rs
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@@ -57,7 +57,7 @@ const KVM_FEATURE_STEAL_TIME_BIT: u8 = 5;
/// is to be used to configure the guest initial state.
pub struct EntryPoint {
/// Address in guest memory where the guest must start execution
pub entry_addr: GuestAddress,
pub entry_addr: Option<GuestAddress>,
}
const E820_RAM: u32 = 1;
@@ -741,11 +741,12 @@ pub fn configure_vcpu(
regs::setup_msrs(fd).map_err(Error::MsrsConfiguration)?;
if let Some(kernel_entry_point) = kernel_entry_point {
// Safe to unwrap because this method is called after the VM is configured
regs::setup_regs(fd, kernel_entry_point.entry_addr.raw_value())
.map_err(Error::RegsConfiguration)?;
regs::setup_fpu(fd).map_err(Error::FpuConfiguration)?;
regs::setup_sregs(&vm_memory.memory(), fd).map_err(Error::SregsConfiguration)?;
if let Some(entry_addr) = kernel_entry_point.entry_addr {
// Safe to unwrap because this method is called after the VM is configured
regs::setup_regs(fd, entry_addr.raw_value()).map_err(Error::RegsConfiguration)?;
regs::setup_fpu(fd).map_err(Error::FpuConfiguration)?;
regs::setup_sregs(&vm_memory.memory(), fd).map_err(Error::SregsConfiguration)?;
}
}
interrupts::set_lint(fd).map_err(|e| Error::LocalIntConfiguration(e.into()))?;
Ok(())