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vmm: cpu: Support only partially configuring the vCPU

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When configuring a processor after boot as a hotplug CPU we only
configure a subset of the CPU state. In particular we should not
configure the FPU, segment registers (or reconfigure the paging which is
a side-effect of that) nor the main registers. Achieve this by making
the function take an Option type for the start address.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2019-11-27 17:18:10 +00:00
parent c8b3041e62
commit 0ef999978c
1 changed files with 15 additions and 13 deletions
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28
vmm/src/cpu.rs
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@ -245,7 +245,7 @@ impl Vcpu {
/// * `vm` - The virtual machine this vcpu will get attached to.
pub fn configure(
&mut self,
kernel_start_addr: GuestAddress,
kernel_start_addr: Option<GuestAddress>,
vm_memory: &Arc<RwLock<GuestMemoryMmap>>,
cpuid: CpuId,
) -> Result<()> {
@ -256,17 +256,19 @@ impl Vcpu {
.map_err(Error::SetSupportedCpusFailed)?;
arch::x86_64::regs::setup_msrs(&self.fd).map_err(Error::MSRSConfiguration)?;
// Safe to unwrap because this method is called after the VM is configured
arch::x86_64::regs::setup_regs(
&self.fd,
kernel_start_addr.raw_value(),
arch::x86_64::layout::BOOT_STACK_POINTER.raw_value(),
arch::x86_64::layout::ZERO_PAGE_START.raw_value(),
)
.map_err(Error::REGSConfiguration)?;
arch::x86_64::regs::setup_fpu(&self.fd).map_err(Error::FPUConfiguration)?;
arch::x86_64::regs::setup_sregs(&vm_memory.read().unwrap(), &self.fd)
.map_err(Error::SREGSConfiguration)?;
if let Some(kernel_start_addr) = kernel_start_addr {
// Safe to unwrap because this method is called after the VM is configured
arch::x86_64::regs::setup_regs(
&self.fd,
kernel_start_addr.raw_value(),
arch::x86_64::layout::BOOT_STACK_POINTER.raw_value(),
arch::x86_64::layout::ZERO_PAGE_START.raw_value(),
)
.map_err(Error::REGSConfiguration)?;
arch::x86_64::regs::setup_fpu(&self.fd).map_err(Error::FPUConfiguration)?;
arch::x86_64::regs::setup_sregs(&vm_memory.read().unwrap(), &self.fd)
.map_err(Error::SREGSConfiguration)?;
}
arch::x86_64::interrupts::set_lint(&self.fd).map_err(Error::LocalIntConfiguration)?;
Ok(())
}
@ -496,7 +498,7 @@ impl CpuManager {
ioapic,
creation_ts,
)?;
vcpu.configure(entry_addr, &self.vm_memory, self.cpuid.clone())?;
vcpu.configure(Some(entry_addr), &self.vm_memory, self.cpuid.clone())?;
let vcpu_thread_barrier = vcpu_thread_barrier.clone();