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vmm: Use the full host physical address range

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Probe for the size of the host physical address range and use that to
establish the address range for the VM. This removes the limitation on
the size of the VM RAM and gives more space for the devices.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2019-09-18 15:36:14 +01:00
parent 180e6d1e78
commit 5b3ca78dac
1 changed files with 16 additions and 2 deletions
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18
vmm/src/vm.rs
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@ -518,6 +518,20 @@ pub struct Vm<'a> {
signals: Option<Signals>,
}
fn get_host_cpu_phys_bits() -> u8 {
use core::arch::x86_64;
unsafe {
let leaf = x86_64::__cpuid(0x8000_0000);
if leaf.eax >= 0x8000_0008 {
let leaf = x86_64::__cpuid(0x8000_0008);
(leaf.eax & 0xff) as u8
} else {
36
}
}
}
impl<'a> Vm<'a> {
pub fn new(kvm: &Kvm, config: &'a VmConfig<'a>) -> Result<Self> {
let kernel = File::open(&config.kernel.path).map_err(Error::KernelFile)?;
@ -676,7 +690,7 @@ impl<'a> Vm<'a> {
GuestAddress(0),
1 << 16 as GuestUsize,
GuestAddress(0),
1 << 36 as GuestUsize,
1 << get_host_cpu_phys_bits(),
mem_hole.0,
mem_hole.1 as GuestUsize,
vec![ioapic],
@ -787,7 +801,7 @@ impl<'a> Vm<'a> {
.map_err(|_| Error::CmdLine)?;
let vcpu_count = u8::from(&self.config.cpus);
let end_of_range = GuestAddress((1 << 36) - 1);
let end_of_range = GuestAddress((1 << get_host_cpu_phys_bits()) - 1);
match entry_addr.setup_header {
Some(hdr) => {
arch::configure_system(