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arch: Print details of host hypervisor status & address space size

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e.g. on QEMU on KVM:

cloud-hypervisor: 17.079406ms: <vmm> INFO:arch/src/x86_64/mod.rs:565 -- Running under nested virtualisation. Hypervisor string: KVMKVMKVM

Or under Azure:

cloud-hypervisor: 3.881263ms: <vmm> INFO:arch/src/x86_64/mod.rs:565 -- Running under nested virtualisation. Hypervisor string: Microsoft Hv

Fixes: #5067

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2023-01-11 11:37:19 +00:00
parent c99a5fc7a5
commit e661139e1e
1 changed files with 17 additions and 0 deletions
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17
arch/src/x86_64/mod.rs
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@ -554,6 +554,23 @@ pub fn generate_common_cpuid(
kvm_hyperv: bool,
#[cfg(feature = "tdx")] tdx_enabled: bool,
) -> super::Result<Vec<CpuIdEntry>> {
// SAFETY: cpuid called with valid leaves
if unsafe { x86_64::__cpuid(1) }.ecx & 1 << HYPERVISOR_ECX_BIT == 1 << HYPERVISOR_ECX_BIT {
// SAFETY: cpuid called with valid leaves
let hypervisor_cpuid = unsafe { x86_64::__cpuid(0x4000_0000) };
let mut identifier: [u8; 12] = [0; 12];
identifier[0..4].copy_from_slice(&hypervisor_cpuid.ebx.to_le_bytes()[..]);
identifier[4..8].copy_from_slice(&hypervisor_cpuid.ecx.to_le_bytes()[..]);
identifier[8..12].copy_from_slice(&hypervisor_cpuid.edx.to_le_bytes()[..]);
info!(
"Running under nested virtualisation. Hypervisor string: {}",
String::from_utf8_lossy(&identifier)
);
}
info!("Generating guest CPUID for with physical address size: {phys_bits}");
let cpuid_patches = vec![
// Patch tsc deadline timer bit
CpuidPatch {