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arch, vmm: Add new struct CpuidConfig

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This struct contains all configuration fields that controls the way how
we generate CPUID for the guest on x86_64. This allows cleaner extension
when adding new configuration fields.

Signed-off-by: Bo Chen <chen.bo@intel.com>
This commit is contained in:
Bo Chen
2023-10-11 11:52:24 -07:00
committed by Bo Chen
parent 30975ea102
commit 7dd260f82f
5 changed files with 50 additions and 34 deletions
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2
arch/src/lib.rs
View File

@@ -92,7 +92,7 @@ pub mod x86_64;
pub use x86_64::{
arch_memory_regions, configure_system, configure_vcpu, generate_common_cpuid,
get_host_cpu_phys_bits, initramfs_load_addr, layout, layout::CMDLINE_MAX_SIZE,
layout::CMDLINE_START, regs, CpuidFeatureEntry, EntryPoint, _NSIG,
layout::CMDLINE_START, regs, CpuidConfig, CpuidFeatureEntry, EntryPoint, _NSIG,
};
/// Safe wrapper for `sysconf(_SC_PAGESIZE)`.

30
arch/src/x86_64/mod.rs
View File

@@ -145,6 +145,14 @@ struct BootParamsWrapper(boot_params);
// SAFETY: BootParamsWrap is a wrapper over `boot_params` (a series of ints).
unsafe impl ByteValued for BootParamsWrapper {}
pub struct CpuidConfig {
pub sgx_epc_sections: Option<Vec<SgxEpcSection>>,
pub phys_bits: u8,
pub kvm_hyperv: bool,
#[cfg(feature = "tdx")]
pub tdx: bool,
}
#[derive(Debug)]
pub enum Error {
/// Error writing MP table to memory.
@@ -552,10 +560,7 @@ impl CpuidFeatureEntry {
pub fn generate_common_cpuid(
hypervisor: &Arc<dyn hypervisor::Hypervisor>,
sgx_epc_sections: Option<Vec<SgxEpcSection>>,
phys_bits: u8,
kvm_hyperv: bool,
#[cfg(feature = "tdx")] tdx_enabled: bool,
config: &CpuidConfig,
) -> 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 {
@@ -573,7 +578,10 @@ pub fn generate_common_cpuid(
);
}
info!("Generating guest CPUID for with physical address size: {phys_bits}");
info!(
"Generating guest CPUID for with physical address size: {}",
config.phys_bits
);
let cpuid_patches = vec![
// Patch tsc deadline timer bit
CpuidPatch {
@@ -614,12 +622,12 @@ pub fn generate_common_cpuid(
CpuidPatch::patch_cpuid(&mut cpuid, cpuid_patches);
if let Some(sgx_epc_sections) = sgx_epc_sections {
if let Some(sgx_epc_sections) = &config.sgx_epc_sections {
update_cpuid_sgx(&mut cpuid, sgx_epc_sections)?;
}
#[cfg(feature = "tdx")]
let tdx_capabilities = if tdx_enabled {
let tdx_capabilities = if config.tdx {
let caps = hypervisor
.tdx_capabilities()
.map_err(Error::TdxCapabilities)?;
@@ -667,12 +675,12 @@ pub fn generate_common_cpuid(
}
// Set CPU physical bits
0x8000_0008 => {
entry.eax = (entry.eax & 0xffff_ff00) | (phys_bits as u32 & 0xff);
entry.eax = (entry.eax & 0xffff_ff00) | (config.phys_bits as u32 & 0xff);
}
0x4000_0001 => {
// These features are not supported by TDX
#[cfg(feature = "tdx")]
if tdx_enabled {
if config.tdx {
entry.eax &= !(1 << KVM_FEATURE_CLOCKSOURCE_BIT
| 1 << KVM_FEATURE_CLOCKSOURCE2_BIT
| 1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT
@@ -700,7 +708,7 @@ pub fn generate_common_cpuid(
});
}
if kvm_hyperv {
if config.kvm_hyperv {
// Remove conflicting entries
cpuid.retain(|c| c.function != 0x4000_0000);
cpuid.retain(|c| c.function != 0x4000_0001);
@@ -1293,7 +1301,7 @@ fn update_cpuid_topology(
// sections exposed to the guest.
fn update_cpuid_sgx(
cpuid: &mut Vec<CpuIdEntry>,
epc_sections: Vec<SgxEpcSection>,
epc_sections: &Vec<SgxEpcSection>,
) -> Result<(), Error> {
// Something's wrong if there's no EPC section.
if epc_sections.is_empty() {