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arch: x86_64: enable nested virtualization on amd if supported

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When using amd topology, the svm feature flag on cpuid leaf
0x8000_0001.ecx is overwritten. We update the amd cpu topology
logic to use the flag values that originated in
KVM_GET_SUPPORTED_CPUID ioctl and override as necessary.

Signed-off-by: Thomas Barrett <tbarrett@crusoeenergy.com>
This commit is contained in:
Thomas Barrett 2024-01-14 23:40:00 +00:00 committed by Rob Bradford
parent 34e965d775
commit 7bc764d4e0
1 changed files with 23 additions and 1 deletions
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24
arch/src/x86_64/mod.rs
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@ -263,6 +263,26 @@ pub struct CpuidPatch {
}
impl CpuidPatch {
pub fn get_cpuid_reg(
cpuid: &[CpuIdEntry],
function: u32,
index: Option<u32>,
reg: CpuidReg,
) -> Option<u32> {
for entry in cpuid.iter() {
if entry.function == function && (index.is_none() || index.unwrap() == entry.index) {
return match reg {
CpuidReg::EAX => Some(entry.eax),
CpuidReg::EBX => Some(entry.ebx),
CpuidReg::ECX => Some(entry.ecx),
CpuidReg::EDX => Some(entry.edx),
};
}
}
None
}
pub fn set_cpuid_reg(
cpuid: &mut Vec<CpuIdEntry>,
function: u32,
@ -1326,12 +1346,14 @@ fn update_cpuid_topology(
);
CpuidPatch::set_cpuid_reg(cpuid, 0x8000_001e, Some(0), CpuidReg::EDX, 0);
if cores_per_die * threads_per_core > 1 {
let ecx =
CpuidPatch::get_cpuid_reg(cpuid, 0x8000_0001, Some(0), CpuidReg::ECX).unwrap_or(0);
CpuidPatch::set_cpuid_reg(
cpuid,
0x8000_0001,
Some(0),
CpuidReg::ECX,
(1u32 << 1) | (1u32 << 22),
ecx | (1u32 << 1) | (1u32 << 22),
);
CpuidPatch::set_cpuid_reg(
cpuid,