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arch: x86_64: fall back to host cpuid l1 cache info if omitted by kvm

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If the KVM version is older than v6.6, KVM_GET_SUPPORTED_CPUID will omit
the L1 cache information in CPUID function 0x8000_0005. Fall back to
the host L1 cache information if it is omitted by KVM.

Signed-off-by: Sean Banko <sbanko@crusoe.ai>
This commit is contained in:
Sean Banko 2024-06-08 16:31:22 -07:00 committed by Rob Bradford
parent 42e9632c53
commit 2e50f5769f
1 changed files with 14 additions and 0 deletions
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14
arch/src/x86_64/mod.rs
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@ -702,6 +702,20 @@ pub fn generate_common_cpuid(
}
}
}
// Copy host L1 cache details if not populated by KVM
0x8000_0005 => {
if entry.eax == 0 && entry.ebx == 0 && entry.ecx == 0 && entry.edx == 0 {
// SAFETY: cpuid called with valid leaves
if unsafe { std::arch::x86_64::__cpuid(0x8000_0000).eax } >= 0x8000_0005 {
// SAFETY: cpuid called with valid leaves
let leaf = unsafe { std::arch::x86_64::__cpuid(0x8000_0005) };
entry.eax = leaf.eax;
entry.ebx = leaf.ebx;
entry.ecx = leaf.ecx;
entry.edx = leaf.edx;
}
}
}
// Copy host L2 cache details if not populated by KVM
0x8000_0006 => {
if entry.eax == 0 && entry.ebx == 0 && entry.ecx == 0 && entry.edx == 0 {