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vmm: acpi: Add an _MAT for the CPU devices containing a LAPIC

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The Linux kernel expects all CPUs, whether they be enabled or disabled
to have an _MAT entry containing the LAPIC details for this CPU with the
enabled bit set to 1 (in the flags.)

In the MADT table the same bit is used to determine if the CPU is
present at boot vs available later.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2019-11-20 13:39:16 +00:00 committed by Sebastien Boeuf
parent e51ebe045f
commit 5faf8b756c
1 changed files with 19 additions and 1 deletions
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20
vmm/src/acpi.rs
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@ -113,8 +113,22 @@ struct CPU {
present: bool,
}
const MADT_CPU_ENABLE_FLAG: usize = 0;
impl aml::Aml for CPU {
fn to_aml_bytes(&self) -> Vec<u8> {
let lapic = LocalAPIC {
r#type: 0,
length: 8,
processor_id: self.cpu_id,
apic_id: self.cpu_id,
flags: 1 << MADT_CPU_ENABLE_FLAG,
};
let mut mat_data: Vec<u8> = Vec::new();
mat_data.resize(std::mem::size_of_val(&lapic), 0);
unsafe { *(mat_data.as_mut_ptr() as *mut LocalAPIC) = lapic };
aml::Device::new(
format!("C{:03}", self.cpu_id).as_str().into(),
vec![
@ -139,6 +153,10 @@ impl aml::Aml for CPU {
&aml::ZERO
})],
),
// The Linux kernel expects every CPU device to have a _MAT entry
// containing the LAPIC for this processor with the enabled bit set
// even it if is disabled in the MADT (non-boot CPU)
&aml::Name::new("_MAT".into(), &aml::Buffer::new(mat_data))
],
)
.to_aml_bytes()
@ -322,7 +340,7 @@ pub fn create_acpi_tables(
length: 8,
processor_id: cpu,
apic_id: cpu,
flags: 1,
flags: 1 << MADT_CPU_ENABLE_FLAG,
};
madt.append(lapic);
}