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vmm: Set MADT "Online Capable" flag

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The Linux kernel now checks for this before marking CPUs as
hotpluggable:

commit aa06e20f1be628186f0c2dcec09ea0009eb69778
Author: Mario Limonciello <mario.limonciello@amd.com>
Date:   Wed Sep 8 16:41:46 2021 -0500

    x86/ACPI: Don't add CPUs that are not online capable

    A number of systems are showing "hotplug capable" CPUs when they
    are not really hotpluggable.  This is because the MADT has extra
    CPU entries to support different CPUs that may be inserted into
    the socket with different numbers of cores.

    Starting with ACPI 6.3 the spec has an Online Capable bit in the
    MADT used to determine whether or not a CPU is hotplug capable
    when the enabled bit is not set.

    Link: https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html?#local-apic-flags
    Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2022-07-01 17:41:00 +01:00
parent 0c82e7593d
commit 93237f0106
1 changed files with 4 additions and 1 deletions
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5
vmm/src/cpu.rs
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@ -1271,7 +1271,7 @@ impl CpuManager {
1 << MADT_CPU_ENABLE_FLAG
} else {
0
},
} | 1 << MADT_CPU_ONLINE_CAPABLE_FLAG,
};
madt.append(lapic);
}
@ -1524,6 +1524,9 @@ struct Cpu {
#[cfg(target_arch = "x86_64")]
const MADT_CPU_ENABLE_FLAG: usize = 0;
#[cfg(target_arch = "x86_64")]
const MADT_CPU_ONLINE_CAPABLE_FLAG: usize = 1;
impl Cpu {
#[cfg(target_arch = "x86_64")]
fn generate_mat(&self) -> Vec<u8> {