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vmm: Only advertise a single PCI bus

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Since we only support a single PCI bus right now advertise only a single
bus in the ACPI tables. This reduces the number of VM exits from probing
substantially.

Number of PCI config I/O port exits: 17871 -> 1551 (91% reduction) with
direct kernel boot.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2021-09-28 11:45:21 +01:00 committed by Sebastien Boeuf
parent eda0dc20d3
commit 4889999277
2 changed files with 2 additions and 2 deletions
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2
vmm/src/acpi.rs
View File

@ -233,7 +233,7 @@ fn create_mcfg_table() -> Sdt {
base_address: arch::layout::PCI_MMCONFIG_START.0,
segment: 0,
start: 0,
end: ((arch::layout::PCI_MMCONFIG_SIZE - 1) >> 20) as u8,
end: 0,
..Default::default()
});
mcfg

2
vmm/src/device_manager.rs
View File

@ -4129,7 +4129,7 @@ impl Aml for DeviceManager {
let crs = aml::Name::new(
"_CRS".into(),
&aml::ResourceTemplate::new(vec![
&aml::AddressSpace::new_bus_number(0x0u16, 0xffu16),
&aml::AddressSpace::new_bus_number(0x0u16, 0x0u16),
#[cfg(target_arch = "x86_64")]
&aml::Io::new(0xcf8, 0xcf8, 1, 0x8),
#[cfg(target_arch = "aarch64")]