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vmm: Remove PCI PIO optimisation

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This optimisation provided some peformance improvement when measured by
perf however when considered in terms of boot time peformance this
optimisation doesn't have any impact measurable using our
peformance-metrics tooling.

Removing this optimisation helps simplify the VMM internals as it allows
the reordering of the VM creation process permitting refactoring of the
restore code path.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2022-11-22 16:13:52 +00:00
parent 4d9a2b17a7
commit e37ec26ccf
2 changed files with 0 additions and 39 deletions
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8
vmm/src/device_manager.rs
View File

@ -54,8 +54,6 @@ use libc::{
cfmakeraw, isatty, tcgetattr, tcsetattr, termios, MAP_NORESERVE, MAP_PRIVATE, MAP_SHARED,
O_TMPFILE, PROT_READ, PROT_WRITE, TCSANOW,
};
#[cfg(target_arch = "x86_64")]
use pci::PciConfigIo;
use pci::{
DeviceRelocation, PciBarRegionType, PciBdf, PciDevice, VfioPciDevice, VfioUserDmaMapping,
VfioUserPciDevice, VfioUserPciDeviceError,
@ -3564,12 +3562,6 @@ impl DeviceManager {
.map(|ic| ic.clone() as Arc<Mutex<dyn InterruptController>>)
}
#[cfg(target_arch = "x86_64")]
// Used to provide a fast path for handling PIO exits
pub fn pci_config_io(&self) -> Arc<Mutex<PciConfigIo>> {
Arc::clone(self.pci_segments[0].pci_config_io.as_ref().unwrap())
}
pub(crate) fn pci_segments(&self) -> &Vec<PciSegment> {
&self.pci_segments
}

31
vmm/src/vm.rs
View File

@ -87,8 +87,6 @@ use std::{result, str, thread};
use thiserror::Error;
use tracer::trace_scoped;
use vm_device::Bus;
#[cfg(target_arch = "x86_64")]
use vm_device::BusDevice;
#[cfg(feature = "tdx")]
use vm_memory::{Address, ByteValued, GuestMemory, GuestMemoryRegion};
use vm_memory::{Bytes, GuestAddress, GuestAddressSpace, GuestMemoryAtomic};
@ -365,8 +363,6 @@ struct VmOpsHandler {
#[cfg(target_arch = "x86_64")]
io_bus: Arc<Bus>,
mmio_bus: Arc<Bus>,
#[cfg(target_arch = "x86_64")]
pci_config_io: Arc<Mutex<dyn BusDevice>>,
}
impl VmOps for VmOpsHandler {
@ -408,17 +404,6 @@ impl VmOps for VmOpsHandler {
#[cfg(target_arch = "x86_64")]
fn pio_read(&self, port: u64, data: &mut [u8]) -> result::Result<(), HypervisorVmError> {
use pci::{PCI_CONFIG_IO_PORT, PCI_CONFIG_IO_PORT_SIZE};
if (PCI_CONFIG_IO_PORT..(PCI_CONFIG_IO_PORT + PCI_CONFIG_IO_PORT_SIZE)).contains(&port) {
self.pci_config_io.lock().unwrap().read(
PCI_CONFIG_IO_PORT,
port - PCI_CONFIG_IO_PORT,
data,
);
return Ok(());
}
if let Err(vm_device::BusError::MissingAddressRange) = self.io_bus.read(port, data) {
info!("Guest PIO read to unregistered address 0x{:x}", port);
}
@ -427,17 +412,6 @@ impl VmOps for VmOpsHandler {
#[cfg(target_arch = "x86_64")]
fn pio_write(&self, port: u64, data: &[u8]) -> result::Result<(), HypervisorVmError> {
use pci::{PCI_CONFIG_IO_PORT, PCI_CONFIG_IO_PORT_SIZE};
if (PCI_CONFIG_IO_PORT..(PCI_CONFIG_IO_PORT + PCI_CONFIG_IO_PORT_SIZE)).contains(&port) {
self.pci_config_io.lock().unwrap().write(
PCI_CONFIG_IO_PORT,
port - PCI_CONFIG_IO_PORT,
data,
);
return Ok(());
}
match self.io_bus.write(port, data) {
Err(vm_device::BusError::MissingAddressRange) => {
info!("Guest PIO write to unregistered address 0x{:x}", port);
@ -557,16 +531,11 @@ impl Vm {
let io_bus = Arc::clone(device_manager.lock().unwrap().io_bus());
let mmio_bus = Arc::clone(device_manager.lock().unwrap().mmio_bus());
#[cfg(target_arch = "x86_64")]
let pci_config_io =
device_manager.lock().unwrap().pci_config_io() as Arc<Mutex<dyn BusDevice>>;
let vm_ops: Arc<dyn VmOps> = Arc::new(VmOpsHandler {
memory,
#[cfg(target_arch = "x86_64")]
io_bus,
mmio_bus,
#[cfg(target_arch = "x86_64")]
pci_config_io,
});
let exit_evt_clone = exit_evt.try_clone().map_err(Error::EventFdClone)?;