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https://github.com/cloud-hypervisor/cloud-hypervisor.git
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5a187ee2c2
Add an I/O port "device" to handle requests from the kernel to shutdown or trigger a reboot, borrowing an I/O used for ACPI on the Q35 platform. The details of this I/O port are included in the FADT (SLEEP_STATUS_REG/SLEEP_CONTROL_REG/RESET_REG) with the details of the value to write in the FADT for reset (RESET_VALUE) and in the DSDT for shutdown (S5 -> 0x05) Signed-off-by: Rob Bradford <robert.bradford@intel.com>
53 lines
1.6 KiB
Rust
53 lines
1.6 KiB
Rust
// Copyright © 2019 Intel Corporation
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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use vmm_sys_util::eventfd::EventFd;
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use BusDevice;
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/// A device for handling ACPI shutdown and reboot
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pub struct AcpiShutdownDevice {
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exit_evt: EventFd,
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reset_evt: EventFd,
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}
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impl AcpiShutdownDevice {
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/// Constructs a device that will signal the given event when the guest requests it.
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pub fn new(exit_evt: EventFd, reset_evt: EventFd) -> AcpiShutdownDevice {
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AcpiShutdownDevice {
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exit_evt,
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reset_evt,
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}
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}
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}
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// Same I/O port used for shutdown and reboot
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impl BusDevice for AcpiShutdownDevice {
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// Spec has all fields as zero
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fn read(&mut self, _base: u64, _offset: u64, data: &mut [u8]) {
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for i in data.iter_mut() {
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*i = 0;
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}
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}
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fn write(&mut self, _base: u64, _offset: u64, data: &[u8]) {
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if data[0] == 1 {
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debug!("ACPI Reboot signalled");
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if let Err(e) = self.reset_evt.write(1) {
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error!("Error triggering ACPI reset event: {}", e);
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}
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}
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// The ACPI DSDT table specifies the S5 sleep state (shutdown) as value 5
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const S5_SLEEP_VALUE: u8 = 5;
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const SLEEP_STATUS_EN_BIT: u8 = 5;
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const SLEEP_VALUE_BIT: u8 = 2;
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if data[0] == (S5_SLEEP_VALUE << SLEEP_VALUE_BIT) | (1 << SLEEP_STATUS_EN_BIT) {
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debug!("ACPI Shutdown signalled");
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if let Err(e) = self.exit_evt.write(1) {
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error!("Error triggering ACPI shutdown event: {}", e);
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}
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}
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}
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}
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