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devices: irqchip: add snapshot/restore for kvm arm64

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Add snapshot/restore support for KVM on arm 64.

BUG=b:274145255
TEST=aosp

Change-Id: Icf59c9121028b85e83de2548084acace7e131842
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/5604653
Reviewed-by: Pierre-Clément Tosi <ptosi@google.com>
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
Commit-Queue: Elie Kheirallah <khei@google.com>
This commit is contained in:
Elie Kheirallah 2024-06-07 12:36:08 +00:00 committed by crosvm LUCI
parent c1589d11ce
commit 9d569bbcc3
1 changed files with 27 additions and 0 deletions
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27
devices/src/irqchip/kvm/aarch64.rs
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@ -4,6 +4,7 @@
use std::sync::Arc;
use anyhow::Context;
use base::errno_result;
use base::ioctl_with_ref;
use base::Result;
@ -173,6 +174,32 @@ impl IrqChipAArch64 for KvmKernelIrqChip {
self.device_kind
}
fn snapshot(&self, _cpus_num: usize) -> anyhow::Result<serde_json::Value> {
if self.device_kind == DeviceKind::ArmVgicV3 {
let save_gic_attr = kvm_device_attr {
group: KVM_DEV_ARM_VGIC_GRP_CTRL,
attr: KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES as u64,
addr: 0,
flags: 0,
};
// SAFETY:
// Safe because we allocated the struct that's being passed in
// Safe because the device interrupts get stored in guest memory
let ret = unsafe { ioctl_with_ref(&self.vgic, KVM_SET_DEVICE_ATTR, &save_gic_attr) };
if ret != 0 {
return errno_result()
.context("ioctl KVM_SET_DEVICE_ATTR for save_gic_attr failed.")?;
}
}
Ok(serde_json::Value::Null)
}
fn restore(&mut self, _data: serde_json::Value, _vcpus_num: usize) -> anyhow::Result<()> {
// SAVE_PENDING_TABLES operation wrote the pending tables into guest memory.
// Assumption is that no work is necessary on restore of IrqChip.
Ok(())
}
fn finalize(&self) -> Result<()> {
let init_gic_attr = kvm_device_attr {
group: KVM_DEV_ARM_VGIC_GRP_CTRL,