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hypervisor: kvm: Save KVM HyperV SynIC emulation state

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As well as saving the MSRs as it is currently does ensure that the KVM
capability is enabled along with keeping the internal state updated.

Signed-off-by: Rob Bradford <rbradford@rivosinc.com>
Co-authored-by: Chengyu Fu <chengyu.fu@linux.alibaba.com>
This commit is contained in:
Rob Bradford 2025-11-21 09:13:38 +00:00
parent 16fbab30b1
commit e993310c96
2 changed files with 9 additions and 1 deletions
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8
hypervisor/src/kvm/mod.rs
View file

@ -2342,7 +2342,8 @@ impl cpu::Vcpu for KvmVcpu {
// Save extra MSRs if the Hyper-V synthetic interrupt controller is
// emulated.
if self.hyperv_synic.load(Ordering::Acquire) {
let hyperv_synic = self.hyperv_synic.load(Ordering::Acquire);
if hyperv_synic {
let hyperv_synic_msrs = vec![
0x40000020, 0x40000021, 0x40000080, 0x40000081, 0x40000082, 0x40000083, 0x40000084,
0x40000090, 0x40000091, 0x40000092, 0x40000093, 0x40000094, 0x40000095, 0x40000096,
@ -2407,6 +2408,7 @@ impl cpu::Vcpu for KvmVcpu {
mp_state,
tsc_khz,
nested_state,
hyperv_synic,
}
.into())
}
@ -2574,6 +2576,10 @@ impl cpu::Vcpu for KvmVcpu {
self.set_tsc_khz(freq)?;
}
if state.hyperv_synic {
self.enable_hyperv_synic()?;
}
// Try to set all MSRs previously stored.
// If the number of MSRs set from SET_MSRS is different from the
// expected amount, we fallback onto a slower method by setting MSRs

2
hypervisor/src/kvm/x86_64/mod.rs
View file

@ -79,6 +79,8 @@ pub struct VcpuKvmState {
// Option to prevent useless 8K (de)serialization when no nested
// state exists.
pub nested_state: Option<KvmNestedStateBuffer>,
#[serde(default)]
pub hyperv_synic: bool,
}
impl From<SegmentRegister> for kvm_segment {