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hypervisor: mshv: Override hypervisor R/W behavior for unknown MSR

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By default Microsoft Hypervisor send a GP to the guest if it tries
read/write an unimplemented MSR from the hypervisor prospective. Instead
change this behavior to ignore read/write operations for unimplemented
MSRs

Signed-off-by: Jinank Jain <jinankjain@microsoft.com>
This commit is contained in:
Jinank Jain 2022-06-07 12:36:24 +00:00 committed by Liu Wei
parent 64b4b7205e
commit ada85f68f6
2 changed files with 16 additions and 0 deletions
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5
hypervisor/src/hypervisor.rs
View File

@ -66,6 +66,11 @@ pub enum HypervisorError {
///
#[error("Failed to retrieve TDX capabilities:{0}")]
TdxCapabilities(#[source] anyhow::Error),
///
/// Failed to set partition property
///
#[error("Failed to set partition property:{0}")]
SetPartitionProperty(#[source] anyhow::Error),
}
///

11
hypervisor/src/mshv/mod.rs
View File

@ -108,6 +108,17 @@ impl hypervisor::Hypervisor for MshvHypervisor {
break;
}
// Default Microsoft Hypervisor behavior for unimplemented MSR is to
// send a fault to the guest if it tries to access it. It is possible
// to override this behavior with a more suitable option i.e., ignore
// writes from the guest and return zero in attempt to read unimplemented
// MSR.
fd.set_partition_property(
hv_partition_property_code_HV_PARTITION_PROPERTY_UNIMPLEMENTED_MSR_ACTION,
hv_unimplemented_msr_action_HV_UNIMPLEMENTED_MSR_ACTION_IGNORE_WRITE_READ_ZERO as u64,
)
.map_err(|e| hypervisor::HypervisorError::SetPartitionProperty(e.into()))?;
let msr_list = self.get_msr_list()?;
let num_msrs = msr_list.as_fam_struct_ref().nmsrs as usize;
let mut msrs = MsrEntries::new(num_msrs).unwrap();