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hypervisor: Enable VMGEXIT offload for SEV-SNP partition

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For a SEV-SNP enabled partition on MSHV, some of the VMGEXITS are
offloaded for Hypervisor to handle while the rest are handled by VMM.
By setting this additional partition property hypervisor is informed
about the VMGEXITs it needs to take care off, rest all would be handled
by the CloudHypervisor.

Signed-off-by: Jinank Jain <jinankjain@microsoft.com>
This commit is contained in:
Jinank Jain 2023-10-17 17:08:34 +00:00 committed by Bo Chen
parent aa6e83126c
commit 1afac185ff
1 changed files with 10 additions and 0 deletions
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10
hypervisor/src/mshv/mod.rs
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@ -237,6 +237,7 @@ impl hypervisor::Hypervisor for MshvHypervisor {
// Set additional partition property for SEV-SNP partition.
if mshv_vm_type == VmType::Snp {
let snp_policy = snp::get_default_snp_guest_policy();
let vmgexit_offloads = snp::get_default_vmgexit_offload_features();
// SAFETY: access union fields
unsafe {
debug!(
@ -248,6 +249,15 @@ impl hypervisor::Hypervisor for MshvHypervisor {
snp_policy.as_uint64,
)
.map_err(|e| hypervisor::HypervisorError::SetPartitionProperty(e.into()))?;
debug!(
"Setting the partition property to enable VMGEXIT offloads as : 0x{:x}",
vmgexit_offloads.as_uint64
);
fd.set_partition_property(
hv_partition_property_code_HV_PARTITION_PROPERTY_SEV_VMGEXIT_OFFLOADS,
vmgexit_offloads.as_uint64,
)
.map_err(|e| hypervisor::HypervisorError::SetPartitionProperty(e.into()))?;
}
}