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hypervisor: Add support for handling extended guest request

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Currently MSHV does not support fetching extended guest report and thus
return an appropriate error stating the NAE event is not valid.

Signed-off-by: Jinank Jain <jinankjain@microsoft.com>
Signed-off-by: Nuno Das Neves <nudasnev@microsoft.com>
This commit is contained in:
Jinank Jain
2023-10-19 08:40:36 +00:00
committed by Bo Chen
parent cb5ea05945
commit e2288a8d2c
1 changed files with 17 additions and 0 deletions
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17
hypervisor/src/mshv/mod.rs
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@@ -831,6 +831,23 @@ impl cpu::Vcpu for MshvVcpu {
} }
} }
} }
SVM_EXITCODE_SNP_EXTENDED_GUEST_REQUEST => {
warn!("Fetching extended guest request is not supported");
// Extended guest request is not supported by the Hypervisor
// Returning the error to the guest
// 0x6 means `The NAE event was not valid`
// Reference: GHCB Spec, page 42
let value: u64 = 0x6;
let mut swei2_rw_gpa_arg = mshv_bindings::mshv_read_write_gpa {
base_gpa: ghcb_gpa + GHCB_SW_EXITINFO2_OFFSET,
byte_count: std::mem::size_of::<u64>() as u32,
..Default::default()
};
swei2_rw_gpa_arg.data.copy_from_slice(&value.to_le_bytes());
self.fd
.gpa_write(&mut swei2_rw_gpa_arg)
.map_err(|e| cpu::HypervisorCpuError::GpaWrite(e.into()))?;
}
_ => panic!( _ => panic!(
"GHCB_INFO_NORMAL: Unhandled exit code: {:0x}", "GHCB_INFO_NORMAL: Unhandled exit code: {:0x}",
exit_code exit_code