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hypervisor: Add support for handling SNP guest request

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SEV-SNP guest can request AMD's secure co-processor i.e., PSP to
generate an runtime attesation report. During this process guest needs
to inform PSP about the request and response GPAs where that report
would be generated by the PSP. This is handled via a VMGEXIT request.
Thus, extend the current GHCB handling to add support for it.

Signed-off-by: Jinank Jain <jinankjain@microsoft.com>
This commit is contained in:
Jinank Jain 2023-11-10 07:24:14 +00:00 committed by Bo Chen
parent 96bc282759
commit d7d6054b8c
1 changed files with 26 additions and 0 deletions
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26
hypervisor/src/mshv/mod.rs
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@ -978,6 +978,32 @@ impl cpu::Vcpu for MshvVcpu {
})?;
}
}
SVM_EXITCODE_SNP_GUEST_REQUEST => {
let req_gpa =
info.__bindgen_anon_2.__bindgen_anon_1.sw_exit_info1;
let rsp_gpa =
info.__bindgen_anon_2.__bindgen_anon_1.sw_exit_info2;
let mshv_psp_req =
mshv_issue_psp_guest_request { req_gpa, rsp_gpa };
self.vm_fd
.psp_issue_guest_request(&mshv_psp_req)
.map_err(|e| cpu::HypervisorCpuError::RunVcpu(e.into()))?;
debug!(
"SNP guest request: req_gpa {:0x} rsp_gpa {:0x}",
req_gpa, rsp_gpa
);
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()
};
self.fd
.gpa_write(&mut swei2_rw_gpa_arg)
.map_err(|e| cpu::HypervisorCpuError::GpaWrite(e.into()))?;
}
_ => panic!(
"GHCB_INFO_NORMAL: Unhandled exit code: {:0x}",
exit_code