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hypervisor: Add support for registering GHCB GPA with hypervisor

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SEV-SNP guest allocates a GHCB page and in order to update hypervisor
about the same, there is a vmgexit which allows registering GHCB page
with the hypervisor.

Signed-off-by: Jinank Jain <jinankjain@microsoft.com>
Signed-off-by: Muminul Islam <muislam@microsoft.com>
This commit is contained in:
Jinank Jain 2023-10-18 11:45:31 +00:00 committed by Bo Chen
parent 437e6088e6
commit 6f4d82bd61
1 changed files with 41 additions and 0 deletions
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41
hypervisor/src/mshv/mod.rs
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@ -652,6 +652,47 @@ impl cpu::Vcpu for MshvVcpu {
set_registers_64!(self.fd, arr_reg_name_value)
.map_err(|e| cpu::HypervisorCpuError::SetRegister(e.into()))?;
}
GHCB_INFO_REGISTER_REQUEST => {
let mut ghcb_gpa = hv_x64_register_sev_ghcb::default();
// SAFETY: Accessing a union element from bindgen generated bindings.
unsafe {
ghcb_gpa.__bindgen_anon_1.set_enabled(1);
ghcb_gpa
.__bindgen_anon_1
.set_page_number(ghcb_msr.__bindgen_anon_2.gpa_page_number());
}
// SAFETY: Accessing a union element from bindgen generated bindings.
let reg_name_value = unsafe {
[(
hv_register_name_HV_X64_REGISTER_SEV_GHCB_GPA,
ghcb_gpa.as_uint64,
)]
};
set_registers_64!(self.fd, reg_name_value)
.map_err(|e| cpu::HypervisorCpuError::SetRegister(e.into()))?;
let mut resp_ghcb_msr = svm_ghcb_msr::default();
// SAFETY: Accessing a union element from bindgen generated bindings.
unsafe {
resp_ghcb_msr
.__bindgen_anon_2
.set_ghcb_info(GHCB_INFO_REGISTER_RESPONSE as u64);
resp_ghcb_msr.__bindgen_anon_2.set_gpa_page_number(
ghcb_msr.__bindgen_anon_2.gpa_page_number(),
);
}
// SAFETY: Accessing a union element from bindgen generated bindings.
let reg_name_value = unsafe {
[(
hv_register_name_HV_X64_REGISTER_GHCB,
resp_ghcb_msr.as_uint64,
)]
};
set_registers_64!(self.fd, reg_name_value)
.map_err(|e| cpu::HypervisorCpuError::SetRegister(e.into()))?;
}
_ => panic!("Unsupported VMGEXIT operation: {:0x}", ghcb_op),
}