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hypervisor: Add support for MMIO write emulation

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This is very similar MMIO read emulation for SEV-SNP guest.

Signed-off-by: Jinank Jain <jinankjain@microsoft.com>
Signed-off-by: Muminul Islam <muislam@microsoft.com>
This commit is contained in:
Jinank Jain 2023-10-19 10:51:38 +00:00 committed by Bo Chen
parent ac43825f79
commit 0287e6a603
1 changed files with 28 additions and 0 deletions
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28
hypervisor/src/mshv/mod.rs
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@ -948,6 +948,34 @@ impl cpu::Vcpu for MshvVcpu {
.gpa_write(&mut arg)
.map_err(|e| cpu::HypervisorCpuError::GpaWrite(e.into()))?;
}
SVM_EXITCODE_MMIO_WRITE => {
let dst_gpa =
info.__bindgen_anon_2.__bindgen_anon_1.sw_exit_info1;
let src_gpa = info.__bindgen_anon_2.__bindgen_anon_1.sw_scratch;
let data_len =
info.__bindgen_anon_2.__bindgen_anon_1.sw_exit_info2
as usize;
// Sanity check to make sure data len is within supported range.
assert!(data_len <= 0x8);
let mut arg: mshv_read_write_gpa =
mshv_bindings::mshv_read_write_gpa {
base_gpa: src_gpa,
byte_count: data_len as u32,
..Default::default()
};
self.fd
.gpa_read(&mut arg)
.map_err(|e| cpu::HypervisorCpuError::GpaRead(e.into()))?;
if let Some(vm_ops) = &self.vm_ops {
vm_ops
.mmio_write(dst_gpa, &arg.data[0..data_len])
.map_err(|e| {
cpu::HypervisorCpuError::RunVcpu(e.into())
})?;
}
}
_ => panic!(
"GHCB_INFO_NORMAL: Unhandled exit code: {:0x}",
exit_code