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hypervisor: Add support MMIO read VMGEXIT

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MMIO emulation is also performed via VMGEXIT in case of SEV-SNP guest.
Emulation is done in a very similar way like a regular guest. Just need
to make sure that guest memory is access via read/write GPA hypercall
instead of directly accessing it.

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 10:43:57 +00:00 committed by Bo Chen
parent 7975207e0f
commit ac43825f79
1 changed files with 28 additions and 0 deletions
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28
hypervisor/src/mshv/mod.rs
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@ -920,6 +920,34 @@ impl cpu::Vcpu for MshvVcpu {
.gpa_write(&mut swei1_rw_gpa_arg)
.map_err(|e| cpu::HypervisorCpuError::GpaWrite(e.into()))?;
}
SVM_EXITCODE_MMIO_READ => {
let src_gpa =
info.__bindgen_anon_2.__bindgen_anon_1.sw_exit_info1;
let dst_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 data: Vec<u8> = vec![0; data_len];
if let Some(vm_ops) = &self.vm_ops {
vm_ops.mmio_read(src_gpa, &mut data[0..data_len]).map_err(
|e| cpu::HypervisorCpuError::RunVcpu(e.into()),
)?;
}
let mut arg: mshv_read_write_gpa =
mshv_bindings::mshv_read_write_gpa {
base_gpa: dst_gpa,
byte_count: data_len as u32,
..Default::default()
};
arg.data[0..data_len].copy_from_slice(&data);
self.fd
.gpa_write(&mut arg)
.map_err(|e| cpu::HypervisorCpuError::GpaWrite(e.into()))?;
}
_ => panic!(
"GHCB_INFO_NORMAL: Unhandled exit code: {:0x}",
exit_code