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hypervisor: Add support for legacy I/O port emulation

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Legacy port emulation requires reading RAX register from GHCB page for
SEV-SNP guest. This is the major difference between a regular guest and
SEV-SNP enabled 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 10:23:28 +00:00 committed by Bo Chen
parent e2288a8d2c
commit 7975207e0f
2 changed files with 73 additions and 0 deletions
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72
hypervisor/src/mshv/mod.rs
View File

@ -848,6 +848,78 @@ impl cpu::Vcpu for MshvVcpu {
.gpa_write(&mut swei2_rw_gpa_arg)
.map_err(|e| cpu::HypervisorCpuError::GpaWrite(e.into()))?;
}
SVM_EXITCODE_IOIO_PROT => {
let exit_info1 =
info.__bindgen_anon_2.__bindgen_anon_1.sw_exit_info1 as u32;
let port_info = hv_sev_vmgexit_port_info {
as_uint32: exit_info1,
};
let port =
// SAFETY: Accessing a union element from bindgen generated bindings.
unsafe { port_info.__bindgen_anon_1.intercepted_port() };
let mut len = 4;
// SAFETY: Accessing a union element from bindgen generated bindings.
unsafe {
if port_info.__bindgen_anon_1.operand_size_16bit() == 1 {
len = 2;
} else if port_info.__bindgen_anon_1.operand_size_8bit()
== 1
{
len = 1;
}
}
let is_write =
// SAFETY: Accessing a union element from bindgen generated bindings.
unsafe { port_info.__bindgen_anon_1.access_type() == 0 };
let mut rax_rw_gpa_arg: mshv_read_write_gpa =
mshv_bindings::mshv_read_write_gpa {
base_gpa: ghcb_gpa + GHCB_RAX_OFFSET,
byte_count: std::mem::size_of::<u64>() as u32,
..Default::default()
};
self.fd
.gpa_read(&mut rax_rw_gpa_arg)
.map_err(|e| cpu::HypervisorCpuError::GpaRead(e.into()))?;
if is_write {
if let Some(vm_ops) = &self.vm_ops {
vm_ops
.pio_write(
port.into(),
&rax_rw_gpa_arg.data[0..len],
)
.map_err(|e| {
cpu::HypervisorCpuError::RunVcpu(e.into())
})?;
}
} else {
if let Some(vm_ops) = &self.vm_ops {
vm_ops
.pio_read(
port.into(),
&mut rax_rw_gpa_arg.data[0..len],
)
.map_err(|e| {
cpu::HypervisorCpuError::RunVcpu(e.into())
})?;
}
self.fd.gpa_write(&mut rax_rw_gpa_arg).map_err(|e| {
cpu::HypervisorCpuError::GpaWrite(e.into())
})?;
}
// Clear the SW_EXIT_INFO1 register to indicate no error
let mut swei1_rw_gpa_arg = mshv_bindings::mshv_read_write_gpa {
base_gpa: ghcb_gpa + GHCB_SW_EXITINFO1_OFFSET,
byte_count: std::mem::size_of::<u64>() as u32,
..Default::default()
};
self.fd
.gpa_write(&mut swei1_rw_gpa_arg)
.map_err(|e| cpu::HypervisorCpuError::GpaWrite(e.into()))?;
}
_ => panic!(
"GHCB_INFO_NORMAL: Unhandled exit code: {:0x}",
exit_code

1
hypervisor/src/mshv/snp_constants.rs
View File

@ -19,5 +19,6 @@ pub const ECDSA_SIG_Y_COMPONENT_END: usize =
// These constants are derived from GHCB spec Sect. 2.6 Table 3 GHCB Layout
// Link: https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/specifications/56421.pdf
pub const GHCB_RAX_OFFSET: u64 = 0x01F8;
pub const GHCB_SW_EXITINFO1_OFFSET: u64 = 0x398;
pub const GHCB_SW_EXITINFO2_OFFSET: u64 = 0x3A0;