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hypervisor: mshv: use mapped register page for port handling

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MSHV allows VMM to map the VP register page into root.
This feature helps VMM to faster process most of the frequent
used registers. This patch uses the VP register page for port
handling in CPU run method.

Signed-off-by: Muminul Islam <muislam@microsoft.com>
This commit is contained in:
Muminul Islam
2025-04-17 13:06:18 -07:00
committed by Muminul Islam Russell
parent af2ce3e0cc
commit b5aeb1f63c
1 changed files with 27 additions and 10 deletions
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37
hypervisor/src/mshv/mod.rs
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@@ -720,17 +720,34 @@ impl cpu::Vcpu for MshvVcpu {
match port {
0x402 | 0x510 | 0x511 | 0x514 => {
let insn_len = info.header.instruction_length() as u64;
/*
* Advance RIP and update RAX
* First, try to update the registers using VP register page
* which is mapped into user space for faster access.
* If the register page is not available, fall back to regular
* IOCTL to update the registers.
*/
if let Some(reg_page) = self.fd.get_vp_reg_page() {
let vp_reg_page = reg_page.0;
set_gp_regs_field_ptr!(vp_reg_page, rax, ret_rax);
// SAFETY: access union fields
unsafe {
(*vp_reg_page).__bindgen_anon_1.__bindgen_anon_1.rip =
info.header.rip + insn_len;
(*vp_reg_page).dirty |= 1 << HV_X64_REGISTER_CLASS_IP;
}
} else {
let arr_reg_name_value = [
(
hv_register_name_HV_X64_REGISTER_RIP,
info.header.rip + insn_len,
),
(hv_register_name_HV_X64_REGISTER_RAX, ret_rax),
];
set_registers_64!(self.fd, arr_reg_name_value)
.map_err(|e| cpu::HypervisorCpuError::SetRegister(e.into()))?;
}
/* Advance RIP and update RAX */
let arr_reg_name_value = [
(
hv_register_name_HV_X64_REGISTER_RIP,
info.header.rip + insn_len,
),
(hv_register_name_HV_X64_REGISTER_RAX, ret_rax),
];
set_registers_64!(self.fd, arr_reg_name_value)
.map_err(|e| cpu::HypervisorCpuError::SetRegister(e.into()))?;
return Ok(cpu::VmExit::Ignore);
}
_ => {}