x86_vcpu 0.5.11

x86 Virtual CPU implementation for the Arceos Hypervisor
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use core::arch::asm;

pub type Result<T = ()> = core::result::Result<T, ()>;

/// Enter the guest by executing `VMRUN`.
#[inline(always)]
pub unsafe fn vmrun(vmcb_pa: u64) -> ! {
    unsafe {
        asm!("vmrun rax", in("rax") vmcb_pa, options(noreturn, nostack));
    }
}

/// Save guest state selected by `VMSAVE` into the VMCB.
#[inline(always)]
pub unsafe fn vmsave(vmcb_pa: u64) -> Result {
    unsafe {
        asm!("vmsave rax", in("rax") vmcb_pa, options(nostack, preserves_flags));
    }
    Ok(())
}

/// Load guest state selected by `VMLOAD` from the VMCB.
#[inline(always)]
pub unsafe fn vmload(vmcb_pa: u64) -> Result {
    unsafe {
        asm!("vmload rax", in("rax") vmcb_pa, options(nostack, preserves_flags));
    }
    Ok(())
}

#[inline(always)]
pub unsafe fn stgi() {
    unsafe {
        asm!("stgi", options(nostack, preserves_flags));
    }
}

#[inline(always)]
pub unsafe fn clgi() {
    unsafe {
        asm!("clgi", options(nostack, preserves_flags));
    }
}

#[inline(always)]
pub unsafe fn invlpga(addr: u64, asid: u32) {
    unsafe {
        asm!(
            "invlpga rax, ecx",
            in("rax") addr,
            in("ecx") asid,
            options(nostack, preserves_flags),
        );
    }
}