40 lines
1.3 KiB
C
40 lines
1.3 KiB
C
#ifndef UTSM_HYPERCALL_H
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#define UTSM_HYPERCALL_H
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/* UTSM-side VMCALL hypercall handler.
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*
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* When the Linux guest executes a VMCALL instruction, it triggers a VM-Exit
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* with exit reason EXIT_VMCALL (18). The guest places:
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* RAX = UTSM_HCALL_MAGIC | op (identifies this as a UTSM hypercall)
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* RDI = arg0
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* RSI = arg1
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* RDX = arg2
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*
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* The handler validates the magic, dispatches to the operation handler,
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* writes the return value into GUEST_RAX, and advances GUEST_RIP past
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* the VMCALL instruction so the guest resumes normally.
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*
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* If the magic doesn't match, the handler returns a VMFAIL indication
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* (by setting the VMCS vm-exit instruction error), which causes the guest
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* to see VMCALL fail. Phase 1.3: we just return -UTSM_HCALL_NOSYS.
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*
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* Protocol details in CODE/utsm-ipc/ipc_proto.h.
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*/
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#include <utsm/types.h>
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/* VM-Exit handler for VMCALL (exit reason 18).
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*
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* Reads guest RAX/RDI/RSI/RDX from the VMCS save area (passed in by the
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* assembly exit stub), dispatches the hypercall, writes the result to
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* GUEST_RAX, and advances GUEST_RIP.
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*
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* Returns 1 to resume the guest, 0 to terminate. */
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int hypercall_handle(u64 guest_rax, u64 guest_rdi, u64 guest_rsi, u64 guest_rdx,
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u64 guest_rip, u64 instr_len);
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/* Statistics */
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u64 hypercall_get_count(void);
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#endif /* UTSM_HYPERCALL_H */
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