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114 lines
3.0 KiB
114 lines
3.0 KiB
#include "vmxexit_handler.h"
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auto vmresume_failure() -> void
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{
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size_t value;
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__vmx_vmread(VMCS_VM_INSTRUCTION_ERROR, &value);
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dbg::print("> vmresume error... reason = 0x%x\n", value);
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}
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auto exit_handler(hv::pguest_registers regs) -> void
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{
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u64 exit_reason;
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__vmx_vmread(VMCS_EXIT_REASON, &exit_reason);
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switch (exit_reason)
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{
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case VMX_EXIT_REASON_EXECUTE_CPUID:
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{
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int result[4];
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__cpuid(result, regs->rax);
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regs->rax = result[0];
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regs->rbx = result[1];
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regs->rcx = result[2];
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regs->rdx = result[3];
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goto advance_rip;
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}
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case VMX_EXIT_REASON_NMI_WINDOW:
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{
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exception::injection(interruption_type::non_maskable_interrupt, EXCEPTION_NMI);
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// turn off NMI window exiting since we handled the NMI...
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ia32_vmx_procbased_ctls_register procbased_ctls;
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__vmx_vmread(VMCS_CTRL_PROCESSOR_BASED_VM_EXECUTION_CONTROLS, &procbased_ctls.flags);
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// if an NMI happens right here and my NMI handler sets nmi window exiting on...
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// its going to be overwritten with off right here... sus...
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procbased_ctls.nmi_window_exiting = false;
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__vmx_vmwrite(VMCS_CTRL_PROCESSOR_BASED_VM_EXECUTION_CONTROLS, procbased_ctls.flags);
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goto dont_advance;
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}
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case VMX_EXIT_REASON_EXCEPTION_OR_NMI:
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{
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ia32_vmx_procbased_ctls_register procbased_ctls;
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__vmx_vmread(VMCS_CTRL_PROCESSOR_BASED_VM_EXECUTION_CONTROLS, &procbased_ctls.flags);
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procbased_ctls.nmi_window_exiting = true;
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__vmx_vmwrite(VMCS_CTRL_PROCESSOR_BASED_VM_EXECUTION_CONTROLS, procbased_ctls.flags);
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goto dont_advance;
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}
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case VMX_EXIT_REASON_EXECUTE_XSETBV:
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{
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if (handle::xsetbv(regs))
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goto advance_rip;
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else
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goto dont_advance;
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}
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case VMX_EXIT_REASON_EXECUTE_RDMSR:
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{
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if (handle::rdmsr(regs))
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goto advance_rip;
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else
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goto dont_advance;
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}
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case VMX_EXIT_REASON_EXECUTE_WRMSR:
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{
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if (handle::wrmsr(regs))
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goto advance_rip;
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else
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goto dont_advance;
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}
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case VMX_EXIT_REASON_EXECUTE_VMCALL:
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{
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if (handle::vmcall(regs))
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goto advance_rip;
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else
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goto dont_advance;
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}
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case VMX_EXIT_REASON_EXECUTE_INVD:
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{
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__wbinvd();
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goto advance_rip;
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}
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case VMX_EXIT_REASON_EXECUTE_VMWRITE:
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case VMX_EXIT_REASON_EXECUTE_VMREAD:
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case VMX_EXIT_REASON_EXECUTE_VMPTRST:
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case VMX_EXIT_REASON_EXECUTE_VMPTRLD:
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case VMX_EXIT_REASON_EXECUTE_VMCLEAR:
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case VMX_EXIT_REASON_EXECUTE_VMXOFF:
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case VMX_EXIT_REASON_EXECUTE_VMXON:
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case VMX_EXIT_REASON_EXECUTE_VMFUNC:
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{
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exception::injection(interruption_type::hardware_exception, EXCEPTION_INVALID_OPCODE);
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goto dont_advance;
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}
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default:
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// TODO: check out the vmexit reason and add support for it...
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__debugbreak();
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}
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advance_rip:
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size_t rip, exec_len;
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__vmx_vmread(VMCS_GUEST_RIP, &rip);
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__vmx_vmread(VMCS_VMEXIT_INSTRUCTION_LENGTH, &exec_len);
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__vmx_vmwrite(VMCS_GUEST_RIP, rip + exec_len);
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// since we are advancing RIP, also check if TF = 1, if so, set pending #DB...
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// otherwise this #DB will fire on the wrong instruction... please refer to:
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// https://howtohypervise.blogspot.com/2019/01/a-common-missight-in-most-hypervisors.html
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exception::handle_debug();
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dont_advance:
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return;
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} |