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-RISC-V: VS external IRQ can be taken in M-mode
-Description of problem:
-The RISC-V specification states that `VS-level interrupts and guest external interrupts are always delegated past M-mode to HS mode.`
-I happened to come across a situation where QEMU takes the vs_external IRQ in machine mode.
-Steps to reproduce:
-1. Enable IRQs globally (mstatus, vsstatus)
-2. Set hstatus.VGEIN to a legal value
-3. Write -1 to mie
-4. Write -1 to hvip
-
-I included a binary that should be able to reproduce the issue.
-
-I use a vectored setup for mtvec and as soon as the VSEIP bit in hvip has been set the machine jumps to mtvec.vsei.
-To confirm that I actually went to mtvec and not somewhere with a faulty print I also performed an ecall and that was reported as an M mode ecall.
-Additional information:
-```
-TRACE: [hart_ctrl.c:35] STARTING CPU 0
-DEBUG: [trap_handling.c: 886] Setting up trap handlers
-DEBUG: [aia_ctrl.c: 377] Initializing interrupt controller
-TRACE: [main.c:31] Writing -1 to mie
-TRACE: [main.c:33] Writing -1 to hvip
-riscv_cpu_do_interrupt: hart:0, async:1, cause:000000000000000a, epc:0x0000000080000114, tval:0x0000000000000000, desc=vs_external
-ERROR: [trap_handling.c:280] mtvec_vsei should be unreachable
-mstatus = 0x0000000a000038a2    hstatus:         
-  SIE  = 1                        VSXL[1:0]   = 2
-  MIE  = 0                        VTSR        = 0
-  SPIE = 1                        VTW         = 0
-  UBE  = 0                        VTVM        = 0
-  MPIE = 1                        VGEIN[5:0]  = 1
-  SPP  = 0                        HU          = 0
-  VS   = 0                        SPVP        = 0
-  MPP  = 3                        SPV         = 0
-  FS   = 1                        GVA         = 0
-  MPRV = 0                        VSBE        = 0
-  SUM  = 0
-  MXR  = 0
-  TVM  = 0
-  TW   = 0
-  TSR  = 0
-  UXL  = 2
-  SXL  = 2
-  SBE  = 0
-  MBE  = 0
-  GVA  = 0
-  MPV  = 0
-mie                  mip                  mideleg                hvip                
-    ssie (1)   =  1      ssip (1)   =  0      ssi  (1)   =  0        ssip (1)   =  0 
-    vssie(2)   =  1      vssip(2)   =  1      vssi (2)   =  0        vssip(2)   =  1 
-    msie (3)   =  1      msip (3)   =  0      msi  (3)   =  0        msip (3)   =  0 
-    stie (5)   =  1      stip (5)   =  0      sti  (5)   =  0        stip (5)   =  0 
-    vstie(6)   =  1      vstip(6)   =  0      vsti (6)   =  0        vstip(6)   =  0 
-    mtie (7)   =  1      mtip (7)   =  0      mti  (7)   =  0        mtip (7)   =  0 
-    seie (9)   =  1      seip (9)   =  0      sei  (9)   =  0        seip (9)   =  0 
-    vseie(10)  =  1      vseip(10)  =  1      vsei (10)  =  0        vseip(10)  =  1 
-    meie (11)  =  1      meip (11)  =  0      mei  (11)  =  0        meip (11)  =  0 
-    sgeie(12)  =  1      sgeip(12)  =  0      sgei (12)  =  0        sgeip(12)  =  0 
-DEBUG: [trap_handling.c:  28] hart_ctrl.kill_hart = 0x8000a00c
-TRACE: [trap_handling.c:29] Program done, exiting
-QEMU: Terminated
-```
-Reproducer of the problem:
-[main](/uploads/26a5698ce948149ca9d34f6b3dfac6a4/main)