QEMU on x64

[Christopher Caulfield <ctcaulfield@gmail.com>]

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Hi QEMU community,

This is Christopher from the debugging experiences team at Microsoft
focused on kernel debugging. I am reaching out with a few questions about
QEMU on x64.


   1. Is it possible for the QEMU-x86-64 GDB Server to send the full set of
   x64 system registers (whether they are included in a separated system xml
   file or as part of the core registers xml file)?
      - e.g. System registers missing from i386-64bit.xml file

      DWORD64 IDTBase;
      DWORD64 IDTLimit;
      DWORD64 GDTBase;
      DWORD64 GDTLimit;
      DWORD SelLDT;
      SEG64_DESC_INFO SegLDT;
      DWORD SelTSS;
      SEG64_DESC_INFO SegTSS;
      2. How can I access x64 MSR registers by using the QEMU-x86-64 GDB
   server?
      - #define MSR_EFER 0xc0000080 // extended function enable register
      #define MSR_STAR 0xc0000081 // system call selectors
      #define MSR_LSTAR 0xc0000082 // system call 64-bit entry
      #define MSR_CSTAR 0xc0000083 // system call 32-bit entry
   3. Going off of #2 - can you access it via reading GDB memory command?
   if not - is there any plan to support reading/writing to MSRs via
   QEMU-x86-64 GDB server?


Thank you for taking time to answer our questions! :)

-Christopher
LinkedIn <https://www.linkedin.com/in/ctcaulfield/> | Twitter
<https://twitter.com/ctcaulfield>

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