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>
