Add ability to debug additional registers via gdb #817
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jsturtevant
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dblnz
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Aug 25, 2025
| @@ -591,6 +591,9 @@ impl Hypervisor for KVMDriver { | |||
| mxcsr: MXCSR_DEFAULT, | |||
| ..Default::default() // zero out the rest | |||
| }; | |||
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| // note kvm set_fpu doesn't actually set or read the mxcsr value | |||
| // https://elixir.bootlin.com/linux/v6.16/source/arch/x86/kvm/x86.c#L12229 | |||
| self.vcpu_fd.set_fpu(&fpu)?; | |||
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How could we change the code to set/read the mxcsr value?
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using xsave, probably should open a separate PR to do that. for this particular spot
Signed-off-by: James Sturtevant <[email protected]>
Signed-off-by: James Sturtevant <[email protected]>
Signed-off-by: James Sturtevant <[email protected]>
Signed-off-by: James Sturtevant <[email protected]>
Signed-off-by: James Sturtevant <[email protected]>
Signed-off-by: James Sturtevant <[email protected]>
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This pull request adds support for reading and writing XMM and MXCSR registers in the GDB debug interface for all supported hypervisors (KVM, MSHV, and WHVP). It introduces new fields to the register structures to hold these values and implements the necessary logic to fetch and store them using each hypervisor's API.
Register structure updates:
xmm: [u128; 16]andmxcsr: u32fields to theX86_64Regsstruct to store XMM registers and MXCSR control state.Todo: