On 06/15/2011 01:20 PM, Jan Kiszka wrote:
> > So fopcode will usually be clear. > OK. So if bit 2 of IA32_MISC_ENABLE MSR, we must save that fields. But if it's off, how to test for that other condition "last non-transparent FP instruction ... had an unmasked exception" from the host?
We save fopcode unconditionally. But if IA32_MISC_ENABLE_MSR[2]=0, then fopcode will be zero, and we can skip the subsection (if the data and instruction pointers are also zero, which they will be).
If it isn't zero, there's still a good chance fopcode will be zero (64-bit userspace, thread that hasn't used the fpu since the last context switch, last opcode happened to be zero).
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