[Bug 213257] KVM-PR: FPU is broken when single-stepping

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=213257

--- Comment #4 from Luke Kenneth Casson Leighton (lkcl@lkcl.net) ---
(In reply to Lauri Kasanen from comment #3)
> That's probably not worth trying, since the computation results were
> also wrong.

ok. and the initial setup starts from a blank FPU, no host modification of FPRs
needed

> The computation does not rely on register setting, it
> loads, computes and saves entirely in code.

i realised i just said this exact thing, above, in a different way.

and is it the case that the minippc kvm host program is not attempting to read
(or write) the FPR regfile after each guest singlestep?

not that i would expect reading of the FPR regfile from the host to affect the
guest, but it's worth confirming.

trying to think, how else can this be debugged, to find out what's going on?

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