[OpenPOWER-HDL-Cores] https://bugzilla.kernel.org/show_bug.cgi?id=213257

Benjamin Herrenschmidt benh at kernel.crashing.org
Sun May 30 22:53:34 UTC 2021


On Sun, 2021-05-30 at 05:12 +0100, Luke Kenneth Casson Leighton wrote:
> sorry a little abrupt there ben.
> insights from someone on twitter.
> VSX may have the same flaw.
> when debugging any guest under any program using KVM
> (qemu, the one we're writing, any other)
> any single step over FP or VSX insn
> results in guest corruption of regfiles.
> 
> unless KVM's usage API requires the *caller* (host) to
> preserve FP (and VSX) regs and FPSCR?
> still does not make sense that non-single-step kvm works perfectly.

Nah it could well be a KVM bug, not sure

Ben.




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