On 14/11/2017 19:07, Rik van Riel wrote: > My question is, can the in-kernel emulator code ever > be called from OUTSIDE the KVM_RUN ioctl loop?
No, it can't. This makes the patch much more appealing... Paolo > If so, we need to restore the user FPU context before > returning from the emulator code. Given that the current > emulator code does not do that, I suspect this is not > the case. I also see no path from the kvm ioctl into > the emulator code, other than via KVM_RUN. > > The FPU and XSAVE ioctls all work on the saved > vcpu->arch.guest_fpu data, and never directly on the > registers.
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