[Bug 204209] kernel 5.2.1: "floating point exception" in qemu with kvm enabled

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https://bugzilla.kernel.org/show_bug.cgi?id=204209

--- Comment #3 from anthony (antdev66@xxxxxxxxx) ---
Today I saw the following commit:

>Revert "kvm: x86: Use task structs fpu field for user"
>commit ec269475cba7bcdd1eb8fdf8e87f4c6c81a376fe upstream.
>
>This reverts commit 240c35a3783ab9b3a0afaba0dde7291295680a6b
>("kvm: x86: Use task structs fpu field for user", 2018-11-06).
>The commit is broken and causes QEMU's FPU state to be destroyed
>when KVM_RUN is preempted.
>
>Fixes: 240c35a3783a ("kvm: x86: Use task structs fpu field for user")

applied to the 5.2.4 kernel and I thought it could relate to the reported bug,
but recompiling the kernel without previous indicated patch, the guest report
"fpu exception" error again: it was necessary to re-include the patch and
recompile the kernel for it to work.

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