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From:   bugzilla-daemon@bugzilla.kernel.org
To:     kvm@vger.kernel.org
Subject: [Bug 204209] kernel 5.2.1: "floating point exception" in qemu with
 kvm enabled
Date:   Sun, 28 Jul 2019 12:03:53 +0000
X-Bugzilla-Reason: None
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: AssignedTo virtualization_kvm@kernel-bugs.osdl.org
X-Bugzilla-Product: Virtualization
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X-Bugzilla-Who: antdev66@gmail.com
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Message-ID: <bug-204209-28872-4WZEoEeYbQ@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=204209

--- Comment #3 from anthony (antdev66@gmail.com) ---
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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