KVM: x86 emulator: Fix popf emulation
POPF behaves differently depending on current CPU mode. Emulate correct logic to prevent guest from changing flags that it can't change otherwise. Signed-off-by: NGleb Natapov <gleb@redhat.com> Cc: stable@kernel.org Signed-off-by: NAvi Kivity <avi@redhat.com>
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