x86/svm: Fix handling of EFLAGS.RF on task switch

x86/svm: Fix handling of EFLAGS.RF on task switch

VT-x updates RF before vmexit, so eflags written into the outgoing TSS happens
to be correct.  SVM does not update RF before vmexit, and instead provides it
via a bit in exitinfo2.

In practice, needing RF set in the outgoing state occurs when a task gate is
used to handle faults.

Extend hvm_task_switch() with an extra_eflags parameter which gets fed into
the outgoing TSS, and fill it in suitably from the SVM vmexit information.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>