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x86/HPET: don't enable legacy replacement mode unconditionally
Commit e1de4c1 ("x86/timer: Fix boot on Intel systems using ITSSPRC static PIT clock gating") was reported to cause boot failures on certain AMD Ryzen systems. Until we can figure out what the actual issue there is, skip this new part of HPET setup by default. Introduce a "hpet" command line option to allow enabling this on hardware where it's really needed for Xen to boot successfully (i.e. where the PIT doesn't drive the timer interrupt). Since it makes little sense to introduce just "hpet=legacy-replacement", also allow for a boolean argument as well as "broadcast" to replace the separate "hpetbroadcast" option. Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com> Reviewed-by: Ian Jackson <iwj@xenproject.org> Release-Acked-by: Ian Jackson <iwj@xenproject.org> (cherry picked from commit e680cc4)
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