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Andrew Cooper
e5ac68a011
I was really hoping to avoid this, but its now too late in the 4.17 freeze and we still don't have working fixes. The in-Xen calculations for assistance capabilities are buggy. For the avoidance of doubt, the original intention was to be able to control every aspect of a APIC acceleration so we could comprehensively test Xen's support, as it has proved to be buggy time and time again. Even after a protracted discussion on what the new API ought to mean, attempts to apply it to the existing logic have been unsuccessful, proving that the API/ABI is too complicated for most people to reason about. This reverts most of:2ce11ce2496b2b9b3405leaving in place the non-APIC specific changes (minimal as they are). This takes us back to the behaviour of Xen 4.16 where APIC acceleration is configured on a per system basis. This work will be revisted in due course. Fixes:2ce11ce249("x86/HVM: allow per-domain usage of hardware virtualized APIC") Fixes:6b2b9b3405("x86: report Interrupt Controller Virtualization capabilities") Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Acked-by: Jan Beulich <jbeulich@suse.com> Release-acked-by: Henry Wang <Henry.Wang@arm.com>