For stable-6.6.
("x86/xen: fix memblock_reserve() usage on PVH") is the fix, but it depends on ("x86/xen: move xen_reserve_extra_memory()") as a prerequisite. Both need fixups as they predate the removal of the Xen hypercall_page.
Roger Pau Monne (2): x86/xen: move xen_reserve_extra_memory() x86/xen: fix memblock_reserve() usage on PVH
arch/x86/include/asm/xen/hypervisor.h | 5 -- arch/x86/platform/pvh/enlighten.c | 3 - arch/x86/xen/enlighten_pvh.c | 93 +++++++++++++++------------ 3 files changed, 51 insertions(+), 50 deletions(-)