Merge tag 'kvm-x86-guest-6.18' of https://github.com/kvm-x86/linux into HEAD

x86/kvm guest side changes for 6.18

 - For the legacy PCI hole (memory between TOLUD and 4GiB) to UC when
   overriding guest MTRR for TDX/SNP to fix an issue where ACPI auto-mapping
   could map devices as WB and prevent the device drivers from mapping their
   devices with UC/UC-.

 - Make kvm_async_pf_task_wake() a local static helper and remove its
   export.

 - Use native qspinlocks when running in a VM with dedicated vCPU=>pCPU
   bindings even when PV_UNHALT is unsupported.