[PATCH v3 00/14] KVM: arm64: Add KVM_PRE_FAULT_MEMORY support

[Fuad Tabba]

Hi Lorenzo,

On Tue, 22 Sep 2026 15:17:54 +0100, "Lorenzo Stoakes (ARM)"
<ljs at kernel.org> wrote:
> This series implements the KVM stage 2 page table pre-faulting feature for
> arm64.

There's likely going to be a respin for the arch hook, but FWIW,
tested as follows:

QEMU/arm64 -cpu max:
- guests boot on VHE, nVHE and protected-mode hosts, protected guests included
- pre_fault_memory_test (all guest modes, anonymous, THP, hugetlb and
shmem backing) and nv_pre_fault_memory_test pass
- pre-faulting an uninitialised vCPU returns -ENOEXEC
- dirty_log_test, demand_paging_test, mmu_stress_test and
stage2_block_transitions also pass

Apple M4 (nVHE, 4K and 16K pages):
- pre_fault_memory_test passes on the five guest modes available
there, with the same backings
- in protected mode (4K pages), the cap isn't advertised, the ioctl
returns -EOPNOTSUPP, and guests boot

Tested-by: Fuad Tabba <fuad.tabba at linux.dev>

Cheers,
/fuad