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    Subject[PATCH v4 01/14] KVM: arm64: Provide {get,put}_page() stubs for early hyp allocator
    From
    In nVHE protected mode, the EL2 code uses a temporary allocator during
    boot while re-creating its stage-1 page-table. Unfortunately, the
    hyp_vmmemap is not ready to use at this stage, so refcounting pages
    is not possible. That is not currently a problem because hyp stage-1
    mappings are never removed, which implies refcounting of page-table
    pages is unnecessary.

    In preparation for allowing hypervisor stage-1 mappings to be removed,
    provide stub implementations for {get,put}_page() in the early allocator.

    Acked-by: Will Deacon <will@kernel.org>
    Signed-off-by: Quentin Perret <qperret@google.com>
    ---
    arch/arm64/kvm/hyp/nvhe/early_alloc.c | 5 +++++
    1 file changed, 5 insertions(+)

    diff --git a/arch/arm64/kvm/hyp/nvhe/early_alloc.c b/arch/arm64/kvm/hyp/nvhe/early_alloc.c
    index 1306c430ab87..00de04153cc6 100644
    --- a/arch/arm64/kvm/hyp/nvhe/early_alloc.c
    +++ b/arch/arm64/kvm/hyp/nvhe/early_alloc.c
    @@ -43,6 +43,9 @@ void *hyp_early_alloc_page(void *arg)
    return hyp_early_alloc_contig(1);
    }

    +static void hyp_early_alloc_get_page(void *addr) { }
    +static void hyp_early_alloc_put_page(void *addr) { }
    +
    void hyp_early_alloc_init(void *virt, unsigned long size)
    {
    base = cur = (unsigned long)virt;
    @@ -51,4 +54,6 @@ void hyp_early_alloc_init(void *virt, unsigned long size)
    hyp_early_alloc_mm_ops.zalloc_page = hyp_early_alloc_page;
    hyp_early_alloc_mm_ops.phys_to_virt = hyp_phys_to_virt;
    hyp_early_alloc_mm_ops.virt_to_phys = hyp_virt_to_phys;
    + hyp_early_alloc_mm_ops.get_page = hyp_early_alloc_get_page;
    + hyp_early_alloc_mm_ops.put_page = hyp_early_alloc_put_page;
    }
    --
    2.34.1.173.g76aa8bc2d0-goog
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