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    Subject[PATCH 5.15 066/917] powerpc/kvm: Fix kvm_use_magic_page
    Date
    From: Andreas Gruenbacher <agruenba@redhat.com>

    commit 0c8eb2884a42d992c7726539328b7d3568f22143 upstream.

    When switching from __get_user to fault_in_pages_readable, commit
    9f9eae5ce717 broke kvm_use_magic_page: like __get_user,
    fault_in_pages_readable returns 0 on success.

    Fixes: 9f9eae5ce717 ("powerpc/kvm: Prefer fault_in_pages_readable function")
    Cc: stable@vger.kernel.org # v4.18+
    Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    arch/powerpc/kernel/kvm.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/arch/powerpc/kernel/kvm.c
    +++ b/arch/powerpc/kernel/kvm.c
    @@ -669,7 +669,7 @@ static void __init kvm_use_magic_page(vo
    on_each_cpu(kvm_map_magic_page, &features, 1);

    /* Quick self-test to see if the mapping works */
    - if (!fault_in_pages_readable((const char *)KVM_MAGIC_PAGE, sizeof(u32))) {
    + if (fault_in_pages_readable((const char *)KVM_MAGIC_PAGE, sizeof(u32))) {
    kvm_patching_worked = false;
    return;
    }

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