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    Subject[PATCH v6 1/4] KVM: x86: Clarify the kvm_run.emulation_failure structure layout
    Date
    Until more flags for kvm_run.emulation_failure flags are defined, it
    is undetermined whether new payload elements corresponding to those
    flags will be additive or alternative. As a hint to userspace that an
    alternative is possible, wrap the current payload elements in a union.

    Suggested-by: Sean Christopherson <seanjc@google.com>
    Signed-off-by: David Edmondson <david.edmondson@oracle.com>
    ---
    include/uapi/linux/kvm.h | 8 ++++++--
    1 file changed, 6 insertions(+), 2 deletions(-)

    diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
    index a067410ebea5..8618fe973215 100644
    --- a/include/uapi/linux/kvm.h
    +++ b/include/uapi/linux/kvm.h
    @@ -402,8 +402,12 @@ struct kvm_run {
    __u32 suberror;
    __u32 ndata;
    __u64 flags;
    - __u8 insn_size;
    - __u8 insn_bytes[15];
    + union {
    + struct {
    + __u8 insn_size;
    + __u8 insn_bytes[15];
    + };
    + };
    } emulation_failure;
    /* KVM_EXIT_OSI */
    struct {
    --
    2.33.0
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