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    Subject[074/136] KVM: fix cpuid E2BIG handling for extended request types

    2.6.31-stable review patch. If anyone has any objections, please let us know.

    ------------------
    From: Mark McLoughlin <markmc@redhat.com>

    (cherry picked from commit cb007648de83cf226d69ec76e1c01848b4e8e49f)

    If we run out of cpuid entries for extended request types
    we should return -E2BIG, just like we do for the standard
    request types.

    Signed-off-by: Mark McLoughlin <markmc@redhat.com>
    Signed-off-by: Avi Kivity <avi@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    arch/x86/kvm/x86.c | 4 ++++
    1 file changed, 4 insertions(+)

    --- a/arch/x86/kvm/x86.c
    +++ b/arch/x86/kvm/x86.c
    @@ -1448,6 +1448,10 @@ static int kvm_dev_ioctl_get_supported_c
    for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
    do_cpuid_ent(&cpuid_entries[nent], func, 0,
    &nent, cpuid->nent);
    + r = -E2BIG;
    + if (nent >= cpuid->nent)
    + goto out_free;
    +
    r = -EFAULT;
    if (copy_to_user(entries, cpuid_entries,
    nent * sizeof(struct kvm_cpuid_entry2)))



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