KVM: x86: fix sending PV IPI

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2074832



commit c15e0ae4
Author: Li RongQing <lirongqing@baidu.com>
Date:   Wed Mar 9 16:35:44 2022 +0800

    KVM: x86: fix sending PV IPI

    If apic_id is less than min, and (max - apic_id) is greater than
    KVM_IPI_CLUSTER_SIZE, then the third check condition is satisfied but
    the new apic_id does not fit the bitmask.  In this case __send_ipi_mask
    should send the IPI.

    This is mostly theoretical, but it can happen if the apic_ids on three
    iterations of the loop are for example 1, KVM_IPI_CLUSTER_SIZE, 0.

    Fixes: aaffcfd1 ("KVM: X86: Implement PV IPIs in linux guest")
Signed-off-by: Li RongQing <lirongqing@baidu.com>
    Message-Id: <1646814944-51801-1-git-send-email-lirongqing@baidu.com>
    Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>