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    Subject[PATCH 4.9 149/164] PCI: hv: Specify CPU_AFFINITY_ALL for MSI affinity when >= 32 CPUs
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: K. Y. Srinivasan <kys@microsoft.com>

    commit 433fcf6b7b31f1f233dd50aeb9d066a0f6ed4b9d upstream.

    When we have 32 or more CPUs in the affinity mask, we should use a special
    constant to specify that to the host. Fix this issue.

    Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
    Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
    Reviewed-by: Long Li <longli@microsoft.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/pci/host/pci-hyperv.c | 11 ++++++++---
    1 file changed, 8 insertions(+), 3 deletions(-)

    --- a/drivers/pci/host/pci-hyperv.c
    +++ b/drivers/pci/host/pci-hyperv.c
    @@ -72,6 +72,7 @@ enum {
    PCI_PROTOCOL_VERSION_CURRENT = PCI_PROTOCOL_VERSION_1_1
    };

    +#define CPU_AFFINITY_ALL -1ULL
    #define PCI_CONFIG_MMIO_LENGTH 0x2000
    #define CFG_PAGE_OFFSET 0x1000
    #define CFG_PAGE_SIZE (PCI_CONFIG_MMIO_LENGTH - CFG_PAGE_OFFSET)
    @@ -889,9 +890,13 @@ static void hv_compose_msi_msg(struct ir
    * processors because Hyper-V only supports 64 in a guest.
    */
    affinity = irq_data_get_affinity_mask(data);
    - for_each_cpu_and(cpu, affinity, cpu_online_mask) {
    - int_pkt->int_desc.cpu_mask |=
    - (1ULL << vmbus_cpu_number_to_vp_number(cpu));
    + if (cpumask_weight(affinity) >= 32) {
    + int_pkt->int_desc.cpu_mask = CPU_AFFINITY_ALL;
    + } else {
    + for_each_cpu_and(cpu, affinity, cpu_online_mask) {
    + int_pkt->int_desc.cpu_mask |=
    + (1ULL << vmbus_cpu_number_to_vp_number(cpu));
    + }
    }

    ret = vmbus_sendpacket(hpdev->hbus->hdev->channel, int_pkt,

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