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SubjectRe: [PATCH 1/3] PCI: hv: Allocate physically contiguous hypercall params buffer
On Fri, Jan 18, 2019 at 02:17:16AM +0530, Ajay Kaher wrote:
> hv_do_hypercall() assumes that we pass a segment from a physically
> contiguous buffer. A buffer allocated on the stack may not work if
> CONFIG_VMAP_STACK=y is set.
>
> Use kmalloc() to allocate this buffer.
>
> Reported-by: Haiyang Zhang <haiyangz@microsoft.com>
> Signed-off-by: Long Li <longli@microsoft.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

I did not sign off on this; please remove this. Signed-off-by should
only be added by the person mentioned.

> Acked-by: K. Y. Srinivasan <kys@microsoft.com>
> Signed-off-by: Ajay Kaher <akaher@vmware.com>
> ---
> drivers/pci/host/pci-hyperv.c | 29 +++++++++++++++++++----------
> 1 file changed, 19 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c
> index b4d8ccf..9e44adf 100644
> --- a/drivers/pci/host/pci-hyperv.c
> +++ b/drivers/pci/host/pci-hyperv.c
> @@ -383,6 +383,8 @@ struct hv_pcibus_device {
> struct msi_domain_info msi_info;
> struct msi_controller msi_chip;
> struct irq_domain *irq_domain;
> + struct retarget_msi_interrupt retarget_msi_interrupt_params;
> + spinlock_t retarget_msi_interrupt_lock;
> };
>
> /*
> @@ -780,34 +782,40 @@ void hv_irq_unmask(struct irq_data *data)
> {
> struct msi_desc *msi_desc = irq_data_get_msi_desc(data);
> struct irq_cfg *cfg = irqd_cfg(data);
> - struct retarget_msi_interrupt params;
> + struct retarget_msi_interrupt *params;
> struct hv_pcibus_device *hbus;
> struct cpumask *dest;
> struct pci_bus *pbus;
> struct pci_dev *pdev;
> int cpu;
> + unsigned long flags;
>
> dest = irq_data_get_affinity_mask(data);
> pdev = msi_desc_to_pci_dev(msi_desc);
> pbus = pdev->bus;
> hbus = container_of(pbus->sysdata, struct hv_pcibus_device, sysdata);
>
> - memset(&params, 0, sizeof(params));
> - params.partition_id = HV_PARTITION_ID_SELF;
> - params.source = 1; /* MSI(-X) */
> - params.address = msi_desc->msg.address_lo;
> - params.data = msi_desc->msg.data;
> - params.device_id = (hbus->hdev->dev_instance.b[5] << 24) |
> + spin_lock_irqsave(&hbus->retarget_msi_interrupt_lock, flags);
> +
> + params = &hbus->retarget_msi_interrupt_params;
> + memset(params, 0, sizeof(*params));
> + params->partition_id = HV_PARTITION_ID_SELF;
> + params->source = 1; /* MSI(-X) */
> + params->address = msi_desc->msg.address_lo;
> + params->data = msi_desc->msg.data;
> + params->device_id = (hbus->hdev->dev_instance.b[5] << 24) |
> (hbus->hdev->dev_instance.b[4] << 16) |
> (hbus->hdev->dev_instance.b[7] << 8) |
> (hbus->hdev->dev_instance.b[6] & 0xf8) |
> PCI_FUNC(pdev->devfn);
> - params.vector = cfg->vector;
> + params->vector = cfg->vector;
>
> for_each_cpu_and(cpu, dest, cpu_online_mask)
> - params.vp_mask |= (1ULL << vmbus_cpu_number_to_vp_number(cpu));
> + params->vp_mask |= (1ULL << vmbus_cpu_number_to_vp_number(cpu));
> +
> + hv_do_hypercall(HVCALL_RETARGET_INTERRUPT, params, NULL);
>
> - hv_do_hypercall(HVCALL_RETARGET_INTERRUPT, &params, NULL);
> + spin_unlock_irqrestore(&hbus->retarget_msi_interrupt_lock, flags);
>
> pci_msi_unmask_irq(data);
> }
> @@ -2212,6 +2220,7 @@ static int hv_pci_probe(struct hv_device *hdev,
> INIT_LIST_HEAD(&hbus->resources_for_children);
> spin_lock_init(&hbus->config_lock);
> spin_lock_init(&hbus->device_list_lock);
> + spin_lock_init(&hbus->retarget_msi_interrupt_lock);
> sema_init(&hbus->enum_sem, 1);
> init_completion(&hbus->remove_event);
>
> --
> 2.7.4
>

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