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PCI: hv: Use page allocation for hbus structure 

The hv_pcibus_device structure contains an in-memory hypercall argument
that must not cross a page boundary.  Allocate the structure as a page to
ensure that.

Signed-off-by: Jork Loeser <jloeser@microsoft.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>
This commit is contained in:
Jork Loeser 2017-05-24 13:41:25 -07:00 committed by Bjorn Helgaas
parent 691ac1dc58
commit be66b67365
1 changed files with 12 additions and 3 deletions
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15
drivers/pci/host/pci-hyperv.c
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@ -382,7 +382,10 @@ struct hv_pcibus_device {
struct msi_domain_info msi_info;
struct msi_controller msi_chip;
struct irq_domain *irq_domain;
/* hypercall arg, must not cross page boundary */
struct retarget_msi_interrupt retarget_msi_interrupt_params;
spinlock_t retarget_msi_interrupt_lock;
};
@ -2204,7 +2207,13 @@ static int hv_pci_probe(struct hv_device *hdev,
struct hv_pcibus_device *hbus;
int ret;
hbus = kzalloc(sizeof(*hbus), GFP_KERNEL);
/*
* hv_pcibus_device contains the hypercall arguments for retargeting in
* hv_irq_unmask(). Those must not cross a page boundary.
*/
BUILD_BUG_ON(sizeof(*hbus) > PAGE_SIZE);
hbus = (struct hv_pcibus_device *)get_zeroed_page(GFP_KERNEL);
if (!hbus)
return -ENOMEM;
hbus->state = hv_pcibus_init;
@ -2308,7 +2317,7 @@ free_config:
close:
vmbus_close(hdev->channel);
free_bus:
kfree(hbus);
free_page((unsigned long)hbus);
return ret;
}
@ -2386,7 +2395,7 @@ static int hv_pci_remove(struct hv_device *hdev)
irq_domain_free_fwnode(hbus->sysdata.fwnode);
put_hvpcibus(hbus);
wait_for_completion(&hbus->remove_event);
kfree(hbus);
free_page((unsigned long)hbus);
return 0;
}