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| author | Alex Williamson <alex.williamson@redhat.com> | 2013-06-21 09:38:11 -0600 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2013-06-21 09:38:11 -0600 |
| commit | 5c6c2b21ecc9adfc47cfaf93404937b6ecd8395d (patch) | |
| tree | e1ca8d286dcb07f99113924c90188000c01b1ad4 /drivers/vfio | |
| parent | 166fd7d94afdac040b28c473e45241820ca522a2 (diff) | |
| download | linux-5c6c2b21ecc9adfc47cfaf93404937b6ecd8395d.tar.bz2 | |
vfio: Provide module option to disable vfio_iommu_type1 hugepage support
Add a module option to vfio_iommu_type1 to disable IOMMU hugepage
support. This causes iommu_map to only be called with single page
mappings, disabling the IOMMU driver's ability to use hugepages.
This option can be enabled by loading vfio_iommu_type1 with
disable_hugepages=1 or dynamically through sysfs. If enabled
dynamically, only new mappings are restricted.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio')
| -rw-r--r-- | drivers/vfio/vfio_iommu_type1.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 6654a7eb42d3..8a2be4e40f22 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -48,6 +48,12 @@ module_param_named(allow_unsafe_interrupts, MODULE_PARM_DESC(allow_unsafe_interrupts, "Enable VFIO IOMMU support for on platforms without interrupt remapping support."); +static bool disable_hugepages; +module_param_named(disable_hugepages, + disable_hugepages, bool, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(disable_hugepages, + "Disable VFIO IOMMU support for IOMMU hugepages."); + struct vfio_iommu { struct iommu_domain *domain; struct mutex lock; @@ -270,6 +276,11 @@ static long vfio_pin_pages(unsigned long vaddr, long npage, return -ENOMEM; } + if (unlikely(disable_hugepages)) { + vfio_lock_acct(1); + return 1; + } + /* Lock all the consecutive pages from pfn_base */ for (i = 1, vaddr += PAGE_SIZE; i < npage; i++, vaddr += PAGE_SIZE) { unsigned long pfn = 0; |