diff options
Diffstat (limited to 'drivers/vfio')
| -rw-r--r-- | drivers/vfio/vfio.c | 102 | ||||
| -rw-r--r-- | drivers/vfio/vfio_iommu_type1.c | 20 |
2 files changed, 112 insertions, 10 deletions
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index 2e83bdf..bd36c16 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -1799,6 +1799,108 @@ void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset) } EXPORT_SYMBOL_GPL(vfio_info_cap_shift); + +/* + * Pin a set of guest PFNs and return their associated host PFNs for local + * domain only. + * @dev [in] : device + * @user_pfn [in]: array of user/guest PFNs to be unpinned. + * @npage [in] : count of elements in user_pfn array. This count should not + * be greater VFIO_PIN_PAGES_MAX_ENTRIES. + * @prot [in] : protection flags + * @phys_pfn[out]: array of host PFNs + * Return error or number of pages pinned. + */ +int vfio_pin_pages(struct device *dev, unsigned long *user_pfn, int npage, + int prot, unsigned long *phys_pfn) +{ + struct vfio_container *container; + struct vfio_group *group; + struct vfio_iommu_driver *driver; + int ret; + + if (!dev || !user_pfn || !phys_pfn || !npage) + return -EINVAL; + + if (npage > VFIO_PIN_PAGES_MAX_ENTRIES) + return -E2BIG; + + group = vfio_group_get_from_dev(dev); + if (IS_ERR(group)) + return PTR_ERR(group); + + ret = vfio_group_add_container_user(group); + if (ret) + goto err_pin_pages; + + container = group->container; + down_read(&container->group_lock); + + driver = container->iommu_driver; + if (likely(driver && driver->ops->pin_pages)) + ret = driver->ops->pin_pages(container->iommu_data, user_pfn, + npage, prot, phys_pfn); + else + ret = -ENOTTY; + + up_read(&container->group_lock); + vfio_group_try_dissolve_container(group); + +err_pin_pages: + vfio_group_put(group); + return ret; +} +EXPORT_SYMBOL(vfio_pin_pages); + +/* + * Unpin set of host PFNs for local domain only. + * @dev [in] : device + * @user_pfn [in]: array of user/guest PFNs to be unpinned. Number of user/guest + * PFNs should not be greater than VFIO_PIN_PAGES_MAX_ENTRIES. + * @npage [in] : count of elements in user_pfn array. This count should not + * be greater than VFIO_PIN_PAGES_MAX_ENTRIES. + * Return error or number of pages unpinned. + */ +int vfio_unpin_pages(struct device *dev, unsigned long *user_pfn, int npage) +{ + struct vfio_container *container; + struct vfio_group *group; + struct vfio_iommu_driver *driver; + int ret; + + if (!dev || !user_pfn || !npage) + return -EINVAL; + + if (npage > VFIO_PIN_PAGES_MAX_ENTRIES) + return -E2BIG; + + group = vfio_group_get_from_dev(dev); + if (IS_ERR(group)) + return PTR_ERR(group); + + ret = vfio_group_add_container_user(group); + if (ret) + goto err_unpin_pages; + + container = group->container; + down_read(&container->group_lock); + + driver = container->iommu_driver; + if (likely(driver && driver->ops->unpin_pages)) + ret = driver->ops->unpin_pages(container->iommu_data, user_pfn, + npage); + else + ret = -ENOTTY; + + up_read(&container->group_lock); + vfio_group_try_dissolve_container(group); + +err_unpin_pages: + vfio_group_put(group); + return ret; +} +EXPORT_SYMBOL(vfio_unpin_pages); + /** * Module/class support */ diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 2ba1942..9f3d58d 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -259,8 +259,8 @@ static int vaddr_get_pfn(unsigned long vaddr, int prot, unsigned long *pfn) * the iommu can only map chunks of consecutive pfns anyway, so get the * first page and all consecutive pages with the same locking. */ -static long vfio_pin_pages(unsigned long vaddr, long npage, - int prot, unsigned long *pfn_base) +static long vfio_pin_pages_remote(unsigned long vaddr, long npage, + int prot, unsigned long *pfn_base) { unsigned long limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; bool lock_cap = capable(CAP_IPC_LOCK); @@ -318,8 +318,8 @@ static long vfio_pin_pages(unsigned long vaddr, long npage, return i; } -static long vfio_unpin_pages(unsigned long pfn, long npage, - int prot, bool do_accounting) +static long vfio_unpin_pages_remote(unsigned long pfn, long npage, + int prot, bool do_accounting) { unsigned long unlocked = 0; long i; @@ -382,9 +382,9 @@ static void vfio_unmap_unpin(struct vfio_iommu *iommu, struct vfio_dma *dma) if (WARN_ON(!unmapped)) break; - unlocked += vfio_unpin_pages(phys >> PAGE_SHIFT, - unmapped >> PAGE_SHIFT, - dma->prot, false); + unlocked += vfio_unpin_pages_remote(phys >> PAGE_SHIFT, + unmapped >> PAGE_SHIFT, + dma->prot, false); iova += unmapped; cond_resched(); @@ -613,8 +613,8 @@ static int vfio_dma_do_map(struct vfio_iommu *iommu, while (size) { /* Pin a contiguous chunk of memory */ - npage = vfio_pin_pages(vaddr + dma->size, - size >> PAGE_SHIFT, prot, &pfn); + npage = vfio_pin_pages_remote(vaddr + dma->size, + size >> PAGE_SHIFT, prot, &pfn); if (npage <= 0) { WARN_ON(!npage); ret = (int)npage; @@ -624,7 +624,7 @@ static int vfio_dma_do_map(struct vfio_iommu *iommu, /* Map it! */ ret = vfio_iommu_map(iommu, iova + dma->size, pfn, npage, prot); if (ret) { - vfio_unpin_pages(pfn, npage, prot, true); + vfio_unpin_pages_remote(pfn, npage, prot, true); break; } |
