static __user void *mpx_get_bounds_dir(void)
{
const struct bndcsr *bndcsr;
if (!cpu_feature_enabled(X86_FEATURE_MPX))
return MPX_INVALID_BOUNDS_DIR;
/*
* The bounds directory pointer is stored in a register
* only accessible if we first do an xsave.
*/
bndcsr = get_xsave_field_ptr(XSTATE_BNDCSR);
if (!bndcsr)
return MPX_INVALID_BOUNDS_DIR;
/*
* Make sure the register looks valid by checking the
* enable bit.
*/
if (!(bndcsr->bndcfgu & MPX_BNDCFG_ENABLE_FLAG))
return MPX_INVALID_BOUNDS_DIR;
/*
* Lastly, mask off the low bits used for configuration
* flags, and return the address of the bounds table.
*/
return (void __user *)(unsigned long)
(bndcsr->bndcfgu & MPX_BNDCFG_ADDR_MASK);
}
int mpx_disable_management(void)
{
struct mm_struct *mm = current->mm;
if (!cpu_feature_enabled(X86_FEATURE_MPX))
return -ENXIO;
down_write(&mm->mmap_sem);
mm->bd_addr = MPX_INVALID_BOUNDS_DIR;
up_write(&mm->mmap_sem);
return 0;
}
int intel_svm_init(struct intel_iommu *iommu)
{
struct page *pages;
int order;
if (cpu_feature_enabled(X86_FEATURE_GBPAGES) &&
!cap_fl1gp_support(iommu->cap))
return -EINVAL;
if (cpu_feature_enabled(X86_FEATURE_LA57) &&
!cap_5lp_support(iommu->cap))
return -EINVAL;
/* Start at 2 because it's defined as 2^(1+PSS) */
iommu->pasid_max = 2 << ecap_pss(iommu->ecap);
/* Eventually I'm promised we will get a multi-level PASID table
* and it won't have to be physically contiguous. Until then,
* limit the size because 8MiB contiguous allocations can be hard
* to come by. The limit of 0x20000, which is 1MiB for each of
* the PASID and PASID-state tables, is somewhat arbitrary. */
if (iommu->pasid_max > 0x20000)
iommu->pasid_max = 0x20000;
order = get_order(sizeof(struct pasid_entry) * iommu->pasid_max);
if (ecap_dis(iommu->ecap)) {
/* Just making it explicit... */
BUILD_BUG_ON(sizeof(struct pasid_entry) != sizeof(struct pasid_state_entry));
pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
if (pages)
iommu->pasid_state_table = page_address(pages);
else
pr_warn("IOMMU: %s: Failed to allocate PASID state table\n",
iommu->name);
}
return 0;
}
