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| author | Khalid Aziz <khalid.aziz@oracle.com> | 2018-02-23 15:46:41 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-03-18 07:38:48 -0700 |
| commit | 74a04967482faa7144b93dae3b2e913870dd421c (patch) | |
| tree | 387f2497cfd053d99504a00ff8ccce0dd5fbd647 /arch/sparc/mm/hugetlbpage.c | |
| parent | a4602b62d9fdea41412ba765bbf32ecfc2b6a94c (diff) | |
| download | linux-74a04967482faa7144b93dae3b2e913870dd421c.tar.bz2 | |
sparc64: Add support for ADI (Application Data Integrity)
ADI is a new feature supported on SPARC M7 and newer processors to allow
hardware to catch rogue accesses to memory. ADI is supported for data
fetches only and not instruction fetches. An app can enable ADI on its
data pages, set version tags on them and use versioned addresses to
access the data pages. Upper bits of the address contain the version
tag. On M7 processors, upper four bits (bits 63-60) contain the version
tag. If a rogue app attempts to access ADI enabled data pages, its
access is blocked and processor generates an exception. Please see
Documentation/sparc/adi.txt for further details.
This patch extends mprotect to enable ADI (TSTATE.mcde), enable/disable
MCD (Memory Corruption Detection) on selected memory ranges, enable
TTE.mcd in PTEs, return ADI parameters to userspace and save/restore ADI
version tags on page swap out/in or migration. ADI is not enabled by
default for any task. A task must explicitly enable ADI on a memory
range and set version tag for ADI to be effective for the task.
Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Khalid Aziz <khalid@gonehiking.org>
Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/mm/hugetlbpage.c')
| -rw-r--r-- | arch/sparc/mm/hugetlbpage.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c index 0112d6942288..f78793a06bbd 100644 --- a/arch/sparc/mm/hugetlbpage.c +++ b/arch/sparc/mm/hugetlbpage.c @@ -182,8 +182,20 @@ pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma, struct page *page, int writeable) { unsigned int shift = huge_page_shift(hstate_vma(vma)); + pte_t pte; - return hugepage_shift_to_tte(entry, shift); + pte = hugepage_shift_to_tte(entry, shift); + +#ifdef CONFIG_SPARC64 + /* If this vma has ADI enabled on it, turn on TTE.mcd + */ + if (vma->vm_flags & VM_SPARC_ADI) + return pte_mkmcd(pte); + else + return pte_mknotmcd(pte); +#else + return pte; +#endif } static unsigned int sun4v_huge_tte_to_shift(pte_t entry) |