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authorKhalid Aziz <khalid.aziz@oracle.com>2018-02-23 15:46:41 -0700
committerDavid S. Miller <davem@davemloft.net>2018-03-18 07:38:48 -0700
commit74a04967482faa7144b93dae3b2e913870dd421c (patch)
tree387f2497cfd053d99504a00ff8ccce0dd5fbd647 /arch/sparc/mm/hugetlbpage.c
parenta4602b62d9fdea41412ba765bbf32ecfc2b6a94c (diff)
downloadlinux-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.c14
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)