[Xen-devel] [PATCH 2/3] xen: Do not pin/unpin PMD pages

[Mark McLoughlin <markmc@xxxxxxxxxx>]

During process startup, in xen_pgd_pin(), we pin PTE pages
but not PMD pages. If we then later map and unmap using an
otherwise unused PMD page, the unpin in release_pd() fails
because it wasn't previously pinned.

i.e. with this simple test case:

    int fd = open("/dev/zero", O_RDONLY);
    munmap(mmap((void *)0x40000000, 0x1000_LEN, PROT_READ, MAP_PRIVATE, fd, 0), 
0x1000);
    close(fd);

we currently get:

   kernel BUG at arch/x86/xen/enlighten.c:678!
   ...
   EIP is at xen_release_pt+0x79/0xa9
   ...
   Call Trace:
    [<c041da25>] ? __pmd_free_tlb+0x1a/0x75
    [<c047a192>] ? free_pgd_range+0x1d2/0x2b5
    [<c047a2f3>] ? free_pgtables+0x7e/0x93
    [<c047b272>] ? unmap_region+0xb9/0xf5
    [<c047c1bd>] ? do_munmap+0x193/0x1f5
    [<c047c24f>] ? sys_munmap+0x30/0x3f
    [<c0408cce>] ? syscall_call+0x7/0xb
    =======================

and xen complains:

  (XEN) mm.c:2241:d4 Mfn 1cc37 not pinned

Further details at:

  https://bugzilla.redhat.com/436453

Signed-off-by: Mark McLoughlin <markmc@xxxxxxxxxx>
---
 arch/x86/xen/enlighten.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 16e2f80..f16b056 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -689,8 +689,6 @@ static void xen_alloc_ptpage(struct mm_struct *mm, u32 pfn, 
unsigned level)
                        make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
                        if (level == PT_PTE)
                                pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
-                       else if (level == PT_PMD)
-                               pin_pagetable_pfn(MMUEXT_PIN_L2_TABLE, pfn);
                } else
                        /* make sure there are no stray mappings of
                           this page */
@@ -715,7 +713,8 @@ static void xen_release_ptpage(u32 pfn, unsigned level)
 
        if (PagePinned(page)) {
                if (!PageHighMem(page)) {
-                       pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
+                       if (level == PT_PTE)
+                               pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
                        make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
                }
        }
-- 
1.5.4.5


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