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Subject[PATCH 2 of 8] x86_64: unmap iomapping before populating
Date
From
Xen doesn't like stray writable mappings of pagetable pages, so make
sure the ioremap mapping is removed before attaching the new page to
the pagetable.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---
arch/x86/mm/init_64.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -333,11 +333,11 @@
pmd = alloc_low_page(&pmd_phys);

spin_lock(&init_mm.page_table_lock);
+ last_map_addr = phys_pmd_init(pmd, addr, end);
+ unmap_low_page(pmd);
pud_populate(&init_mm, pud, __va(pmd_phys));
- last_map_addr = phys_pmd_init(pmd, addr, end);
spin_unlock(&init_mm.page_table_lock);

- unmap_low_page(pmd);
}
__flush_tlb_all();
update_page_count(PG_LEVEL_1G, pages);
@@ -534,10 +534,10 @@
if (next > end)
next = end;
last_map_addr = phys_pud_init(pud, __pa(start), __pa(next));
+ unmap_low_page(pud);
if (!after_bootmem)
pgd_populate(&init_mm, pgd_offset_k(start),
__va(pud_phys));
- unmap_low_page(pud);
}

if (!after_bootmem)



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