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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2014-02-03 15:43:59 +0400 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2014-02-03 15:44:49 +0400 |
| commit | e85fc9805591a17ca8af50023ee8e2b61d9a123b (patch) | |
| tree | 95fbacb38701217f001adefa0abe6f8b65c5ce84 /arch/x86/xen/p2m.c | |
| parent | f93576e1ac34fd7a93d6f3432e71295bbe6a27ce (diff) | |
| download | linux-e85fc9805591a17ca8af50023ee8e2b61d9a123b.tar.xz | |
Revert "xen/grant-table: Avoid m2p_override during mapping"
This reverts commit 08ece5bb2312b4510b161a6ef6682f37f4eac8a1.
As it breaks ARM builds and needs more attention
on the ARM side.
Acked-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/x86/xen/p2m.c')
| -rw-r--r-- | arch/x86/xen/p2m.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c index 8009acbe41e4..696c694986d0 100644 --- a/arch/x86/xen/p2m.c +++ b/arch/x86/xen/p2m.c @@ -899,6 +899,13 @@ int m2p_add_override(unsigned long mfn, struct page *page, "m2p_add_override: pfn %lx not mapped", pfn)) return -EINVAL; } + WARN_ON(PagePrivate(page)); + SetPagePrivate(page); + set_page_private(page, mfn); + page->index = pfn_to_mfn(pfn); + + if (unlikely(!set_phys_to_machine(pfn, FOREIGN_FRAME(mfn)))) + return -ENOMEM; if (kmap_op != NULL) { if (!PageHighMem(page)) { @@ -937,16 +944,19 @@ int m2p_add_override(unsigned long mfn, struct page *page, } EXPORT_SYMBOL_GPL(m2p_add_override); int m2p_remove_override(struct page *page, - struct gnttab_map_grant_ref *kmap_op, - unsigned long mfn) + struct gnttab_map_grant_ref *kmap_op) { unsigned long flags; + unsigned long mfn; unsigned long pfn; unsigned long uninitialized_var(address); unsigned level; pte_t *ptep = NULL; pfn = page_to_pfn(page); + mfn = get_phys_to_machine(pfn); + if (mfn == INVALID_P2M_ENTRY || !(mfn & FOREIGN_FRAME_BIT)) + return -EINVAL; if (!PageHighMem(page)) { address = (unsigned long)__va(pfn << PAGE_SHIFT); @@ -960,7 +970,10 @@ int m2p_remove_override(struct page *page, spin_lock_irqsave(&m2p_override_lock, flags); list_del(&page->lru); spin_unlock_irqrestore(&m2p_override_lock, flags); + WARN_ON(!PagePrivate(page)); + ClearPagePrivate(page); + set_phys_to_machine(pfn, page->index); if (kmap_op != NULL) { if (!PageHighMem(page)) { struct multicall_space mcs; |