From: Stefano Stabellini Date: Fri, 10 Dec 2010 14:52:45 +0000 (+0000) Subject: xen p2m: transparently change the p2m mappings in the m2p override X-Git-Tag: upstream/snapshot3+hdmi~11737^2~4 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9b705f0e98c489b18ba22a6eab9d694b546c8552;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git xen p2m: transparently change the p2m mappings in the m2p override In m2p_add_override store the original mfn into page->index and then change the p2m mapping, setting mfns as FOREIGN_FRAME. In m2p_remove_override restore the original mapping. Signed-off-by: Stefano Stabellini Signed-off-by: Konrad Rzeszutek Wilk --- diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c index 8db19d5..b3b19d4 100644 --- a/arch/x86/xen/p2m.c +++ b/arch/x86/xen/p2m.c @@ -407,8 +407,11 @@ static unsigned long mfn_hash(unsigned long mfn) void m2p_add_override(unsigned long mfn, struct page *page) { unsigned long flags; + unsigned long pfn = page_to_pfn(page); page->private = mfn; + page->index = pfn_to_mfn(pfn); + __set_phys_to_machine(pfn, FOREIGN_FRAME(mfn)); spin_lock_irqsave(&m2p_override_lock, flags); list_add(&page->lru, &m2p_overrides[mfn_hash(mfn)]); spin_unlock_irqrestore(&m2p_override_lock, flags); @@ -417,9 +420,18 @@ void m2p_add_override(unsigned long mfn, struct page *page) void m2p_remove_override(struct page *page) { unsigned long flags; + unsigned long mfn; + unsigned long pfn; + + pfn = page_to_pfn(page); + mfn = get_phys_to_machine(pfn); + if (mfn == INVALID_P2M_ENTRY || !(mfn & FOREIGN_FRAME_BIT)) + return; + spin_lock_irqsave(&m2p_override_lock, flags); list_del(&page->lru); spin_unlock_irqrestore(&m2p_override_lock, flags); + __set_phys_to_machine(pfn, page->index); } struct page *m2p_find_override(unsigned long mfn)