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authorJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2010-12-13 14:42:30 +0000
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-01-11 14:32:14 -0500
commit87f1d40a706bdebdc8f959b9ac291d0d8fdfcc7e (patch)
tree9c05cb059c6eec2d85effd95642ee1a42b000fbe /arch/x86/include/asm/xen
parenta12b4eb34bb1ea16046c5b61e7a887e252cc1cce (diff)
xen p2m: clear the old pte when adding a page to m2p_override
When adding a page to m2p_override we change the p2m of the page so we need to also clear the old pte of the kernel linear mapping because it doesn't correspond anymore. When we remove the page from m2p_override we restore the original p2m of the page and we also restore the old pte of the kernel linear mapping. Before changing the p2m mappings in m2p_add_override and m2p_remove_override, check that the page passed as argument is valid and return an error if it is not. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/x86/include/asm/xen')
-rw-r--r--arch/x86/include/asm/xen/page.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
index 50f0a0f6bd6a..f25bdf238a33 100644
--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -42,8 +42,8 @@ extern unsigned int machine_to_phys_order;
extern unsigned long get_phys_to_machine(unsigned long pfn);
extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn);
-extern void m2p_add_override(unsigned long mfn, struct page *page);
-extern void m2p_remove_override(struct page *page);
+extern int m2p_add_override(unsigned long mfn, struct page *page);
+extern int m2p_remove_override(struct page *page);
extern struct page *m2p_find_override(unsigned long mfn);
extern unsigned long m2p_find_override_pfn(unsigned long mfn, unsigned long pfn);