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authorJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2010-03-30 11:47:40 -0700
committerJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2010-10-22 12:57:31 -0700
commit41f2e4771a4f1ba26c35438daf32917b9ef7858d (patch)
tree94a0af183907bc2f646bcde12072c960da987f65 /arch/x86/xen/xen-ops.h
parent2f7acb208523a3bf5f1830f01c29f7feda045169 (diff)
xen: add support for PAT
Convert Linux PAT entries into Xen ones when constructing ptes. Linux doesn't use _PAGE_PAT for ptes, so the only difference in the first 4 entries is that Linux uses _PAGE_PWT for WC, whereas Xen (and default) use it for WT. xen_pte_val does the inverse conversion. We hard-code assumptions about Linux's current PAT layout, but a warning on the wrmsr to MSR_IA32_CR_PAT should point out any problems. If necessary we could go to a more general table-based conversion between Linux and Xen PAT entries. hugetlbfs poses a problem at the moment, the x86 architecture uses the same flag for _PAGE_PAT and _PAGE_PSE, which changes meaning depending on which pagetable level we're using. At the moment this should be OK so long as nobody tries to do a pte_val on a hugetlbfs pte. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Diffstat (limited to 'arch/x86/xen/xen-ops.h')
-rw-r--r--arch/x86/xen/xen-ops.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index d505e98e03f..64044747348 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -32,6 +32,8 @@ void xen_ident_map_ISA(void);
void xen_reserve_top(void);
extern unsigned long xen_max_p2m_pfn;
+void xen_set_pat(u64);
+
char * __init xen_memory_setup(void);
void __init xen_arch_setup(void);
void __init xen_init_IRQ(void);