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author | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-03-30 20:47:40 +0200 |
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committer | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-10-22 21:57:31 +0200 |
commit | 41f2e4771a4f1ba26c35438daf32917b9ef7858d (patch) | |
tree | 94a0af183907bc2f646bcde12072c960da987f65 /arch/x86/xen/xen-ops.h | |
parent | xen: make sure xen_max_p2m_pfn is up to date (diff) | |
download | linux-41f2e4771a4f1ba26c35438daf32917b9ef7858d.tar.xz linux-41f2e4771a4f1ba26c35438daf32917b9ef7858d.zip |
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.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h index d505e98e03f8..64044747348e 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); |