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author | Jan Beulich <jbeulich@suse.com> | 2013-01-23 14:03:25 +0100 |
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committer | Jan Beulich <jbeulich@suse.com> | 2013-01-23 14:03:25 +0100 |
commit | a2fd3bc4d44f1fca34fcfcff843b1eb940dc2c9a (patch) | |
tree | 169e29c47186cc749f0f60bb2d1d854d0c6400f7 /xen/arch/x86/x86_64/mm.c | |
parent | 3fc87c0c65f83cc613726b2c33942a19715f4289 (diff) | |
download | xen-a2fd3bc4d44f1fca34fcfcff843b1eb940dc2c9a.tar.gz xen-a2fd3bc4d44f1fca34fcfcff843b1eb940dc2c9a.tar.bz2 xen-a2fd3bc4d44f1fca34fcfcff843b1eb940dc2c9a.zip |
x86: introduce virt_to_xen_l1e()
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
Diffstat (limited to 'xen/arch/x86/x86_64/mm.c')
-rw-r--r-- | xen/arch/x86/x86_64/mm.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c index 5acad4870f..333f57a556 100644 --- a/xen/arch/x86/x86_64/mm.c +++ b/xen/arch/x86/x86_64/mm.c @@ -121,6 +121,28 @@ l2_pgentry_t *virt_to_xen_l2e(unsigned long v) return l3e_to_l2e(*pl3e) + l2_table_offset(v); } +l1_pgentry_t *virt_to_xen_l1e(unsigned long v) +{ + l2_pgentry_t *pl2e; + + pl2e = virt_to_xen_l2e(v); + if ( !pl2e ) + return NULL; + + if ( !(l2e_get_flags(*pl2e) & _PAGE_PRESENT) ) + { + l1_pgentry_t *pl1e = alloc_xen_pagetable(); + + if ( !pl1e ) + return NULL; + clear_page(pl1e); + l2e_write(pl2e, l2e_from_paddr(__pa(pl1e), __PAGE_HYPERVISOR)); + } + + BUG_ON(l2e_get_flags(*pl2e) & _PAGE_PSE); + return l2e_to_l1e(*pl2e) + l1_table_offset(v); +} + void *do_page_walk(struct vcpu *v, unsigned long addr) { unsigned long mfn = pagetable_get_pfn(v->arch.guest_table); |