paravirt: add hooks for ptep_modify_prot_start/commit

This patch adds paravirt-ops hooks in pv_mmu_ops for ptep_modify_prot_start and
ptep_modify_prot_commit.  This allows the hypervisor-specific backends to
implement these in some more efficient way.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 6 insertions, 0 deletions

diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index c98d54688180..f1ab0f727007 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -380,6 +380,9 @@ struct pv_mmu_ops pv_mmu_ops = {
         .pte_update = paravirt_nop,
         .pte_update_defer = paravirt_nop,
 
+        .ptep_modify_prot_start = __ptep_modify_prot_start,
+        .ptep_modify_prot_commit = __ptep_modify_prot_commit,
+
 #ifdef CONFIG_HIGHPTE
         .kmap_atomic_pte = kmap_atomic,
 #endif
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 73fb0c4c150a..0b7553cbc529 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1138,6 +1138,9 @@ static const struct pv_mmu_ops xen_mmu_ops __initdata = {
         .set_pte_at = xen_set_pte_at,
         .set_pmd = xen_set_pmd_hyper,
 
+        .ptep_modify_prot_start = __ptep_modify_prot_start,
+        .ptep_modify_prot_commit = __ptep_modify_prot_commit,
+
         .pte_val = xen_pte_val,
         .pte_flags = native_pte_val,
         .pgd_val = xen_pgd_val,