To simplify the process of fetching an spte, add a helper that links
a shadow page to an spte.
Reviewed-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxx>
Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
---
arch/x86/kvm/mmu.c | 10 ++++++++++
arch/x86/kvm/paging_tmpl.h | 7 ++-----
2 files changed, 12 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index b93b94f..ae35853 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1482,6 +1482,16 @@ static void shadow_walk_next(struct kvm_shadow_walk_iterator *iterator)
--iterator->level;
}
+static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp)
+{
+ u64 spte;
+
+ spte = __pa(sp->spt)
+ | PT_PRESENT_MASK | PT_ACCESSED_MASK
+ | PT_WRITABLE_MASK | PT_USER_MASK;
+ *sptep = spte;
+}
+
static void kvm_mmu_page_unlink_children(struct kvm *kvm,
struct kvm_mmu_page *sp)
{
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 6daeacf..4606c88 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -309,7 +309,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
{
unsigned access = gw->pt_access;
struct kvm_mmu_page *sp;
- u64 spte, *sptep = NULL;
+ u64 *sptep = NULL;
int direct;
gfn_t table_gfn;
int r;
@@ -394,10 +394,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
}
}
- spte = __pa(sp->spt)
- | PT_PRESENT_MASK | PT_ACCESSED_MASK
- | PT_WRITABLE_MASK | PT_USER_MASK;
- *sptep = spte;
+ link_shadow_page(sptep, sp);
}
return sptep;
--
1.7.1
--
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