Every time kvm_mmu_get_page() is called with a non-NULL parent_pte
argument, link_shadow_page() follows that to set the parent entry so
that the new mapping will point to the returned page table.
Moving parent_pte handling there allows to clean up the code because
parent_pte is passed to kvm_mmu_get_page() just for mark_unsync() and
mmu_page_add_parent_pte().
Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya...@lab.ntt.co.jp>
---
arch/x86/kvm/mmu.c | 21 ++++++++-------------
arch/x86/kvm/paging_tmpl.h | 6 ++----
2 files changed, 10 insertions(+), 17 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 9273cd4..33fe720 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2108,14 +2108,9 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct
kvm_vcpu *vcpu,
if (sp->unsync_children) {
kvm_make_request(KVM_REQ_MMU_SYNC, vcpu);
kvm_mmu_mark_parents_unsync(sp);
- if (parent_pte)
- mark_unsync(parent_pte);
} else if (sp->unsync) {
kvm_mmu_mark_parents_unsync(sp);
- if (parent_pte)
- mark_unsync(parent_pte);
}
- mmu_page_add_parent_pte(vcpu, sp, parent_pte);
__clear_sp_write_flooding_count(sp);
trace_kvm_mmu_get_page(sp, false);
@@ -2127,7 +2122,6 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct
kvm_vcpu *vcpu,
sp = kvm_mmu_alloc_page(vcpu, direct);
sp->parent_ptes.val = 0;
- mmu_page_add_parent_pte(vcpu, sp, parent_pte);
sp->gfn = gfn;
sp->role = role;
@@ -2196,7 +2190,8 @@ static void shadow_walk_next(struct
kvm_shadow_walk_iterator *iterator)
return __shadow_walk_next(iterator, *iterator->sptep);
}
-static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp, bool
accessed)
+static void link_shadow_page(struct kvm_vcpu *vcpu, u64 *sptep,
+ struct kvm_mmu_page *sp, bool accessed)
{
u64 spte;
@@ -2210,6 +2205,11 @@ static void link_shadow_page(u64 *sptep, struct
kvm_mmu_page *sp, bool accessed)
spte |= shadow_accessed_mask;
mmu_spte_set(sptep, spte);
+
+ if (sp->unsync_children || sp->unsync)
+ mark_unsync(sptep);
+
+ mmu_page_add_parent_pte(vcpu, sp, sptep);
}
static void validate_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep,
@@ -2268,11 +2268,6 @@ static void kvm_mmu_page_unlink_children(struct kvm *kvm,
mmu_page_zap_pte(kvm, sp, sp->spt + i);
}
-static void kvm_mmu_put_page(struct kvm_mmu_page *sp, u64 *parent_pte)
-{
- mmu_page_remove_parent_pte(sp, parent_pte);
-}
-
static void kvm_mmu_unlink_parents(struct kvm *kvm, struct kvm_mmu_page *sp)
{
u64 *sptep;
@@ -2738,7 +2733,7 @@ static int __direct_map(struct kvm_vcpu *vcpu, int write,
int map_writable,
iterator.level - 1,
1, ACC_ALL, iterator.sptep);
- link_shadow_page(iterator.sptep, sp, true);
+ link_shadow_page(vcpu, iterator.sptep, sp, true);
}
}
return emulate;
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 9d21b44..f414ca6 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -598,7 +598,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
goto out_gpte_changed;
if (sp)
- link_shadow_page(it.sptep, sp, PT_GUEST_ACCESSED_MASK);
+ link_shadow_page(vcpu, it.sptep, sp,
PT_GUEST_ACCESSED_MASK);
}
for (;
@@ -618,7 +618,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
sp = kvm_mmu_get_page(vcpu, direct_gfn, addr, it.level-1,
true, direct_access, it.sptep);
- link_shadow_page(it.sptep, sp, PT_GUEST_ACCESSED_MASK);
+ link_shadow_page(vcpu, it.sptep, sp, PT_GUEST_ACCESSED_MASK);
}
clear_sp_write_flooding_count(it.sptep);
@@ -629,8 +629,6 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
return emulate;
out_gpte_changed:
- if (sp)
- kvm_mmu_put_page(sp, it.sptep);
kvm_release_pfn_clean(pfn);
return 0;
}
--
2.1.0
--
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