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Date: Fri, 13 Apr 2012 18:10:19 +0800
From: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
CC: Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: [PATCH v2 02/16] KVM: MMU: introduce mmu_spte_establish
It is used to establish the spte if it is not present to cleanup the
code, it also marks spte present before linking it to the sp's
parent_list, then we can integrate the code between rmap walking and
parent_lisk walking in the later patch
Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
---
arch/x86/kvm/mmu.c | 68 +++++++++++++++++++++----------------------
arch/x86/kvm/paging_tmpl.h | 16 ++++------
2 files changed, 40 insertions(+), 44 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 151fcddc..aee13c6 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1368,9 +1368,6 @@ static unsigned kvm_page_table_hashfn(gfn_t gfn)
static void mmu_page_add_parent_pte(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *sp, u64 *parent_pte)
{
- if (!parent_pte)
- return;
-
pte_list_add(vcpu, parent_pte, &sp->parent_ptes);
}
@@ -1401,7 +1398,6 @@ static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu,
list_add(&sp->link, &vcpu->kvm->arch.active_mmu_pages);
bitmap_zero(sp->slot_bitmap, KVM_MEM_SLOTS_NUM);
sp->parent_ptes = 0;
- mmu_page_add_parent_pte(vcpu, sp, parent_pte);
kvm_mod_used_mmu_pages(vcpu->kvm, +1);
return sp;
}
@@ -1765,12 +1761,8 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
if (sp->unsync && kvm_sync_page_transient(vcpu, sp))
break;
- mmu_page_add_parent_pte(vcpu, sp, parent_pte);
- if (sp->unsync_children) {
+ if (sp->unsync_children)
kvm_make_request(KVM_REQ_MMU_SYNC, vcpu);
- kvm_mmu_mark_parents_unsync(sp);
- } else if (sp->unsync)
- kvm_mmu_mark_parents_unsync(sp);
__clear_sp_write_flooding_count(sp);
trace_kvm_mmu_get_page(sp, false);
@@ -1797,6 +1789,35 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
return sp;
}
+static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp)
+{
+ u64 spte;
+
+ spte = __pa(sp->spt) | PT_PRESENT_MASK | PT_WRITABLE_MASK |
+ shadow_user_mask | shadow_x_mask | shadow_accessed_mask;
+
+ mmu_spte_set(sptep, spte);
+}
+
+static struct kvm_mmu_page *
+mmu_spte_establish(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn, gva_t gaddr,
+ unsigned level, int direct, unsigned access)
+{
+ struct kvm_mmu_page *sp;
+
+ WARN_ON(is_shadow_present_pte(*spte));
+
+ sp = kvm_mmu_get_page(vcpu, gfn, gaddr, level, direct, access, spte);
+
+ link_shadow_page(spte, sp);
+ mmu_page_add_parent_pte(vcpu, sp, spte);
+
+ if (sp->unsync_children || sp->unsync)
+ kvm_mmu_mark_parents_unsync(sp);
+
+ return sp;
+}
+
static void shadow_walk_init(struct kvm_shadow_walk_iterator *iterator,
struct kvm_vcpu *vcpu, u64 addr)
{
@@ -1846,16 +1867,6 @@ 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)
-{
- u64 spte;
-
- spte = __pa(sp->spt) | PT_PRESENT_MASK | PT_WRITABLE_MASK |
- shadow_user_mask | shadow_x_mask | shadow_accessed_mask;
-
- mmu_spte_set(sptep, spte);
-}
-
static void drop_large_spte(struct kvm_vcpu *vcpu, u64 *sptep)
{
if (is_large_pte(*sptep)) {
@@ -1921,11 +1932,6 @@ 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;
@@ -2511,7 +2517,6 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write,
bool prefault)
{
struct kvm_shadow_walk_iterator iterator;
- struct kvm_mmu_page *sp;
int emulate = 0;
gfn_t pseudo_gfn;
@@ -2532,16 +2537,9 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write,
base_addr &= PT64_LVL_ADDR_MASK(iterator.level);
pseudo_gfn = base_addr >> PAGE_SHIFT;
- sp = kvm_mmu_get_page(vcpu, pseudo_gfn, iterator.addr,
- iterator.level - 1,
- 1, ACC_ALL, iterator.sptep);
- if (!sp) {
- pgprintk("nonpaging_map: ENOMEM\n");
- kvm_release_pfn_clean(pfn);
- return -ENOMEM;
- }
-
- link_shadow_page(iterator.sptep, sp);
+ mmu_spte_establish(vcpu, iterator.sptep, pseudo_gfn,
+ iterator.addr, iterator.level - 1,
+ 1, ACC_ALL);
}
}
return emulate;
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index df5a703..e3cf43b 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -503,8 +503,9 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
sp = NULL;
if (!is_shadow_present_pte(*it.sptep)) {
table_gfn = gw->table_gfn[it.level - 2];
- sp = kvm_mmu_get_page(vcpu, table_gfn, addr, it.level-1,
- false, access, it.sptep);
+ sp = mmu_spte_establish(vcpu, it.sptep, table_gfn,
+ addr, it.level-1, false,
+ access);
}
/*
@@ -513,9 +514,6 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
*/
if (FNAME(gpte_changed)(vcpu, gw, it.level - 1))
goto out_gpte_changed;
-
- if (sp)
- link_shadow_page(it.sptep, sp);
}
for (;
@@ -533,9 +531,8 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
direct_gfn = gw->gfn & ~(KVM_PAGES_PER_HPAGE(it.level) - 1);
- sp = kvm_mmu_get_page(vcpu, direct_gfn, addr, it.level-1,
- true, direct_access, it.sptep);
- link_shadow_page(it.sptep, sp);
+ mmu_spte_establish(vcpu, it.sptep, direct_gfn, addr, it.level-1,
+ true, direct_access);
}
clear_sp_write_flooding_count(it.sptep);
@@ -548,7 +545,8 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
out_gpte_changed:
if (sp)
- kvm_mmu_put_page(sp, it.sptep);
+ drop_parent_pte(sp, it.sptep);
+
kvm_release_pfn_clean(pfn);
return NULL;
}
--
1.7.7.6
--
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