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Subject[PATCH v2 4/5] KVM: MMU: introduce page_fault_start and page_fault_end
Wrap the common operations into these two functions

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
---
arch/x86/kvm/mmu.c | 53 +++++++++++++++++++++++++++----------------
arch/x86/kvm/paging_tmpl.h | 16 +++++--------
2 files changed, 39 insertions(+), 30 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 29ce28b..7e7b8cd 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2825,6 +2825,29 @@ exit:
static bool try_async_pf(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn,
gva_t gva, pfn_t *pfn, bool write, bool *writable);

+static bool
+page_fault_start(struct kvm_vcpu *vcpu, gfn_t *gfnp, pfn_t *pfnp, int *levelp,
+ bool force_pt_level, unsigned long mmu_seq)
+{
+ spin_lock(&vcpu->kvm->mmu_lock);
+ if (mmu_notifier_retry(vcpu, mmu_seq))
+ return false;
+
+ kvm_mmu_free_some_pages(vcpu);
+ if (likely(!force_pt_level))
+ transparent_hugepage_adjust(vcpu, gfnp, pfnp, levelp);
+
+ return true;
+}
+
+static void page_fault_end(struct kvm_vcpu *vcpu, pfn_t pfn)
+{
+ spin_unlock(&vcpu->kvm->mmu_lock);
+
+ if (!is_error_pfn(pfn))
+ kvm_release_pfn_clean(pfn);
+}
+
static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, u32 error_code,
gfn_t gfn, bool prefault)
{
@@ -2862,22 +2885,17 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, u32 error_code,
if (handle_abnormal_pfn(vcpu, v, gfn, pfn, ACC_ALL, &r))
return r;

- spin_lock(&vcpu->kvm->mmu_lock);
- if (mmu_notifier_retry(vcpu, mmu_seq)) {
+ if (!page_fault_start(vcpu, &gfn, &pfn, &level, force_pt_level,
+ mmu_seq)) {
r = 0;
- goto out_unlock;
+ goto exit;
}

- kvm_mmu_free_some_pages(vcpu);
- if (likely(!force_pt_level))
- transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level);
r = __direct_map(vcpu, v, write, map_writable, level, gfn, pfn,
prefault);

-out_unlock:
- spin_unlock(&vcpu->kvm->mmu_lock);
- if (!is_error_pfn(pfn))
- kvm_release_pfn_clean(pfn);
+exit:
+ page_fault_end(vcpu, pfn);
return r;
}

@@ -3331,22 +3349,17 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa, u32 error_code,
if (handle_abnormal_pfn(vcpu, 0, gfn, pfn, ACC_ALL, &r))
return r;

- spin_lock(&vcpu->kvm->mmu_lock);
- if (mmu_notifier_retry(vcpu, mmu_seq)) {
+ if (!page_fault_start(vcpu, &gfn, &pfn, &level, force_pt_level,
+ mmu_seq)) {
r = 0;
- goto out_unlock;
+ goto exit;
}

- kvm_mmu_free_some_pages(vcpu);
- if (likely(!force_pt_level))
- transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level);
r = __direct_map(vcpu, gpa, write, map_writable,
level, gfn, pfn, prefault);

-out_unlock:
- spin_unlock(&vcpu->kvm->mmu_lock);
- if (!is_error_pfn(pfn))
- kvm_release_pfn_clean(pfn);
+exit:
+ page_fault_end(vcpu, pfn);
return r;
}

diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 0adf376..1a738c5 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -624,26 +624,22 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code,
walker.gfn, pfn, walker.pte_access, &r))
return r;

- spin_lock(&vcpu->kvm->mmu_lock);
- if (mmu_notifier_retry(vcpu, mmu_seq)) {
+ if (!page_fault_start(vcpu, &walker.gfn, &pfn, &level,
+ force_pt_level, mmu_seq)) {
r = 0;
- goto out_unlock;
+ goto exit;
}

kvm_mmu_audit(vcpu, AUDIT_PRE_PAGE_FAULT);
- kvm_mmu_free_some_pages(vcpu);
- if (!force_pt_level)
- transparent_hugepage_adjust(vcpu, &walker.gfn, &pfn, &level);
+
r = FNAME(fetch)(vcpu, addr, &walker, user_fault, write_fault,
level, pfn, map_writable, prefault);

++vcpu->stat.pf_fixed;
kvm_mmu_audit(vcpu, AUDIT_POST_PAGE_FAULT);

-out_unlock:
- spin_unlock(&vcpu->kvm->mmu_lock);
- if (!is_error_pfn(pfn))
- kvm_release_pfn_clean(pfn);
+exit:
+ page_fault_end(vcpu, pfn);
return r;
}

--
1.7.7.6


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