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Message-ID: <5052FF9F.5070400@linux.vnet.ibm.com>
Date: Fri, 14 Sep 2012 17:57:51 +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 2/5] KVM: MMU: do not release pfn in mmu_set_spte
It helps us to cleanup release pfn in the later patches
Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
---
arch/x86/kvm/mmu.c | 29 ++++++++++++++---------------
arch/x86/kvm/paging_tmpl.h | 18 +++++++++++-------
2 files changed, 25 insertions(+), 22 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index f74c63a..29ce28b 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2496,9 +2496,6 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
rmap_recycle(vcpu, sptep, gfn);
}
}
-
- if (!is_error_pfn(pfn))
- kvm_release_pfn_clean(pfn);
}
static void nonpaging_new_cr3(struct kvm_vcpu *vcpu)
@@ -2535,12 +2532,15 @@ static int direct_pte_prefetch_many(struct kvm_vcpu *vcpu,
if (ret <= 0)
return -1;
- for (i = 0; i < ret; i++, gfn++, start++)
+ for (i = 0; i < ret; i++, gfn++, start++) {
mmu_set_spte(vcpu, start, ACC_ALL,
access, 0, 0, NULL,
sp->role.level, gfn,
page_to_pfn(pages[i]), true, true);
+ kvm_release_page_clean(pages[i]);
+ }
+
return 0;
}
@@ -2863,23 +2863,22 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, u32 error_code,
return r;
spin_lock(&vcpu->kvm->mmu_lock);
- if (mmu_notifier_retry(vcpu, mmu_seq))
+ if (mmu_notifier_retry(vcpu, mmu_seq)) {
+ r = 0;
goto out_unlock;
+ }
+
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);
- spin_unlock(&vcpu->kvm->mmu_lock);
-
-
- return r;
out_unlock:
spin_unlock(&vcpu->kvm->mmu_lock);
if (!is_error_pfn(pfn))
kvm_release_pfn_clean(pfn);
- return 0;
+ return r;
}
@@ -3333,22 +3332,22 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa, u32 error_code,
return r;
spin_lock(&vcpu->kvm->mmu_lock);
- if (mmu_notifier_retry(vcpu, mmu_seq))
+ if (mmu_notifier_retry(vcpu, mmu_seq)) {
+ r = 0;
goto out_unlock;
+ }
+
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);
- spin_unlock(&vcpu->kvm->mmu_lock);
-
- return r;
out_unlock:
spin_unlock(&vcpu->kvm->mmu_lock);
if (!is_error_pfn(pfn))
kvm_release_pfn_clean(pfn);
- return 0;
+ return r;
}
static void nonpaging_free(struct kvm_vcpu *vcpu)
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index c004ab6..92f466c 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -380,6 +380,9 @@ static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
mmu_set_spte(vcpu, spte, sp->role.access, pte_access, 0, 0,
NULL, PT_PAGE_TABLE_LEVEL,
gpte_to_gfn(gpte), pfn, true, true);
+
+ if (!is_error_pfn(pfn))
+ kvm_release_pfn_clean(pfn);
}
static bool FNAME(gpte_changed)(struct kvm_vcpu *vcpu,
@@ -452,6 +455,8 @@ static void FNAME(pte_prefetch)(struct kvm_vcpu *vcpu, struct guest_walker *gw,
mmu_set_spte(vcpu, spte, sp->role.access, pte_access, 0, 0,
NULL, PT_PAGE_TABLE_LEVEL, gfn,
pfn, true, true);
+ if (!is_error_pfn(pfn))
+ kvm_release_pfn_clean(pfn);
}
}
@@ -544,8 +549,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
out_gpte_changed:
if (sp)
kvm_mmu_put_page(sp, it.sptep);
- if (!is_error_pfn(pfn))
- kvm_release_pfn_clean(pfn);
+
return NULL;
}
@@ -625,8 +629,10 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code,
return r;
spin_lock(&vcpu->kvm->mmu_lock);
- if (mmu_notifier_retry(vcpu, mmu_seq))
+ if (mmu_notifier_retry(vcpu, mmu_seq)) {
+ r = 0;
goto out_unlock;
+ }
kvm_mmu_audit(vcpu, AUDIT_PRE_PAGE_FAULT);
kvm_mmu_free_some_pages(vcpu);
@@ -640,15 +646,13 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code,
++vcpu->stat.pf_fixed;
kvm_mmu_audit(vcpu, AUDIT_POST_PAGE_FAULT);
- spin_unlock(&vcpu->kvm->mmu_lock);
-
- return emulate;
+ r = emulate;
out_unlock:
spin_unlock(&vcpu->kvm->mmu_lock);
if (!is_error_pfn(pfn))
kvm_release_pfn_clean(pfn);
- return 0;
+ return r;
}
static gpa_t FNAME(get_level1_sp_gpa)(struct kvm_mmu_page *sp)
--
1.7.7.6
--
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