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Date: Sun, 28 Sep 2008 18:44:59 +0300
From: Avi Kivity <avi@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: kvm@...r.kernel.org, Marcelo Tosatti <mtosatti@...hat.com>
Subject: [PATCH 23/25] KVM: switch to get_user_pages_fast
From: Marcelo Tosatti <mtosatti@...hat.com>
Convert gfn_to_pfn to use get_user_pages_fast, which can do lockless
pagetable lookups on x86. Kernel compilation on 4-way guest is 3.7%
faster on VMX.
Signed-off-by: Marcelo Tosatti <mtosatti@...hat.com>
Signed-off-by: Avi Kivity <avi@...hat.com>
---
arch/powerpc/kvm/44x_tlb.c | 2 --
arch/x86/kvm/mmu.c | 23 +++++++++--------------
arch/x86/kvm/paging_tmpl.h | 8 +-------
arch/x86/kvm/vmx.c | 4 ----
arch/x86/kvm/x86.c | 6 ------
virt/kvm/kvm_main.c | 10 +++++-----
6 files changed, 15 insertions(+), 38 deletions(-)
diff --git a/arch/powerpc/kvm/44x_tlb.c b/arch/powerpc/kvm/44x_tlb.c
index 7b11fd7..2e227a4 100644
--- a/arch/powerpc/kvm/44x_tlb.c
+++ b/arch/powerpc/kvm/44x_tlb.c
@@ -147,9 +147,7 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 gvaddr, gfn_t gfn, u64 asid,
stlbe = &vcpu->arch.shadow_tlb[victim];
/* Get reference to new page. */
- down_read(¤t->mm->mmap_sem);
new_page = gfn_to_page(vcpu->kvm, gfn);
- up_read(¤t->mm->mmap_sem);
if (is_error_page(new_page)) {
printk(KERN_ERR "Couldn't get guest page for gfn %lx!\n", gfn);
kvm_release_page_clean(new_page);
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index bce3e25..5779a23 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -405,16 +405,19 @@ static int host_largepage_backed(struct kvm *kvm, gfn_t gfn)
{
struct vm_area_struct *vma;
unsigned long addr;
+ int ret = 0;
addr = gfn_to_hva(kvm, gfn);
if (kvm_is_error_hva(addr))
- return 0;
+ return ret;
+ down_read(¤t->mm->mmap_sem);
vma = find_vma(current->mm, addr);
if (vma && is_vm_hugetlb_page(vma))
- return 1;
+ ret = 1;
+ up_read(¤t->mm->mmap_sem);
- return 0;
+ return ret;
}
static int is_largepage_backed(struct kvm_vcpu *vcpu, gfn_t large_gfn)
@@ -1140,9 +1143,7 @@ struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva)
if (gpa == UNMAPPED_GVA)
return NULL;
- down_read(¤t->mm->mmap_sem);
page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
- up_read(¤t->mm->mmap_sem);
return page;
}
@@ -1330,16 +1331,14 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn)
pfn_t pfn;
unsigned long mmu_seq;
- down_read(¤t->mm->mmap_sem);
if (is_largepage_backed(vcpu, gfn & ~(KVM_PAGES_PER_HPAGE-1))) {
gfn &= ~(KVM_PAGES_PER_HPAGE-1);
largepage = 1;
}
mmu_seq = vcpu->kvm->mmu_notifier_seq;
- /* implicit mb(), we'll read before PT lock is unlocked */
+ smp_rmb();
pfn = gfn_to_pfn(vcpu->kvm, gfn);
- up_read(¤t->mm->mmap_sem);
/* mmio */
if (is_error_pfn(pfn)) {
@@ -1488,15 +1487,13 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa,
if (r)
return r;
- down_read(¤t->mm->mmap_sem);
if (is_largepage_backed(vcpu, gfn & ~(KVM_PAGES_PER_HPAGE-1))) {
gfn &= ~(KVM_PAGES_PER_HPAGE-1);
largepage = 1;
}
mmu_seq = vcpu->kvm->mmu_notifier_seq;
- /* implicit mb(), we'll read before PT lock is unlocked */
+ smp_rmb();
pfn = gfn_to_pfn(vcpu->kvm, gfn);
- up_read(¤t->mm->mmap_sem);
if (is_error_pfn(pfn)) {
kvm_release_pfn_clean(pfn);
return 1;
@@ -1809,15 +1806,13 @@ static void mmu_guess_page_from_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
return;
gfn = (gpte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;
- down_read(¤t->mm->mmap_sem);
if (is_large_pte(gpte) && is_largepage_backed(vcpu, gfn)) {
gfn &= ~(KVM_PAGES_PER_HPAGE-1);
vcpu->arch.update_pte.largepage = 1;
}
vcpu->arch.update_pte.mmu_seq = vcpu->kvm->mmu_notifier_seq;
- /* implicit mb(), we'll read before PT lock is unlocked */
+ smp_rmb();
pfn = gfn_to_pfn(vcpu->kvm, gfn);
- up_read(¤t->mm->mmap_sem);
if (is_error_pfn(pfn)) {
kvm_release_pfn_clean(pfn);
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index b671f61..6dd08e0 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -102,14 +102,10 @@ static bool FNAME(cmpxchg_gpte)(struct kvm *kvm,
pt_element_t *table;
struct page *page;
- down_read(¤t->mm->mmap_sem);
page = gfn_to_page(kvm, table_gfn);
- up_read(¤t->mm->mmap_sem);
table = kmap_atomic(page, KM_USER0);
-
ret = CMPXCHG(&table[index], orig_pte, new_pte);
-
kunmap_atomic(table, KM_USER0);
kvm_release_page_dirty(page);
@@ -418,7 +414,6 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
return 0;
}
- down_read(¤t->mm->mmap_sem);
if (walker.level == PT_DIRECTORY_LEVEL) {
gfn_t large_gfn;
large_gfn = walker.gfn & ~(KVM_PAGES_PER_HPAGE-1);
@@ -428,9 +423,8 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
}
}
mmu_seq = vcpu->kvm->mmu_notifier_seq;
- /* implicit mb(), we'll read before PT lock is unlocked */
+ smp_rmb();
pfn = gfn_to_pfn(vcpu->kvm, walker.gfn);
- up_read(¤t->mm->mmap_sem);
/* mmio */
if (is_error_pfn(pfn)) {
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 046a91b..025bf40 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2010,9 +2010,7 @@ static int alloc_apic_access_page(struct kvm *kvm)
if (r)
goto out;
- down_read(¤t->mm->mmap_sem);
kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00);
- up_read(¤t->mm->mmap_sem);
out:
up_write(&kvm->slots_lock);
return r;
@@ -2034,10 +2032,8 @@ static int alloc_identity_pagetable(struct kvm *kvm)
if (r)
goto out;
- down_read(¤t->mm->mmap_sem);
kvm->arch.ept_identity_pagetable = gfn_to_page(kvm,
VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT);
- up_read(¤t->mm->mmap_sem);
out:
up_write(&kvm->slots_lock);
return r;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 61eddbe..108f072 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -946,10 +946,8 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
/* ...but clean it before doing the actual write */
vcpu->arch.time_offset = data & ~(PAGE_MASK | 1);
- down_read(¤t->mm->mmap_sem);
vcpu->arch.time_page =
gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT);
- up_read(¤t->mm->mmap_sem);
if (is_error_page(vcpu->arch.time_page)) {
kvm_release_page_clean(vcpu->arch.time_page);
@@ -2322,9 +2320,7 @@ static int emulator_cmpxchg_emulated(unsigned long addr,
val = *(u64 *)new;
- down_read(¤t->mm->mmap_sem);
page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
- up_read(¤t->mm->mmap_sem);
kaddr = kmap_atomic(page, KM_USER0);
set_64bit((u64 *)(kaddr + offset_in_page(gpa)), val);
@@ -3089,9 +3085,7 @@ static void vapic_enter(struct kvm_vcpu *vcpu)
if (!apic || !apic->vapic_addr)
return;
- down_read(¤t->mm->mmap_sem);
page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
- up_read(¤t->mm->mmap_sem);
vcpu->arch.apic->vapic_page = page;
}
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 2907d05..cd34f73 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -723,9 +723,6 @@ unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
}
EXPORT_SYMBOL_GPL(gfn_to_hva);
-/*
- * Requires current->mm->mmap_sem to be held
- */
pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
{
struct page *page[1];
@@ -741,20 +738,23 @@ pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
return page_to_pfn(bad_page);
}
- npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
- NULL);
+ npages = get_user_pages_fast(addr, 1, 1, page);
if (unlikely(npages != 1)) {
struct vm_area_struct *vma;
+ down_read(¤t->mm->mmap_sem);
vma = find_vma(current->mm, addr);
+
if (vma == NULL || addr < vma->vm_start ||
!(vma->vm_flags & VM_PFNMAP)) {
+ up_read(¤t->mm->mmap_sem);
get_page(bad_page);
return page_to_pfn(bad_page);
}
pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
+ up_read(¤t->mm->mmap_sem);
BUG_ON(!is_mmio_pfn(pfn));
} else
pfn = page_to_pfn(page[0]);
--
1.6.0.1
--
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