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| author | Marcelo Tosatti | 2008-09-17 01:54:47 +0200 |
|---|---|---|
| committer | Avi Kivity | 2008-10-15 14:25:06 +0200 |
| commit | 4c2155ce81c193788082d4b8cdbc26d79edebc58 (patch) | |
| tree | 5c028fe4a18c55b5c0e9c4e80be459dad3f96da7 /arch/x86/kvm/vmx.c | |
| parent | KVM: opencode gfn_to_page in kvm_vm_fault (diff) | |
| download | kernel-qcow2-linux-4c2155ce81c193788082d4b8cdbc26d79edebc58.tar.gz kernel-qcow2-linux-4c2155ce81c193788082d4b8cdbc26d79edebc58.tar.xz kernel-qcow2-linux-4c2155ce81c193788082d4b8cdbc26d79edebc58.zip | |
KVM: switch to get_user_pages_fast
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@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx.c')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 046a91b5a4ba..025bf4011abc 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; |