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| author | Hollis Blanchard <hollisb@us.ibm.com> | 2008-09-11 10:04:29 -0500 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-10-15 10:15:26 +0200 |
| commit | 0bd595fc222583ca260f259698f72e9946c6e524 (patch) | |
| tree | 6bf391a57b5c13035b074190b9714a622d84868e | |
| parent | 9c3e4aab5ae27bf8589d61c7874e213832b4b7d2 (diff) | |
| download | linux-0bd595fc222583ca260f259698f72e9946c6e524.tar.gz linux-0bd595fc222583ca260f259698f72e9946c6e524.tar.bz2 linux-0bd595fc222583ca260f259698f72e9946c6e524.zip | |
KVM: ppc: kvmppc_44x_shadow_release() does not require mmap_sem to be locked
And it gets in the way of get_user_pages_fast().
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
| -rw-r--r-- | arch/powerpc/kvm/44x_tlb.c | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/arch/powerpc/kvm/44x_tlb.c b/arch/powerpc/kvm/44x_tlb.c index 3594bbd1f618..7b11fd7be542 100644 --- a/arch/powerpc/kvm/44x_tlb.c +++ b/arch/powerpc/kvm/44x_tlb.c @@ -110,7 +110,6 @@ static int kvmppc_44x_tlbe_is_writable(struct tlbe *tlbe) return tlbe->word2 & (PPC44x_TLB_SW|PPC44x_TLB_UW); } -/* Must be called with mmap_sem locked for writing. */ static void kvmppc_44x_shadow_release(struct kvm_vcpu *vcpu, unsigned int index) { @@ -150,17 +149,16 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 gvaddr, gfn_t gfn, u64 asid, /* 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); - up_read(¤t->mm->mmap_sem); return; } hpaddr = page_to_phys(new_page); /* Drop reference to old page. */ kvmppc_44x_shadow_release(vcpu, victim); - up_read(¤t->mm->mmap_sem); vcpu->arch.shadow_pages[victim] = new_page; @@ -194,7 +192,6 @@ void kvmppc_mmu_invalidate(struct kvm_vcpu *vcpu, gva_t eaddr, int i; /* XXX Replace loop with fancy data structures. */ - down_write(¤t->mm->mmap_sem); for (i = 0; i <= tlb_44x_hwater; i++) { struct tlbe *stlbe = &vcpu->arch.shadow_tlb[i]; unsigned int tid; @@ -219,7 +216,6 @@ void kvmppc_mmu_invalidate(struct kvm_vcpu *vcpu, gva_t eaddr, stlbe->tid, stlbe->word0, stlbe->word1, stlbe->word2, handler); } - up_write(¤t->mm->mmap_sem); } /* Invalidate all mappings on the privilege switch after PID has been changed. @@ -231,7 +227,6 @@ void kvmppc_mmu_priv_switch(struct kvm_vcpu *vcpu, int usermode) if (vcpu->arch.swap_pid) { /* XXX Replace loop with fancy data structures. */ - down_write(¤t->mm->mmap_sem); for (i = 0; i <= tlb_44x_hwater; i++) { struct tlbe *stlbe = &vcpu->arch.shadow_tlb[i]; @@ -243,7 +238,6 @@ void kvmppc_mmu_priv_switch(struct kvm_vcpu *vcpu, int usermode) stlbe->tid, stlbe->word0, stlbe->word1, stlbe->word2, handler); } - up_write(¤t->mm->mmap_sem); vcpu->arch.swap_pid = 0; } |