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Diffstat (limited to 'arch/x86/kvm/paging_tmpl.h')
-rw-r--r--arch/x86/kvm/paging_tmpl.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 56b88f7e83ef..7f83f5557d5e 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -368,11 +368,13 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
if (r)
return r;
+ down_read(&current->mm->mmap_sem);
/*
* Look up the shadow pte for the faulting address.
*/
r = FNAME(walk_addr)(&walker, vcpu, addr, write_fault, user_fault,
fetch_fault);
+ up_read(&current->mm->mmap_sem);
/*
* The page is not mapped by the guest. Let the guest handle it.
@@ -384,6 +386,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
return 0;
}
+ mutex_lock(&vcpu->kvm->lock);
shadow_pte = FNAME(fetch)(vcpu, addr, &walker, user_fault, write_fault,
&write_pt);
pgprintk("%s: shadow pte %p %llx ptwrite %d\n", __FUNCTION__,
@@ -395,11 +398,14 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
/*
* mmio: emulate if accessible, otherwise its a guest fault.
*/
- if (shadow_pte && is_io_pte(*shadow_pte))
+ if (shadow_pte && is_io_pte(*shadow_pte)) {
+ mutex_unlock(&vcpu->kvm->lock);
return 1;
+ }
++vcpu->stat.pf_fixed;
kvm_mmu_audit(vcpu, "post page fault (fixed)");
+ mutex_unlock(&vcpu->kvm->lock);
return write_pt;
}