[PATCH 041/104] KVM: Don't assign vcpu->cr3 if it's invalid: check first, set last

Avi Kivity
2007-09-17T08:31:23Z

From: Rusty Russell <rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>

sSigned-off-by: Rusty Russell <rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
Signed-off-by: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
---
drivers/kvm/kvm_main.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 2be6b1c..5dc6017 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -579,7 +579,6 @@ void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
}
}

- vcpu->cr3 = cr3;
mutex_lock(&vcpu->kvm->lock);
/*
* Does the new cr3 value map to physical memory? (Note, we
@@ -592,8 +591,10 @@ void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
*/
if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
inject_gp(vcpu);
- else
+ else {
+ vcpu->cr3 = cr3;
vcpu->mmu.new_cr3(vcpu);
+ }
mutex_unlock(&vcpu->kvm->lock);
}
EXPORT_SYMBOL_GPL(set_cr3);