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From: Lai Jiangshan on 17 Apr 2010 04:50

Fix bug of the exception path, free allocated vpid when fail
to create vcpu.

Signed-off-by: Lai Jiangshan <laijs(a)cn.fujitsu.com>
---
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 686492e..077cac5 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2290,6 +2290,16 @@ static void allocate_vpid(struct vcpu_vmx *vmx)
spin_unlock(&vmx_vpid_lock);
}

+static void free_vpid(struct vcpu_vmx *vmx)
+{
+ if (!enable_vpid)
+ return;
+ spin_lock(&vmx_vpid_lock);
+ if (vmx->vpid != 0)
+ __clear_bit(vmx->vpid, vmx_vpid_bitmap);
+ spin_unlock(&vmx_vpid_lock);
+}
+
static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, u32 msr)
{
int f = sizeof(unsigned long);
@@ -3915,10 +3925,7 @@ static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);

- spin_lock(&vmx_vpid_lock);
- if (vmx->vpid != 0)
- __clear_bit(vmx->vpid, vmx_vpid_bitmap);
- spin_unlock(&vmx_vpid_lock);
+ free_vpid(vmx);
vmx_free_vmcs(vcpu);
kfree(vmx->guest_msrs);
kvm_vcpu_uninit(vcpu);
@@ -3980,6 +3987,7 @@ free_msrs:
uninit_vcpu:
kvm_vcpu_uninit(&vmx->vcpu);
free_vcpu:
+ free_vpid(vmx);
kmem_cache_free(kvm_vcpu_cache, vmx);
return ERR_PTR(err);
}

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Prev: Mr. Paul Gomez.
Next: [PATCH] kvm x86 mmu: simplify kvm_mmu_unlink_parents()