[PATCH v3 1/5] KVM: VMX: adjust interface to allocate/free_vpid

[Wanpeng Li]

Adjust allocate/free_vid so that they can be reused for the nested vpid.

Reviewed-by: Wincy Van <fanwenyi0...@gmail.com>
Signed-off-by: Wanpeng Li <wanpeng...@hotmail.com>
---
 arch/x86/kvm/vmx.c | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index c5c2283..1a0e336 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -4277,29 +4277,28 @@ static int alloc_identity_pagetable(struct kvm *kvm)
        return r;
 }
 
-static void allocate_vpid(struct vcpu_vmx *vmx)
+static int allocate_vpid(void)
 {
        int vpid;
 
-       vmx->vpid = 0;
        if (!enable_vpid)
-               return;
+               return 0;
        spin_lock(&vmx_vpid_lock);
        vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS);
-       if (vpid < VMX_NR_VPIDS) {
-               vmx->vpid = vpid;
+       if (vpid < VMX_NR_VPIDS)
                __set_bit(vpid, vmx_vpid_bitmap);
-       }
+       else
+               vpid = 0;
        spin_unlock(&vmx_vpid_lock);
+       return vpid;
 }
 
-static void free_vpid(struct vcpu_vmx *vmx)
+static void free_vpid(int vpid)
 {
-       if (!enable_vpid)
+       if (!enable_vpid || vpid == 0)
                return;
        spin_lock(&vmx_vpid_lock);
-       if (vmx->vpid != 0)
-               __clear_bit(vmx->vpid, vmx_vpid_bitmap);
+       __clear_bit(vpid, vmx_vpid_bitmap);
        spin_unlock(&vmx_vpid_lock);
 }
 
@@ -8643,7 +8642,7 @@ static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
 
        if (enable_pml)
                vmx_disable_pml(vmx);
-       free_vpid(vmx);
+       free_vpid(vmx->vpid);
        leave_guest_mode(vcpu);
        vmx_load_vmcs01(vcpu);
        free_nested(vmx);
@@ -8662,7 +8661,7 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, 
unsigned int id)
        if (!vmx)
                return ERR_PTR(-ENOMEM);
 
-       allocate_vpid(vmx);
+       vmx->vpid = allocate_vpid();
 
        err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
        if (err)
@@ -8738,7 +8737,7 @@ free_msrs:
 uninit_vcpu:
        kvm_vcpu_uninit(&vmx->vcpu);
 free_vcpu:
-       free_vpid(vmx);
+       free_vpid(vmx->vpid);
        kmem_cache_free(kvm_vcpu_cache, vmx);
        return ERR_PTR(err);
 }
-- 
2.1.0

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