[PATCH] nestedsvm: fix memory leak on shutdown/crash

[Christoph Egger <Christoph.Egger@amd.com>]

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Fix memory leak of l1 vmcb page when destroying a vcpu while
l2 guest is running.

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>

-- 
---to satisfy European Law for business letters:
Advanced Micro Devices GmbH
Einsteinring 24, 85689 Dornach b. Muenchen
Geschaeftsfuehrer: Alberto Bozzo
Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen
Registergericht Muenchen, HRB Nr. 43632

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diff -r 6b73078a4403 xen/arch/x86/hvm/svm/nestedsvm.c
--- a/xen/arch/x86/hvm/svm/nestedsvm.c	Fri Oct 12 14:38:20 2012 +0200
+++ b/xen/arch/x86/hvm/svm/nestedsvm.c	Wed Oct 17 09:08:20 2012 +0200
@@ -122,6 +122,15 @@ void nsvm_vcpu_destroy(struct vcpu *v)
     struct nestedvcpu *nv = &vcpu_nestedhvm(v);
     struct nestedsvm *svm = &vcpu_nestedsvm(v);
 
+    /*
+     * When destroying the vcpu, it may be running on behalf of l2 guest.
+     * Therefore we need to switch the VMCB pointer back to the l1 vmcb,
+     * in order to avoid double free of l2 vmcb and the possible memory leak
+     * of l1 vmcb page.
+     */
+    if (nv->nv_n1vmcx)
+        v->arch.hvm_svm.vmcb = nv->nv_n1vmcx;
+
     if (svm->ns_cached_msrpm) {
         free_xenheap_pages(svm->ns_cached_msrpm,
                            get_order_from_bytes(MSRPM_SIZE));

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