[xen master] x86: fix resource leaks on arch_vcpu_create() error path

[patchbot@xxxxxxx]

commit 6a34e67c118408ebdd62bfa7be76598ca040f170
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Oct 14 14:03:38 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Oct 14 14:03:38 2020 +0200

    x86: fix resource leaks on arch_vcpu_create() error path
    
    {hvm,pv}_vcpu_initialise() have always kind of been meant to be the
    final possible source of errors in arch_vcpu_create(), hence not
    requiring any unrolling of what they've done on the error path. (Of
    course this may change once the various involved paths all have become
    idempotent.)
    
    But even beyond this aspect I think it is more logical to do policy
    initialization ahead of the calling of these two functions, as they may
    in principle want to access it.
    
    Fixes: 4187f79dc718 ("x86/msr: introduce struct msr_vcpu_policy")
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/domain.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 5454f94d18..1b894d0124 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -569,6 +569,9 @@ int arch_vcpu_create(struct vcpu *v)
         vmce_init_vcpu(v);
 
         arch_vcpu_regs_init(v);
+
+        if ( (rc = init_vcpu_msr_policy(v)) )
+            goto fail;
     }
     else if ( (rc = xstate_alloc_save_area(v)) != 0 )
         return rc;
@@ -594,9 +597,6 @@ int arch_vcpu_create(struct vcpu *v)
     {
         vpmu_initialise(v);
 
-        if ( (rc = init_vcpu_msr_policy(v)) )
-            goto fail;
-
         cpuid_policy_updated(v);
     }
 
--
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