[xen staging] x86/dmop: Properly fail for PV guests

[patchbot@xxxxxxx]

commit 615367b5275a5b0123f1f1ee86c985fab234a5a4
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Thu Feb 25 16:54:17 2021 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Fri Feb 26 12:28:52 2021 +0000

    x86/dmop: Properly fail for PV guests
    
    The current code has an early exit for PV guests, but it returns 0 having 
done
    nothing.
    
    Fixes: 524a98c2ac5 ("public / x86: introduce __HYPERCALL_dm_op...")
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    Release-Acked-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>
---
 xen/arch/x86/hvm/dm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/hvm/dm.c b/xen/arch/x86/hvm/dm.c
index 5bc172a5d4..612749442e 100644
--- a/xen/arch/x86/hvm/dm.c
+++ b/xen/arch/x86/hvm/dm.c
@@ -365,6 +365,7 @@ int dm_op(const struct dmop_args *op_args)
     if ( rc )
         return rc;
 
+    rc = -EINVAL;
     if ( !is_hvm_domain(d) )
         goto out;
 
--
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