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xen/xen_initial_domain: check that xen_start_info is initialized

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Since commit commit 4c071ee526 ("arm:
initial Xen support") PV on HVM guests can be xen_initial_domain.
However PV on HVM guests might have an unitialized xen_start_info, so
check before accessing its fields.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <Ian.Campbell@citrix.com>
Reported-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Stefano Stabellini 2012-10-03 18:08:52 +01:00 committed by Konrad Rzeszutek Wilk
parent 2e3d886028
commit 4ed5978bdd
1 changed files with 1 additions and 1 deletions
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include/xen/xen.h
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@ -24,7 +24,7 @@ extern enum xen_domain_type xen_domain_type;
#include <asm/xen/hypervisor.h>
#define xen_initial_domain() (xen_domain() && \
xen_start_info->flags & SIF_INITDOMAIN)
xen_start_info && xen_start_info->flags & SIF_INITDOMAIN)
#else /* !CONFIG_XEN_DOM0 */
#define xen_initial_domain() (0)
#endif /* CONFIG_XEN_DOM0 */