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x86, xen: short-circuit tests for dom0 

When testing for a dom0/initial/privileged domain, make sure the
predicate evaluates to a compile-time 0 if CONFIG_XEN_DOM0 isn't
enabled.  This will make most of the dom0 code evaporate without
much more effort.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2009-02-06 13:35:44 -08:00 committed by Ingo Molnar
parent 7032e86967
commit 9033304a15
1 changed files with 18 additions and 10 deletions
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28
arch/x86/include/asm/xen/hypervisor.h
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@ -38,22 +38,30 @@ extern struct shared_info *HYPERVISOR_shared_info;
extern struct start_info *xen_start_info;
enum xen_domain_type {
XEN_NATIVE,
XEN_PV_DOMAIN,
XEN_HVM_DOMAIN,
XEN_NATIVE, /* running on bare hardware */
XEN_PV_DOMAIN, /* running in a PV domain */
XEN_HVM_DOMAIN, /* running in a Xen hvm domain */
};
extern enum xen_domain_type xen_domain_type;
#ifdef CONFIG_XEN
#define xen_domain() (xen_domain_type != XEN_NATIVE)
extern enum xen_domain_type xen_domain_type;
#else
#define xen_domain() (0)
#define xen_domain_type XEN_NATIVE
#endif
#define xen_pv_domain() (xen_domain() && xen_domain_type == XEN_PV_DOMAIN)
#define xen_hvm_domain() (xen_domain() && xen_domain_type == XEN_HVM_DOMAIN)
#define xen_domain() (xen_domain_type != XEN_NATIVE)
#define xen_pv_domain() (xen_domain() && \
xen_domain_type == XEN_PV_DOMAIN)
#define xen_hvm_domain() (xen_domain() && \
xen_domain_type == XEN_HVM_DOMAIN)
#define xen_initial_domain() (xen_pv_domain() && xen_start_info->flags & SIF_INITDOMAIN)
#ifdef CONFIG_XEN_DOM0
#include <xen/interface/xen.h>
#define xen_initial_domain() (xen_pv_domain() && \
xen_start_info->flags & SIF_INITDOMAIN)
#else /* !CONFIG_XEN_DOM0 */
#define xen_initial_domain() (0)
#endif /* CONFIG_XEN_DOM0 */
#endif /* _ASM_X86_XEN_HYPERVISOR_H */