[PATCH 3/7] RFC arm/domain: Reject invalid combinations of domain creation flags

[Andrew Cooper <andrew.cooper3@citrix.com>]

ARM guests are HVM and have hardware assisted paging.  There are no PV guests
or shadow paging, and all other creation flags are x86 specific.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Stefano Stabellini <sstabellini@kernel.org>
CC: Julien Grall <julien.grall@arm.com>
CC: Ian Jackson <Ian.Jackson@eu.citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>

RFC.  This is untested, but I noticed it when putting together the preceeding
patch.  There is a moderate chance that this will cause things to explode
because of how libxl handles ARM guest construction, but something along these
lines is the right thing to do.
---
 xen/arch/arm/domain.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
index 8de4c0a..291c282 100644
--- a/xen/arch/arm/domain.c
+++ b/xen/arch/arm/domain.c
@@ -585,6 +585,9 @@ int arch_domain_create(struct domain *d, unsigned int domcr_flags,
     if ( is_idle_domain(d) )
         return 0;
 
+    if ( domcr_flags != (XEN_DOMCTL_CDF_hvm_guest | XEN_DOMCTL_CDF_hap) )
+        return -EINVAL;
+
     ASSERT(config != NULL);
 
     /* p2m_init relies on some value initialized by the IOMMU subsystem */
-- 
2.1.4


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