x86: split struct domain

This is accomplished by converting a couple of embedded arrays (in one
case a structure containing an array) into separately allocated
pointers, and (just as for struct arch_vcpu in a prior patch)
overlaying some PV-only fields with HVM-only ones.

One particularly noteworthy change in the opposite direction is that
of PITState - this field so far lived in the HVM-only portion, but is
being used by PV guests too, and hence needed to be moved out of
struct hvm_domain.

The change to XENMEM_set_memory_map (and hence libxl__build_pre() and
the movement of the E820 related pieces to struct pv_domain) are
subject to a positive response to a query sent to xen-devel regarding
the need for this to happen for HVM guests (see
http://lists.xensource.com/archives/html/xen-devel/2011-03/msg01848.html).

The protection of arch.hvm_domain.irq.dpci accesses by is_hvm_domain()
is subject to confirmation that the field is used for HVM guests only
(see
http://lists.xensource.com/archives/html/xen-devel/2011-03/msg02004.html).

In the absence of any reply to these queries, and given the early
state of 4.2 development, I think it should be acceptable to take the
risk of having to later undo/redo some of this.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/xen/include/xen/iommu.h b/xen/include/xen/iommu.h
index b7f20ed61f..5cea8032b7 100644
--- a/xen/include/xen/iommu.h
+++ b/xen/include/xen/iommu.h
@@ -106,8 +106,7 @@ struct qi_ctrl *iommu_qi_ctrl(struct iommu *iommu);
 struct ir_ctrl *iommu_ir_ctrl(struct iommu *iommu);
 struct iommu_flush *iommu_get_flush(struct iommu *iommu);
 void hvm_dpci_isairq_eoi(struct domain *d, unsigned int isairq);
-struct hvm_irq_dpci *domain_get_irq_dpci(struct domain *domain);
-int domain_set_irq_dpci(struct domain *domain, struct hvm_irq_dpci *dpci);
+struct hvm_irq_dpci *domain_get_irq_dpci(const struct domain *);
 void free_hvm_irq_dpci(struct hvm_irq_dpci *dpci);
 bool_t pt_irq_need_timer(uint32_t flags);