[Xen-devel] [PATCH 0/6] x86: break up post-boot non-order-zero allocations

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

While tmem is most affected by this, due to fragmentation it is generally
a bad idea to require runtime allocations of more than a single page in
size.

1: remove direct cpumask_t members from struct vcpu and struct domain
2: x86: split struct vcpu
3: x86: move pv-only members of struct vcpu to struct pv_vcpu
4: x86: split struct domain
5: x86: introduce alloc_vcpu_guest_context()
6: passthrough: use domain pirq as index of struct hvm_irq_dpci's hvm_timer 
array

With this, structure sizes are below page size, and no longer depend
significantly on NR_CPUS. This series, however, doesn't eliminate
all non-order-zero allocations that happen post boot (i.e. mostly
during domain creation). Items that are known to need addressing
are
- nr_irqs-sized allocation of ->arch.irq_pirq[] in
  xen/arch/x86/domain.c:arch_domain_create()
- ->nr_pirqs-sized allocations in
  xen/drivers/passthrough/io.c:pt_irq_create_bind_vtd()
- ->nr_pirqs-sized allocation of ->arch.pirq_irq[] in
  xen/arch/x86/domain.c:arch_domain_create()
- ->nr_pirqs-sized allocation of ->pirq_to_evtchn[] in
  xen/common/domain.c:domain_create()

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>


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