x86: fix nested HVM initialization

- no need for calling nestedhvm_setup() explicitly (can be a normal
  init-call, and can be __init)
- calling _xmalloc() for multi-page, page-aligned memory regions is
  inefficient - use alloc_xenheap_pages() instead
- albeit an allocation error is unlikely here, add error handling
  nevertheless (and have nestedhvm_vcpu_initialise() bail if an error
  occurred during setup)
- nestedhvm_enabled() must no access d->arch.hvm_domain without first
  checking that 'd' actually represents a HVM domain

Signed-off-by: Jan Beulich <JBeulich@suse.com>
Committed-by: Keir Fraser <keir@xen.org>

1 files changed, 0 insertions, 1 deletions

diff --git a/xen/include/asm-x86/setup.h b/xen/include/asm-x86/setup.h
index 4a16302b53..abbab23afe 100644
--- a/xen/include/asm-x86/setup.h
+++ b/xen/include/asm-x86/setup.h
@@ -21,7 +21,6 @@ void set_nr_cpu_ids(unsigned int max_cpus);
 void numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn);
 void arch_init_memory(void);
 void subarch_init_memory(void);
-void nestedhvm_setup(void);
 
 void init_IRQ(void);
 void vesa_init(void);