Extend max vcpu number for HVM guest

Reduce size of Xen-qemu shared ioreq structure to 32 bytes. This
has two advantages:
 1. We can support up to 128 VCPUs with a single shared page
 2. If/when we want to go beyond 128 VCPUs, a whole number of ioreq_t
    structures will pack into a single shared page, so a multi-page
    array will have no ioreq_t straddling a page boundary

Also, while modifying qemu, replace a 32-entry vcpu-indexed array
with a dynamically-allocated array.

Signed-off-by: Keir Fraser <keir.fraser@citrix.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/xen/include/asm-x86/hvm/support.h b/xen/include/asm-x86/hvm/support.h
index cfacb04e4e..a3e41655f3 100644
--- a/xen/include/asm-x86/hvm/support.h
+++ b/xen/include/asm-x86/hvm/support.h
@@ -27,13 +27,13 @@
 #include <asm/regs.h>
 #include <asm/processor.h>
 
-static inline vcpu_iodata_t *get_ioreq(struct vcpu *v)
+static inline ioreq_t *get_ioreq(struct vcpu *v)
 {
     struct domain *d = v->domain;
     shared_iopage_t *p = d->arch.hvm_domain.ioreq.va;
     ASSERT((v == current) || spin_is_locked(&d->arch.hvm_domain.ioreq.lock));
     ASSERT(d->arch.hvm_domain.ioreq.va != NULL);
-    return &p->vcpu_iodata[v->vcpu_id];
+    return &p->vcpu_ioreq[v->vcpu_id];
 }
 
 #define HVM_DELIVER_NO_ERROR_CODE  -1