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[Xen-devel] [RFC 1/4] HVM x86 deprivileged mode: Page allocation helper



This allocation function is used by the deprivileged mode initialisation code
to allocate pages for the new page table mappings and page frames on the HAP
page heap.

Signed-off-by: Ben Catterall <Ben.Catterall@xxxxxxxxxx>
---
 xen/arch/x86/mm/hap/hap.c    | 23 +++++++++++++++++++++++
 xen/include/asm-x86/domain.h |  1 +
 xen/include/asm-x86/hap.h    |  5 +++++
 3 files changed, 29 insertions(+)

diff --git a/xen/arch/x86/mm/hap/hap.c b/xen/arch/x86/mm/hap/hap.c
index d375c4d..593cba7 100644
--- a/xen/arch/x86/mm/hap/hap.c
+++ b/xen/arch/x86/mm/hap/hap.c
@@ -844,6 +844,29 @@ static const struct paging_mode hap_paging_long_mode = {
     .guest_levels           = 4
 };
 
+/************************************************/
+/*               HAP HVM functions              */
+/************************************************/
+struct page_info *hvm_alloc_page(struct domain *d)
+{
+    struct page_info *pg;
+
+    if( (pg = hap_alloc(d)) == NULL )
+    {
+        HAP_ERROR("HVM: Out of memory allocating HVM page\n");
+        domain_crash(d);
+        return NULL;
+    }
+
+    ASSERT(paging_locked_by_me(d));
+
+    /* Track our used pages */
+    page_list_add(pg, &d->arch.paging.hap.hvmlist);
+
+    return pg;
+}
+
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/include/asm-x86/domain.h b/xen/include/asm-x86/domain.h
index 0fce09e..c46a31a 100644
--- a/xen/include/asm-x86/domain.h
+++ b/xen/include/asm-x86/domain.h
@@ -154,6 +154,7 @@ struct shadow_vcpu {
 /************************************************/
 struct hap_domain {
     struct page_list_head freelist;
+    struct page_list_head hvmlist;  /* HVM usermode page allocation */
     unsigned int      total_pages;  /* number of pages allocated */
     unsigned int      free_pages;   /* number of pages on freelists */
     unsigned int      p2m_pages;    /* number of pages allocates to p2m */
diff --git a/xen/include/asm-x86/hap.h b/xen/include/asm-x86/hap.h
index bd87481..0432eb5 100644
--- a/xen/include/asm-x86/hap.h
+++ b/xen/include/asm-x86/hap.h
@@ -48,6 +48,11 @@ int   hap_track_dirty_vram(struct domain *d,
 extern const struct paging_mode *hap_paging_get_mode(struct vcpu *);
 void hap_set_alloc_for_pvh_dom0(struct domain *d, unsigned long num_pages);
 
+/************************************************/
+/*               hap HVM functions              */
+/************************************************/
+
+struct page_info *hvm_alloc_page(struct domain *d);
 #endif /* XEN_HAP_H */
 
 /*
-- 
2.1.4


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