[Xen-devel] [PATCH 4/5] libxc/arm: allocate xenstore and console pages

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

Allocate two additional pages at the end of the guest physical memory
for xenstore and console.
Set HVM_PARAM_STORE_PFN and HVM_PARAM_CONSOLE_PFN to the corresponding
values.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 tools/libxc/xc_dom_arm.c |   32 ++++++++++++++++++++++----------
 1 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/tools/libxc/xc_dom_arm.c b/tools/libxc/xc_dom_arm.c
index bb86139..df2eefe 100644
--- a/tools/libxc/xc_dom_arm.c
+++ b/tools/libxc/xc_dom_arm.c
@@ -25,6 +25,10 @@
 #include "xg_private.h"
 #include "xc_dom.h"
 
+#define NR_MAGIC_PAGES 2
+#define CONSOLE_PFN_OFFSET 0
+#define XENSTORE_PFN_OFFSET 1
+
 /* ------------------------------------------------------------------------ */
 /*
  * arm guests are hybrid and start off with paging disabled, therefore no
@@ -47,12 +51,6 @@ static int setup_pgtables_arm(struct xc_dom_image *dom)
 static int alloc_magic_pages(struct xc_dom_image *dom)
 {
     DOMPRINTF_CALLED(dom->xch);
-    /* XXX
-     *   dom->p2m_guest
-     *   dom->start_info_pfn
-     *   dom->xenstore_pfn
-     *   dom->console_pfn
-     */
     return 0;
 }
 
@@ -127,18 +125,19 @@ int arch_setup_meminit(struct xc_dom_image *dom)
 {
     int rc;
     xen_pfn_t pfn, allocsz, i;
+    xen_pfn_t store_pfn, console_pfn;
 
     fprintf(stderr, "%s: tot pages %"PRI_xen_pfn" rambase %"PRI_xen_pfn"\n", 
__func__,
             dom->total_pages, dom->rambase_pfn);
 
     dom->shadow_enabled = 1;
 
-    dom->p2m_host = xc_dom_malloc(dom, sizeof(xen_pfn_t) * dom->total_pages);
+    dom->p2m_host = xc_dom_malloc(dom, sizeof(xen_pfn_t) * (dom->total_pages + 
NR_MAGIC_PAGES));
 
     fprintf(stderr, "%s: setup p2m from %"PRI_xen_pfn" for %"PRI_xen_pfn" 
pages\n", __func__,
             dom->rambase_pfn, dom->total_pages );
     /* setup initial p2m */
-    for ( pfn = 0; pfn < dom->total_pages; pfn++ )
+    for ( pfn = 0; pfn < (dom->total_pages + NR_MAGIC_PAGES); pfn++ )
         dom->p2m_host[pfn] = pfn + dom->rambase_pfn;
 
     fprintf(stderr, "%s: init'd p2m_host[0] = %"PRI_xen_pfn"\n", __func__, 
dom->p2m_host[0]);
@@ -148,10 +147,10 @@ int arch_setup_meminit(struct xc_dom_image *dom)
 
     /* allocate guest memory */
     for ( i = rc = allocsz = 0;
-          (i < dom->total_pages) && !rc;
+          (i < dom->total_pages + NR_MAGIC_PAGES) && !rc;
           i += allocsz )
     {
-        allocsz = dom->total_pages - i;
+        allocsz = (dom->total_pages + NR_MAGIC_PAGES) - i;
         if ( allocsz > 1024*1024 )
             allocsz = 1024*1024;
         fprintf(stderr, "alloc %"PRI_xen_pfn" at offset %"PRI_xen_pfn" which 
is %"PRI_xen_pfn"\n",
@@ -168,6 +167,19 @@ int arch_setup_meminit(struct xc_dom_image *dom)
     fprintf(stderr, "%s: popl'd p2m_host[%"PRI_xen_pfn"] = %"PRI_xen_pfn"\n",
             __func__, dom->total_pages-1, dom->p2m_host[dom->total_pages-1]);
 
+    console_pfn = dom->rambase_pfn + dom->total_pages + CONSOLE_PFN_OFFSET;
+    store_pfn = dom->rambase_pfn + dom->total_pages + XENSTORE_PFN_OFFSET;
+
+    xc_clear_domain_page(dom->xch, dom->guest_domid, console_pfn);
+    xc_clear_domain_page(dom->xch, dom->guest_domid, store_pfn);
+    xc_set_hvm_param(dom->xch, dom->guest_domid, HVM_PARAM_CONSOLE_PFN,
+            console_pfn);
+    xc_set_hvm_param(dom->xch, dom->guest_domid, HVM_PARAM_STORE_PFN,
+            store_pfn);
+
+    fprintf(stderr, "%s: console_pfn=%"PRI_xen_pfn" 
xenstore_pfn=%"PRI_xen_pfn"\n",
+            __func__, console_pfn, store_pfn);
+
     return 0;
 }
 
-- 
1.7.2.5


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