[PATCH RFC 10/15] libxc: allow caller to specify guest rambase rather than hardcoding

[Ian Campbell <ian.campbell@citrix.com>]

It's still hardcoded but it could now be plausibly be made variable.

TODO: the #if is a bit lame.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
---
 tools/libxc/xc_dom.h                 |    1 +
 tools/libxc/xc_dom_armzimageloader.c |   12 +-----------
 tools/libxc/xc_dom_core.c            |    8 ++++++++
 tools/libxl/libxl_dom.c              |   10 ++++++++++
 4 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/tools/libxc/xc_dom.h b/tools/libxc/xc_dom.h
index 86e23ee..ed49aa7 100644
--- a/tools/libxc/xc_dom.h
+++ b/tools/libxc/xc_dom.h
@@ -197,6 +197,7 @@ struct xc_dom_image *xc_dom_allocate(xc_interface *xch,
                                      const char *cmdline, const char *features);
 void xc_dom_release_phys(struct xc_dom_image *dom);
 void xc_dom_release(struct xc_dom_image *dom);
+int xc_dom_rambase_init(struct xc_dom_image *dom, uint64_t rambase);
 int xc_dom_mem_init(struct xc_dom_image *dom, unsigned int mem_mb);
 
 /* Set this larger if you have enormous ramdisks/kernels. Note that
diff --git a/tools/libxc/xc_dom_armzimageloader.c b/tools/libxc/xc_dom_armzimageloader.c
index b693390..4e3f7ae 100644
--- a/tools/libxc/xc_dom_armzimageloader.c
+++ b/tools/libxc/xc_dom_armzimageloader.c
@@ -30,12 +30,6 @@
 
 #include <arpa/inet.h> /* XXX ntohl is not the right function... */
 
-/*
- * Guest virtual RAM starts here. This must be consistent with the DTB
- * appended to the guest kernel.
- */
-#define GUEST_RAM_BASE 0x80000000
-
 struct minimal_dtb_header {
     uint32_t magic;
     uint32_t total_size;
@@ -103,14 +97,12 @@ static int xc_dom_parse_zimage32_kernel(struct xc_dom_image *dom)
     uint32_t *zimage;
     uint32_t start, entry_addr;
     uint64_t v_start, v_end;
-    uint64_t rambase = GUEST_RAM_BASE;
+    uint64_t rambase = dom->rambase_pfn << XC_PAGE_SHIFT;
 
     DOMPRINTF_CALLED(dom->xch);
 
     zimage = (uint32_t *)dom->kernel_blob;
 
-    dom->rambase_pfn = rambase >> XC_PAGE_SHIFT;
-
     /* Do not load kernel at the very first RAM address */
     v_start = rambase + 0x8000;
     v_end = v_start + dom->kernel_size;
@@ -130,8 +122,6 @@ static int xc_dom_parse_zimage32_kernel(struct xc_dom_image *dom)
     dom->parms.virt_base = rambase;
 
     dom->guest_type = "xen-3.0-armv7l";
-    DOMPRINTF("%s: %s: RAM starts at %"PRI_xen_pfn,
-              __FUNCTION__, dom->guest_type, dom->rambase_pfn);
     DOMPRINTF("%s: %s: 0x%" PRIx64 " -> 0x%" PRIx64 "",
               __FUNCTION__, dom->guest_type,
               dom->kernel_seg.vstart, dom->kernel_seg.vend);
diff --git a/tools/libxc/xc_dom_core.c b/tools/libxc/xc_dom_core.c
index 0f367f6..a67f718 100644
--- a/tools/libxc/xc_dom_core.c
+++ b/tools/libxc/xc_dom_core.c
@@ -785,6 +785,14 @@ int xc_dom_parse_image(struct xc_dom_image *dom)
     return -1;
 }
 
+int xc_dom_rambase_init(struct xc_dom_image *dom, uint64_t rambase)
+{
+    dom->rambase_pfn = rambase >> XC_PAGE_SHIFT;
+    DOMPRINTF("%s: RAM starts at %"PRI_xen_pfn,
+              __FUNCTION__, dom->rambase_pfn);
+    return 0;
+}
+
 int xc_dom_mem_init(struct xc_dom_image *dom, unsigned int mem_mb)
 {
     unsigned int page_shift;
diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index 6e2252a..631cdf5 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -24,6 +24,10 @@
 #include <xen/hvm/hvm_info_table.h>
 #include <xen/hvm/hvm_xs_strings.h>
 
+#if defined(__arm__) || defined(__aarch64__)
+#define GUEST_RAM_BASE 0x80000000
+#endif
+
 libxl_domain_type libxl__domain_type(libxl__gc *gc, uint32_t domid)
 {
     libxl_ctx *ctx = libxl__gc_owner(gc);
@@ -380,6 +384,12 @@ int libxl__build_pv(libxl__gc *gc, uint32_t domid,
         LOGE(ERROR, "xc_dom_boot_xen_init failed");
         goto out;
     }
+#ifdef GUEST_RAM_BASE
+    if ( (ret = xc_dom_rambase_init(dom, GUEST_RAM_BASE)) != 0 ) {
+        LOGE(ERROR, "xc_dom_rambase failed");
+        goto out;
+    }
+#endif
     if ( (ret = xc_dom_parse_image(dom)) != 0 ) {
         LOGE(ERROR, "xc_dom_parse_image failed");
         goto out;
-- 
1.7.10.4