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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v6 13/16] libxc: arm: allow passing a device tree blob to the guest
Placement of the blob in guest RAM is simplistic but will do for now.
This operation is only supported on ARM.
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
v6: Minor coding style.
v4: Return EINVAL on non-ARM platforms (which do not support device-tree)
Slightly less rubbish DTB placement which isn't perfect but at least now
doesn't fail with <128MB of RAM.
---
tools/libxc/xc_dom.h | 8 +++++++
tools/libxc/xc_dom_arm.c | 22 ++++++++++++++++++-
tools/libxc/xc_dom_core.c | 53 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 82 insertions(+), 1 deletion(-)
diff --git a/tools/libxc/xc_dom.h b/tools/libxc/xc_dom.h
index 0bc58c2..a183e62 100644
--- a/tools/libxc/xc_dom.h
+++ b/tools/libxc/xc_dom.h
@@ -51,9 +51,12 @@ struct xc_dom_image {
size_t kernel_size;
void *ramdisk_blob;
size_t ramdisk_size;
+ void *devicetree_blob;
+ size_t devicetree_size;
size_t max_kernel_size;
size_t max_ramdisk_size;
+ size_t max_devicetree_size;
/* arguments and parameters */
char *cmdline;
@@ -215,6 +218,8 @@ int xc_dom_kernel_max_size(struct xc_dom_image *dom, size_t
sz);
int xc_dom_ramdisk_check_size(struct xc_dom_image *dom, size_t sz);
int xc_dom_ramdisk_max_size(struct xc_dom_image *dom, size_t sz);
+int xc_dom_devicetree_max_size(struct xc_dom_image *dom, size_t sz);
+
size_t xc_dom_check_gzip(xc_interface *xch,
void *blob, size_t ziplen);
int xc_dom_do_gunzip(xc_interface *xch,
@@ -227,6 +232,9 @@ int xc_dom_kernel_mem(struct xc_dom_image *dom, const void
*mem,
size_t memsize);
int xc_dom_ramdisk_mem(struct xc_dom_image *dom, const void *mem,
size_t memsize);
+int xc_dom_devicetree_file(struct xc_dom_image *dom, const char *filename);
+int xc_dom_devicetree_mem(struct xc_dom_image *dom, const void *mem,
+ size_t memsize);
int xc_dom_parse_image(struct xc_dom_image *dom);
struct xc_dom_arch *xc_dom_find_arch_hooks(xc_interface *xch, char
*guest_type);
diff --git a/tools/libxc/xc_dom_arm.c b/tools/libxc/xc_dom_arm.c
index 9f3fdd3..71138f3 100644
--- a/tools/libxc/xc_dom_arm.c
+++ b/tools/libxc/xc_dom_arm.c
@@ -124,7 +124,8 @@ static int vcpu_arm(struct xc_dom_image *dom, void *ptr)
* using CONFIG_ARM_APPENDED_DTB. Ensure that r2 does not look
* like a valid pointer to a set of ATAGS or a DTB.
*/
- ctxt->user_regs.r2_usr = 0xffffffff;
+ ctxt->user_regs.r2_usr = dom->devicetree_blob ?
+ dom->devicetree_seg.vstart : 0xffffffff;
ctxt->sctlr = SCTLR_GUEST_INIT;
@@ -191,6 +192,25 @@ int arch_setup_meminit(struct xc_dom_image *dom)
0, 0, &dom->p2m_host[i]);
}
+ if ( dom->devicetree_blob )
+ {
+ const uint64_t rambase = dom->rambase_pfn << XC_PAGE_SHIFT;
+ const uint64_t ramend = rambase + ( dom->total_pages << XC_PAGE_SHIFT
);
+ const uint64_t dtbsize = ( dom->devicetree_size + 3 ) & ~0x3;
+
+ /* Place at 128MB if there is sufficient RAM */
+ if ( ramend >= rambase + 128*1024*1024 + dtbsize )
+ dom->devicetree_seg.vstart = rambase + 128*1024*1024;
+ else /* otherwise at top of RAM */
+ dom->devicetree_seg.vstart = ramend - dtbsize;
+
+ dom->devicetree_seg.vend =
+ dom->devicetree_seg.vstart + dom->devicetree_size;
+ DOMPRINTF("%s: devicetree: 0x%" PRIx64 " -> 0x%" PRIx64 "",
+ __FUNCTION__,
+ dom->devicetree_seg.vstart, dom->devicetree_seg.vend);
+ }
+
return 0;
}
diff --git a/tools/libxc/xc_dom_core.c b/tools/libxc/xc_dom_core.c
index 5a22fd0c..705694a 100644
--- a/tools/libxc/xc_dom_core.c
+++ b/tools/libxc/xc_dom_core.c
@@ -671,6 +671,7 @@ struct xc_dom_image *xc_dom_allocate(xc_interface *xch,
dom->max_kernel_size = XC_DOM_DECOMPRESS_MAX;
dom->max_ramdisk_size = XC_DOM_DECOMPRESS_MAX;
+ dom->max_devicetree_size = XC_DOM_DECOMPRESS_MAX;
if ( cmdline )
dom->cmdline = xc_dom_strdup(dom, cmdline);
@@ -706,6 +707,13 @@ int xc_dom_ramdisk_max_size(struct xc_dom_image *dom,
size_t sz)
return 0;
}
+int xc_dom_devicetree_max_size(struct xc_dom_image *dom, size_t sz)
+{
+ DOMPRINTF("%s: devicetree_max_size=%zx", __FUNCTION__, sz);
+ dom->max_devicetree_size = sz;
+ return 0;
+}
+
int xc_dom_kernel_file(struct xc_dom_image *dom, const char *filename)
{
DOMPRINTF("%s: filename=\"%s\"", __FUNCTION__, filename);
@@ -729,6 +737,23 @@ int xc_dom_ramdisk_file(struct xc_dom_image *dom, const
char *filename)
return 0;
}
+int xc_dom_devicetree_file(struct xc_dom_image *dom, const char *filename)
+{
+#if defined (__arm__) || defined(__aarch64__)
+ DOMPRINTF("%s: filename=\"%s\"", __FUNCTION__, filename);
+ dom->devicetree_blob =
+ xc_dom_malloc_filemap(dom, filename, &dom->devicetree_size,
+ dom->max_devicetree_size);
+
+ if ( dom->devicetree_blob == NULL )
+ return -1;
+ return 0;
+#else
+ errno = -EINVAL;
+ return -1;
+#endif
+}
+
int xc_dom_kernel_mem(struct xc_dom_image *dom, const void *mem, size_t
memsize)
{
DOMPRINTF_CALLED(dom->xch);
@@ -747,6 +772,15 @@ int xc_dom_ramdisk_mem(struct xc_dom_image *dom, const
void *mem,
return 0;
}
+int xc_dom_devicetree_mem(struct xc_dom_image *dom, const void *mem,
+ size_t memsize)
+{
+ DOMPRINTF_CALLED(dom->xch);
+ dom->devicetree_blob = (void *)mem;
+ dom->devicetree_size = memsize;
+ return 0;
+}
+
int xc_dom_parse_image(struct xc_dom_image *dom)
{
int i;
@@ -925,6 +959,25 @@ int xc_dom_build_image(struct xc_dom_image *dom)
memcpy(ramdiskmap, dom->ramdisk_blob, dom->ramdisk_size);
}
+ /* load devicetree */
+ if ( dom->devicetree_blob )
+ {
+ void *devicetreemap;
+
+ if ( xc_dom_alloc_segment(dom, &dom->devicetree_seg, "devicetree",
+ dom->devicetree_seg.vstart,
+ dom->devicetree_size) != 0 )
+ goto err;
+ devicetreemap = xc_dom_seg_to_ptr(dom, &dom->devicetree_seg);
+ if ( devicetreemap == NULL )
+ {
+ DOMPRINTF("%s: xc_dom_seg_to_ptr(dom, &dom->devicetree_seg) =>
NULL",
+ __FUNCTION__);
+ goto err;
+ }
+ memcpy(devicetreemap, dom->devicetree_blob, dom->devicetree_size);
+ }
+
/* allocate other pages */
if ( dom->arch_hooks->alloc_magic_pages(dom) != 0 )
goto err;
--
1.7.10.4
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