[Xen-devel] [PATCH v2 16/17] libxc/xc_dom_arm: Copy ACPI tables to guest space

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

Copy all the ACPI tables to guest space so that UEFI or guest could
access them.

Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
---
 tools/libxc/xc_dom_arm.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/tools/libxc/xc_dom_arm.c b/tools/libxc/xc_dom_arm.c
index 64a8b67..6a0a5b7 100644
--- a/tools/libxc/xc_dom_arm.c
+++ b/tools/libxc/xc_dom_arm.c
@@ -63,6 +63,47 @@ static int setup_pgtables_arm(struct xc_dom_image *dom)
 
 /* ------------------------------------------------------------------------ */
 
+static int xc_dom_copy_acpi(struct xc_dom_image *dom)
+{
+    int rc, i;
+    uint32_t pages_num = ROUNDUP(dom->acpitable_size, XC_PAGE_SHIFT) >>
+                         XC_PAGE_SHIFT;
+    const xen_pfn_t base = GUEST_ACPI_BASE >> XC_PAGE_SHIFT;
+    xen_pfn_t *p2m;
+    void *acpi_pages;
+
+    p2m = malloc(pages_num * sizeof(*p2m));
+    for (i = 0; i < pages_num; i++)
+        p2m[i] = base + i;
+
+    rc = xc_domain_populate_physmap_exact(dom->xch, dom->guest_domid,
+                                          pages_num, 0, 0, p2m);
+    if ( rc )
+    {
+        DOMPRINTF("%s: xc_domain_populate_physmap_exact failed with %d",
+                  __FUNCTION__, rc);
+        goto out;
+    }
+
+    acpi_pages = xc_map_foreign_range(dom->xch, dom->guest_domid,
+                                      PAGE_SIZE * pages_num,
+                                      PROT_READ | PROT_WRITE, base);
+    if ( !acpi_pages )
+    {
+        DOMPRINTF("%s Can't map acpi_pages", __FUNCTION__);
+        rc = -1;
+        goto out;
+    }
+
+    memcpy(acpi_pages, dom->acpitable_blob, dom->acpitable_size);
+
+out:
+    munmap(acpi_pages, pages_num * PAGE_SIZE);
+    free(p2m);
+
+    return rc;
+}
+
 static int alloc_magic_pages(struct xc_dom_image *dom)
 {
     int rc, i;
@@ -100,6 +141,16 @@ static int alloc_magic_pages(struct xc_dom_image *dom)
     xc_hvm_param_set(dom->xch, dom->guest_domid, HVM_PARAM_STORE_EVTCHN,
             dom->xenstore_evtchn);
 
+    if ( dom->acpitable_blob && dom->acpitable_size > 0 )
+    {
+        rc = xc_dom_copy_acpi(dom);
+        if ( rc != 0 )
+        {
+            DOMPRINTF("Unable to copy ACPI tables");
+            return rc;
+        }
+    }
+
     return 0;
 }
 
-- 
2.0.4



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