[Xen-devel] [PATCH v2] tools/libxl: mark special pages as reserved in e820 map for PVH

[Juergen Gross <jgross@xxxxxxxx>]

The "special pages" for PVH guests include the frames for console and
Xenstore ring buffers. Those have to be marked as "Reserved" in the
guest's E820 map, as otherwise conflicts might arise later e.g. when
hotplugging memory into the guest.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
This is a bugfix for PVH guests. Please consider for 4.10.
---
 tools/libxl/libxl_x86.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/libxl/libxl_x86.c b/tools/libxl/libxl_x86.c
index 5f91fe4f92..d82013f6ed 100644
--- a/tools/libxl/libxl_x86.c
+++ b/tools/libxl/libxl_x86.c
@@ -530,6 +530,9 @@ int libxl__arch_domain_construct_memmap(libxl__gc *gc,
         if (d_config->rdms[i].policy != LIBXL_RDM_RESERVE_POLICY_INVALID)
             e820_entries++;
 
+    /* Add mmio entry for PVH. */
+    if (dom->mmio_size && d_config->b_info.type == LIBXL_DOMAIN_TYPE_PVH)
+        e820_entries++;
 
     /* If we should have a highmem range. */
     if (highmem_size)
@@ -564,6 +567,14 @@ int libxl__arch_domain_construct_memmap(libxl__gc *gc,
         nr++;
     }
 
+    /* mmio area */
+    if (dom->mmio_size && d_config->b_info.type == LIBXL_DOMAIN_TYPE_PVH) {
+        e820[nr].addr = dom->mmio_start;
+        e820[nr].size = dom->mmio_size;
+        e820[nr].type = E820_RESERVED;
+        nr++;
+    }
+
     for (i = 0; i < MAX_ACPI_MODULES; i++) {
         if (dom->acpi_modules[i].length) {
             e820[nr].addr = dom->acpi_modules[i].guest_addr_out & ~(page_size 
- 1);
-- 
2.12.3


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