[Xen-devel] [RFC][v2][PATCH 1/6] xen:x86: record RMRR mappings

[Tiejun Chen <tiejun.chen@xxxxxxxxx>]

We will expose RMRR mappings to VM so need to record all
RMRR mappings firstly.

Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>
---
 xen/arch/x86/e820.c                |  2 ++
 xen/drivers/passthrough/vtd/dmar.c | 14 ++++++++++++++
 xen/include/asm-x86/e820.h         |  3 +++
 3 files changed, 19 insertions(+)

diff --git a/xen/arch/x86/e820.c b/xen/arch/x86/e820.c
index 55fe0d6..db44afd 100644
--- a/xen/arch/x86/e820.c
+++ b/xen/arch/x86/e820.c
@@ -34,6 +34,8 @@ static bool_t __initdata e820_verbose;
 boolean_param("e820-verbose", e820_verbose);
 
 struct e820map e820;
+/* Used to record RMRR mapping. */
+rmrr_maps_t rmrr_maps;
 
 /*
  * This function checks if the entire range <start,end> is mapped with type.
diff --git a/xen/drivers/passthrough/vtd/dmar.c 
b/xen/drivers/passthrough/vtd/dmar.c
index 1152c3a..24321e3 100644
--- a/xen/drivers/passthrough/vtd/dmar.c
+++ b/xen/drivers/passthrough/vtd/dmar.c
@@ -29,6 +29,7 @@
 #include <xen/pci.h>
 #include <xen/pci_regs.h>
 #include <asm/string.h>
+#include <asm/e820.h>
 #include "dmar.h"
 #include "iommu.h"
 #include "extern.h"
@@ -80,6 +81,18 @@ static int __init acpi_register_rmrr_unit(struct 
acpi_rmrr_unit *rmrr)
     return 0;
 }
 
+/* Record RMRR mapping to ready expose VM. */
+static int __init rmrr_maps_register(struct acpi_rmrr_unit *rmrr)
+{
+    rmrr_maps.map[rmrr_maps.nr_map].addr = rmrr->base_address;
+    rmrr_maps.map[rmrr_maps.nr_map].size = rmrr->end_address -
+                                           rmrr->base_address;
+    rmrr_maps.map[rmrr_maps.nr_map].type = E820_RESERVED;
+    rmrr_maps.nr_map++;
+
+    return 0;
+}
+
 static void __init disable_all_dmar_units(void)
 {
     struct acpi_drhd_unit *drhd, *_drhd;
@@ -675,6 +688,7 @@ acpi_parse_one_rmrr(struct acpi_dmar_header *header)
                         " end_address %"PRIx64"\n",
                         rmrru->base_address, rmrru->end_address);
             acpi_register_rmrr_unit(rmrru);
+            rmrr_maps_register(rmrru);
         }
     }
 
diff --git a/xen/include/asm-x86/e820.h b/xen/include/asm-x86/e820.h
index 71a804c..74262c9 100644
--- a/xen/include/asm-x86/e820.h
+++ b/xen/include/asm-x86/e820.h
@@ -23,6 +23,8 @@ struct e820map {
     struct e820entry map[E820MAX];
 };
 
+typedef struct e820map rmrr_maps_t;
+
 extern int e820_all_mapped(u64 start, u64 end, unsigned type);
 extern int reserve_e820_ram(struct e820map *e820, uint64_t s, uint64_t e);
 extern int e820_change_range_type(
@@ -32,6 +34,7 @@ extern int e820_add_range(
     struct e820map *, uint64_t s, uint64_t e, uint32_t type);
 extern unsigned long init_e820(const char *, struct e820entry *, int *);
 extern struct e820map e820;
+extern rmrr_maps_t rmrr_maps;
 
 /* These symbols live in the boot trampoline. */
 extern struct e820entry e820map[];
-- 
1.9.1


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