[Xen-devel] [PATCH v2] txt: 4/5 - hypervisor integrity on S3

["Cihula, Joseph" <joseph.cihula@xxxxxxxxx>]

When launched from tboot, utilise tboot interface to provide integrity 
protection to the hypervisor during S3

Signed-off-by: Joseph Cihula <joseph.cihula@xxxxxxxxx>
ACKed-by: Shane Wang <shane.wang@xxxxxxxxx>

diff -r 196ed4d1e316 -r 664c5cd3827b xen/arch/x86/tboot.c
--- a/xen/arch/x86/tboot.c      Wed Jan 28 22:12:49 2009 -0800
+++ b/xen/arch/x86/tboot.c      Wed Jan 28 22:32:25 2009 -0800
@@ -17,6 +17,8 @@ tboot_shared_t *g_tboot_shared;
 tboot_shared_t *g_tboot_shared;

 static const uuid_t tboot_shared_uuid = TBOOT_SHARED_UUID;
+
+extern char __init_begin[], __per_cpu_start[], __per_cpu_end[], __bss_start[];

 /*
  * TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE)
@@ -76,6 +78,25 @@ void tboot_shutdown(uint32_t shutdown_ty
     g_tboot_shared->shutdown_type = shutdown_type;

     local_irq_disable();
+
+    /* if this is S3 then set regions to MAC */
+    if ( shutdown_type == TB_SHUTDOWN_S3 ) {
+        g_tboot_shared->num_mac_regions = 4;
+        /* S3 resume code (and other real mode trampoline code) */
+        g_tboot_shared->mac_regions[0].start =
+            (uint64_t)bootsym_phys(trampoline_start);
+        g_tboot_shared->mac_regions[0].end =
+            (uint64_t)bootsym_phys(trampoline_end);
+        /* hypervisor code + data */
+        g_tboot_shared->mac_regions[1].start = (uint64_t)__pa(&_stext);
+        g_tboot_shared->mac_regions[1].end = (uint64_t)__pa(&__init_begin);
+        /* per-cpu data */
+        g_tboot_shared->mac_regions[2].start = 
(uint64_t)__pa(&__per_cpu_start);
+        g_tboot_shared->mac_regions[2].end = (uint64_t)__pa(&__per_cpu_end);
+        /* bss */
+        g_tboot_shared->mac_regions[3].start = (uint64_t)__pa(&__bss_start);
+        g_tboot_shared->mac_regions[3].end = (uint64_t)__pa(&_end);
+    }

     /* Create identity map for tboot shutdown code. */
     map_base = PFN_DOWN(g_tboot_shared->tboot_base);
diff -r 196ed4d1e316 -r 664c5cd3827b xen/include/asm-x86/tboot.h
--- a/xen/include/asm-x86/tboot.h       Wed Jan 28 22:12:49 2009 -0800
+++ b/xen/include/asm-x86/tboot.h       Wed Jan 28 22:32:25 2009 -0800
@@ -51,6 +51,12 @@ typedef struct __packed {

 /* used to communicate between tboot and the launched kernel (i.e. Xen) */

+#define MAX_TB_MAC_REGIONS      32
+typedef struct __packed {
+    uint64_t  start;
+    uint64_t  end;
+} tboot_mac_region_t;
+
 /* GAS - Generic Address Structure (ACPI 2.0+) */
 typedef struct __packed {
        uint8_t  space_id;
@@ -83,6 +89,9 @@ typedef struct __packed {
               acpi_sinfo;        /* where kernel put acpi sleep info in Sx */
     uint32_t  tboot_base;        /* starting addr for tboot */
     uint32_t  tboot_size;        /* size of tboot */
+    uint8_t   num_mac_regions;   /* number mem regions to MAC on S3 */
+                                 /* contig regions memory to MAC on S3 */
+    tboot_mac_region_t mac_regions[MAX_TB_MAC_REGIONS];
 } tboot_shared_t;

 #define TB_SHUTDOWN_REBOOT      0

xen-txt-04c-hypervisor_s3_integrity.patch
Description: xen-txt-04c-hypervisor_s3_integrity.patch

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