[Xen-devel] [PATCH 6 of 6 V6] libxl: Introduce a new guest config file parameter

[Wei Wang <wei.wang2@xxxxxxx>]

# HG changeset patch
# User Wei Wang <wei.wang2@xxxxxxx>
# Date 1331210225 -3600
# Node ID 4c16ebeae0adace4493299b2f6d9c74ce8e6f889
# Parent  0a1de2dea27370d71d2572869d363d9e5833648e
libxl: Introduce a new guest config file parameter

Use guest_iommu = {1,0} to enable or disable guest iommu emulation.
Default value is 0. Regression tests have been done to make sure
it does not break non-iommuv2 systems.

Signed-off-by: Wei Wang <wei.wang2@xxxxxxx>
Acked-by: Ian Jackson<ian.jackson@xxxxxxxxxxxxx>

diff -r 0a1de2dea273 -r 4c16ebeae0ad docs/man/xl.cfg.pod.5
--- a/docs/man/xl.cfg.pod.5     Thu Mar 08 13:37:02 2012 +0100
+++ b/docs/man/xl.cfg.pod.5     Thu Mar 08 13:37:05 2012 +0100
@@ -851,6 +851,11 @@ certainly belong in a more appropriate s
 
 Enable graphics device PCI passthrough. XXX which device is passed through ?
 
+=item B<guest_iommu=BOOLEAN>
+
+Enable a virtual iommu device for hvm guest. It should be enabled to 
+passthrough AMD HD7900 series GPGPU.
+
 =item B<nomigrate=BOOLEAN>
 
 Disable migration of this domain.  This enables certain other features
diff -r 0a1de2dea273 -r 4c16ebeae0ad tools/libxl/libxl_create.c
--- a/tools/libxl/libxl_create.c        Thu Mar 08 13:37:02 2012 +0100
+++ b/tools/libxl/libxl_create.c        Thu Mar 08 13:37:05 2012 +0100
@@ -146,6 +146,7 @@ int libxl__domain_build_info_setdefault(
         libxl_defbool_setdefault(&b_info->u.hvm.hpet,               true);
         libxl_defbool_setdefault(&b_info->u.hvm.vpt_align,          true);
         libxl_defbool_setdefault(&b_info->u.hvm.nested_hvm,         false);
+        libxl_defbool_setdefault(&b_info->u.hvm.guest_iommu,        false);
         libxl_defbool_setdefault(&b_info->u.hvm.incr_generationid,  false);
         libxl_defbool_setdefault(&b_info->u.hvm.usb,                false);
         libxl_defbool_setdefault(&b_info->u.hvm.xen_platform_pci,   true);
@@ -237,13 +238,15 @@ int libxl__domain_build(libxl__gc *gc,
         vments[4] = "start_time";
         vments[5] = libxl__sprintf(gc, "%lu.%02d", 
start_time.tv_sec,(int)start_time.tv_usec/10000);
 
-        localents = libxl__calloc(gc, 7, sizeof(char *));
+        localents = libxl__calloc(gc, 9, sizeof(char *));
         localents[0] = "platform/acpi";
         localents[1] = libxl_defbool_val(info->u.hvm.acpi) ? "1" : "0";
         localents[2] = "platform/acpi_s3";
         localents[3] = libxl_defbool_val(info->u.hvm.acpi_s3) ? "1" : "0";
         localents[4] = "platform/acpi_s4";
         localents[5] = libxl_defbool_val(info->u.hvm.acpi_s4) ? "1" : "0";
+        localents[6] = "guest_iommu";
+        localents[7] = libxl_defbool_val(info->u.hvm.guest_iommu) ? "1" : "0";
 
         break;
     case LIBXL_DOMAIN_TYPE_PV:
diff -r 0a1de2dea273 -r 4c16ebeae0ad tools/libxl/libxl_types.idl
--- a/tools/libxl/libxl_types.idl       Thu Mar 08 13:37:02 2012 +0100
+++ b/tools/libxl/libxl_types.idl       Thu Mar 08 13:37:05 2012 +0100
@@ -268,6 +268,7 @@ libxl_domain_build_info = Struct("domain
                                        ("vpt_align",        libxl_defbool),
                                        ("timer_mode",       libxl_timer_mode),
                                        ("nested_hvm",       libxl_defbool),
+                                       ("guest_iommu",      libxl_defbool),
                                        ("incr_generationid",libxl_defbool),
                                        ("nographic",        libxl_defbool),
                                        ("stdvga",           libxl_defbool),
diff -r 0a1de2dea273 -r 4c16ebeae0ad tools/libxl/xl_cmdimpl.c
--- a/tools/libxl/xl_cmdimpl.c  Thu Mar 08 13:37:02 2012 +0100
+++ b/tools/libxl/xl_cmdimpl.c  Thu Mar 08 13:37:05 2012 +0100
@@ -749,6 +749,7 @@ static void parse_config_data(const char
         }
 
         xlu_cfg_get_defbool(config, "nestedhvm", &b_info->u.hvm.nested_hvm, 0);
+        xlu_cfg_get_defbool(config, "guest_iommu", &b_info->u.hvm.guest_iommu, 
0);
         break;
     case LIBXL_DOMAIN_TYPE_PV:
     {


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