xen/xen-pass-kernel-initrd-to-qemu.patch

From 865406533fe7a163acd5ed299628f1dc8d475803 Mon Sep 17 00:00:00 2001
From: Chunyan Liu <cyliu@suse.com>
Date: Wed, 28 May 2014 14:36:54 +0800
Subject: [PATCH 1/2] xen: pass kernel initrd to qemu

xen side patch to support xen HVM direct kernel boot:
support 'kernel', 'ramdisk', 'root', 'extra' in HVM config file,
parse config file, pass -kernel, -initrd, -append parameters to qemu.
It's working with seabios and non-stubdom. Rombios and stubdom cases
are currently not supported.

[config example]
kernel="/mnt/vmlinuz-3.0.13-0.27-default"
ramdisk="/mnt/initrd-3.0.13-0.27-default"
root="/dev/hda2"
extra="console=tty0 console=ttyS0"
disk=[ 'file:/mnt/images/bjz_04_sles11_sp2/disk0.raw,hda,w', ]

Signed-off-by: Chunyan Liu <cyliu@suse.com>
---
 docs/man/xl.cfg.pod.5       | 50 ++++++++++++++++++++++++----------------
 tools/libxl/libxl_dm.c      | 15 ++++++++++++
 tools/libxl/libxl_types.idl |  3 +++
 tools/libxl/xl_cmdimpl.c    | 56 +++++++++++++++++++++++++++------------------
 4 files changed, 82 insertions(+), 42 deletions(-)

Index: xen-4.4.0-testing/docs/man/xl.cfg.pod.5
===================================================================
--- xen-4.4.0-testing.orig/docs/man/xl.cfg.pod.5
+++ xen-4.4.0-testing/docs/man/xl.cfg.pod.5
@@ -296,6 +296,34 @@ Action to take if the domain crashes.  D
 
 =back
 
+=head3 Direct Kernel Boot
+
+Currently, direct kernel boot can be supported by PV guests, and HVM guests
+in some configuration. For HVM guests, in case of stubdom-dm and old rombios,
+direct kernel boot is not supported.
+
+=over 4
+
+=item B<kernel="PATHNAME">
+
+Load the specified file as the kernel image.
+
+=item B<ramdisk="PATHNAME">
+
+Load the specified file as the ramdisk.
+
+=item B<root="STRING">
+
+Append B<root="STRING"> to the kernel command line (Note: it is guest
+specific what meaning this has).
+
+=item B<extra="STRING">
+
+Append B<STRING> to the kernel command line. (Note: it is guest
+specific what meaning this has).
+
+=back
+
 =head3 Other Options
 
 =over 4
@@ -655,20 +683,12 @@ The following options apply only to Para
 
 =over 4
 
-=item B<kernel="PATHNAME">
-
-Load the specified file as the kernel image.  Either B<kernel> or
-B<bootloader> must be specified for PV guests.
-
-=item B<ramdisk="PATHNAME">
-
-Load the specified file as the ramdisk.
-
 =item B<bootloader="PROGRAM">
 
 Run C<PROGRAM> to find the kernel image and ramdisk to use.  Normally
 C<PROGRAM> would be C<pygrub>, which is an emulation of
-grub/grub2/syslinux.
+grub/grub2/syslinux. Either B<kernel> or B<bootloader> must be specified
+for PV guests.
 
 =item B<bootloader_args=[ "ARG", "ARG", ...]>
 
@@ -676,16 +696,6 @@ Append B<ARG>s to the arguments to the B
 program. Alternatively if the argument is a simple string then it will
 be split into words at whitespace (this second option is deprecated).
 
-=item B<root="STRING">
-
-Append B<root="STRING"> to the kernel command line (Note: it is guest
-specific what meaning this has).
-
-=item B<extra="STRING">
-
-Append B<STRING> to the kernel command line. Note: it is guest
-specific what meaning this has).
-
 =item B<e820_host=BOOLEAN>
 
 Selects whether to expose the host e820 (memory map) to the guest via
Index: xen-4.4.0-testing/tools/libxl/libxl_dm.c
===================================================================
--- xen-4.4.0-testing.orig/tools/libxl/libxl_dm.c
+++ xen-4.4.0-testing/tools/libxl/libxl_dm.c
@@ -196,6 +196,12 @@ static char ** libxl__build_device_model
         int nr_set_cpus = 0;
         char *s;
 
+        if (b_info->u.hvm.kernel) {
+            LOG(ERROR, "direct kernel boot is not supported by %s",
+                dm);
+            return NULL;
+        }
+
         if (b_info->u.hvm.serial) {
             flexarray_vappend(dm_args, "-serial", b_info->u.hvm.serial, NULL);
         }
@@ -487,6 +493,15 @@ static char ** libxl__build_device_model
     if (b_info->type == LIBXL_DOMAIN_TYPE_HVM) {
         int ioemu_nics = 0;
 
+        if (b_info->u.hvm.kernel)
+            flexarray_vappend(dm_args, "-kernel", b_info->u.hvm.kernel, NULL);
+
+        if (b_info->u.hvm.ramdisk)
+            flexarray_vappend(dm_args, "-initrd", b_info->u.hvm.ramdisk, NULL);
+
+        if (b_info->u.hvm.cmdline)
+            flexarray_vappend(dm_args, "-append", b_info->u.hvm.cmdline, NULL);
+
         if (b_info->u.hvm.serial) {
             flexarray_vappend(dm_args, "-serial", b_info->u.hvm.serial, NULL);
         }
Index: xen-4.4.0-testing/tools/libxl/libxl_types.idl
===================================================================
--- xen-4.4.0-testing.orig/tools/libxl/libxl_types.idl
+++ xen-4.4.0-testing/tools/libxl/libxl_types.idl
@@ -335,6 +335,9 @@ libxl_domain_build_info = Struct("domain
     ("event_channels",   uint32),
     ("u", KeyedUnion(None, libxl_domain_type, "type",
                 [("hvm", Struct(None, [("firmware",         string),
+                                       ("kernel",           string),
+                                       ("cmdline",          string),
+                                       ("ramdisk",          string),
                                        ("bios",             libxl_bios_type),
                                        ("pae",              libxl_defbool),
                                        ("apic",             libxl_defbool),
Index: xen-4.4.0-testing/tools/libxl/xl_cmdimpl.c
===================================================================
--- xen-4.4.0-testing.orig/tools/libxl/xl_cmdimpl.c
+++ xen-4.4.0-testing/tools/libxl/xl_cmdimpl.c
@@ -848,6 +848,29 @@ static void parse_top_level_sdl_options(
     xlu_cfg_replace_string (config, "xauthority", &sdl->xauthority, 0);
 }
 
+static char *parse_cmdline(XLU_Config *config)
+{
+    char *cmdline = NULL;
+    const char *root = NULL, *extra = "";
+
+    xlu_cfg_get_string (config, "root", &root, 0);
+    xlu_cfg_get_string (config, "extra", &extra, 0);
+
+    if (root) {
+        if (asprintf(&cmdline, "root=%s %s", root, extra) == -1)
+            cmdline = NULL;
+    } else {
+        cmdline = strdup(extra);
+    }
+
+    if ((root || extra) && !cmdline) {
+        fprintf(stderr, "Failed to allocate memory for cmdline\n");
+        exit(1);
+    }
+
+    return cmdline;
+}
+
 static void parse_config_data(const char *config_source,
                               const char *config_data,
                               int config_len,
@@ -1129,9 +1152,16 @@ static void parse_config_data(const char
 
     switch(b_info->type) {
     case LIBXL_DOMAIN_TYPE_HVM:
-        if (!xlu_cfg_get_string (config, "kernel", &buf, 0))
-            fprintf(stderr, "WARNING: ignoring \"kernel\" directive for HVM guest. "
-                    "Use \"firmware_override\" instead if you really want a non-default firmware\n");
+        if (!xlu_cfg_get_string (config, "kernel", &buf, 0)) {
+            if (strstr(buf, "hvmloader"))
+                fprintf(stderr, "WARNING: ignoring \"kernel\" directive for HVM guest. "
+                        "Use \"firmware_override\" instead if you really want a non-default firmware\n");
+            else
+                b_info->u.hvm.kernel = strdup(buf);
+        }
+
+        b_info->u.hvm.cmdline = parse_cmdline(config);
+        xlu_cfg_replace_string (config, "ramdisk", &b_info->u.hvm.ramdisk, 0);
 
         xlu_cfg_replace_string (config, "firmware_override",
                                 &b_info->u.hvm.firmware, 0);
@@ -1183,26 +1213,8 @@ static void parse_config_data(const char
         break;
     case LIBXL_DOMAIN_TYPE_PV:
     {
-        char *cmdline = NULL;
-        const char *root = NULL, *extra = "";
-
         xlu_cfg_replace_string (config, "kernel", &b_info->u.pv.kernel, 0);
 
-        xlu_cfg_get_string (config, "root", &root, 0);
-        xlu_cfg_get_string (config, "extra", &extra, 0);
-
-        if (root) {
-            if (asprintf(&cmdline, "root=%s %s", root, extra) == -1)
-                cmdline = NULL;
-        } else {
-            cmdline = strdup(extra);
-        }
-
-        if ((root || extra) && !cmdline) {
-            fprintf(stderr, "Failed to allocate memory for cmdline\n");
-            exit(1);
-        }
-
         xlu_cfg_replace_string (config, "bootloader", &b_info->u.pv.bootloader, 0);
         switch (xlu_cfg_get_list_as_string_list(config, "bootloader_args",
                                       &b_info->u.pv.bootloader_args, 1))
@@ -1230,7 +1242,7 @@ static void parse_config_data(const char
             exit(1);
         }
 
-        b_info->u.pv.cmdline = cmdline;
+        b_info->u.pv.cmdline = parse_cmdline(config);
         xlu_cfg_replace_string (config, "ramdisk", &b_info->u.pv.ramdisk, 0);
         break;
     }