[PATCH RFC 04/12] xen/x86: split Dom0 build into PV and PVHv2

[Roger Pau Monne <roger.pau@citrix.com>]

Split the Dom0 builder into two different functions, one for PV (and classic
PVH), and another one for PVHv2. Introduce a new command line parameter,
dom0hvm in order to request the creation of a PVHv2 Dom0.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
---
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
---
 xen/arch/x86/domain_build.c | 27 ++++++++++++++++++++++++++-
 xen/arch/x86/setup.c        |  9 +++++++++
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/domain_build.c b/xen/arch/x86/domain_build.c
index 09d79be..c0ef40f 100644
--- a/xen/arch/x86/domain_build.c
+++ b/xen/arch/x86/domain_build.c
@@ -952,7 +952,7 @@ static int __init setup_permissions(struct domain *d)
     return rc;
 }
 
-int __init construct_dom0(
+static int __init construct_dom0_pv(
     struct domain *d,
     const module_t *image, unsigned long image_headroom,
     module_t *initrd,
@@ -1647,6 +1647,31 @@ out:
     return rc;
 }
 
+static int __init construct_dom0_hvm(struct domain *d, const module_t *image,
+                                     unsigned long image_headroom,
+                                     module_t *initrd,
+                                     void *(*bootstrap_map)(const module_t *),
+                                     char *cmdline)
+{
+
+    printk("** Building a PVH Dom0 **\n");
+
+    return 0;
+}
+
+int __init construct_dom0(struct domain *d, const module_t *image,
+                          unsigned long image_headroom, module_t *initrd,
+                          void *(*bootstrap_map)(const module_t *),
+                          char *cmdline)
+{
+
+    return is_hvm_domain(d) ?
+            construct_dom0_hvm(d, image, image_headroom, initrd,
+                               bootstrap_map, cmdline) :
+            construct_dom0_pv(d, image, image_headroom, initrd, bootstrap_map,
+                              cmdline);
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 217c775..8d9c3a0 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -75,6 +75,10 @@ unsigned long __read_mostly cr4_pv32_mask;
 static bool_t __initdata opt_dom0pvh;
 boolean_param("dom0pvh", opt_dom0pvh);
 
+/* Boot dom0 in HVM mode */
+static bool_t __initdata opt_dom0hvm;
+boolean_param("dom0hvm", opt_dom0hvm);
+
 /* **** Linux config option: propagated to domain0. */
 /* "acpi=off":    Sisables both ACPI table parsing and interpreter. */
 /* "acpi=force":  Override the disable blacklist.                   */
@@ -1492,6 +1496,11 @@ void __init noreturn __start_xen(unsigned long mbi_p)
     if ( opt_dom0pvh )
         domcr_flags |= DOMCRF_pvh | DOMCRF_hap;
 
+    if ( opt_dom0hvm ) {
+        domcr_flags |= DOMCRF_hvm | (hvm_funcs.hap_supported ? DOMCRF_hap : 0);
+        config.emulation_flags = XEN_X86_EMU_LAPIC|XEN_X86_EMU_IOAPIC;
+    }
+
     /*
      * Create initial domain 0.
      * x86 doesn't support arch-configuration. So it's fine to pass
-- 
2.7.4 (Apple Git-66)


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