[v2,12/15] x86/hyperlaunch: specify dom0 mode with device tree

Commit Message

Daniel P. Smith Dec. 26, 2024, 4:57 p.m. UTC

Enable selecting the mode in which the domain will be built and ran. This
includes:

- whether it will be either a 32/64 bit domain
- if it will be run as a PV or HVM domain
- and if it will require a device model (not applicable for dom0)

In the device tree, this will be represented as a bit map that will be carried
through into struct boot_domain.

Signed-off-by: Daniel P. Smith <[e-mail]>
Reviewed-by: Jason Andryuk <[e-mail]>
---
Changes since v1:
- switched to nested else if
- dropped ternary op for reporting domain name
- switch to strncmp for the check for mode prop
- drop BUILD_MODE_LONG until PV construction series
---
 xen/arch/x86/domain-builder/fdt.c     | 19 +++++++++++++++++++
 xen/arch/x86/include/asm/bootdomain.h |  5 +++++
 xen/arch/x86/setup.c                  |  3 ++-
 3 files changed, 26 insertions(+), 1 deletion(-)

Patch

diff --git a/xen/arch/x86/domain-builder/fdt.c b/xen/arch/x86/domain-builder/fdt.c
index efce0927c645..db584ba78e92 100644
--- a/xen/arch/x86/domain-builder/fdt.c
+++ b/xen/arch/x86/domain-builder/fdt.c
@@ -94,6 +94,25 @@  static int __init process_domain_node(
             bd->domid = (domid_t)val;
             printk("  domid: %d\n", bd->domid);
         }
+        else if ( strncmp(prop_name, "mode", name_len) == 0 )
+        {
+            if ( fdt_prop_as_u32(prop, &bd->mode) != 0 )
+            {
+                printk("  failed processing mode for domain %s\n", name);
+                return -EINVAL;
+            }
+
+            printk("  mode: ");
+            if ( !(bd->mode & BUILD_MODE_PARAVIRT) )
+            {
+                if ( bd->mode & BUILD_MODE_ENABLE_DM )
+                    printk("HVM\n");
+                else
+                    printk("PVH\n");
+            }
+            else
+                printk("PV\n");
+        }
     }
 
     fdt_for_each_subnode(node, fdt, dom_node)
diff --git a/xen/arch/x86/include/asm/bootdomain.h b/xen/arch/x86/include/asm/bootdomain.h
index 101a0c643d74..5918aaf6bb63 100644
--- a/xen/arch/x86/include/asm/bootdomain.h
+++ b/xen/arch/x86/include/asm/bootdomain.h
@@ -15,6 +15,11 @@  struct boot_domain {
 
     domid_t domid;
 
+                                          /* On     | Off    */
+#define BUILD_MODE_PARAVIRT      (1 << 0) /* PV     | PVH/HVM */
+#define BUILD_MODE_ENABLE_DM     (1 << 1) /* HVM    | PVH     */
+    uint32_t mode;
+
     struct boot_module *kernel;
     struct boot_module *ramdisk;
 
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 027b224151d1..a87e122b5a61 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -1016,7 +1016,8 @@  static struct domain *__init create_dom0(struct boot_info *bi)
     struct boot_domain *bd = &bi->domains[0];
     struct domain *d;
 
-    if ( opt_dom0_pvh )
+    if ( opt_dom0_pvh ||
+         (bi->hyperlaunch_enabled && !(bd->mode & BUILD_MODE_PARAVIRT)) )
     {
         dom0_cfg.flags |= (XEN_DOMCTL_CDF_hvm |
                            ((hvm_hap_supported() && !opt_dom0_shadow) ?