[xen staging] xen: Refactor altp2m options into a structured format

[patchbot@xxxxxxx]

commit 5956e5b2d6f156233196c18ea3a7f9a722c6e30c
Author:     Petr Beneš <w1benny@xxxxxxxxx>
AuthorDate: Mon Jul 7 11:47:15 2025 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jul 7 11:47:15 2025 +0200

    xen: Refactor altp2m options into a structured format
    
    Encapsulate the altp2m options within a struct. This change is preparatory
    and sets the groundwork for introducing additional parameter in subsequent
    commit.
    
    Signed-off-by: Petr Beneš <w1benny@xxxxxxxxx>
    Acked-by: Christian Lindig <christian.lindig@xxxxxxxxx>
    Acked-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx> # arm
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx> # hypervisor
---
 tools/libs/light/libxl_create.c     | 6 +++---
 tools/ocaml/libs/xc/xenctrl_stubs.c | 4 +++-
 xen/arch/arm/domain.c               | 2 +-
 xen/arch/x86/domain.c               | 4 ++--
 xen/arch/x86/hvm/hvm.c              | 2 +-
 xen/include/public/domctl.h         | 4 +++-
 6 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/tools/libs/light/libxl_create.c b/tools/libs/light/libxl_create.c
index 9525d22312..8a85fba1cf 100644
--- a/tools/libs/light/libxl_create.c
+++ b/tools/libs/light/libxl_create.c
@@ -622,17 +622,17 @@ int libxl__domain_make(libxl__gc *gc, libxl_domain_config 
*d_config,
         LOG(DETAIL, "altp2m: %s", libxl_altp2m_mode_to_string(b_info->altp2m));
         switch(b_info->altp2m) {
         case LIBXL_ALTP2M_MODE_MIXED:
-            create.altp2m_opts |=
+            create.altp2m.opts |=
                 XEN_DOMCTL_ALTP2M_mode(XEN_DOMCTL_ALTP2M_mixed);
             break;
 
         case LIBXL_ALTP2M_MODE_EXTERNAL:
-            create.altp2m_opts |=
+            create.altp2m.opts |=
                 XEN_DOMCTL_ALTP2M_mode(XEN_DOMCTL_ALTP2M_external);
             break;
 
         case LIBXL_ALTP2M_MODE_LIMITED:
-            create.altp2m_opts |=
+            create.altp2m.opts |=
                 XEN_DOMCTL_ALTP2M_mode(XEN_DOMCTL_ALTP2M_limited);
             break;
 
diff --git a/tools/ocaml/libs/xc/xenctrl_stubs.c 
b/tools/ocaml/libs/xc/xenctrl_stubs.c
index 863ab3c778..b51fd66788 100644
--- a/tools/ocaml/libs/xc/xenctrl_stubs.c
+++ b/tools/ocaml/libs/xc/xenctrl_stubs.c
@@ -225,7 +225,9 @@ CAMLprim value stub_xc_domain_create(value xch_val, value 
wanted_domid, value co
                .max_maptrack_frames = Int_val(VAL_MAX_MAPTRACK_FRAMES),
                .grant_opts =
                    XEN_DOMCTL_GRANT_version(Int_val(VAL_MAX_GRANT_VERSION)),
-               .altp2m_opts = Int32_val(VAL_ALTP2M_OPTS),
+               .altp2m = {
+                       .opts = Int32_val(VAL_ALTP2M_OPTS),
+               },
                .vmtrace_size = vmtrace_size,
                .cpupool_id = Int32_val(VAL_CPUPOOL_ID),
        };
diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
index be58a23dd7..79a144e61b 100644
--- a/xen/arch/arm/domain.c
+++ b/xen/arch/arm/domain.c
@@ -693,7 +693,7 @@ int arch_sanitise_domain_config(struct 
xen_domctl_createdomain *config)
         return -EINVAL;
     }
 
-    if ( config->altp2m_opts )
+    if ( config->altp2m.opts )
     {
         dprintk(XENLOG_INFO, "Altp2m not supported\n");
         return -EINVAL;
diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index b67342797f..56c3816187 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -622,7 +622,7 @@ int arch_sanitise_domain_config(struct 
xen_domctl_createdomain *config)
     bool hap = config->flags & XEN_DOMCTL_CDF_hap;
     bool nested_virt = config->flags & XEN_DOMCTL_CDF_nested_virt;
     unsigned int max_vcpus;
-    unsigned int altp2m_mode = MASK_EXTR(config->altp2m_opts,
+    unsigned int altp2m_mode = MASK_EXTR(config->altp2m.opts,
                                          XEN_DOMCTL_ALTP2M_mode_mask);
 
     if ( hvm ? !hvm_enabled : !IS_ENABLED(CONFIG_PV) )
@@ -709,7 +709,7 @@ int arch_sanitise_domain_config(struct 
xen_domctl_createdomain *config)
         return -EINVAL;
     }
 
-    if ( config->altp2m_opts & ~XEN_DOMCTL_ALTP2M_mode_mask )
+    if ( config->altp2m.opts & ~XEN_DOMCTL_ALTP2M_mode_mask )
     {
         dprintk(XENLOG_INFO, "Invalid altp2m options selected: %#x\n",
                 config->flags);
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 056360d5fe..56c7de3977 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -665,7 +665,7 @@ int hvm_domain_initialise(struct domain *d,
     d->arch.hvm.params[HVM_PARAM_TRIPLE_FAULT_REASON] = SHUTDOWN_reboot;
 
     /* Set altp2m based on domctl flags. */
-    switch ( MASK_EXTR(config->altp2m_opts, XEN_DOMCTL_ALTP2M_mode_mask) )
+    switch ( MASK_EXTR(config->altp2m.opts, XEN_DOMCTL_ALTP2M_mode_mask) )
     {
     case XEN_DOMCTL_ALTP2M_mixed:
         d->arch.hvm.params[HVM_PARAM_ALTP2M] = XEN_ALTP2M_mixed;
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index be19ab5e26..a69dd96084 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -99,6 +99,7 @@ struct xen_domctl_createdomain {
 
     uint32_t grant_opts;
 
+    struct {
 /*
  * Enable altp2m mixed mode.
  *
@@ -115,7 +116,8 @@ struct xen_domctl_createdomain {
 /* Altp2m mode signaling uses bits [0, 1]. */
 #define XEN_DOMCTL_ALTP2M_mode_mask  (0x3U)
 #define XEN_DOMCTL_ALTP2M_mode(m)    ((m) & XEN_DOMCTL_ALTP2M_mode_mask)
-    uint32_t altp2m_opts;
+        uint32_t opts;
+    } altp2m;
 
     /* Per-vCPU buffer size in bytes.  0 to disable. */
     uint32_t vmtrace_size;
--
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