Keep a linked list of the memory regions created by igvm.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 backends/igvm.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/backends/igvm.c b/backends/igvm.c
index ee5ee74c7a66..1690fb334bf5 100644
--- a/backends/igvm.c
+++ b/backends/igvm.c
@@ -28,6 +28,11 @@ typedef struct QIgvmParameterData {
     uint32_t index;
 } QIgvmParameterData;
 
+typedef struct QIgvmMemoryRegion {
+    QTAILQ_ENTRY(QIgvmMemoryRegion) next;
+    MemoryRegion mr;
+} QIgvmMemoryRegion;
+
 /*
  * Some directives are specific to particular confidential computing platforms.
  * Define required types for each of those platforms here.
@@ -73,6 +78,7 @@ typedef struct QIgvm {
     uint32_t compatibility_mask;
     unsigned current_header_index;
     QTAILQ_HEAD(, QIgvmParameterData) parameter_data;
+    QTAILQ_HEAD(, QIgvmMemoryRegion) memory_regions;
     IgvmPlatformType platform_type;
 
     /*
@@ -185,7 +191,7 @@ static void *qigvm_prepare_memory(QIgvm *ctx, uint64_t addr, uint64_t size,
                                   int region_identifier, Error **errp)
 {
     ERRP_GUARD();
-    MemoryRegion *igvm_pages = NULL;
+    QIgvmMemoryRegion *pages = NULL;
     Int128 gpa_region_size;
     MemoryRegionSection mrs =
         memory_region_find(get_system_memory(), addr, size);
@@ -219,20 +225,21 @@ static void *qigvm_prepare_memory(QIgvm *ctx, uint64_t addr, uint64_t size,
          */
         g_autofree char *region_name =
             g_strdup_printf("igvm.%X", region_identifier);
-        igvm_pages = g_new0(MemoryRegion, 1);
+        pages = g_new0(QIgvmMemoryRegion, 1);
         if (ctx->cgs && ctx->cgs->require_guest_memfd) {
-            if (!memory_region_init_ram_guest_memfd(igvm_pages, NULL,
+            if (!memory_region_init_ram_guest_memfd(&pages->mr, NULL,
                                                     region_name, size, errp)) {
                 return NULL;
             }
         } else {
-            if (!memory_region_init_ram(igvm_pages, NULL, region_name, size,
+            if (!memory_region_init_ram(&pages->mr, NULL, region_name, size,
                                         errp)) {
                 return NULL;
             }
         }
-        memory_region_add_subregion(get_system_memory(), addr, igvm_pages);
-        return memory_region_get_ram_ptr(igvm_pages);
+        memory_region_add_subregion(get_system_memory(), addr, &pages->mr);
+        QTAILQ_INSERT_TAIL(&ctx->memory_regions, pages, next);
+        return memory_region_get_ram_ptr(&pages->mr);
     }
 }
 
@@ -928,6 +935,7 @@ int qigvm_process_file(IgvmCfg *cfg, ConfidentialGuestSupport *cgs,
     }
 
     QTAILQ_INIT(&ctx.parameter_data);
+    QTAILQ_INIT(&ctx.memory_regions);
 
     for (ctx.current_header_index = 0;
          ctx.current_header_index < (unsigned)header_count;
-- 
2.51.0

> On 15 Oct 2025, at 4:53 PM, Gerd Hoffmann <kraxel@redhat.com> wrote:
> 
> Keep a linked list of the memory regions created by igvm.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

Reviewed-by: Ani Sinha <anisinha@redhat.com>

> ---
> backends/igvm.c | 20 ++++++++++++++------
> 1 file changed, 14 insertions(+), 6 deletions(-)
> 
> diff --git a/backends/igvm.c b/backends/igvm.c
> index ee5ee74c7a66..1690fb334bf5 100644
> --- a/backends/igvm.c
> +++ b/backends/igvm.c
> @@ -28,6 +28,11 @@ typedef struct QIgvmParameterData {
>     uint32_t index;
> } QIgvmParameterData;
> 
> +typedef struct QIgvmMemoryRegion {
> +    QTAILQ_ENTRY(QIgvmMemoryRegion) next;
> +    MemoryRegion mr;
> +} QIgvmMemoryRegion;
> +
> /*
>  * Some directives are specific to particular confidential computing platforms.
>  * Define required types for each of those platforms here.
> @@ -73,6 +78,7 @@ typedef struct QIgvm {
>     uint32_t compatibility_mask;
>     unsigned current_header_index;
>     QTAILQ_HEAD(, QIgvmParameterData) parameter_data;
> +    QTAILQ_HEAD(, QIgvmMemoryRegion) memory_regions;
>     IgvmPlatformType platform_type;
> 
>     /*
> @@ -185,7 +191,7 @@ static void *qigvm_prepare_memory(QIgvm *ctx, uint64_t addr, uint64_t size,
>                                   int region_identifier, Error **errp)
> {
>     ERRP_GUARD();
> -    MemoryRegion *igvm_pages = NULL;
> +    QIgvmMemoryRegion *pages = NULL;
>     Int128 gpa_region_size;
>     MemoryRegionSection mrs =
>         memory_region_find(get_system_memory(), addr, size);
> @@ -219,20 +225,21 @@ static void *qigvm_prepare_memory(QIgvm *ctx, uint64_t addr, uint64_t size,
>          */
>         g_autofree char *region_name =
>             g_strdup_printf("igvm.%X", region_identifier);
> -        igvm_pages = g_new0(MemoryRegion, 1);
> +        pages = g_new0(QIgvmMemoryRegion, 1);
>         if (ctx->cgs && ctx->cgs->require_guest_memfd) {
> -            if (!memory_region_init_ram_guest_memfd(igvm_pages, NULL,
> +            if (!memory_region_init_ram_guest_memfd(&pages->mr, NULL,
>                                                     region_name, size, errp)) {
>                 return NULL;
>             }
>         } else {
> -            if (!memory_region_init_ram(igvm_pages, NULL, region_name, size,
> +            if (!memory_region_init_ram(&pages->mr, NULL, region_name, size,
>                                         errp)) {
>                 return NULL;
>             }
>         }
> -        memory_region_add_subregion(get_system_memory(), addr, igvm_pages);
> -        return memory_region_get_ram_ptr(igvm_pages);
> +        memory_region_add_subregion(get_system_memory(), addr, &pages->mr);
> +        QTAILQ_INSERT_TAIL(&ctx->memory_regions, pages, next);
> +        return memory_region_get_ram_ptr(&pages->mr);
>     }
> }
> 
> @@ -928,6 +935,7 @@ int qigvm_process_file(IgvmCfg *cfg, ConfidentialGuestSupport *cgs,
>     }
> 
>     QTAILQ_INIT(&ctx.parameter_data);
> +    QTAILQ_INIT(&ctx.memory_regions);
> 
>     for (ctx.current_header_index = 0;
>          ctx.current_header_index < (unsigned)header_count;
> -- 
> 2.51.0
>