[Xen-devel] [RFC XEN PATCH v2 07/15] tools/libacpi: expose the minimum alignment used by mem_ops.alloc

[Haozhong Zhang <haozhong.zhang@xxxxxxxxx>]

The AML builder added later requires this information to implement a
memory allocator that can allocate contiguous memory across multiple
calls to mem_ops.alloc().

Signed-off-by: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>

Changes in v2:
 * Only expose the minimal alignment.
 * Rename min_alloc_align to min_alloc_byte_align to clarify the unit.
---
 tools/firmware/hvmloader/util.c | 2 ++
 tools/libacpi/libacpi.h         | 2 ++
 tools/libxl/libxl_x86_acpi.c    | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/tools/firmware/hvmloader/util.c b/tools/firmware/hvmloader/util.c
index 03cfb795d3..d289361317 100644
--- a/tools/firmware/hvmloader/util.c
+++ b/tools/firmware/hvmloader/util.c
@@ -971,6 +971,8 @@ void hvmloader_acpi_build_tables(struct acpi_config *config,
     ctxt.mem_ops.free = acpi_mem_free;
     ctxt.mem_ops.v2p = acpi_v2p;
 
+    ctxt.min_alloc_byte_align = 16;
+
     acpi_build_tables(&ctxt, config);
 
     hvm_param_set(HVM_PARAM_VM_GENERATION_ID_ADDR, config->vm_gid_addr);
diff --git a/tools/libacpi/libacpi.h b/tools/libacpi/libacpi.h
index 67bd67fa0a..2049a1b032 100644
--- a/tools/libacpi/libacpi.h
+++ b/tools/libacpi/libacpi.h
@@ -51,6 +51,8 @@ struct acpi_ctxt {
         void (*free)(struct acpi_ctxt *ctxt, void *v, uint32_t size);
         unsigned long (*v2p)(struct acpi_ctxt *ctxt, void *v);
     } mem_ops;
+
+    uint32_t min_alloc_byte_align; /* minimum alignment used by mem_ops.alloc 
*/
 };
 
 struct acpi_config {
diff --git a/tools/libxl/libxl_x86_acpi.c b/tools/libxl/libxl_x86_acpi.c
index c0a6e321ec..f242450166 100644
--- a/tools/libxl/libxl_x86_acpi.c
+++ b/tools/libxl/libxl_x86_acpi.c
@@ -183,6 +183,8 @@ int libxl__dom_load_acpi(libxl__gc *gc,
     libxl_ctxt.c.mem_ops.v2p = virt_to_phys;
     libxl_ctxt.c.mem_ops.free = acpi_mem_free;
 
+    libxl_ctxt.c.min_alloc_byte_align = 16;
+
     rc = init_acpi_config(gc, dom, b_info, &config);
     if (rc) {
         LOG(ERROR, "init_acpi_config failed (rc=%d)", rc);
-- 
2.12.0


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