[Xen-devel] [RFC XEN PATCH 08/16] tools/libacpi: expose details of memory allocation callback

[Haozhong Zhang <haozhong.zhang@xxxxxxxxx>]

Expose the minimal allocation unit and the minimal alignment used by the
memory allocator, so that certain ACPI code (e.g. the AML builder added
later) can get contiguous memory allocated by multiple calls to
acpi_ctxt.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>
---
 tools/firmware/hvmloader/util.c | 2 ++
 tools/libacpi/libacpi.h         | 3 +++
 tools/libxl/libxl_x86_acpi.c    | 2 ++
 3 files changed, 7 insertions(+)

diff --git a/tools/firmware/hvmloader/util.c b/tools/firmware/hvmloader/util.c
index 1fe8dcc..504ae6a 100644
--- a/tools/firmware/hvmloader/util.c
+++ b/tools/firmware/hvmloader/util.c
@@ -972,6 +972,8 @@ void hvmloader_acpi_build_tables(struct acpi_config *config,
     ctxt.mem_ops.free = acpi_mem_free;
     ctxt.mem_ops.v2p = acpi_v2p;
     ctxt.mem_ops.p2v = acpi_p2v;
+    ctxt.min_alloc_unit = PAGE_SIZE;
+    ctxt.min_alloc_align = 16;
 
     acpi_build_tables(&ctxt, config);
 
diff --git a/tools/libacpi/libacpi.h b/tools/libacpi/libacpi.h
index 62e90ab..0fb16e7 100644
--- a/tools/libacpi/libacpi.h
+++ b/tools/libacpi/libacpi.h
@@ -47,6 +47,9 @@ struct acpi_ctxt {
         unsigned long (*v2p)(struct acpi_ctxt *ctxt, void *v);
         void *(*p2v)(struct acpi_ctxt *ctxt, unsigned long p);
     } mem_ops;
+
+    uint32_t min_alloc_unit;
+    uint32_t min_alloc_align;
 };
 
 struct acpi_config {
diff --git a/tools/libxl/libxl_x86_acpi.c b/tools/libxl/libxl_x86_acpi.c
index aa5b83d..baf60ac 100644
--- a/tools/libxl/libxl_x86_acpi.c
+++ b/tools/libxl/libxl_x86_acpi.c
@@ -187,6 +187,8 @@ int libxl__dom_load_acpi(libxl__gc *gc,
     libxl_ctxt.c.mem_ops.v2p = virt_to_phys;
     libxl_ctxt.c.mem_ops.p2v = phys_to_virt;
     libxl_ctxt.c.mem_ops.free = acpi_mem_free;
+    libxl_ctxt.c.min_alloc_unit = libxl_ctxt.page_size;
+    libxl_ctxt.c.min_alloc_align = 16;
 
     rc = init_acpi_config(gc, dom, b_info, &config);
     if (rc) {
-- 
2.10.1


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