diff mbox series

[RFC,V4,16/33] hw/acpi: Make _MAT method optional

Message ID 20241009031815.250096-17-salil.mehta@huawei.com
State Superseded
Headers show
Series None | expand

Commit Message

Salil Mehta Oct. 9, 2024, 3:17 a.m. UTC 
From: Jean-Philippe Brucker <jean-philippe@linaro.org>

The GICC interface on arm64 vCPUs is statically defined in the MADT, and
doesn't require a _MAT entry. Although the GICC is indicated as present
by the MADT entry, it can only be used from vCPU sysregs, which aren't
accessible until hot-add.

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
---
 hw/acpi/cpu.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
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Patch

diff --git a/hw/acpi/cpu.c b/hw/acpi/cpu.c
index 5cb60ca8bc..2d6afcfff7 100644
--- a/hw/acpi/cpu.c
+++ b/hw/acpi/cpu.c
@@ -671,10 +671,13 @@  void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
             aml_append(dev, method);
 
             /* build _MAT object */
-            build_madt_cpu(i, arch_ids, madt_buf, true); /* set enabled flag */
-            aml_append(dev, aml_name_decl("_MAT",
+            if (build_madt_cpu) {
+                build_madt_cpu(i, arch_ids, madt_buf,
+                                true); /* set enabled flag */
+                aml_append(dev, aml_name_decl("_MAT",
                 aml_buffer(madt_buf->len, (uint8_t *)madt_buf->data)));
-            g_array_free(madt_buf, true);
+                g_array_free(madt_buf, true);
+            }
 
             if (CPU(arch_ids->cpus[i].cpu) != first_cpu) {
                 method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);