Fixes aarch64 incorrect cpu model

(cherry picked from commit e2cf0dc3027f86cb51f01a5a3be8aea97f83ecf3)

Fixes-aarch64-incorrect-cpu-model.patch

@@ -0,0 +1,93 @@
+diff --git a/nova/virt/libvirt/driver.py b/nova/virt/libvirt/driver.py
+index f51463f..94d9982 100644
+--- a/nova/virt/libvirt/driver.py
++++ b/nova/virt/libvirt/driver.py
+@@ -789,12 +789,6 @@ class LibvirtDriver(driver.ComputeDriver):
+         cpu = vconfig.LibvirtConfigGuestCPU()
+         for model in models:
+             cpu.model = self._get_cpu_model_mapping(model)
+-            if not cpu.model:
+-                msg = (_("Configured CPU model: %(model)s is not correct, "
+-                         "or your host CPU arch does not suuport this "
+-                         "model. Please correct your config and try "
+-                         "again.") % {'model': model})
+-                raise exception.InvalidCPUInfo(msg)
+             try:
+                 self._compare_cpu(cpu, self._get_cpu_info(), None)
+             except exception.InvalidCPUInfo as e:
+@@ -4323,11 +4317,27 @@ class LibvirtDriver(driver.ComputeDriver):
+         :return: Case-sensitive CPU model name, or None(Only when configured
+                  CPU model name not correct)
+         """
++        cpu_info = self._get_cpu_info()
++        if cpu_info['arch'] not in (fields.Architecture.I686,
++                                    fields.Architecture.X86_64,
++                                    fields.Architecture.PPC64,
++                                    fields.Architecture.PPC64LE,
++                                    fields.Architecture.PPC):
++            return model
++
+         if not self.cpu_models_mapping:
+             cpu_models = self._host.get_cpu_model_names()
+             for cpu_model in cpu_models:
+                 self.cpu_models_mapping[cpu_model.lower()] = cpu_model
+-        return self.cpu_models_mapping.get(model.lower(), None)
++
++        if model.lower() not in self.cpu_models_mapping:
++            msg = (_("Configured CPU model: %(model)s is not correct, "
++                     "or your host CPU arch does not support this "
++                     "model. Please correct your config and try "
++                     "again.") % {'model': model})
++            raise exception.InvalidCPUInfo(msg)
++
++        return self.cpu_models_mapping.get(model.lower())
+ 
+     def _get_guest_cpu_model_config(self, flavor=None):
+         mode = CONF.libvirt.cpu_mode
+@@ -4338,8 +4348,8 @@ class LibvirtDriver(driver.ComputeDriver):
+ 
+         if (CONF.libvirt.virt_type == "kvm" or
+             CONF.libvirt.virt_type == "qemu"):
++            caps = self._host.get_capabilities()
+             if mode is None:
+-                caps = self._host.get_capabilities()
+                 # AArch64 lacks 'host-model' support because neither libvirt
+                 # nor QEMU are able to tell what the host CPU model exactly is.
+                 # And there is no CPU description code for ARM(64) at this
+@@ -4358,6 +4368,12 @@ class LibvirtDriver(driver.ComputeDriver):
+                     mode = "host-model"
+             if mode == "none":
+                 return vconfig.LibvirtConfigGuestCPU()
++            # On AArch64 platform the return of _get_cpu_model_mapping will not
++            # return the default CPU model.
++            if mode == "custom":
++                if arch == fields.Architecture.AARCH64:
++                    if not models:
++                        models = ['max']
+         else:
+             if mode is None or mode == "none":
+                 return None
+@@ -10618,6 +10634,10 @@ class LibvirtDriver(driver.ComputeDriver):
+         else:
+             models = [self._get_cpu_model_mapping(model)
+                       for model in CONF.libvirt.cpu_models]
++            # Aarch64 platform doesn't return the default CPU models
++            if caps.host.cpu.arch == fields.Architecture.AARCH64:
++                if not models:
++                    models = ['max']
+             # For custom mode, iterate through cpu models
+             for model in models:
+                 caps.host.cpu.model = model
+diff --git a/nova/virt/libvirt/utils.py b/nova/virt/libvirt/utils.py
+index 0c04833..5809b1c 100644
+--- a/nova/virt/libvirt/utils.py
++++ b/nova/virt/libvirt/utils.py
+@@ -537,6 +537,8 @@ def get_cpu_model_from_arch(arch):
+         mode = 'qemu32'
+     elif arch == obj_fields.Architecture.PPC64LE:
+         mode = 'POWER8'
++    elif arch == obj_fields.Architecture.AARCH64:
++        mode = 'max'
+     return mode
+ 
+ 

openstack-nova.spec

@@ -15,7 +15,7 @@ Name:             openstack-nova
 # Liberty semver reset
 # https://review.openstack.org/#/q/I6a35fa0dda798fad93b804d00a46af80f08d475c,n,z
 Version:          20.6.1
-Release:          3
+Release:          4
 Summary:          OpenStack Compute (nova)
 
 License:          ASL 2.0
@@ -48,6 +48,7 @@ Source39:         nova_migration_authorized_keys
 Source40:         nova_migration-rootwrap.conf
 Source41:         nova_migration-rootwrap_cold_migration
 
+Patch1:           Fixes-aarch64-incorrect-cpu-model.patch
 BuildArch:        noarch
 
 BuildRequires:    openstack-macros
@@ -730,6 +731,9 @@ exit 0
 %endif
 
 %changelog
+* Mon Nov 29 2021 huangtianhua <huangtianhua@huawei.com> - 20.6.1-4
+- Adds patch to make nova-compute work on aarch64
+
 * Tue Nov 23 2021 zhangy1317 <zhangy1317@foxmail.com> - 20.6.1-3
 - Fix install issue