File 0093-target-ppc-Create-versionless-CPU-c.patch of Package qemu-linux-user.401

Overview Repositories Revisions Requests Users Attributes Meta

File 0093-target-ppc-Create-versionless-CPU-c.patch of Package qemu-linux-user.401

From 6c71fdc38a86514361666e135d25d96a9b2308be Mon Sep 17 00:00:00 2001
From: Alexey Kardashevskiy <aik@ozlabs.ru>
Date: Sat, 12 Apr 2014 03:34:25 +1000
Subject: [PATCH] target-ppc: Create versionless CPU class per family if KVM

At the moment generic version-less CPUs are supported via hardcoded aliases.
For example, POWER7 is an alias for POWER7_v2.1. So when QEMU is started
with -cpu POWER7, the POWER7_v2.1 class instance is created.

This approach works for TCG and KVMs other than HV KVM. HV KVM cannot emulate
PVR value so the guest always sees the real PVR. HV KVM will not allow setting
PVR other that the host PVR because of that (the kernel patch for it is on
its way). So in most cases it is impossible to run QEMU with -cpu POWER7
unless the host PVR is exactly the same as the one from the alias (which
is now POWER7_v2.3). It was decided that under HV KVM QEMU should use
-cpu host.

Using "host" CPU type creates a problem for management tools such as libvirt
because they want to know in advance if the destination guest can possibly
run on the destination. Since the "host" type is really not a type and will
always work with any KVM, there is no way for libvirt to know if the migration
will success.

This registers additional CPU class derived from the host CPU family.
The name for it is taken from @desc field of the CPU family class.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Alexander Graf <agraf@suse.de>
(cherry picked from commit 5b79b1cadd3e565b6d1a5ba59764bd47af58b271)
---
 target-ppc/kvm.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
index 31b2b52..cf2a698 100644
--- a/target-ppc/kvm.c
+++ b/target-ppc/kvm.c
@@ -1788,6 +1788,18 @@ bool kvmppc_has_cap_htab_fd(void)
     return cap_htab_fd;
 }
 
+static PowerPCCPUClass *ppc_cpu_get_family_class(PowerPCCPUClass *pcc)
+{
+    ObjectClass *oc = OBJECT_CLASS(pcc);
+
+    while (oc && !object_class_is_abstract(oc)) {
+        oc = object_class_get_parent(oc);
+    }
+    assert(oc);
+
+    return POWERPC_CPU_CLASS(oc);
+}
+
 static int kvm_ppc_register_host_cpu_type(void)
 {
     TypeInfo type_info = {
@@ -1797,6 +1809,7 @@ static int kvm_ppc_register_host_cpu_type(void)
     };
     uint32_t host_pvr = mfpvr();
     PowerPCCPUClass *pvr_pcc;
+    DeviceClass *dc;
 
     pvr_pcc = ppc_cpu_class_by_pvr(host_pvr);
     if (pvr_pcc == NULL) {
@@ -1807,6 +1820,14 @@ static int kvm_ppc_register_host_cpu_type(void)
     }
     type_info.parent = object_class_get_name(OBJECT_CLASS(pvr_pcc));
     type_register(&type_info);
+
+    /* Register generic family CPU class for a family */
+    pvr_pcc = ppc_cpu_get_family_class(pvr_pcc);
+    dc = DEVICE_CLASS(pvr_pcc);
+    type_info.parent = object_class_get_name(OBJECT_CLASS(pvr_pcc));
+    type_info.name = g_strdup_printf("%s-"TYPE_POWERPC_CPU, dc->desc);
+    type_register(&type_info);
+
     return 0;
 }

Places

File 0093-target-ppc-Create-versionless-CPU-c.patch of Package qemu-linux-user.401

Places