target-ppc: add PowerPCCPU::cpu_dt_id

Normally CPUState::cpu_index is used to pick the right CPU for various
operations. However default consecutive numbering does not always work
for POWERPC.

These indexes are reflected in /proc/device-tree/cpus/PowerPC,POWER7@XX
and used to call KVM VCPU's ioctls. In order to achieve this,
kvmppc_fixup_cpu() was introduced. Roughly speaking, it multiplies
cpu_index by the number of threads per core.

This approach has disadvantages such as:
1. NUMA configuration stays broken after the fixup;
2. CPU-targeted commands from the QEMU Monitor do not work properly as
CPU indexes have been fixed and there is no clear way for the user to
know what the new CPU indexes are.

This introduces a @cpu_dt_id field in the CPUPPCState struct which
is initialized from @cpu_index by default and can be fixed later
to meet the device tree requirements.

This adds an API to handle @cpu_dt_id.

This removes kvmppc_fixup_cpu() as it is not more needed, @cpu_dt_id
is calculated in ppc_cpu_realize().

This will be used later in machine code.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Acked-by: Mike Day <ncmike@ncultra.org>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 18 insertions, 0 deletions

diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h
index 44ade0c173..afab267485 100644
--- a/target-ppc/cpu.h
+++ b/target-ppc/cpu.h
@@ -2183,4 +2183,22 @@ static inline bool cpu_has_work(CPUState *cpu)
 
 void dump_mmu(FILE *f, fprintf_function cpu_fprintf, CPUPPCState *env);
 
+/**
+ * ppc_get_vcpu_dt_id:
+ * @cs: a PowerPCCPU struct.
+ *
+ * Returns a device-tree ID for a CPU.
+ */
+int ppc_get_vcpu_dt_id(PowerPCCPU *cpu);
+
+/**
+ * ppc_get_vcpu_by_dt_id:
+ * @cpu_dt_id: a device tree id
+ *
+ * Searches for a CPU by @cpu_dt_id.
+ *
+ * Returns: a PowerPCCPU struct
+ */
+PowerPCCPU *ppc_get_vcpu_by_dt_id(int cpu_dt_id);
+
 #endif /* !defined (__CPU_PPC_H__) */