target-arm: Use the kernel's idea of MPIDR if we're using KVM

When we're using KVM, the kernel's internal idea of the MPIDR
affinity fields must match the values we tell it for the guest
vcpu cluster configuration in the device tree. Since at the moment
the kernel doesn't support letting userspace tell it the correct
affinity fields to use, we must read the kernel's view and
reflect that back in the device tree.

Signed-off-by: Shlomo Pongratz <shlomo.pongratz@huawei.com>
Signed-off-by: Pavel Fedin <p.fedin@samsung.com>
Message-id: 02f601d0a1e6$90c7d630$b2578290$@samsung.com
[PMM: Use a local #define rather than a global variable for
 the TCG ARM_CPUS_PER_CLUSTER setting. Tweak a comment. Update the
 commit message.]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 17 insertions, 2 deletions

diff --git a/target-arm/psci.c b/target-arm/psci.c
index d8fafab..20e4cb6 100644
--- a/target-arm/psci.c
+++ b/target-arm/psci.c
@@ -72,6 +72,21 @@ bool arm_is_psci_call(ARMCPU *cpu, int excp_type)
     }
 }
 
+static CPUState *get_cpu_by_id(uint64_t id)
+{
+    CPUState *cpu;
+
+    CPU_FOREACH(cpu) {
+        ARMCPU *armcpu = ARM_CPU(cpu);
+
+        if (armcpu->mp_affinity == id) {
+            return cpu;
+        }
+    }
+
+    return NULL;
+}
+
 void arm_handle_psci_call(ARMCPU *cpu)
 {
     /*
@@ -121,7 +136,7 @@ void arm_handle_psci_call(ARMCPU *cpu)
 
         switch (param[2]) {
         case 0:
-            target_cpu_state = qemu_get_cpu(mpidr & 0xff);
+            target_cpu_state = get_cpu_by_id(mpidr);
             if (!target_cpu_state) {
                 ret = QEMU_PSCI_RET_INVALID_PARAMS;
                 break;
@@ -153,7 +168,7 @@ void arm_handle_psci_call(ARMCPU *cpu)
         context_id = param[3];
 
         /* change to the cpu we are powering up */
-        target_cpu_state = qemu_get_cpu(mpidr & 0xff);
+        target_cpu_state = get_cpu_by_id(mpidr);
         if (!target_cpu_state) {
             ret = QEMU_PSCI_RET_INVALID_PARAMS;
             break;