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[Qemu-ppc] [QEMU-PPC] [PATCH 1/2] ppc/spapr: Add implementation of hcall
From: |
Suraj Jitindar Singh |
Subject: |
[Qemu-ppc] [QEMU-PPC] [PATCH 1/2] ppc/spapr: Add implementation of hcall H_PURR |
Date: |
Mon, 24 Jun 2019 15:58:11 +1000 |
The hcall H_PURR is used by a guest to read the PURR (processor
utilisation of resources register). A guest expects that this register
will count at a rate of timebase scaled by the number of guest vcpus
present in the vcore. That is the per vcpu purr will count at a rate of
timebase / # vcpus per vcore.
Implement a handler for the H_PURR hcall and return the purr value
divided by smp_threads so that the sum of the purr deltas across the
vcpus of a vcore equals the timebase delta
Signed-off-by: Suraj Jitindar Singh <address@hidden>
---
hw/ppc/spapr_hcall.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index aae9fd2b3e..88b3343f04 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -1819,6 +1819,27 @@ static target_ulong h_update_dt(PowerPCCPU *cpu,
SpaprMachineState *spapr,
return H_SUCCESS;
}
+static target_ulong h_purr(PowerPCCPU *cpu, SpaprMachineState *spapr,
+ target_ulong opcode, target_ulong *args)
+{
+ CPUPPCState *env = &cpu->env;
+ target_ulong purr;
+
+ if (kvm_enabled()) {
+ cpu_synchronize_state(CPU(cpu));
+ /*
+ * Divide by smp_threads so that the sum of the purr deltas across the
+ * vcpus of a vcore equal the timebase delta.
+ */
+ purr = env->spr[SPR_PURR] / smp_threads;
+ } else {
+ purr = cpu_ppc_load_purr(env);
+ }
+ args[0] = purr;
+
+ return H_SUCCESS;
+}
+
static spapr_hcall_fn papr_hypercall_table[(MAX_HCALL_OPCODE / 4) + 1];
static spapr_hcall_fn kvmppc_hypercall_table[KVMPPC_HCALL_MAX -
KVMPPC_HCALL_BASE + 1];
@@ -1915,6 +1936,9 @@ static void hypercall_register_types(void)
spapr_register_hypercall(H_LOGICAL_DCBF, h_logical_dcbf);
spapr_register_hypercall(KVMPPC_H_LOGICAL_MEMOP, h_logical_memop);
+ /* hcall-purr */
+ spapr_register_hypercall(H_PURR, h_purr);
+
/* qemu/KVM-PPC specific hcalls */
spapr_register_hypercall(KVMPPC_H_RTAS, h_rtas);
--
2.13.6
- [Qemu-ppc] [QEMU-PPC] [PATCH 1/2] ppc/spapr: Add implementation of hcall H_PURR,
Suraj Jitindar Singh <=