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KVM: PPC: Book3S HV: Manage core host state

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Update the core host state in kvmppc_host_rm_ops whenever
the primary thread of the core enters the guest or returns
back.

Signed-off-by: Suresh Warrier <warrier@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Suresh Warrier 2015-12-17 14:59:07 -06:00 committed by Paul Mackerras
parent 79b6c247e9
commit b8e6a87c82
1 changed files with 44 additions and 0 deletions
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44
arch/powerpc/kvm/book3s_hv.c
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@ -2302,6 +2302,46 @@ static void post_guest_process(struct kvmppc_vcore *vc, bool is_master)
spin_unlock(&vc->lock);
}
/*
* Clear core from the list of active host cores as we are about to
* enter the guest. Only do this if it is the primary thread of the
* core (not if a subcore) that is entering the guest.
*/
static inline void kvmppc_clear_host_core(int cpu)
{
int core;
if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
return;
/*
* Memory barrier can be omitted here as we will do a smp_wmb()
* later in kvmppc_start_thread and we need ensure that state is
* visible to other CPUs only after we enter guest.
*/
core = cpu >> threads_shift;
kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 0;
}
/*
* Advertise this core as an active host core since we exited the guest
* Only need to do this if it is the primary thread of the core that is
* exiting.
*/
static inline void kvmppc_set_host_core(int cpu)
{
int core;
if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
return;
/*
* Memory barrier can be omitted here because we do a spin_unlock
* immediately after this which provides the memory barrier.
*/
core = cpu >> threads_shift;
kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 1;
}
/*
* Run a set of guest threads on a physical core.
* Called with vc->lock held.
@ -2414,6 +2454,8 @@ static noinline void kvmppc_run_core(struct kvmppc_vcore *vc)
}
}
kvmppc_clear_host_core(pcpu);
/* Start all the threads */
active = 0;
for (sub = 0; sub < core_info.n_subcores; ++sub) {
@ -2510,6 +2552,8 @@ static noinline void kvmppc_run_core(struct kvmppc_vcore *vc)
kvmppc_ipi_thread(pcpu + i);
}
kvmppc_set_host_core(pcpu);
spin_unlock(&vc->lock);
/* make sure updates to secondary vcpu structs are visible now */